电解质
阴极
阳极
溶解
氧化剂
钝化
材料科学
化学工程
碳酸盐
降级(电信)
锂(药物)
无机化学
化学
电极
纳米技术
冶金
电气工程
物理化学
工程类
内分泌学
有机化学
医学
图层(电子)
作者
Seongjae Ko,Xiao Han,Taro Shimada,Norio Takenaka,Yuki Yamada,Atsuo Yamada
出处
期刊:Research Square - Research Square
日期:2022-07-06
被引量:3
标识
DOI:10.21203/rs.3.rs-1759356/v1
摘要
Abstract The Li-ion batteries composed of high-capacity SiO x anode and high-potential LiNi 0.5 Mn 1.5 O 4 cathode is the most realistic options to meet the increasing demands for higher-energy-density storage systems. However, the absence of electrolytes covering the multifaceted issues from highly reducing and oxidizing conditions at the SiO x anode and LiNi 0.5 Mn 1.5 O 4 cathode, respectively, has limited its applications. Herein, we present an electrolyte that can solve these issues simultaneously. A concentrated LiN(SO 2 F) 2 /methyl (2,2,2-trifluoroethyl) carbonate electrolyte upshifts the reaction potentials of the SiO x anode and enables an earlier formation of a robust anion-derived passivation film upon charge to diminish the reductive degradation of the electrolyte. The weak solvating ability of the electrolyte provides a high oxidation tolerance against Al corrosion and transition metal dissolution from the cathode material. Excellent long-term cycling of 5 V-class SiO x |LiNi 0.5 Mn 1.5 O 4 full cells (96% capacity retention after 500 cycles at a low constant current of 0.5 C-rate) was achieved.
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