To improve the cycling performance of graphite anode materials, we propose a functional electrolyte additive, trimethoxymethylsilane (TMSi), which contains a silyl ether functional group as part of its molecular structure. First principal calculation studies, in addition to ex situ analyses, demonstrated that electrochemical reduction of ethylene carbonate (EC) gives an anionic reduced EC product. Subsequent chemical reaction with TMSi then generates solid-electrolyte interphase (SEI) layers of Si–O and Si–C functionalized carbonate on the surface of the graphite anode, which prolongs and stabilizes the cycling performance of the cells. As a result, the cell cycled with TMSi-controlled electrolyte exhibits a cycling retention of 89.5%, whereas the cell cycled with standard electrolyte suffers from poor cycling retention (84.3%) after 100 cycles.

为了提高石墨负极材料的循环性能，我们提出了功能性电解质添加剂三甲氧基甲基硅烷（TMSi），该添加剂包含甲硅烷基醚官能团作为其分子结构的一部分。除异位分析外，第一项主要计算研究表明，碳酸亚乙酯（EC）的电化学还原可得到阴离子还原的EC产物。随后与TMSi发生化学反应，在石墨阳极表面上生成Si-O和Si-C官能化碳酸盐的固体电解质中间相（SEI）层，从而延长并稳定了电池的循环性能。结果，用TMSi控制的电解质循环的电池表现出89.5％的循环保持率，而用标准电解质循环的电池在100次循环后具有较差的循环保持率（84.3％）。