期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 5, 页码 3314-3322出版社
AMER CHEMICAL SOC
DOI: 10.1021/am508149n
关键词
Li-ion battery; rate capabiity; separator; surface modification; self-assembly
资金
- Natural Science Foundation of Shanghai [13ZR1454400]
- Shanghai Science and Technology Committee [14520722200]
- Shanghai Municipal Science and Technology Commission [13DZ2292100]
- National Natural Science Foundation of China [21102088]
A simple and environmentally friendly self-assembly process of oppositely charged polymer PEI and inorganic oxide SiO2 was demonstrated for the construction of an ultrathin layer on the surface of PE separator. The XPS, FT-IR, SEM, and EDS characterizations give clear evidence of the successful self-assembly of PEI and SiO2 without significantly increasing the thickness and sacrificing the pristine porous structure of PE separator. This process improves a variety of crucial properties of PE separator such as the electrolyte wetting, the electrolyte uptake, the thermal stability, the ionic conductivity, Li+ transference number, the electrochemical stability and the compatibility with lithium electrode, endowing lithium-ion battery (Li as anode and LiCoO2 as cathode) with excellent capacity retention at high C-rates and superior cycling performance. At the current density of 5 C, the cell with PE separator almost loses all the capacity. In contrast, the cell with (PEI/SiO2)-modified PE separator still holds 45.2% of the discharge capacity at 0.2 C. The stabilized SEI formation and high Li+ transference number of (PEI/SiO2)-modified PE separator were interpreted to be the substantial reasons leading to the remarkably enhanced battery performance, rendering some new insights into the role of the separator in lithium-ion batteries.
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