Effect of silicon anode binder on the performance of Li-ion battery
In order to investigate the effect of anode binder on the performance of Li-ion battery,the electrochemical performance of battery is evaluated,which is prepared with styrene butadiene rubber(SBR),modified SBR and styrene acrylate(SA)as anode binder,respectively.SA binder has better performance than SBR binder in internal resistance,low temperature discharge and cycle performance.The direct current resistance(DCR)of battery with SA as anode binder is 28.68 mΩ at 25℃,which is 22.08%lower than that with SBR binder,and it is 26.26%lower at-20℃.Compared with the battery prepared with SBR binder,the capacity ratio at-20 ℃ to 25 ℃ of the battery prepared with SA binder discharged at 1.0 C(2.3 A)in 2.8-4.2 V is increased by 10.78 percentage points.The capacity retention rate is increased by 9.3 percentage points after 700 fast charging cycles at 2.2 C at 25 ℃.
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