金属氢化物在全固态锂离子电池中的应用基础

本项目拟开展金属氢化物在全固态锂离子电池中的应用基础研究。以金属氢化物电极材料和硼氢化物电解质为主要研究对象，利用其高的储锂活性和快的锂离子电导性，构建稳定兼容的电极/固体电解质界面，以期解决全固态锂离子电池中的固/固界面问题。着重研究基于金属氢化物电极材料和电解质的全固态锂离子电池构建，金属氢化物电极在全固态电池中的电化学嵌脱锂行为，金属氢化物电极/硼氢化物电解质的界面特性及其在循环过程中的化学和电化学稳定性，以及充放电过程中氢、锂之间的反应特性和在材料中的传输、扩散特性。在此基础上，揭示金属氢化物的电化学储锂机理和反应动力学机制，优化金属氢化物电极和硼氢化物电解质，发展匹配兼容性良好的新型全固态电池，为研制高能量密度、长寿命和高安全性的新一代锂离子电池奠定基础。

In this proposal, fundamental studies of metal hydrides in all-solid-state Li-ion batteries will be conducted. To solve solid-solid interface problems, this proposal will focus on metal hydride electrode materials with high Li storage activity and borohydride electrolyte materials with fast ion transition, aiming at constructing stable and compatible interface between electrode and solid-state electrolyte. The all-solid-state batteries composed of metal hydride electrodes and electrolytes will be fabricated, and the electrochemical lithiation/delithiation behaviors will be measured. The interface between metal hydride electrodes and borohydride electrolytes and their chemical and electrochemical stability will be studied. Moreover, the reaction of H and Li upon lithiation/delithiation and the corresponding transition and diffusion properties will be characterized. On the basis of above investigations, mechanisms of electrochemical Li storage and reaction kinetics will be understood, and metal hydride electrodes and borohydride electrolytes will be optimized. As a result, new-type all-solid-state batteries with good match and compatibility will be developed. The results will bottom the research of next-generation Li-ion batteries with high energy density, long cycling life and good safety.