电解质
阴极
电化学
氧化物
化学
图层(电子)
无机化学
化学工程
分析化学(期刊)
电极
物理化学
环境化学
工程类
有机化学
作者
Tao Huang,Xinwei Zheng,Chunfeng Yan,Ying Pan,Maoxiang Wu
标识
DOI:10.1016/j.jpowsour.2023.233437
摘要
1,3-Divinyltetramethyldisiloxane (DTMS) is a multifunctional additive that is used to improves the cycling stability and capacity retention of Li-rich Mn-based layered oxide cathodes (LRMs). Cycling performance evaluations demonstrate that LRM/Li cells without the additive exhibit lower capacity retention. DTMS can significantly improve the capacity retention of LRM/Li cells from 42.8% to 75% at 0.5C. Theoretical calculations indicate that DTMS is preferentially oxidized on the LRM surface. Physical characterization results reveal that DTMS generates a layer on the LRM surface that is both less resistive and thinner than the LRM by reacting with HF/F− from the electrolyte. This DTMS-derived layer inhibits adverse reactions between the cathode and electrolyte, thus, effectively maintaining the cathode structure.
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