摘要
通过对比分析氧化亚硅碳(SiO)、石墨(Graphite)及其组成的复合材料(SiO/Gr)的充电特征曲线,明确了SiO/Gr复合材料在脱嵌锂过程中的锂离子储放机理:嵌锂反应中,在初始电位至0.24 V电压区间,石墨自身容量的7%,SiO自身容量的90%先得到发挥;在[0.24 V,0.005 V]区间,SiO和石墨的剩余容量得到完全发挥;脱锂过程同嵌锂过程相反,依据上述结论和SiO/Gr的放电曲线计算其各组成容量的占比,结果与实际容量占比对比相同。根据上述复合材料的储锂机理,分析了不同过量比设计参数与SiO发挥容量占负极总容量比例关系,预测并验证了过量比设计参数与电池循环寿命的相关关系。
The lithium ion storage mechanism of SiO/Gr composite material was investigated using electrochemical analyses by comparing the discharge curves of SiO,graphite and its composite materials.The results reveal that the capacity of 7%graphite and 90%SiO in the compound material is released between the initial voltage and 0.24 V firstly,and then the residual capacity plays a role until the voltage reaches 5 mV.The conclusion is verified by means of comparing the real ratio of SiO in SiO/Gr with the calculated value obtained by the discharge curve.On the basis of the conclusion,the relationship between N/P ratio and the real capacity proportion of SiO and its influence on cycle life of lithium ion batterywas studied and validated by experiments.
作者
连林
郑媛媛
靳承铀
LIAN LIN;ZHENG Yuan-yuan;JIN Cheng-you(Zhongtian Energy Storage Technology Co.,Ltd.,Nantong Jiangsu 226000,China)
出处
《电源技术》
CAS
北大核心
2019年第11期1761-1763,1770,共4页
Chinese Journal of Power Sources
基金
江苏省重点研发计划——产业前瞻与共性关键技术项目(BE2016008-4)
