材料科学
电解质
阳极
硅
化学工程
聚合物
相间
离子
聚合物电解质
快离子导体
纳米技术
无机化学
离子电导率
电极
复合材料
冶金
有机化学
化学
遗传学
物理化学
工程类
生物
作者
Tianyi Ma,Xiangnan Yu,Xiaolu Cheng,Huiyu Li,Wentao Zhu,Xinping Qiu
标识
DOI:10.1021/acsami.7b03046
摘要
Silicon anodes for lithium-ion batteries are of much interest owing to their extremely high specific capacity but still face some challenges, especially the tremendous volume change which occurs in cycling and further leads to the disintegration of electrode structure and excessive growth of solid electrolyte interphase (SEI). Here, we designed a novel approach to confine the inward growth of SEI by filling solid polymer electrolyte (SPE) into pores of hollow silicon spheres. The as-prepared composite delivers a high specific capacity of more than 2100 mAh g-1 and a long-term cycle stability with a reversible capacity of 1350 mAh g-1 over 500 cycles. The growing behavior of SEI was investigated by electrochemical impedance spectroscopy and differential scanning calorimetry, and the results revealed that SPE occupies the major space of SEI growth and thus confines its excessive growth, which significantly improves cycle performance and Coulombic efficiency of cells embracing hollow silicon spheres.
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