Latticed‐Confined Conversion Chemistry of Battery Electrode
Libin Fang, Haosheng Li, Ben Bin Xu, Jie Ma, Hongge Pan, Qinggang He, Tianlong Zheng, Wenbin Ni, Yue Lin, Yangmu Li, Yue Cao, Cheng‐Jun Sun, Mi Yan, Wenping Sun, Yinzhu Jiang
Abstract
The electrochemical conversion reaction, usually featured by multiple redox processes and high specific capacity, holds great promise in developing high-energy rechargeable battery technologies. However, the complete structural change accompanied by spontaneous atomic migration and volume variation during the charge/discharge cycle leads to electrode disintegration and performance degradation, therefore severely restricting the application of conventional conversion-type electrodes. Herein, latticed-confined conversion chemistry is proposed, where the "intercalation-like" redox behavior is realized on the electrode with a "conversion-like" high capacity. By delicately formulating the high-entropy compounds, the pristine crystal structure can be preserved by the inert lattice framework, thus enabling an ultra-high initial Coulombic efficiency of 92.5% and a long cycling lifespan over a thousand cycles after the quasistatic charge-discharge cycle. This lattice-confined conversion chemistry unfolds a ubiquitous insight into the localized redox reaction and sheds light on developing high-performance electrodes toward next-generation high-energy rechargeable batteries.