石墨负极对锂电池低温充电性能的影响

Effect of Graphite Anode on Low Temperature Charging Performance of Lithium Battery

通过对常规片层状人造石墨负极(XFH)和二次造粒石墨负极(SS)低温充电性能研究,提出了锂电池低温析锂的相关表征方法。研究表明,与常规负极相比,二次造粒石墨负极更有利于锂电池低温充电性能的提高。SS负极材料-10℃,0.1C/0.5C循环50周后低温放电容量保持率高达100.12%,低温循环后具有较高的容量恢复率(100%),且二次造粒负极材料电池高温55℃,1C循环788周容量保持率90.62%,高温55℃搁置7天后荷电保持率为96.14%,容量恢复率为98.04%,高温性能优异。

By studying the low-temperature charging performance of conventional layered artificial graphite(XFH)and secondary-granulated graphite(SS)materials,the related characterization methods for lithium deposition at low temperature for lithium batteries are proposed.Studies show that compared with the conventional negative electrode materials,the secondary granulated graphite is more conducive to the improvement of the low-temperature charging performance of the Lithium battery.The negative electrode material of SS has a discharge capacity retention rate up to 100.12%at-10℃and the charge and discharge rate of 0.1C/0.5C for 50 cycles.The capacity recovery rate is 100%after low-temperature cycles.Even more,the high temperature performance is excellent.The negative electrode of secondary granulated graphite battery has the capacity retention rate of 90.62%at 55℃and the rate of 1C for 788 cycles.Shelve after 7 days at the high temperature of 55℃,the charge retention rate is 96.14%,and the capacity recovery rate is 98.04%.