DataVXAdvanced MaterialsPaper
journal article·2020-12Open access

Unraveling the Nature of Excellent Potassium Storage in Small‐Molecule Se@Peapod‐Like N‐Doped Carbon Nanofibers

Rui Xu, Yu Yao, Haiyun Wang, Yifei Yuan, Jiawei Wang, Hai Yang, Yu Jiang, Pengcheng Shi, Xiaojun Wu, Zhangquan Peng, Zhong‐Shuai Wu, Jun Lu, Yan Yu

Advanced Materials· Volume 32· Issue 52
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Source abstract

Abstract

Abstract The potassium–selenium (K–Se) battery is considered as an alternative solution for stationary energy storage because of abundant resource of K. However, the detailed mechanism of the energy storage process is yet to be unraveled. Herein, the findings in probing the working mechanism of the K‐ion storage in Se cathode are reported using both experimental and computational approaches. A flexible K–Se battery is prepared by employing the small‐molecule Se embedded in freestanding N ‐doped porous carbon nanofibers thin film (Se@NPCFs) as cathode. The reaction mechanisms are elucidated by identifying the existence of short‐chain molecular Se encapsulated inside the microporous host, which transforms to K2Se by a two‐step conversion reaction via an “all‐solid‐state” electrochemical process in the carbonate electrolyte system. Through the whole reaction, the generation of polyselenides (K2Sen, 3 ≤ n ≤ 8) is effectively suppressed by electrochemical reaction dominated by Se2 molecules, thus significantly enhancing the utilization of Se and effecting the voltage platform of the K–Se battery. This work offers a practical pathway to optimize the K–Se battery performance through structure engineering and manipulation of selenium chemistry for the formation of selective species and reveal its internal reaction mechanism in the carbonate electrolyte.
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Research context

Energy storageNanomaterials

OpenAlex topics: Advanced Battery Materials and Technologies · Advancements in Battery Materials · Advanced battery technologies research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Hefei National Laboratory for Physical Sciences at the Microscale Department of Materials Science and Engineering CAS Key Laboratory of Materials for Energy Conversion University of Science and Technology of China Hefei Anhui 230026 China

Chemical Sciences and Engineering Division Argonne National Laboratory 205‐167A, 9700 South, Cass Ave. Lemont IL 60439 USA

State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun Jilin 130022 China

State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences 457 Zhongshan Road Dalian Liaoning 116023 China

Dalian National Laboratory for Clean Energy (DNL) Chinese Academy of Sciences (CAS) Dalian Liaoning China

Funding

National Basic Research Program of China · National Natural Science Foundation of China · Fundamental Research Funds for the Central Universities · National Postdoctoral Program for Innovative Talents · China Postdoctoral Science Foundation · Dalian Institute of Chemical Physics · U.S. Department of Energy · Office of Energy Efficiency and Renewable Energy · Vehicle Technologies Office

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