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An Anode‐Free Potassium‐Metal Battery Enabled by a Directly Grown Graphene‐Modulated Aluminum Current Collector

Yu ZhaoBeijing Graphene Institute Beijing 100095 P. R. ChinaBingzhi LiuBeijing Graphene Institute Beijing 100095 P. R. ChinaYuyang YiCollege of Energy Soochow Institute for Energy and Materials Innovations Light Industry Institute of Electrochemical Power Sources Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province Soochow University Suzhou 215006 P. R. ChinaXueyu LianCollege of Energy Soochow Institute for Energy and Materials Innovations Light Industry Institute of Electrochemical Power Sources Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province Soochow University Suzhou 215006 P. R. ChinaMenglei WangBeijing Graphene Institute Beijing 100095 P. R. ChinaShuo LiCollege of Energy Soochow Institute for Energy and Materials Innovations Light Industry Institute of Electrochemical Power Sources Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province Soochow University Suzhou 215006 P. R. ChinaXianzhong YangCollege of Energy Soochow Institute for Energy and Materials Innovations Light Industry Institute of Electrochemical Power Sources Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province Soochow University Suzhou 215006 P. R. ChinaJingyu SunBeijing Graphene Institute Beijing 100095 P. R. China

2022en

ABI

Annotatsiya

Abstract Potassium (K)‐metal batteries have emerged as a promising energy‐storage device owing to abundant K resources. An anode‐free architecture that bypasses the need for anode host materials can deliver an elevated energy density. However, the poor efficiency of K plating/stripping on potassiophobic anode current collectors results in rapid K inventory loss and a short cycle life. Herein, commercial Al foils are decorated with an ultrathin graphene‐modified layer (Al@G) through roll‐to‐roll plasma‐enhanced chemical vapor deposition. By harnessing strong adhesion (10.52 N m −1 ) and a high surface energy (66.6 mJ m −2 ), the designed Al@G structure ensures a highly smooth and ordered K plating/stripping process. Consequently, during K‐metal plating/stripping, Al@G can operate at a current density of up to 4.0 mA cm −2 and cyclic capacity of up to 4.0 mAh cm −2 , with an ultralong lifespan of up to 1000 h at 0.5 mA cm −2 and stable cycling of up to 750 h under periodic current fluctuations of 0.1–2.0 mA cm −2 . In addition, a novel anode‐free K‐metal full‐cell prototype enabled by Al@G anode current collectors is constructed, demonstrating ameliorative cyclic stability.

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Identifikatorlar

DOI: 10.1002/adma.202202902

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