posted on 2021-05-11, 16:06authored byLongfei Han, Can Liao, Xiaowei Mu, Na Wu, Zhoumei Xu, Jingwen Wang, Lei Song, Yongchun Kan, Yuan Hu
The poly(ethylene oxide) solid polymer
electrolyte (PEO SPE) has
recently received much attention, however, the organic components
in the SPE are still flammable. In this paper, we find that the high
efficiency halogen-free aluminum (Al) diethyl hypophosphite flame
retardant (ADP) is effective in reducing the flammability of PEO SPE.
The SEI layer containing Al and phosphorus (P) inhibits the growth
of lithium dendrite and enhances the cycle life of the battery. The
capacity of a LiFePO4/SPE/Li battery containing ADP is
still 123.2 mAh g–1 at 1.0 C and the Coulombic efficiency
is as high as 99.95% after 1000 cycles (60 °C). At the same time,
Al, P-rich SEI can inhibit the growth of lithium dendrite and the
cycle stability of the battery is further enhanced.