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首页> 外文期刊>ACS applied materials & interfaces >A New Strategy to Stabilize Capacity and Insight into the Interface Behavior in Electrochemical Reaction of LiNi0.5Mn1.5O4/Graphite System for High-Voltage Lithium-Ion Batteries
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A New Strategy to Stabilize Capacity and Insight into the Interface Behavior in Electrochemical Reaction of LiNi0.5Mn1.5O4/Graphite System for High-Voltage Lithium-Ion Batteries

机译：一种新的策略，以稳定对高压锂离子电池的LINI0.5MN1.5O4 /石墨系统电化学反应中的界面行为的能力和见解

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摘要

The performance of CEI and SEI configuration and formation mechanism on the cathode and anode side for LiNi0.5Mn1.5O4/natural graphite (LNMO/NG) batteries is investigated, where series permutations of the NG electrodes modified with TEOS species as the anode for the LNMO full cells. It is believed that the excellent long-term cycling performance of LNMO/NG full cells at the high voltage is a result of alleviating the devastated reaction to form the CEI and SEI on the both electrodes with electrolyte, respectively. At a voltage range from 3.4 to 4.8 V for the LNMO full cells, 95.0% capacity retention after 100 cycles is achieved when cycled with TEOS-modifying NG anode. This mechanism may be explained that eliminating the HF and absorbing water impurities in the electrolyte by introducing the TEOS group, which can transform the SiO2 species that react with the acid of HF at the organic solvent environment instead of destroying/forming the anode SEI and attacking the LNMO spinel structure to form the dense and high resistance CEI, meanwhile the SiO2 species will absorb the water molecule and precipitate into the anode surface further stabilizing the SEI configuration during the cycling.
机译：研究了CEI和SEI配置和形成机制的LINI0.5MN1.5O4 /天然石墨（LNMO / NG）电池的阴极和阳极侧的性能，其中NG电极的系列排列用TEOS物种作为阳极改性lnmo全细胞。据信，在高压下LNMO / NG全细胞的优异长期循环性能是缓解破坏性反应，以分别在两个电极上形成CEI和SEI。对于LNMO全细胞的3.4至4.8V的电压范围为3.4至4.8V，在用TEOS改性NG阳极循环时，可以在100次循环后进行95.0％的容量保留。可以解释该机制，通过引入TEOS基团消除电解质中的HF和吸收水杂质，这可以转化在有机溶剂环境中与HF酸反应的SiO2物种而不是破坏/形成阳极SEI和攻击LNMO尖晶石结构形成致密和高抗性CEI，同时SiO2物种将吸收水分子并沉淀到阳极表面中，进一步稳定在循环期间SEI构型。

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