Layer-by-Layer Deposition of Organic-Inorganic Hybrid Multilayer on Microporous Polyethylene Separator to Enhance the Electrochemical Performance of Lithium-Ion Battery.
A simple layer-by-layer (LbL) self-assembly process of poly(acrylic acid) (PAA) and ZrO2 was applied to construct functional ultrathin multilayers on polyethylene (PE) separators without sacrificing the excellent porous structure of separators. Such PAA/ZrO2 LbL-modified PE separators possess good electrolyte wettability, excellent electrolyte uptake, high ionic conductivity and large Li(+) transference number. More importantly, the top layer of LbL self-assembly would affect the dissociation of electrolyte and the formation of solid electrolyte interphase (SEI) layer in half-cells. Compared with the pristine and (PAA/ZrO2)1PAA-modified PE separators, (PAA/ZrO2)3-modified PE separator shows a larger Li(+) transference number (0.6) and a faster tendency to form a stable SEI layer, endowing half-cells with excellent capacity retention at high C-rates and superior cycling performance. These fascinating characteristics will provide the LbL self-assembly with a promising method to improve the surface property of PE separators for high performance lithium-ion batteries.
Research Centre of Nanoscience and Nanotechnology, Shanghai University , Shanghai 200444, China.
Wuxia
W
Xu
Research Centre of Nanoscience and Nanotechnology, Shanghai University , Shanghai 200444, China.
Zhuyi
Z
Wang
Research Centre of Nanoscience and Nanotechnology, Shanghai University , Shanghai 200444, China.
Liyi
L
Shi
Donghua University , Shanghai 201620, China.
Ying
Y
Ma
Research Centre of Nanoscience and Nanotechnology, Shanghai University , Shanghai 200444, China.
Shuai
S
Yuan
Research Centre of Nanoscience and Nanotechnology, Shanghai University , Shanghai 200444, China.
Lining
L
Sun
Research Centre of Nanoscience and Nanotechnology, Shanghai University , Shanghai 200444, China.
Yin
Y
Zhao
Research Centre of Nanoscience and Nanotechnology, Shanghai University , Shanghai 200444, China.
Meihong
M
Zhang
Ångström Advanced Battery Centre, Uppsala University , 75121 Uppsala, Sweden.
Jiefang
J
Zhu
C-rate capability; Li-ion battery; layer-by-layer self-assembly; separator; surface modification