Trimethyl borate and TRIPHENYL BORATE (cas 1095-03-0) as electrolyte additives for LiFePO4 cathode with enhanced high temperature performance
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Add time:08/14/2019 Source:sciencedirect.com
Alkyl- and phenyl-substituted borate anion receptors, TRIPHENYL BORATE (cas 1095-03-0) (TPB) and trimethyl borate (TMB), are investigated as electrolyte additives in lithium ion batteries (LiFePO4 cathode, 1 M LiPF6 EC-DMC 1:1 electrolyte) at 25 and 60 °C. TPB shows formation of a thick surface/electrolyte interface (SEI) which hampers ion flow and does not protect the electrode from degradation. Although useful at 25 °C, TPB at 60 °C results in only 7% capacity after 100 cycles, whereas 0.1 M TMB results in 53% capacity. TMB performance improves with increasing concentration. TMB also suppresses thermal decomposition of the electrolyte and formation of the SEI film.
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