期刊
SMALL
卷 17, 期 49, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202103878
关键词
conductivity; secondary particle; SiO; (2) anode; structural stability; yarn-ball structure
类别
资金
- Ningxia Key Research and Development Project [2020BDE03011]
- Technology Leading Talent Program of Ningxia Province [KJT2016003]
- National Science Foundation of China [51462029]
A unique carbon yarn-ball structure entangling nanoscale SiO2 together has been successfully synthesized, providing significant performance improvements for lithium-ion batteries.
Various nanoscale SiO2 and their composites have demonstrated superior electrochemical performance as anodes for lithium-ion batteries. However, both the battery production and real applications require the integration of nanoscale SiO2 into micrometer-sized secondary particles while preserving their excellent stability and conductivity, which remains a great challenge. In this work, a unique carbon yarn-ball structure is successfully synthesized that entangles nanoscale SiO2 together to build a micrometer-sized secondary particle. The hook-like carbon wires closely adhere to individual SiO2 nanoparticles, which constitute the basic unit of the yarn-ball structure. The entangled carbon wires create a network of electron conduction highways for SiO2, and the yarn-ball structure provides a resilient 3D matrix that can effectively buffer the anisotropic volume changes of SiO2 during Li ion insertion/extraction. Under 0.1 A g(-1), the carbon yarn-ball-entangled SiO2 can deliver a 1297 mAh g(-1) discharge capacity with a small irreversible capacity of 82 mAh g(-1). The entangled carbon yarn ball firmly maintains its structural integrity during high-rate cycling (1 A g(-1)), which gives rise to a large accessible capacity (709 mAh g(-1), 90.7% retention for 500 cycles), superior coulombic efficiency (>99.9%), and excellent structural stability.
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