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Localized Electrons Enhanced Ion Transport for Ultrafast Electrochemical Energy Storage
Author(s) -
Chen Jiewei,
Luo Bi,
Chen Qiushui,
Li Fei,
Guo Yanjiao,
Wu Tom,
Peng Peng,
Qin Xian,
Wu Gaoxiang,
Cui Mengqi,
Liu Lehao,
Chu Lihua,
Jiang Bing,
Li Yingfeng,
Gong Xueqing,
Chai Yang,
Yang Yongping,
Chen Yonghua,
Huang Wei,
Liu Xiaogang,
Li Meicheng
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201905578
Subject(s) - ion , materials science , chemical physics , ionic bonding , electron , electrochemistry , thermal diffusivity , diffusion , ion transporter , electron transport chain , energy storage , electrode , nanotechnology , atomic physics , thermodynamics , chemistry , biochemistry , physics , power (physics) , organic chemistry , quantum mechanics
The rate‐determining process for electrochemical energy storage is largely determined by ion transport occurring in the electrode materials. Apart from decreasing the distance of ion diffusion, the enhancement of ionic mobility is crucial for ion transport. Here, a localized electron enhanced ion transport mechanism to promote ion mobility for ultrafast energy storage is proposed. Theoretical calculations and analysis reveal that highly localized electrons can be induced by intrinsic defects, and the migration barrier of ions can be obviously reduced. Consistently, experiment results reveal that this mechanism leads to an enhancement of Li/Na ion diffusivity by two orders of magnitude. At high mass loading of 10 mg cm −2 and high rate of 10C, a reversible energy storage capacity up to 190 mAh g −1 is achieved, which is ten times greater than achievable by commercial crystals with comparable dimensions.