Novel Three-Dimensional Skeleton Structure Li-B Alloys as Anode for Solid-State Lithium Batteries

Abstract

In the development of lithium ion batteries (LIBs) with higher energy density and safety, solid-state lithium batteries (SSLBs) have attracted widespread attention. However, even in SSLBs, when metallic lithium is used as the anode, lithium dendrites can still form during the lithium-ion deintercalation process, leading to poor cycling performance of the battery. Herein, lithium-boride (Li-B) alloy with a layered three-dimensional skeleton structure was synthesized and investigated as anode for SSLBs. Due to the stability of the special three-dimensional skeleton structure, the deintercalation of lithium ions does not cause the collapse of the material structure. Thus, compared to the metallic lithium anode, the Li-B alloy exhibits higher discharge specific capacity and better cycling performance (when using the as-prepared lithium-rich manganese-based (Li_1.2Ni_0.2Mn_0.6O₂) as the cathode material, the initial discharge capacity of the SSLBs is 209 mAh g^–1, and when using LiFePO₄ as the cathode material, the initial discharge capacity is 192 mAh g^–1, with a capacity retention rate of 82% after 50 cycles).