Surface-modified Ni-rich layered oxide cathode via thermal treatment of poly(vinylidene fluoride) for lithium-ion batteries
- Surface-modified Ni-rich layered oxide cathode via thermal treatment of poly(vinylidene fluoride) for lithium-ion batteries
- 오시형; Kyung Seok Kang; Min Ji Seong; Ji-Sang Yu; Taeeun Yim
- lithium rechargeable battery; cathode; poly(vinylidene fluoride); interfacial stability; cathode electrolyte interphase
- Issue Date
- Bulletin of the Korean Chemical Society
- VOL 41, NO 11-1113
- Combination of poly(vinylidene fluoride) (PVDF) with Nirich layered cathode material create artificial cathodeelectrolyte interphases by thermal decomposition of PVDF and residual Li+ species. The pressure of the cell cycled with PVDFtreated cathode materials is markedly decreased, since the thermal treatment with PVDF selectively reduces the amounts of Li+ species. The cycling performance is improved compared to nontreated Nirich layered cathodes because the artificial cathode？electrolyte interphases effectively suppress the electrolyte decomposition as determined by systematic characterization of particle hardness, surface morphology, and electrochemical impedance spectroscopy. Additional high temperature storage tests performed with 3450dimensioned pouch cells indicate much improved recovery rates, as well as smaller open circuit voltage drops, smaller increases in internal resistance, and less swelling for cells cycled with the PVDFtreated Nirich layered cathode than with a nontreated Nirich layered cathode.
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