Novel functionalized electrolyte for MCMB/Li1.156Mn1.844O4lithium-ion cells

Abstract

A novel functionalized electrolyte based on Li₂B₁₂F₉H₃ was investigated to improve the electrochemical and safety performance of lithium-ion cells using a lithium manganese oxide spinel positive electrode and a mesocarbon microbeads (MCMB) negative electrode. The test results showed that Li₂B₁₂F₉H₃ can act both as the lithium salt, like the conventional LiPF₆, and as the redox shuttle for overcharge protection of lithium-ion cells. In addition, the performance of the lithium-ion cells was dramatically improved by the addition of lithium bis(oxalato)borate and tris(pentafluorophenyl)borane as electrolyte additives. With the help of the proposed additives, MCMB/Li_1.156Mn_1.844O₄lithium ion cells maintained more than 85% capacity after 1200 cycles.