Theory-Driven Design of a Cationic Accelerator for High-Performance Electrolytic MnO2-Zn Batteries

被引:101
作者
Chuai, Mingyan [1 ,2 ]
Yang, Jinlong [1 ]
Tan, Rui [3 ]
Liu, Zaichun [1 ,2 ]
Yuan, Yuan [1 ,2 ]
Xu, Yan [2 ]
Sun, Jifei [2 ]
Wang, Mingming [2 ]
Zheng, Xinhua [2 ]
Chen, Na [2 ]
Chen, Wei [2 ]
机构
[1] Shenzhen Univ, Coll Mat Sci & Engn, Guangdong Res Ctr Interfacial Engn Funct Mat, Shenzhen 518060, Peoples R China
[2] Univ Sci & Technol China, Hefei Natl Res Ctr Phys Sci Microscale, Sch Chem & Mat Sci, Dept Appl Chem, Hefei 230026, Anhui, Peoples R China
[3] Imperial Coll London, Dept Chem Engn, London SW7 2AZ, England
基金
中国国家自然科学基金;
关键词
cation migration; cationic accelerators; deposition; dissolution chemistry; electrolytic MnO; (2)-Zn batteries; large-scale energy storage; ENERGY; OXIDE; STORAGE;
D O I
10.1002/adma.202203249
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Aqueous electrolytic MnO2-Zn batteries are considered as one of the most promising energy-storage devices for their cost effectiveness, high output voltage, and safety, but their electrochemical performance is limited by the sluggish kinetics of cathodic MnO2/Mn2+ and anodic Zn/Zn2+ reactions. To overcome this critical challenge, herein, a cationic accelerator (CA) strategy is proposed based on the prediction of first-principles calculations. Poly(vinylpyrrolidone) is utilized as a model to testify the rational design of the CA strategy. It manifests that the CA effectively facilitates rapid cations migration in electrolyte and adequate charge transfer at electrode-electrolyte interface, benefiting the deposition/dissolution processes of both Mn2+ and Zn2+ cations to simultaneously improve kinetics of cathodic MnO2/Mn2+ and anodic Zn/Zn2+ reactions. The resulting MnO2-Zn battery regulated by CA exhibits large reversible capacities of 455 mAh g(-1) and 3.64 mAh cm(-2) at 20 C, as well as a long lifespan of 2000 cycles with energy density retention of 90%, achieving one of the best overall performances in the electrolytic MnO2-Zn batteries. This comprehensive work integrating theoretical prediction with experimental studies provides opportunities to the development of high-performance energy-storage devices.
引用
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页数:10
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