Abstract:

All-solid-state batteries using solid-state electrolytes instead of organic liquid electrolytes have the advantages of high safety and high energy density, providing a promising solution for next-generation energy storage devices. Although there is a general consensus in the industry on the trend of all-solid-state battery development, the industrialization of all-solid-state batteries is still facing many challenges, such as poor water-oxygen stability of the sulfide electrolytes and the interface between the cathode and the solid-state electrolyte, high interfacial impedance and poor processing performance of oxide electrolytes, as well as low ion conductivity at room temperature and narrow electrochemical windows of polymer electrolytes, which have not been solved yet, restricting the large-scale application of all-solid-state lithium batteries. Through investigation and research, this paper summarized the current status of all-solid-state lithium batteries technology development at home and abroad, analysed and proposed technical difficulties and solutions for all-solid-state lithium batteries, and finally looked forward to the future research directions of all-solid-state lithium batteries.

Key words: all-solid-state battery, solid-state electrolytes, sulfides, oxides, polymer

摘要：

采用固态电解质代替有机电解液的全固态锂电池具有高安全性和高能量密度等优点，有望成为下一代能量存储设备的解决方案之一。虽然行业内对全固态锂电池发展的趋势普遍持有共识，但目前全固态锂电池产业化仍面临很多挑战，如硫化物电解质的水氧稳定性差和阴极与固态电解质界面问题、氧化物电解质的界面阻抗高和加工性能差以及聚合物电解质室温离子电导率低和电化学窗口窄等关键问题尚未解决，制约全固态锂电池的规模化应用。本文通过调查研究，综述了国内外全固态锂电池的技术发展现状，剖析提出了全固态锂电池技术难点和解决方案，最后，对全固态锂电池未来攻关方向进行了展望。

关键词: 全固态锂电池, 固态电解质, 硫化物, 氧化物, 聚合物