不同剂量粘结剂对锰酸锂电池电化学性能的影响

Effect of Different Dosages of Binder on Electrochemical Properties of LiMnO Batteries

可充电锂电池具有比能量高、质量轻、绿色环保等优点,是极具发展前景的研究方向.其中锂电池电极中粘结剂的不同剂量影响着电极粘结力、电极柔韧性、电极电化学稳定性等,从而影响整个电池的性能,故选择最适合剂量的粘结剂尤为重要.可充电锂电池的活性物质:粘结剂:导电剂的最佳比值为8:1:1,本着节省材料的原则,此次实验制备的扣式电池中分别采取0.05、0.06、0.07克的粘结剂制备成二次锂离子电池进行测试,分别用CV、EIS、电池充放电及循环特性对其电化学性能进行表征分析.实验结果表明:粘结剂剂量为0.06克的电池充放电性能最好,可逆容量最好,EIS的阻抗值最小,且在该剂量下制备的电极内阻小,电极电导率高,制备的电池首次充放电比容量分别为131.19mAh/g和134.19mAh/g.当充放电倍率电流增加到5C时,可逆放电比容量仍有54mAh/g,且电池库伦效率高达98.98%.

Lithium battery has the advantages of high specific energy,light weight,environmental friendliness,etc.,making it a promising research subject.However,different dosages of binder in a Lithium battery electrode affects its cohesive force,flexibility,stability of the electrochemical capacity etc.,thereby affecting the electrochemical performance of the battery,so it is particularly important to choose the most suitable dosage of binder.The best ratio of active material,binder and conductive agent of rechargeable lithium battery is 8:1:1.In this experiment,to save materials,0.05,0.06,0.07 grams of binder were used in preparation of the lithium battery,and its chemical properties were characterized by CV,EIS,charge-discharge performance,and cyclic voltammetric characteristics.The experimental results show that the battery with a binder dosage of 0.06 gram has the best charge and discharge performance,the best reversible capacity,the smallest EIS impedance,and therefore its internal resistance is small and the conductivity is high.The first charge-discharge specific capacity is 131.19 mAh/g and 134.19 mAh/g.When the charge-discharge rate current increases to 5C,the reversible discharge specific capacity is still 54 mAh/g,and the coulombic efficiency of the battery is as high as 98.98%.