摘要：
Tin-based anode materials have emerged as a promising candidate for lithium-ion batteries due to its inexpen-sive cost and high theoretical specific capacity, whereas its potential application is limited by severe capacity attenuation and inferior cycling stability due to the huge volume fluctuation during lithiation/delithiation. Herein, SnO2/Cu@Carbon composite was fabricated to overcome this problem through a facile co-precipitation approach followed by carbon coating. In the as-prepared composite, SnO2 and Cu particles are uniformly embedded in N-doped carbon network matrix. Such unique sandwich-like product can greatly alleviate the large volume expansion and SnO2 aggregation that is conducive to the electron/ion migration, and significantly improve cycling permanence. Therefore, the optimized sample shows impressive long-term stability even at high current density of 1.0 A g-1 (348 mAh g-1 after 1000 loops without obvious capacity decay). Moreover, a comprehensive dynamic analysis of the lithium storage was performed, implying that the increased Li+ diffusion coefficient and pseudocapacitive contribution after cycling may account for the improved electrochemical performances.
摘要：
A thick SiC-Si coating for carbon/carbon (C/C) composites is prepared by one-step pack cementation (PC) process. The microstructure of the coating, the interface structure between the coating and the substrate, and anti-oxidation properties are investigated. As-prepared coating with a thickness of about 774 mu m has a dense and microcrack-free structure. Oxidation test results showed that weight gain of SiC-Si coated specimens is about 8.1 mg.cm(- 2) after oxidation at 1773 K for 338 h, and no failure. By exploring the oxidation resistance of coatings with different thicknesses, it can be found that thickness has a positive effect on coating performance.
通讯机构：
[Jia, Chuankun] C;Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Peoples R China.
关键词：
Zn-based anolytes;catholytes;electrodes;membrane materials;redox flow batteries;large-scale energy storage
摘要：
Zinc-based redox flow batteries (ZRFBs) have been considered as ones of the most promising large-scale energy storage technologies owing to their low cost, high safety, and environmental friendliness. However, their commercial application is still hindered by a few key problems. First, the hydrogen evolution and zinc dendrite formation cause poor cycling life, of which needs to ameliorated or overcome by finding suitable anolytes. Second, the stability and energy density of catholytes are unsatisfactory due to oxidation, corrosion, and low electrolyte concentration. Meanwhile, highly catalytic electrode materials remain to be explored and the ion selectivity and cost efficiency of membrane materials demands further improvement. In this review, we summarize different types of ZRFBs according to their electrolyte environments including ZRFBs using neutral, acidic, and alkaline electrolytes, then highlight the advances of key materials including electrode and membrane materials for ZRFBs, and finally discuss the challenges and perspectives for the future development of high-performance ZRFBs.
摘要：
The Hall-Petch relation predicted strengthening may fail at extremely fine scale, mainly due to the stress-induced dynamic grain growth. In this letter, we report a new strategy of stabilizing grain boundaries by introducing uniformly dispersed graphene into electrodeposited nanocrystalline (NC) Ni. After deformation, the average grain size of graphene-doped NC Ni increases slightly (from 33 nm to 40 nm), while the undoped NC Ni shows a notable increase in grain size (from 35 nm to 51 nm). This discrepancy was attributed to the grain boundary pinning effect from graphene, which in turn activates deformation twinning as a dominate mode for accommodating plastic strains at higher tensile stress level (i.e., 1457 MPa), leading to a 27.6% improvement in strength and a 24.7% enhancement in toughness. The observation of graphene-induced twinning in nano-scaled grains may open a new window for the design of graphene reinforced metallic composites with high strength and toughness.
作者：
Zhiyang Lyu;J. Justin Koh;Gwendolyn J. H. Lim;Danwei Zhang;Ting Xiong;...
期刊：
交叉学科材料,2022年1(4):507-516 ISSN：2767-441X
通讯作者：
Zhiyang Lyu<&wdkj&>Yunfei Chen<&wdkj&>Chaobin He
作者机构：
[Jinlan Wang] School of Physics, Southeast University, Nanjing, China;[Gwendolyn J. H. Lim; Danwei Zhang; Ting Xiong; Lei Zhang; Siqi Liu; Jun Ding; John Wang] Department of Materials Science and Engineering, National University of Singapore, Singapore, Singapore;Agency for Science, Technology, and Research (A*STAR), Institute of Materials Research and Engineering, Singapore, Singapore;[Junfei Duan] School of Materials Science and Engineering, Changsha University of Science and Technology, Changsha, China;[Zhiyang Lyu; Yunfei Chen] Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing, China
通讯机构：
[Zhiyang Lyu; Yunfei Chen] J;[Chaobin He] D;Department of Materials Science and Engineering, National University of Singapore, Singapore, Singapore<&wdkj&>Agency for Science, Technology, and Research (A*STAR), Institute of Materials Research and Engineering, Singapore, Singapore<&wdkj&>Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing, China
摘要：
Three‐dimensional printable polydimethylsiloxane (PDMS)‐based composites with carbon, metal, and ceramic functional fillers are developed. The programmable architectures are designed by printing the PDMS‐based composites and demonstrated to present new practical functionalities of four‐dimensional (4D) printing, including magnetic‐field‐driven 4D‐printed batteries and patchwork with flip motion underwater, as well as arbitrary morphing ceramic architectures. Abstract Polydimethylsiloxane (PDMS) has been widely used in flexible electronics, soft robotics, and bioelectronics. However, the fabrication of PDMS‐based devices has mostly relied on conventional approaches, such as casting and molding, thereby limiting their potential. Here we fabricate PDMS‐based composites with programmable microstructures by direct ink writing and realize their practical functionalities of four‐dimensional (4D) printing. The mechanical, thermomechanical and magnetic properties of the three‐dimensional‐printed composites can be well tailored by using carbon, metal, or ceramic functional fillers. By taking advantage of the printable, flexible, and magnetic PDMS composites, we demonstrate new practical functionalities of 4D printing by designing programmable architectures, including magnetic‐field‐driven battery cases and patchworks, as well as arbitrary morphing ceramic structures. In particular, 4D‐printed batteries are constructed by PDMS‐based battery cases for the first time, which can be actuated via external magnetic field. This study broadens the paradigm of 4D printing for prospective applications, such as implant batteries, biomimetic engineering, and customized biomedical devices.
通讯机构：
[Mei Ding; Jinlong Liu] C;[Xiaoyin Xie] S;School of Chemistry and Chemical Technology, Hubei Polytechnic University, Huangshi 435003, China<&wdkj&>International Joint Research Laboratory of Nano-Micro Architecture Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, China<&wdkj&>College of Materials Science and Engineering, Changsha University of Science & Technology, Changsha 410114, China<&wdkj&>Institute of Energy Storage Technology, Changsha University of Science & Technology, Changsha 410114, China<&wdkj&>College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
作者机构：
[Wen, Shu; Dai, Cuiying; Mao, Weiguo] Xiangtan Univ, Sch Mat Sci & Engn, Hunan 411105, Peoples R China.;[Mao, Weiguo] Changsha Univ & Sci & Technol, Coll Mat Sci & Engn, Hunan 410114, Peoples R China.;[Han, Guofeng; Zhao, Yang; Wang, Xiaoming] Natl Key Lab Remfg, Beijing 100072, Peoples R China.
通讯机构：
[Weiguo Mao] S;[Xiaoming Wang] N;School of Materials Science and Engineering, Xiangtan University, Hunan 411105, China<&wdkj&>College of Materials Science and Engineering, Changsha University & Science and Technology, Hunan 410114, China<&wdkj&>National Key Laboratory for Remanufacturing, Beijing 100072, China
摘要：
The influences of Ag and Co additions on the thermal stability and glass-forming abilities of twenty (Cu46-xZr47Al7Agx)(100)Co--y(y) (x = 0, 1, 2, 3, 4 and y = 0, 0.5, 1, 1.5) alloys were systematically investigated by X-ray diffraction and differential scanning calorimeter techniques. The mechanical performances (i.e., hardness, strength, and plasticity) of the alloys were evaluated, and the plasticization mechanisms of four representative (Cu46-xZr47Al7Agx)(100)Co--y(y) specimens were discussed based on the observations of scanning electron microscopy and high-resolution transmission electron microscopy. It is found that (Cu43Zr47Al7Ag3)(99.5)Co-0.5 bulk metallic glass exhibits excellent thermal stability and improved plasticity after compression tests. The improvement can be attributed to the large amount and density of shear bands, the coexistence of a large area of smooth regions, the vein-like pattern, and the river-like pattern on the fractures. More importantly, the new-formed B2-CuZr phases and nanocrystallines during compressive tests also contribute to the improved plastic deformation ability by exalting the number and density of shear bands. (C) 2022 Published by Elsevier Ltd.
通讯机构：
[Wenbin Luo; Zisheng Chao] S;School of Materials Science and Engineering, Changsha University of Science and Technology, Changsha410114, Hunan, China
关键词：
aluminum organic batteries;organic cathode;cycling stability;rate capability;density functional theory
通讯机构：
[Weiguo Mao] S;[Daming Chen] N;National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150000, China<&wdkj&>Authors to whom correspondence should be addressed.<&wdkj&>School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China<&wdkj&>Authors to whom correspondence should be addressed.<&wdkj&>College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha 410114, China
关键词：
sugar;polyacrylamide;hydrogel;carbon
摘要：
Four kinds of sugar (glucose, fructose, sucrose, and maltose) were selected as carbon precursors, and corresponding dense carbon products were prepared using a novel hydrogel carbonization method. The carbonization processes of sugar-polyacrylamide (sugar-PAM) hydrogels were studied in detail. The molecular structures in the raw materials were analyzed by proton nuclear magnetic resonance spectroscopy ((1)H NMR). Samples prepared at different temperatures were characterized by thermogravimetry analysis (TGA) and Fourier-transform infrared (FTIR) spectroscopy. The morphology and microstructure of sugar-derived carbons were confirmed by field-emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD). The results indicated that the sugar solution was surrounded by PAM with a three-dimensional network structure and formed hydrogels in the initial stage. The sugar solution was considered to be separated into nanocapsules. In each nanocapsule, sugar molecules could be limited within the hydrogel via walls formed by PAM chains. The hydroxyl group in the sugar molecules connected with PAM by the hydrogen bond and intermolecular force, which can strengthen the entire hydrogel system. The self-generated pressure of hydrogel constrains the foam of sugar during the heat treatment. Finally, dense carbon materials with low graphitization instead of porous structure were prepared at 1200 °C.
期刊：
Journal of Alloys and Compounds,2022年929:166931 ISSN：0925-8388
通讯作者：
Yaojun Lin<&wdkj&>Manping Liu
作者机构：
[Lin, Yaojun; Sun, Jiani; Liu, Zhibo] Wuhan Univ Technol, Sch Mat Sci & Engn, Wuhan 430070, Hubei, Peoples R China.;[Yan, Zhigang] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Hebei, Peoples R China.;[Liu, Manping] Jiangsu Univ, Sch Mat Sci & Engn, Zhenjiang 212013, Jiangsu, Peoples R China.;[Liu, Xiaochun] Changsha Univ Sci & Technol, Inst Met, Coll Mat Sci & Engn, Changsha 410114, Hunan, Peoples R China.;[Roven, Hans J.] Norwegian Univ Sci & Technol, Dept Mat Sci & Engn, N-7491 Trondheim, Norway.
通讯机构：
[Yaojun Lin; Manping Liu] S;School of Materials Science and Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China<&wdkj&>School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, Hubei 430070, China
摘要：
Al-Mg alloys with high Mg contents have attracted considerable interest given enhanced strength and si-multaneously reduced density by high Mg solute concentrations. In the present study, we proposed a strategy of strengthening Al-10wt%Mg binary alloy via heavy cryogenic rolling at liquid nitrogen tem-perature. Both cryogenic plastic deformation and a high concentration of Mg solute effectively suppress dynamic recovery during rolling, creating nanoscale and ultra-fine laminated grains containing a high density of dislocations in a nearly single-phase solid solution. The as-rolled Al-10wt%Mg exhibits an average 0.2% offset tensile yield strength of 619 MPa, and average engineering and true ultimate tensile strengths of 689 and 726 MPa, accompanied by average uniform elongation of 5.3% exceeding the threshold value of 5% required for structural engineering applications. The high strength stems from enhanced solid-solution strengthening of a high concentration of Mg solute, significant grain boundary strengthening of nanoscale and ultra-fine laminated grains, and strong dislocation strengthening. The appreciable ductility can be primarily attributed to a high concentration of Mg solute that can retard dynamic recovery processes during tensile testing by impeding dislocation motion, thus enhancing dislocation accumulation and work -hard-ening ability. A high concentration of Mg solute combined with cryogenic plastic deformation to a high strain magnitude provides a new avenue to achieve ultrahigh strength and good ductility in non-age -hardened Al-Mg alloys. (c) 2022 Elsevier B.V. All rights reserved.
期刊：
Journal of Alloys and Compounds,2022年913:165216 ISSN：0925-8388
通讯作者：
Fengrong Li<&wdkj&>Guoqiang Zou
作者机构：
[Aristote, Nkongolo Tshamala; Hou, Hongshuai; Momen, Roya; Deng, Wentao; Gao, Xu; Ji, Xiaobo; Zou, Kangyu; Deng, Xinglan; Zou, Guoqiang] Cent South Univ, Coll Chem & Chem Engn, Changsha 410083, Peoples R China.;[Li, Fengrong] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Peoples R China.
通讯机构：
[Fengrong Li; Guoqiang Zou] C;College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China<&wdkj&>College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha 410114 China
关键词：
Sodium-ion capacitors;Potassium-ion capacitors;Zinc-ion capacitors;Battery-type anode;Capacitor-type cathode;Electrolyte systems
摘要：
In recent years metal ion capacitors (MICs) and supercapacitors devices have been reported as promising alternatives for energy storage on a large scale. MICs are characterized by superior power density and energy density, combining advantages of metal-ion batteries such as lithium-ion batteries, sodium-ion batteries, potassium-ion batteries, zinc-ion batteries, etc., and those of supercapacitors. Herein we provide a review of recent progress on MICs, focusing on the sodium-ion capacitor (SICs), potassium-ion capacitors (PICs), and zinc-ion capacitors (ZICs); starting from the basic concepts (the perspectives of the design concepts, the configuration of MICs devices, the electrochemical behavior and the energy storage mechanism), the electrode materials and electrolyte systems in details with some examples. The factors impacting the electrochemical performances of the MICs are also provided in this work and end with a conclusion. This review will be helpful for researchers, especially the new researchers in the field of MICs and supercapacitors, to have an overall understanding of MICs and supercapacitors, develop electrochemical storage devices, and respond to the need forenergy storage in electric vehicles and electronic devices.(c) 2022 Elsevier B.V. All rights reserved.
通讯机构：
[Wenzhi Huang] S;[Xin Zhou] I;Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, 410073, China<&wdkj&>Institute for Advanced Studies in Precision Materials, Yantai University, Yantai, 264005, China
通讯机构：
[Schulli, TU ] E;[Schulli, TU; Wang, LZ ] U;Univ Queensland, Nanomat Ctr, Sch Chem Engn, Brisbane, Qld 4072, Australia.;Univ Queensland, Australian Inst Bioengn & Nanotechnol, Brisbane, Qld 4072, Australia.;ESRF European Synchrotron, F-38000 Grenoble, France.
摘要：
Transition metal dissolution in cathode active material for Li-based batteries is a critical aspect that limits the cycle life of these devices. Although several approaches have been proposed to tackle this issue, this detrimental process is not yet overcome. Here, benefitting from the knowledge developed in the semiconductor research field, we apply an epitaxial method to construct an atomic wetting layer of LaTMO3 (TM = Ni, Mn) on a LiNi0.5Mn1.5O4 cathode material. Experimental measurements and theoretical analyses confirm a Stranski-Krastanov growth, where the strained wetting layer forms under thermodynamic equilibrium, and it is self-limited to monoatomic thickness due to the competition between the surface energy and the elastic energy. Being atomically thin and crystallographically connected to the spinel host lattices, the LaTMO3 wetting layer offers long-term suppression of the transition metal dissolution from the cathode without impacting its dynamics. As a result, the epitaxially-engineered cathode material enables improved cycling stability (a capacity retention of about 77% after 1000 cycles at 290 mA g(-1)) when tested in combination with a graphitic carbon anode and a LiPF6-based non-aqueous electrolyte solution. Transition metal dissolution from cathode materials limits the cycle life of Li-ion batteries. Here, the authors report an atomic-thin protecting layer on the surface of a high-voltage cathode material, enabling long-term Li-ion battery cycling.
