An Electrolytic Zn–MnO<sub>2</sub> Battery for High‐Voltage and Scalable Energy Storage
Dongliang Chao, Wanhai Zhou, Chao Ye, Qinghua Zhang, Yungui Chen, Lin Gu, Kenneth Davey, Shi‐Zhang Qiao
Abstract
Abstract Zinc‐based electrochemistry is attracting significant attention for practical energy storage owing to its uniqueness in terms of low cost and high safety. However, the grid‐scale application is plagued by limited output voltage and inadequate energy density when compared with more conventional Li‐ion batteries. Herein, we propose a latent high‐voltage MnO 2 electrolysis process in a conventional Zn‐ion battery, and report a new electrolytic Zn–MnO 2 system, via enabled proton and electron dynamics, that maximizes the electrolysis process. Compared with other Zn‐based electrochemical devices, this new electrolytic Zn–MnO 2 battery has a record‐high output voltage of 1.95 V and an imposing gravimetric capacity of about 570 mAh g −1 , together with a record energy density of approximately 409 Wh kg −1 when both anode and cathode active materials are taken into consideration. The cost was conservatively estimated at <US$ 10 per kWh. This result opens a new opportunity for the development of Zn‐based batteries, and should be of immediate benefit for low‐cost practical energy storage and grid‐scale applications.