Use of a Chelate Complex with Boron as a Lithium Salt for Lithium Battery Electrolytes

A chelate complex with boron, lithium bis[2,3‐naphthalenediolato(2‐)‐O,O']borate was used in lithium battery electrolytes for prototype cells. This lithium salt remains a safe and thermally stable compound up to 320°C without melting. A high specific conductivity is exhibited in spite of its high viscosity (1.732 cP) in a electrolyte/ethylene carbonate‐1,2‐dimethoxyethane (mol ratio 2:3) binary solvent mixture at 25°C. Based on the discharge characteristics of a prototype cell, this lithium salt electrolyte resulted in high energy density at a cutoff potential of 2.5 V vs. .