Due to the large volume expansion, the multiple issue of severe pulverized Si particles, irreversible damaged electrode structure, and incompatible solid electrolyte interphase (SEI), have greatly restricted the practical application of Si-based anodes. Herein, a neutral partially lithiated binder (PVA-g-LiPAA) is successfully synthesized and applied in high-loaded SiO||Li, 200 mA h and 4 A h SiO/graphite||LiCoO pouch cells. The rich netural -OH and -COOLi groups show strong interaction with the Si particles during long-term cycling processes. Neutral PVA-g-LiPAA binder can induce the formation of a homogenous and stable “core-shell” SEI film on the SiO anodes, forbidding the structural evolution and volume expansion. This -CF-rich SEI film can also improve the ionic conductivity and accelerate the electrochemical kinetics reaction. Moreover, the integrity of fluid collection and polar ears can also be protected. Thus, the manufactured 4 A h SiO/graphite||LiCoO full pouch cell maintains a high 700th discharge capacity of 3.13 A h with capacity retention of 81.3% under 25 °C and 3 C, as well as 300th discharge capacity of 2.73 A h with capacity retention of 98.6% even under 0°C and 1.5 C. This work proves the industrical applications of Si-based anodes over a wide temperature range with high energy density and long cycle life.

中文翻译：

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面向工业应用：通过锂化聚合物粘合剂在-25°C至25°C的宽温度范围内传导的超稳定硅基软包电池

由于体积膨胀大、硅颗粒严重粉化、电极结构不可逆破坏、固体电解质界面不相容等多重问题，极大地限制了硅基负极的实际应用。在此，成功合成了中性部分锂化粘合剂（PVA-g-LiPAA）并将其应用于高负载SiO||Li、200mAh和4AhSiO/石墨||LiCoO软包电池中。丰富的中性-OH和-COOLi基团在长期循环过程中与Si颗粒表现出强烈的相互作用。中性PVA-g-LiPAA粘合剂可以诱导在SiO阳极上形成均匀且稳定的“核壳”SEI膜，阻止结构演化和体积膨胀。这种富含-CF的SEI膜还可以提高离子电导率并加速电化学动力学反应。此外，还可以保护液体收集和极耳的完整性。因此，制造的4 A h SiO/石墨||LiCoO全软包电池在25°C和3 C下保持了3.13 A h的高第700次放电容量，容量保持率为81.3%，以及2.73 A h的第300次放电容量即使在0°C和1.5 C下容量保持率仍高达98.6%。这项工作证明了硅基负极在宽温度范围内具有高能量密度和长循环寿命的工业应用。