Direct surface coating of high voltage LiCoO₂ cathode with P(VDF-HFP) based gel polymer electrolyte.

ABSTRACT: For high-voltage cycling of lithium-ion batteries, a gel polymer Li-ion conductor layer, P(VDF-HFP)/LiTFSI (PHL) with high electrochemical stability has been coated on the surfaces of as-formed LiCoO₂ (LCO) cathodes by a solution-casting technique at low temperature. An LCO cathode coated with around 3 μm thickness of the PHL ultrathin membrane, retains 88.4% of its original capacity (184.3 mA h g^-1) after 200 cycles in the 3.0-4.6 V range with a standard carbonate electrolyte, while the non-coated one retains only 80.4% of its original capacity (171.5 mA h g^-1). The reason for the better electrochemical behaviors and high-voltage cycling is related to the distinctive characteristics of the PHL coating layer that is compact, has highly-continuous surface co

SUBMITTER: Chen H 

PROVIDER: S-EPMC9055184 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature