Flexible interfaces between Si anodes and composite electrolytes consisting of poly(propylene carbonates) (PPCs) and garnets have been fabricated. The solid polymer electrolytes (SPEs) of PPC/garnet/LiTFSI show the conductivity of 4.2 × 10⁻⁴ S cm⁻¹ at room temperature. Their combination with the Si layer anodes allows great alleviation of internal stress resulting from the large volume variation during lithiation and delithiation process of Si anodes. As a result, the Si/SPE/Li cells exhibit 2520 mAh g⁻¹, 2260 mAh g⁻¹, 1902 mAh g⁻¹, 1342 mAh g⁻¹ at 0.1 C, 0.2 C, 0.5 C, and 1 C, respectively. Furthermore, with such compatible and stable interfaces of Si/SPE and the LiFePO₄ cathodes in solid-state batteries, the specific capacity of 2296 mAh g⁻¹ in terms of Si is obtained, which remains 82.6% after 100 cycles at room temperature and 0.1 C. The results here indicate that constructing of flexible interfaces between Si anodes and SPEs is a promising strategy to develop high performance solid-state batteries.

硅阳极与由聚碳酸亚丙酯（PPC）和石榴石组成的复合电解质之间的柔性界面已被制造出来。PPC /石榴石/ LiTFSI的固体聚合物电解质（SPE）在室温下的电导率为4.2×10 ^-4  S cm ^-1。它们与Si层阳极的结合可大大减轻内部应力，该内部应力是由Si阳极的锂化和脱锂过程中的大量体积变化引起的。其结果是，在Si / SPE / Li电池表现出2520毫安克^-1，2260毫安克^-1，1902毫安克^-1，1342毫安克^-1以0.1C，0.2C，0.5C C，并分别1个C， 。此外，具有如此兼容和稳定的Si / SPE和LiFePO接口固态电池中有_4个阴极，获得的单位体积硅为2296 mAh g ^-1，在室温和0.1 C循环100次后仍保持82.6％。结果表明在硅阳极之间构建了柔性界面SPE是开发高性能固态电池的有前途的策略。