首页|Interfacial/bulk synergetic effects accelerating charge transferring for advanced lithium-ion capacitors

Interfacial/bulk synergetic effects accelerating charge transferring for advanced lithium-ion capacitors

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The exploration of advanced materials through rational structure/phase design is the key to develop high-performance lithium-ion capacitors(LICs).However,high complexity of material preparation and diffi-culty in quantity production largely hinder the further development.Herein,Cu5FeS4-x/C(CFS@C)hetero-junction with rich sulfur vacancies has successfully achieved from natural bornite,presenting low cost-effective and bulk-production prospect.Density functional theory(DFT)calculations indicate that rich vacancies in bulk phase can decrease band gap of bornite and thus improve its intrinsic electron conduc-tivity,as well as the heterojunction spontaneously evokes a built-in electric field between its interfacial region,largely reducing the migration barrier from 1.27 eV to 0.75 eV.Benefited from these merits,the CFS@C electrodes deliver outperformed lithium storage performance,e.g.,high reversible capacity(822.4 mAh/g at 0.1 A/g),excellent cycling stability(up to 820 cycles at 2 A/g and 540 cycles at 5 A/g with re-spective capacity retention of over or nearly 100％).With CFS@C as anode and porous carbon nanosheets(PCS)as cathode,the assembled CFS@C//PCS LIC full cells exhibit high energy/power density characteris-tics of 139.2 Wh/kg at 2500 W/kg.This work is expected to offer significant insights into structure modi-fications/devising toward natural minerals for advanced energy-storage systems.

Bulk/interfacial modificationHeterostructureSulfur vacanciesLithium ion capacitorsCapacitors

Chang Liu、Zirui Song、Xinglan Deng、Shihong Xu、Renji Zheng、Wentao Deng、Hongshuai Hou、Guoqiang Zou、Xiaobo Ji

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School of Chemistry and Chemical Engineering,Hunan Institute of Engineering,Xiangtan 411104,China

College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China

Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-Containing Mineral Resources,School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaHunan Provincial Natural Science FoundationHunan Provincial Natural Science FoundationScientific Research Fund of Hunan Provincial Education DepartmentCentral South University Innovation-Driven Research Programme

52004338223784312022JJ200752023JJ4021021B00172023CXQD008

2024

10.1016/j.cclet.2023.109081

中国化学快报(英文版)
中国化学会

中国化学快报(英文版)

CSTPCD
影响因子：0.771
ISSN：1001-8417
年,卷(期)：2024.35(6)
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