posted on 2024-02-26, 07:29authored byXiaoli Yi, Xinhai Li, Jing Zhong, Zhuangzhuang Cui, Zhixing Wang, Huajun Guo, Jiexi Wang, Guochun Yan
The
ether-based electrolytes show excellent performance on anodes
in sodium-ion batteries (SIBs), but they still show poor compatibility
with the cathodes. Here, ether electrolytes with NaBF4 as
the main salt or additive were applied in NFM//HC full cells and showed
enhanced performance than the electrolyte with NaPF6. Then,
BF4– was found to have a stronger interaction
with Na+, which could reduce the solvation of Na+ with the solvent, thus inducing the formation of the cathode electrolyte
interface (CEI) and solid electrolyte interface (SEI) layers rich
in inorganic species. Moreover, the morphology, structure, composition,
and solubility of CEI and SEI were explored, concluding that NaBF4 could induce more stable CEI and SEI layers rich in B-containing
species and inorganics. This work proposes using NaBF4 as
the main salt or additive to improve the performance of ether electrolytes
in NFM//HC full cells, which provides a strategy to improve the compatibility
of ether-based electrolytes and cathodes.