Fabrication of gel-type Li-ion batteries and their electrochemical and safety properties

doi:10.19799/j.cnki.2095-4239.2020.0424

Abstract

Abstract:

Pouch-type gel Li-ion batteries were fabricated by in-situ polymerization and constructed from a LiCoO₂ cathode, a graphite anode, a ceramics-coated polyethylene separator, and a gel electrolyte that was dispersed in between. Electrochemical tests showed that the battery using the gel electrolyte exhibited comparable capacity and cycling stability compared with that using the liquid electrolyte. The differential scanning calorimeter tests indicated that the gel electrolyte exhibited an improved thermal stability toward LiCoO₂ and graphite than the liquid electrolyte. The hot-plate and accelerating rate calorimetry tests suggested that the safety property of the battery can be enhanced using gel electrolytes instead of liquid electrolytes. An ultrathin pouch battery was also fabricated by in-situ polymerization, and it showed good flexibility and can still operate after folding and cutting.

Key words: lithium secondary batteries, gel electrolytes, poly(pentaerythritol triacrylate), in-situ polymerization, LiCoO₂

CLC Number:

TM 911

Jian TU, Xiongwen XU, Haibo HU, Yang NIE, Tao ZENG, Qiushi SUN, Hao CHENG, Jian XIE, Xinbing ZHAO. Fabrication of gel-type Li-ion batteries and their electrochemical and safety properties[J]. Energy Storage Science and Technology, 2021, 10(3): 1025-1031.

Figures/Tables 6

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