journal article·2023-04

Building K–C Anode with Ultrahigh Self‐Diffusion Coefficient for Solid State Potassium Metal Batteries Operating at −20 to 120 °C

Jian‐Fang Wu, Wang Zhou, Zixing Wang, Wei‐Wei Wang, Xuexia Lan, Hanghang Yan, Tuo Shi, Renzong Hu, Xiangyang Cui, Chaohe Xu, Xiangming He, Bing‐Wei Mao, Tao Zhang, Jilei Liu

Advanced Materials· Volume 35· Issue 16
Publisher page

Abstract

Abstract Solid state potassium (K) metal batteries are intriguing in grid‐scale energy storage, benefiting from the low cost, safety, and high energy density. However, their practical applications are impeded by poor K/solid electrolyte (SE) interfacial contact and limited capacity caused by the low K self‐diffusion coefficient, dendrite growth, and intrinsically low melting point/soft features of metallic K. Herein, a fused‐modeling strategy using potassiophilic carbon allotropes molted with K is demonstrated that can enhance the electrochemical performance/stability of the system via promoting K diffusion kinetics (2.37 × 10−8 cm2 s−1), creating a low interfacial resistance (≈1.3 Ω cm2), suppressing dendrite growth, and maintaining mechanical/thermal stability at 200 °C. A homogeneous/stable K stripping/plating is consequently implemented with a high current density of 2.8 mA cm−2 (at 25 °C) and a record‐high areal capacity of 11.86 mAh cm−2 (at 0.2 mA cm−2). The enhanced K diffusion kinetics contribute to sustaining intimate interfacial contact, stabilizing the stripping/plating at high current densities. Full cells coupling ultrathin K–C composite anodes (≈50 µm) with Prussian blue cathodes and β/β″‐Al2O3 SEs deliver a high energy density of 389 Wh kg−1 with a retention of 94.4% after 150 cycles and fantastic performances at −20 to 120 °C.
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Research context

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

College of Materials Science and Engineering Hunan Joint International Laboratory of Advanced Materials and Technology of Clean Energy Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology Hunan University Changsha 410082 P. R. China

State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, and Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 P. R. China

School of Materials Science and Engineering, Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials South China University of Technology Guangzhou 510640 P. R. China

State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Hunan 410082 P. R. China

The Key Laboratory of Microelectronics Devices and Integrated Technology Institute of Microelectronics Chinese Academy of Sciences Beijing 100029 P. R. China

College of Aerospace Engineering Chongqing University Chongqing 400044 P. R. China

Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 P. R. China

State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics Chinese Academy of Sciences 1295 Dingxi Road Shanghai 200050 P. R. China

Funding

National Key Research and Development Program of China · National Natural Science Foundation of China · Natural Science Foundation of Chongqing

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