Robust potassium metal anodes realized by ferroelectricity and high conductivity separator. (15th November 2022)

• Record Type: Journal Article
• Authors: Wang, Jianyi; Chen, Menghui; Lu, Zicong; Chen, Zhida; Si, Liping
• Is Part Of: Materials science in semiconductor processing. Volume 151(2023)
• Publication Date: 2022-11-15
• Subjects: Separator -- Barium titanate -- Potassium metal batteries -- Dead potassium and dendrite; Semiconductors -- Periodicals; Integrated circuits -- Materials -- Periodicals; Semiconducteurs -- Périodiques; Circuits intégrés -- Matériaux -- Périodiques; Electronic journals; 621.38152
• DOI: 10.1016/j.mssp.2022.107001
• Languages: English
• ISSNs: 1369-8001

Abstract

Abstract: Low-cost potassium (K) metal batteries (KMBs) have drawn broad attention due to the prospect of wide applications. However, the applications of KMBs have been severely troubled by the problems from the K dendrites and dead K. The disordered K dendrite growth causes repeated fracture and repair of solid electrolyte interphase (SEI), and the aggregation of dead K detached from current collectors around the cathode region leads to rapid capacity attenuation in KMBs. Herein, a barium titanate/reduced graphene oxide (BaTiO3 @rGO) composite on glass fiber (GF) separator was prepared with ferroelectrically spin-polarized and high conductive, which highly effective in inhibiting disorderly K dendrite growth and activate the inactive dead K by improving electrochemical performance without affecting the transport of positively charged K ions. The capacity retention ratio (CRR) and attenuation rate of full-cell of KMBs adopting BaTiO3 @rGO separator are 87% and 0.02% after 380 cycles at 0.5A g −1, respectively. This research defines an effective strategy to inhibit K dendrites and activate dead K in KMBs. Highlights: The resulting BaTiO3 @rGO separator inhibiting disorderly K dendrite growth and activate the inactive dead K. The BaTiO3 @rGO on the as-prepared separator plays a critical role in improving electrochemical performance, realizing a long cycle stability at 0.5A g −1 . Our functional separator was prepared with ferroelectrically spin-polarized and high conductive, which highly effective in KMBs. This research defines an effective strategy to inhibit K dendrites and activate dead K in KMBs.