CoWO4 nanopaticles wrapped by RGO as high capacity anode material for lithium ion batteries

• Published in: Rare metals 2017-05, Vol.36 (5), p.411-417
• Main Authors: Yu, Peng, Wang, Lei, Liu, Xu, Fu, Hong-Gang, Yu, Hai-Tao
• Format: Article
• Language: English
• Subjects: Anodes; Biomaterials; Chemistry and Materials Science; Electrode materials; Energy; Lithium-ion batteries; Materials Engineering; Materials Science; Metallic Materials; Nanocomposites; Nanoscale Science and Technology; Physical Chemistry; Rechargeable batteries; Transition metal oxides; 包裹; 纳米复合材料; 纳米粒子; 蓝色发光二极管; 负极材料; 过渡金属氧化物; 锂离子电池; 高容量
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-017-0889-6

Transition-metal oxides have attracted increased attention in the application of high-performance lithium ion batteries（LIBs）, owing to its higher reversible capacity,better structural stability and high electronic conductivity.Herein, CoWO4 nanoparticles wrapped by reduced graphene oxide（CoWO4–RGO） were synthesized via a facile hydrothermal route followed by a subsequent heat-treatment process. When evaluated as the anode of LIB, the synthetic CoWO4–RGO nanocomposite exhibits better Li^＋ storage properties than pure CoWO4 nanostructures synthesized without graphene oxide（GO）. Specifically, it delivers a high initial specific discharge capacity of1100 mAh·g^-1 at a current density of 100 mA·g^-1, and a good reversible performance of 567 mAh·g^-1 remains after the 100th cycle. Moreover, full battery using CoWO4–RGO as anode and commercial LiCoO2 powder as cathode was assembled, which can be sufficient to turn on a 3 V,10 mW blue light emitting diode（LED）. The enhanced electrochemical performance for lithium storage can be attributed to the three-dimensional（3D） structure of the CoWO4–RGO nanocomposite, which can accommodate huge volume changes, and synergetic effect between CoWO4 and reduced graphite oxide（RGO） nanosheets,including an increased conductivity, shortened Li^＋ diffusion path.