Herein, a self-supporting comb-like Si-PEG copolymer with flexible Si–O–C bonds in the main chain and pending short PEG chains as the side chain was synthesized to improve the low temperature performance and overcome the quandary between good mechanical and electrochemical properties of the polymer electrolyte in lithium-ion batteries. The tensile strength of Si-PEG polymer electrolytes (SPH15) is 0.8 MPa at 30 °C, which is high enough to inhibit the growth of lithium dendrites. The ion conductivities of Si-PEG (SPH15) are 1.2 × 10⁻⁴ S cm⁻¹ at 30 °C and 3.2 × 10⁻⁵ S cm⁻¹ at 10 °C, which are one order of magnitude higher than those for PEG-based copolymer electrolytes without Si doping. The assembled LiFePO₄/SPH15/Li half batteries can deliver the specific capacities of 84 mA h g⁻¹ at 10 °C and present 75% capacity retention after 500 charge–discharge cycles at 0.5C.

中文翻译：

---

Si掺杂的柔性自支撑梳状聚乙二醇共聚物（Si-PEG）膜作为全固态锂离子电池的聚合物电解质

本文中，合成了一种自支撑的梳状Si-PEG共聚物，该共聚物在主链中具有柔性Si–OC键，在侧链中还有短的PEG短链作为侧链被合成，以改善低温性能并克服了良好的机械性能和机械性能之间的难题锂离子电池中聚合物电解质的电化学性能。Si-PEG聚合物电解质（SPH15）在30°C时的拉伸强度为0.8 MPa，该强度足以抑制锂树枝状晶体的生长。Si-PEG（SPH15）的离子电导率在30°C下为1.2×10 ^-4 S cm ^-1，在10°C下为3.2×10 ^-5 S cm ^-1，比PEG高1个数量级。硅掺杂的硅基共聚物电解质。组装好的LiFePO ₄/ SPH15 / Li半电池在10°C时可提供84 mA hg ^-1的比容量，在0.5C下经过500次充放电循环后，仍可保留75％的容量。