Unprecedented Superhigh‐Rate and Ultrastable Anode for High‐Power Battery via Cationic Disordering
Wei Wu, Mingxian Liu, Yi Pei, Wenjin Li, Wang Lin, Qiyao Huang, Man Wang, Haitao Yang, Libo Deng, Lei Yao, Zijian Zheng
Abstract
Abstract High‐power lithium‐ion batteries (LIBs) are critical for power‐intensive applications; however, their development is largely hindered by the lack of anode materials that have stability and high capacity at high charging/discharging rates. Herein, a cationic disordering strategy is reported to build an ideal high‐power anode with boosted intercalation kinetics and a stable framework. A novel titanium niobate (TiNb 2 O 7 ) anode with unique predistorted Nb(Ti)O 6 octahedrons (pd‐TNO) is developed by introducing cation disorder, which allows ultrafast Li + storage within seconds and exceptional stability over long cycling at high rates. The pd‐TNO delivers an outstanding specific capacity of 153 mAh g −1 at 100 C, 20 times higher than that of conventional TNO anodes without cationic disordering, and retains 42.8% of the capacity after 15,000 cycles. Using the pd‐TNO anode, a high‐power LIB with an unprecedented power density of 91,197 W kg −1 at 200 C, which is approximately eight times higher than that of the advanced commercial high‐power anode Li 4 Ti 5 O 12 (11,813 W kg −1 at 50 C), is demonstrated. Importantly, the pd‐TNO is prepared under ambient conditions via a high‐throughput process, and it exhibits considerable potential for scalability for practical applications.