DataVXAdvanced Functional MaterialsPaper
journal article·2022-07

Dynamic Reversible Evolution of Solid Electrolyte Interface in Nonflammable Triethyl Phosphate Electrolyte Enabling Safe and Stable Potassium‐Ion Batteries

Shunping Ji, Jielei Li, Junfeng Li, Chunyan Song, Shuo Wang, Kexuan Wang, Kwan San Hui, Chenyang Zha, Yunshan Zheng, Duc Anh Dinh, Shi Chen, Jintao Zhang, Wenjie Mai, Zikang Tang, Zongping Shao, Kwun Nam Hui

Advanced Functional Materials· Volume 32· Issue 28
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Source abstract

Abstract

Abstract Potassium‐ion batteries (PIBs) are a favorable alternative to lithium‐ion batteries (LIBs) for the large‐scale electrochemical storage devices because of the high natural abundance of potassium resources. However, conventional PIB electrodes usually exhibit low actual capacities and poor cyclic stability due to the large radius of potassium ions (1.39 Å). In addition, the high reactivity of potassium metal raises serious safety concerns. These characteristics seriously inhibit the practical use of PIB electrodes. Here, zinc phosphide composites are rationally designed as PIB anodes for operation in a nonflammable triethyl phosphate (TEP) electrolyte to solve the above‐mentioned issues. The optimized zinc phosphide composite with 20 wt% zinc phosphate presents a high specific capacity (571.1 mA h g−1 at 0.1 A g−1) and excellent cycling performance (484.9 mA h g−1 with the capacity retention of 94.5% after 1000 cycles at 0.5 A g−1) in the KFSI‐TEP electrolyte. XPS depth profile analysis shows that the improved cycling stability of the composite is closely related to the reversible dynamic evolutions and conversions of the sulfur‐containing species in the solid electrolyte interphase (SEI) during the charge/discharge process. This dynamic reversible SEI concept may provide a new strategy for the design of superior electrodes for PIBs.
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Research context

Energy storageComposites

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

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

Affiliations

Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering University of Macau Avenida da Universidade Taipa Macau SAR 999078 P. R. China

Analysis and Testing Center Shenzhen Technology University Shenzhen 518118 China

School of Engineering Faculty of Science University of East Anglia Norwich NR4 7TJ United Kingdom

NTT Hi‐Tech Institute Nguyen Tat Thanh University Ho Chi Minh City 700000 Vietnam

Key Laboratory for Colloid and Interface Chemistry Ministry of Education School of Chemistry and Chemical Engineering Shandong University Jinan 250100 China

Siyuan Laboratory Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials Department of Physics Jinan University Guangzhou Guangdong 510632 China

State Key Laboratory of Materials‐Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University Nanjing 211816 China

WA School of Mines: Minerals Energy and Chemical Engineering (WASM‐MECE) Curtin University Perth WA 6102 Australia

Funding

Science and Technology Development Fund

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