The stability of electrolyte in Lithium-ion batteries (LIBs) is strongly influenced by its internal molecular structure, which can be affected by the electronegativity of electron groups. During the charging process of the NCM811 cathode electrode, electron-deficient transition metal ions in the cathode tend to extract electrons from the surrounding electrolyte solvent, weakening its structural stability and leading to oxidative degradation. To address this issue, a novel approach involving the formation a polymer coating layer (PCL) on the NCM811 cathode through in-situ self-polymerization of Tetravinylsilane (TVSi) to enhance LIB performance and stability. The electron-withdrawing effect and the presence of the C=C bond in TVSi help stabilize the cathode-electrolyte interface and inhibit oxidative degradation. The PCL increases the electrolyte's onset oxidation potential to 5.02 V. The resulting NCM811 batteries exhibit an improved discharge capacity retention of 80% at 1C over 140 cycles. This study presents an innovative approach for improving the stability and performance of LIBs by utilizing TVSi, characterized by its electron-withdrawing effect and C=C bond as a PCL on the NCM811 cathode material.

中文翻译：

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用于高性能锂离子电池的 NCM811 接口上吸电子聚合物涂层的原位构建


锂离子电池 （LIB） 中电解质的稳定性受其内部分子结构的强烈影响，而其内部分子结构会受到电子基团电负性的影响。在 NCM811 正极电极的充电过程中，阴极中缺电子的过渡金属离子往往会从周围的电解质溶剂中提取电子，削弱其结构稳定性并导致氧化降解。为了解决这个问题，一种新方法涉及通过四乙烯基硅烷 （TVSi） 的原位自聚合在 NCM811 阴极上形成聚合物涂层 （PCL），以增强 LIB 性能和稳定性。TVSi 中的吸电子效应和 C=C 键的存在有助于稳定阴极-电解质界面并抑制氧化降解。PCL 将电解液的起始氧化电位增加到 5.02 V。所得的 NCM811 电池在 1C 下在 140 次循环中表现出 80% 的放电容量保持率。本研究提出了一种利用 TVSi 提高 LIBS 稳定性和性能的创新方法，其特征是其吸电子效应和 C=C 键作为 NCM811 正极材料上的 PCL。