摘要
采用商品化的LiFePO4作为原料,对比水系粘结剂和油性粘结剂(PVDF)对LiFePO4电池初始放电容量、循环性能,倍率性能和内阻的影响。利用XRD对循环后的电池正极进行分析。研究结果表明,油性粘结剂体系中LiFePO4的容量较高,首次放电容量达到124mA·h/g,且循环性能较好,200次循环容量保持率为96.3%。发现水性粘结剂电池循环后LiFePO4结构变化较大。水性粘结剂的倍率性能良好,1C(C为充放电倍率)容量是0.1C的92.2%,而对于油性粘结剂,1C容量是0.1C的85.5%;水性体系中电极界面阻抗要小于油性体系中的界面阻抗,并且水性粘结剂电池的内阻要小于油性粘结剂的内阻。
The commercial LiFePO4 was used to produce full battery. The first discharge capacity, cycle performance, rate performance, and impedance of battery with water-binder battery and PVDF-binder battery were compared. The experiment indicates that the battery with PVDF-binder shows a higher capacity. The first discharge capacity is 124 mA·h/g. It also shows a good cycle performance, and the capacity retains 96.3% after 200 cycles. The battery with water-binder shows a good rate performance, and the ratio of 1C/0.1C is 92.2% compared with PVDF-binder battery＇s 85.5%. Impedance spectra analyses indicate that the impedance of cathode interface with water-binder is lower than that of cathode interface with PVDF-binder. And the impedance of battery with water-binder battery is lower than that with PVDF-binder.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第1期31-35,共5页
Journal of Central South University:Science and Technology
基金
国家重点基础研究资助项目(2007CB613607)
