Processable Potassium Metal Anode for Stable Batteries

Energy & Environmental Materials

article

Zhenghang Wei¹  Aoxuan Wang¹  Xuze Guan¹  Guojie Li¹  Zhiwei Yang³  Chengde Huang¹  Jing Zhang⁴  Libin Ren⁴  Jiayan Luo¹  Xingjiang Liu⁴ 

[1] Key Laboratory for Green Chemical Technology of Ministry of Education, State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University;Key Laboratory of Materials Processing and Mold, Zhengzhou University, Ministry of Education;Jiangxi Key Laboratory of Nanobiomaterials, Institute of Advanced Materials, East China Jiaotong University;National Key Laboratory of Science and Technology on Power Sources, Tianjin Institute of Power Sources;Shanghai Key Lab of Advanced High-Temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University

关键词: K metal anode;    K metal battery;    processibility;    reduced graphene oxide;    stability;   

DOI  :  10.1002/eem2.12244

来源: Wiley

【 摘 要 】

The future of high-energy density electrochemical energy storage systems relies on the advancement of rechargeable batteries that utilize reactive metals as anodes. In the alkaline metal, secondary battery systems because of abundant resource, high capacity and low redox potential, potassium (K) metal secondary battery (KMB) is expected to replace the existing lithium-ion battery as a versatile platform for high-energy density, cost-effective energy storage devices. However, the difficulty in processing metal K results in nonstandard electrodes and hinders the development of KMBs. Furthermore, the mobility of the K metal anode due to its unique low-melting point character at elevated temperatures in practical conditions leads to severe instability and risks in chemical/electrochemical processes. Herein, we fabricate a processable and moldable composite K metal anode by encapsulating K into reduced graphene oxide (rGO). The composite electrode can be engineered into various shapes discretionarily with precise sizes and stabilize the K metal anode at relatively high temperatures. Remarkably, the composite anode exhibits excellent cycling performance at high current density (8 mA cm −2 ) with dendrite-free morphology. Paired with a Prussian blue cathode, the rGO–K composite anode shows much improved electrochemical performance and extended lifetime.

【 授权许可】

Unknown