In Situ Defect Engineering in Carbon by Atomic Self‐Activation to Boost the Accessible Low‐Voltage Insertion for Advanced Potassium‐Ion Full‐Cells

Author:

Xiong Jianzhen1,Yang Zecheng1,Zhou Rui2,Xiao Anyong1,Kong Xiangkai1,Jiang Jiangmin1,Dong Liang3,Zhuang Quanchao1,Ju Zhicheng1,Chen Yaxin1ORCID

Affiliation:

1. School of Materials Science and Physics China University of Mining and Technology Xuzhou 221116 China

2. Advanced Analysis & Computation Center China University of Mining and Technology Xuzhou 221116 China

3. School of Chemical Engineering and Technology China University of Mining and Technology Xuzhou 221116 China

Abstract

AbstractEnhancing the low‐potential capacity of anode materials is significant in boosting the operating voltage of full‐cells and constructing high energy‐density energy storage devices. Graphitic carbons exhibit outstanding low‐potential potassium storage performance, but show a low K+ diffusion kinetics. Herein, in situ defect engineering in graphitic nanocarbon is achieved by an atomic self‐activation strategy to boost the accessible low‐voltage insertion. Graphitic carbon layers grow on nanoscale‐nickel to form the graphitic nanosphere with short‐range ordered microcrystalline due to nickel graphitization catalyst. Meanwhile, the widely distributed K+ in the precursor induces the activation of surrounding carbon atoms to in situ generate carbon vacancies as channels. The graphite microcrystals with defect channels realize reversible K+ intercalation at low‐potential and accessible ion diffusion kinetics, contributing to high reversible capacity (209 mAh g−1 at 0.05 A g−1 under 0.8 V) and rate capacity (103.2 mAh g−1 at 1 A g−1). The full‐cell with Prussian blue cathode and graphitic nanocarbon anode maintains an obvious working platform at ca. 3.0 V. This work provides a strategy for the in situ design of carbon anode materials and gives insights into the potassium storage mechanism at low‐potential for high‐performance full‐cells.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Jiangsu Province

Publisher

Wiley

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