阳极
硅
电解质
材料科学
硼
锂(药物)
化学工程
电化学
石墨
电极
化学
复合材料
冶金
有机化学
医学
物理化学
工程类
内分泌学
作者
Jianbin Li,Xianchao Hu,Hongshun Zhao,Yurong Ren,Xiaobing Huang
出处
期刊:Langmuir
[American Chemical Society]
日期:2021-12-29
卷期号:38 (1): 402-410
被引量:9
标识
DOI:10.1021/acs.langmuir.1c02751
摘要
Silicon is considered one of the most promising next-generation anode materials for lithium-ion batteries. It has the advantages of high theoretical specific capacity (4200 mAh·g-1), which is 10 times larger than that of a commercial graphite anode (372 mAh·g-1). However, there are some problems such as the pulverization of the electrode and an unstable solid electrolyte interphase (SEI) layer aroused by the huge bulk effect (>300%) of Si during the repeated lithiation/delithiation process. A binder plays a vital role in the conventional lithium-ion batteries that can effectively relieve the bulk expansion stress of a silicon anode. In this work, the inorganic cross-linker sodium borate (SB) and the commonly used binder sodium alginate (SA) were condensed through an esterification reaction and the reaction product was marked as SA-SB. It is found that the mechanical robustness and the peel strength of SA-SB are improved after cross-linking, which is conducive to maintaining the structural stability of the silicon anode in long cycle life. In consequence, the capacity retention of the silicon anode using the SA-SB binder (64.1%) is higher than that of SA (50.6%) after 100 cycles at 0.2 A·g-1.
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