An inverse-spinel Mg2MnO4 cathode for high-performance and flexible aqueous zinc-ion batteries. Issue 43 (26th October 2020)

• Record Type: Journal Article
• Authors: Yuan, Xuming; Sun, Tianjiang; Zheng, Shibing; Bao, Junquan; Liang, Jing; Tao, Zhanliang
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 43(2020)
• Page Start: 22686
• Page End: 22693
• Publication Date: 2020-10-26
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta08916h
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : The inverse-spinel Mg2 MnO4 has rich high-average-valence-state Mn (4.5). P-APSA hydrogel, which has high adhesion and good compatibility with the Zn anode, is used as an electrolyte to construct a flexible battery. Abstract : Aqueous zinc-ion batteries (AZIBs) have gained extensive attention owing to low cost and high safety but their development has reached a bottleneck due to the limited number of suitable cathode materials available. Here, we report an inverse-spinel-structured Mg2 MnO4 nanosheet cathode for AZIBs. Mn 4+ -rich Mg2 MnO4 allows remarkable discharge capacity and structure stability. Thus, the Zn//Mg2 MnO4 battery exhibits a high discharge capacity of 371.7 mA h g −1 at 150 mA g −1 and excellent long-cycle life over 500 and 2000 cycles with no obvious capacity fading at 1500 and 3000 mA g −1, respectively. Moreover, the Mg2 MnO4 electrode exhibits a Zn 2+ /H + deintercalation/intercalation mechanism during the charging/discharging process, resulting in fast ion-transfer kinetics. In addition, copolymerized 2-acrylamido-2-methylpropane sulfonic acid–acrylamide (P-APSA) hydrogel electrolyte is utilized to fabricate a flexible Zn//P-APSA//Mg2 MnO4 battery. Benefitting from the good compatibility and high adhesion between the P-APSA hydrogel and Zn anode, the battery exhibits impressive electrochemical performance. This work provides an option to design high-performance AZIBs for durable applications.