Boosting fast energy storage by synergistic engineering of carbon and deficiency

Shengjue Deng, He Zhu, Guizhen Wang, Mi Luo, Shenghui Shen, Changzhi Ai, Liang Yang, Shiwei Lin, Qinghua Zhang, Lin Gu (), Bo Liu, Yan Zhang, Qi Liu (), Guoxiang Pan, Qinqin Xiong, Xiuli Wang, Xinhui Xia () and Jiangping Tu
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Shengjue Deng: Zhejiang University
He Zhu: City University of Hong Kong
Guizhen Wang: Hainan University
Mi Luo: Chinese Academy of Sciences
Shenghui Shen: Zhejiang University
Changzhi Ai: Hainan University
Liang Yang: Hainan University
Shiwei Lin: Hainan University
Qinghua Zhang: Chinese Academy of Sciences
Lin Gu: Chinese Academy of Sciences
Bo Liu: Zhejiang University
Yan Zhang: Zhejiang University
Qi Liu: City University of Hong Kong
Guoxiang Pan: Huzhou University
Qinqin Xiong: Hangzhou Dianzi University
Xiuli Wang: Zhejiang University
Xinhui Xia: Zhejiang University
Jiangping Tu: Zhejiang University

Nature Communications, 2020, vol. 11, issue 1, 1-11

Abstract: Abstract Exploring advanced battery materials with fast charging/discharging capability is of great significance to the development of modern electric transportation. Herein we report a powerful synergistic engineering of carbon and deficiency to construct high-quality three/two-dimensional cross-linked Ti2Nb10O29−x@C composites at primary grain level with conformal and thickness-adjustable boundary carbon. Such exquisite boundary architecture is demonstrated to be capable of regulating the mechanical stress and concentration of oxygen deficiency for desired performance. Consequently, significantly improved electronic conductivity and enlarged lithium ion diffusion path, shortened activation process and better structural stability are realized in the designed Ti2Nb10O29−x@C composites. The optimized Ti2Nb10O29−x@C composite electrode shows fast charging/discharging capability with a high capacity of 197 mA h g−1 at 20 C (∼3 min) and excellent long-term durability with 98.7% electron and Li capacity retention over 500 cycles. Most importantly, the greatest applicability of our approach has been demonstrated by various other metal oxides, with tunable morphology, structure and composition.

Date: 2020
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DOI: 10.1038/s41467-019-13945-1

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