Hollow tremella-like graphene sphere/SnO2 composite for high performance Li-ion battery anodes |
| |
| Affiliation: | 1. School of Materials Science and Engineering, North University of China, Taiyuan 030051, PR China;2. Shanxi Province Key Laboratory of Functional Nanocomposites, North University of China, Taiyuan 030051, PR China;3. Nanotechnology Department, Helmholtz Association, 21502 Hamburg, Germany;1. Program Studi Ilmu Lingkungan, Program Pascasarjana, Universitas Sriwijaya, Palembang 30139, Sumatera Selatan, Indonesia;2. Material Science and Engineering Department, Worcester Polytechnic Institute, Worcester, MA 01609, United States;3. Program Studi Teknik Kimia, Fakultas Teknik, Universitas Sriwijaya, Indralaya 30662, Sumatera Selatan, Indonesia;1. School of Materials Science and Engineering, Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, South China University of Technology, Guangzhou, 510641, PR China;2. China-Australia Joint Laboratory for Energy & Environmental Materials, South China University of Technology, Guangzhou, 510641, PR China;3. Department of Chemistry, University of Venda, Private Bag X5050, Thohoyandou, 0950, South Africa;4. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510641, PR China;1. School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China;2. School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China;3. College of Chemistry Engineering and Materials Science, Quanzhou Normal University, Quanzhou 362000, China;4. School of Mechanical Engineering, Dongguan University of Technology, Dongguan 523808, China |
| |
| Abstract: | A hollow tremella-like graphene sphere/tin dioxide (HTGS/SnO2) composite was successfully prepared by simple emulsification and impregnation followed by calcination. In this material, tin dioxide adheres to the folds on the surface of the hollow tremella-like graphene spheres. Hollow tremella-like graphene spheres as the matrix of SnO2 not only provide a space of volumetric expansion for the tin oxide particles, relieve the internal stress of the tin dioxide, but also effectively avoid aggregation of the tin dioxide and increase the electrical conductivity. As an anode electrode material for batteries, the initial discharge/charge capacities of HTGS/SnO2 are 1762.4 mAh g-1 and 1169.4 mAh g-1, and the Coulomb efficiency is 96.9%. After 50 cycles, capacity remains 80.4% of reversible capacity. The excellent electrochemical stability is attributed to the extraordinary structure of HTGS/SnO2. The hollow structure of graphene sphere allows simultaneous insertion of lithium ions from the inner and outer surfaces. Meanwhile, the tin dioxide particles are uniformly dispersed by the wrinkles on the surface of the graphene, thereby enlarging the space for the volume expansion of tin dioxide in order to avoid contact with the electrolyte. |
| |
| Keywords: | Energy storage materials Electrode materials Lithium-ion battery Oxide materials Hollow graphene sphere |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
