Waterborne polyurethane as a carbon coating for micrometre-sized silicon-based lithium-ion battery anode material.

ABSTRACT: Waterborne polyurethane (WPU) is first used as a carbon-coating source for micrometre-sized silicon. The remaining nitrogen (N) and oxygen (O) heteroatoms during pyrolysis of the WPU interact with the surface oxide on the silicon (Si) particles via hydrogen bonding (Si-OH⋯N and Si-OH⋯O). The N and O atoms involved in the carbon network can interact with the lithium ions, which is conducive to lithium-ion insertion. A satisfactory performance of the Si@N, O-doped carbon (Si@CNO) anode is gained at 25 and 55°C. The Si@CNO anode shows stable cycling performance (capacity retention of 70.0% over 100 cycles at 25°C and 60.3% over 90 cycles at 55°C with a current density of 500 mA g^-1) and a superior rate capacity of 864.1 mA h g^-1 at 1000 mA g^-1 (25°C). The impr

SUBMITTER: Yan C 

PROVIDER: S-EPMC6124086 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature