High performances LiMnFePO4 / Li4Ti5O12 full cell by functionalized polymeric additive

Herein, we report a novel class of additives based on functional polymers for electrode fabrication. A small quantity of a 2,3-dimethoxybenzene (DMB)-based polymer was mixed with a state-of-the-art binder, poly(vinylene difluoride) (PVDF), to greatly improve the first fast charge-discharge and high-voltage LiMnFePO4/Li4Ti5O12 batteries operating at 3.0 V. Dual effects of the polymer were reported, i.e., trapping of the soluble Mn2+ of positive electrodes and in-situ formation of a passivation layer on the negative electrode (AlF3). Both effects are possible because the functional polymer was used; this synergic effect enhance cell performances by 16.7% after more than 300 cycles at 45 °C and 1 C.