Tetrahedral Lithium Stuffing in Disordered Rocksalt Cathodes for High-Power-Density and Energy-Density Batteries
Yu Mei, Yujin Li, Haoji Wang, Jinqiang Gao, Lianshan Ni, Debbie S. Silvester, Craig E. Banks, Wentao Deng, Baishan Chen, Guoqiang Zou, Hongshuai Hou, Tongchao Liu, Xiaobo Ji, Chaoping Liang, Khalil Amine
Abstract
Li-rich cation-disordered rocksalt (DRX) materials introduce new paradigms in the design of high-capacity Li-ion battery cathode materials. However, DRX materials show strikingly sluggish kinetics due to random Li percolation with poor rate performance. Here, we demonstrate that Li stuffing into the tetrahedral sites of the Mn-based rocksalt skeleton injects a novel tetrahedron-octahedron-tetrahedron diffusion path, which acts as a low-energy-barrier hub to facilitate high-speed Li transport. Moreover, the enhanced stability of lattice oxygen and the suppression of transition metal migration preserve the efficacy of the Li percolation network during cycling. Overall, the tetrahedral Li stuffing DRX material exhibits high energy density (311 mAh g –1, 923 Wh kg –1 ) and high power density (251 mAh g –1, 697 Wh kg –1 at 1000 mA g –1 ). Our results highlight the potential to develop high-performance and earth-abundant cathode materials within the extensive range of rocksalt compounds.