Implanting Transition Metal into Li<sub>2</sub>O‐Based Cathode Prelithiation Agent for High‐Energy‐Density and Long‐Life Li‐Ion Batteries
Yilong Chen, Yuanlong Zhu, Wenhua Zuo, Xiaoxiao Kuai, Xiaoxiao Kuai, Junyi Yao, Baodan Zhang, Zhefei Sun, Jianhua Yin, Xiaohong Wu, Haitang Zhang, Yawen Yan, Huan Huang, Lirong Zheng, Juping Xu, Wen Yin, Yongfu Qiu, Qiaobao Zhang, Inhui Hwang, Cheng‐Jun Sun, Khalil Amine, Gui‐Liang Xu, Gui‐Liang Xu, Yu Qiao, Shi‐Gang Sun
Abstract
Abstract Compensating the irreversible loss of limited active lithium (Li) is essentially important for improving the energy‐density and cycle‐life of practical Li‐ion battery full‐cell, especially after employing high‐capacity but low initial coulombic efficiency anode candidates. Introducing prelithiation agent can provide additional Li source for such compensation. Herein, we precisely implant trace Co (extracted from transition metal oxide) into the Li site of Li 2 O, obtaining (Li 0.66 Co 0.11 □ 0.23 ) 2 O (CLO) cathode prelithiation agent. The synergistic formation of Li vacancies and Co‐derived catalysis efficiently enhance the inherent conductivity and weaken the Li−O interaction of Li 2 O, which facilitates its anionic oxidation to peroxo/superoxo species and gaseous O 2 , achieving 1642.7 mAh/g ~Li2O prelithiation capacity (≈980 mAh/g for prelithiation agent). Coupled 6.5 wt % CLO‐based prelithiation agent with LiCoO 2 cathode, substantial additional Li source stored within CLO is efficiently released to compensate the Li consumption on the SiO/C anode, achieving 270 Wh/kg pouch‐type full‐cell with 92 % capacity retention after 1000 cycles.