posted on 2024-03-05, 14:05authored byZhipeng Jiang, Chen Li, Tao Yang, Yu Deng, Jiahang Zou, Qingan Zhang, Yongtao Li
Lithium
fluoride (LiF), generated by the decomposition of fluoride
in lithium metal batteries (LMBs), is considered an essential component
for stabilizing metallic Li. However, the substantial introduction
of fluorine in batteries raises potential environmental concerns.
In this study, we designed a fluorine-free LMB by integrating a fluorine-free
electrolyte and a fluorine-free binder to construct a B/O/N hybrid
solid electrolyte interphase (SEI) capable of providing good stability
and fast Li+ transport ability. At a test temperature of
60 °C, the LiF-free SEI can achieve a highly reversible Li plating/stripping
efficiency, with a Coulombic efficiency of 98.8% under conditions
of 3 mA cm–2 and 3 mAh cm–2. Furthermore,
the F-free LMB battery exhibits a rapid charging/discharging rate
of 100 C with a capacity exceeding 80 mAh g–1 and
demonstrates stable cycling performance over 500 cycles at 50 C. The
fast-charging capability was further verified in practical Li–LiFePO4 full cells.