分散剂对负极及电池性能的影响  

Effect of dispersant on performance of anode and battery

作　　者：李保鹏 赵俊丽 常艳 蔡洪波 LI Baopeng;ZHAO Junli;CHANG Yan;CAI Hongbo(R&D Department,Henan Lithium Power Source Co.,Ltd.,Xinxiang Henan 453000,China)

机构地区：[1]河南锂动电源有限公司研发部,河南新乡453000

出　　处：《电源技术》2024年第10期1973-1979,共7页Chinese Journal of Power Sources

摘　　要：浆料的微观结构对电池性能起关键作用,因此改善浆料中各组分的分散状态以及阻止颗粒之间的团聚尤为重要。研究了不同含量的分散剂LD1对负极片以及电池倍率、低温、循环、高温自放电性能的影响,结果表明在负极浆料加入0.2%(质量分数)分散剂LD1,可以改善各组分的分散状态,提高浆料的稳定性。与未添加分散剂的浆料相比,涂布得到的负极片反弹率、面内阻、粘结力变化较小。用该极片制备的电池2.0 C充电后负极片界面良好,而未添加分散剂的电池负极片析锂;-20℃@0.5 C放电时,中值电压比未添加分散剂的电池高23 mV,-20℃@0.5 C充电恒流比从13.1%升高至80.0%;常温1.0 C循环2500次的容量保持率为81.4%,相比未添加分散剂的电池提高了34.0%;而且高温循环、高温自放电性能与未添加分散剂的电池无明显差异。此外,与添加0.2%(质量分数)分散剂PVP-K30进行对比,负极浆料中添加0.2%(质量分数)分散剂LD1更有利于提高电池倍率充电、高温循环性能。The slurry microstructure plays a key role in the battery performance.Therefore,it’s significant to improve the dispersion status of the ingredients and prevent the particle aggregation in the slurry.The effect of the dispersant LD1 concentration on the anode and the battery performance was studied,including ratio performance,low temperature performance,cycle performance and high temperature self-discharge performance.The results show that after adding 0.2%dispersant LD1 into the anode slurry,the dispersion status of the ingredients and the slurry stability improve.Compared with the slurry without the dispersant,the rebound rate,resistance and adhesion force of the coated anode has little change.The anode with 0.2%dispersant LD1 has a good interface after charging at 2.0 C,while the anode without the dispersant has lithium plating films.Discharging at-20℃@0.5 C,the medium voltage is 23 mV higher than that of the battery without the dispersant.The charge constant current ratio at-20℃@0.5 C increases from 13.1%to 80.0%.At room temperature,the capacity retention is 81.4%after 2500 cycles at 1.0 C,which is 34.0%higher than that of the battery without the dispersant.The high temperature cycle and high temperature self-discharge performance have no obvious difference.In addition,compared with adding 0.2%dispersant PVP-K30,adding 0.2%dispersant LD1 is more conducive to improving the performance of rate charging and high temperature cycle.

关 键 词：分散剂 负极浆料 电池 循环性能 容量保持率 

分 类 号：TM912.9[电气工程—电力电子与电力传动]