image: Schematics illustrating the role of DFEC in improving solid electrolyte interphase (SEI) and affection on Li deposition in ether electrolyte. view more Credit: ©Science China Press This study is led by Prof. Ji Qian and Prof. Renjie Chen (Department of Energy and Environmental Materials, School of Materials Science and Engineering, Beijing Institute of Technology). In this work, fluorinated cyclic carbonate (DFEC) is introduced into ether electrolyte as a SEI-forming additive. The modified electrolyte can improve the interface of Li metal anode and achieve high efficiency and long cycling stability of LMBs.
LMBs are regarded as the most promising next-generation battery system due to the high specific capacity (3860 mAh g −1 ) and low electrode potential (-3.04 V vs. SHE) of the Li metal anode. However, there are many limiting factors which limit the development of LMBs, as follows: side reaction between Li anode and electrolyte, Li dendrite growth and serious volume effect of Li anode, etc., which lead to low coulombic efficiency (CE) and poor cycle life. Stable solid electrolyte interphase (SEI) is the key to achieve high efficiency and long cycling stability of LMBs. Adjusting SEI through electrolyte optimization is regard as a low-cost and efficient way to improve Li metal anode interface. So, it is critical to design an electrolyte formulation which can form a stable SEI, the key is the choice of solvents and film-forming additive.
Recently, Prof. Renjie Chen and Prof. Ji Qian proposed an ether-ester mixed electrolyte in which trans-difluoroethylene carbonate (DFEC) was introduced […]
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