碳负极黏结剂对于动力锂离子电池性能的影响

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 °C, -42.18 °C and -55.82 °C, 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 °C and -40 °C, and 1 C at -40 °C, 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.