Lithium–Ion Batteries

Abstract

Currently used electrolytes for lithium ion batteries have poor thermal stability, which results in a decrease in their calendar life. The thermal decomposition reactions of LiPF 6 ‐based electrolytes in solution and with the surfaces of the electrode materials are reviewed. Methods to inhibit thermal decomposition reactions and improve calendar life are also discussed.

High quality graphitized graphene as an anode material for lithium ion batteries

“…However, such high capacities were achieved in a wider voltage window of 0.01-3.0 V, making it impossible to use this material as an anode. 3 Furthermore, high irreversibility and large hysteresis are commonly observed in the cycling performances of the GO electrodes, making them unsuitable as anode materials in a practical lithium ion battery. 3 The voltage hysteresis is caused, among other reasons, by Li storage on defects such as edges and/or oxygen-and hydrogen-containing surface groups, 4 which results in poor energy efficiency for cells employing such electrodes.…”

“…3 Furthermore, high irreversibility and large hysteresis are commonly observed in the cycling performances of the GO electrodes, making them unsuitable as anode materials in a practical lithium ion battery. 3 The voltage hysteresis is caused, among other reasons, by Li storage on defects such as edges and/or oxygen-and hydrogen-containing surface groups, 4 which results in poor energy efficiency for cells employing such electrodes. 1 Moreover, the high irreversibility will much worse if the voltage window is limited to 0.01-1.2 V.…”