Localized Electrons Enhanced Ion Transport for Ultrafast Electrochemical Energy Storage

Jiewei Chen; Bi Luo; Qiushui Chen; Fei Li; Yanjiao Guo; Tom Wu; Peng Peng; Xian Qin; Gaoxiang Wu; Mengqi Cui; Lehao Liu; Lihua Chu; Bing Jiang; Yingfeng Li; Xueqing Gong; Yang Chai; Yongping Yang; Yonghua Chen; Wei Huang; Xiaogang Liu; Meicheng Li

doi:10.1002/adma.201905578

Localized Electrons Enhanced Ion Transport for Ultrafast Electrochemical Energy Storage

Adv Mater. 2020 Apr;32(14):e1905578. doi: 10.1002/adma.201905578. Epub 2020 Feb 26.

Authors

Jiewei Chen¹, Bi Luo¹, Qiushui Chen², Fei Li³, Yanjiao Guo¹, Tom Wu⁴, Peng Peng¹, Xian Qin², Gaoxiang Wu¹, Mengqi Cui¹, Lehao Liu¹, Lihua Chu¹, Bing Jiang¹, Yingfeng Li¹, Xueqing Gong³, Yang Chai⁵, Yongping Yang¹, Yonghua Chen⁶, Wei Huang^{6

7}, Xiaogang Liu², Meicheng Li¹

Affiliations

¹ State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing, 102206, China.
² Department of Chemistry, National University of Singapore, Singapore, 117543, Singapore.
³ Key Laboratory for Advanced Materials, Centre for Computational Chemistry and Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237, China.
⁴ School of Materials Science and Engineering, University of New South Wales, Sydney, NSW, 2052, Australia.
⁵ Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, 999077, China.
⁶ Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University, Nanjing, 210028, China.
⁷ Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University (NPU), Xi'an, 710072, China.

PMID: 32101356
DOI: 10.1002/adma.201905578

Abstract

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.

Keywords: electrochemical energy storage; high loading mass; ion transport; lithium-ion batteries; sodium-ion batteries.

Abstract

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