期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 5, 页码 6919-6929出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c21838
关键词
lithium ion batteries; anode; Si capsule; polymethyl methacrylate; in situ polymerization
资金
- National Natural Science Foundation of China (NSFC) [21875154, 21875156]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [BK20190829]
A novel Si capsule with in situ developed polymethyl methacrylate (PMMA) shell prepared via microemulsion polymerization shows excellent electrochemical performance and capacity retention at high current densities.
The development of Si-based lithium-ion batteries is restricted by the large volume expansion of Si materials and the unstable solid electrolyte interface film. Herein, a novel Si capsule with in situ developed polymethyl methacrylate (PMMA) shell is prepared via microemulsion polymerization, in which PMMA has high lithium conductivity, high elasticity, certain viscosity in electrolytes, as well as good electrolyte retention ability. Taking advantage of the microcapsule structure with the PMMA capsid, the novel Si capsule anode retains 1.2 mA h/cm(2) at a current density of 2 A/g after 200 electrochemical cycles and delivers higher than 66% of its initial capacity at 42 A/g.
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