Abstract: Applying styrene butadiene rubber-carboxymethyl cellulose (SBR-CMC) and polyvinylidene fluoride (PVDF) as anode binder, respectively, the influence of different anode binders on the high power li-ion battery performance was researched. Glass transition temperature of PVDF, SBR and CMC was tested by the method of differential scanning calorimetry (DSC), and the values were -51.7℃, -42.18℃ and -55.82℃, respectively. Pouch cells were prepared with the two kinds of binder. The rate performance testing result showed no obvious difference at room temperatures. However, due to the different glass-transition temperature of the two binders, the sample cells with PVDF binder exhibited superior performance in low temperature discharge. The cells were discharged at 0.5 C at the temperature of 20℃ and -40℃, and 1 C at -40℃, respectively, the discharge capacity ratio of cell with SBR-CMC binder to that of the with PVDF binder cell were 1.004, 0.706 and 0.589.

Key words: high power Li-ion battery, anode, low temperature, binder, glass-transition temperature