注液量对金属氢化物-镍电池的影响  

Effect of electrolyte amount on metal hydride-nickel battery

作　　者：徐津 李宝犬 王利[1,2,3] 闫慧忠 XU Jin;LI Bao-quan;WANG Li;YAN Hui-zhong(State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization,Baotou,Nei Mongol 014030,China;National Engineering Research Centre of Rare Earth Metallurgy and Functional Materials,Baotou,Nei Mongol 014030,China;Inner Mongolia Key Laboratory of Rare Earth Functional Materials,Baotou,Nei Mongol 014030,China)

机构地区：[1]包头稀土研究院白云鄂博稀土资源研究与综合利用国家重点实验室,内蒙古包头014030 [2]稀土冶金及功能材料国家工程研究中心,内蒙古包头014030 [3]内蒙古自治区稀土功能材料重点实验室,内蒙古包头014030

出　　处：《电池》2020年第6期543-546,共4页Battery Bimonthly

基　　金：国家自然科学基金项目(51961002);科技部国际科技合作重点项目(2018YFE0124400);内蒙古自然科学基金项目(2018MS05016);内蒙古自治区科技计划项目(2020B2155);内蒙古自治区科技成果转化专项项目(2020B2156);北方稀土科技项目(BFXT-2019-D-003)。

摘　　要：以市售A 2B 7型La-Mg-Ni系储氢合金为负极材料,制作不同注液量的AA1500型金属氢化物-镍(MH/Ni)电池,研究电池的放电容量、内阻、自放电、循环寿命和过充性能等。随着注液量的增加,电池0.2 C倍率容量先逐渐升高后保持不变,注液量为3.0 g时,最高达到1648.2 mAh;电池的内阻随注液量的增加逐渐降低,从注液量为2.4 g时的14.89 mΩ降低至注液量为3.2 g的13.36 mΩ,但0.2 C倍率放电中值电压均保持在1.228 V;电池在55℃储存7 d后,荷电保持率随着注液量的增加先提高、后降低,注液量为2.8 g时最高,为81.87%;循环性能也具有相同的趋势,循环100次容量保持率的最高值为77.64%。测试极组中的水分含量,发现,水分含量的减少是循环寿命缩短的主要原因。AA1500-type metal hydride-nickel(MH-Ni)batteries with different electrolyte amounts were prepared with commercially A 2B 7 type La-Mg-Ni hydrogen storage alloy as anode material.The performance such as discharge capacity,internal resistance,self-discharge,cycle performance and overcharge of the batteries was studied.The capacity of the battery at 0.2 C rate increased firstly and then remained constant,reached the maximum(1648.2 mAh)when the electrolyte amount was 3.0 g.The internal resistance of the battery decreased gradually from 14.89 mΩto 13.36 mΩwhen the electrolyte amounts increased from 2.4 g to 3.2 g,but the discharge median voltage at 0.2 C rate was kept at 1.228 V.The state of charge retention rate increased firstly and then decreased with the increase of electrolyte amounts after battery stored at 55℃for 7 d,the highest was 81.87%when the electrolyte amounts was 2.8 g.The cycle performance showed the same trend,the highest capacity retention rate after 100 cycles was 77.64%.The water content of the pole group was tested.It was found that the decrease of water content was the main reason for the shorten of cycle life.

关 键 词：金属氢化物-镍(MH/Ni)电池 电解液 容量 自放电 循环寿命 

分 类 号：TM912.2[电气工程—电力电子与电力传动]