Xuemei Ma , Dianwei Zhang , Hongwei Fu , Apparao M. Rao , Jiang Zhou , Ling Fan , Bingan Lu
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引用次数: 0
Abstract
The solid electrolyte interphase (SEI) critically governs the performance of potassium-ion batteries (PIBs). However, present-day SEIs cannot prevent persistent parasitic reactions between the electrode and electrolyte due to SEI’s low energy band gap and high ion migration energy barrier. Here, we propose an SEI energy band engineering strategy by screening the band-gap width and migration energy barrier of various SEI components, and we found that the Si-O-SEI simultaneously increases SEI’s energy band gap and lowers the ion migration energy barrier to enable good electron-blocking capability and high K+ ion diffusion. Our Si-O-SEI prepared in situ on the electrode surface, using a simple additive, enables carbonate-based electrolytes to achieve a highly reversible potassium plating and stripping with a Coulombic efficiency (CE) of 99.2%, together with the upgraded reversibility of the graphite anode. SEI composition and structural modulation through a simple and generic strategy provide a valuable research platform for developing high-performance PIB electrolytes.
期刊介绍:
Joule is a sister journal to Cell that focuses on research, analysis, and ideas related to sustainable energy. It aims to address the global challenge of the need for more sustainable energy solutions. Joule is a forward-looking journal that bridges disciplines and scales of energy research. It connects researchers and analysts working on scientific, technical, economic, policy, and social challenges related to sustainable energy. The journal covers a wide range of energy research, from fundamental laboratory studies on energy conversion and storage to global-level analysis. Joule aims to highlight and amplify the implications, challenges, and opportunities of novel energy research for different groups in the field.