摘要
高镍三元正极材料LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)具有能量密度高和成本低的特点。有关高温固相法合成时多项实验条件变量对产物性能影响的研究不多。以镍钴锰氢氧化物为原料,采用高温固相合成法制备LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2),用热重(TG)-差示扫描量热(DSC)、XRD、SEM和粒度分析等方法,研究烧结温度、时间和过锂量对产物性能的影响。产物为球形,粒径均匀、结构稳定。电化学性能测试结果表明:在烧结温度为800℃、烧结时间为15 h及过锂量为5%的条件下合成的产物,性能最好。以0.2 C在2.50~4.30 V充放电,首次放电比容量达到212.2 mAh/g;在电流为1.0 C时,第100次循环的比容量从首次循环的187.9 mAh/g降至176.6 mAh/g,容量保持率为94.0%。
High energy density and low cost were the characteristics of nickel-rich cathode material LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2).Few attention had been attached to various experimental conditions on the performance of the product in high temperature solid-state synthesis.LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) was prepared by high temperature solid-state synthesis with nickel cobalt manganese hydroxide as raw material.The effects of sintering temperature,time and excess lithium amount on the performance of products were studied by thermogravimetry(TG)-differential scanning calorimetry(DSC),XRD,SEM and particle size analysis.Uniform particle size and stable structure had been achieved in the products.The electrochemical performance test results showed that the products synthesized at 800℃for 15 hours sintering time at an excess lithium amount of 5%had the best performance.The initial specific discharge capacity reached 212.2 mAh/g when charged-discharged at 0.2 C in 2.50-4.30 V.The specific capacity in the 100th cycle decreased from 187.9 mAh/g in the initial cycle to 176.6 mAh/g at the current of 1.0 C,with a capacity retention rate of 94.0%.
作者
李翔
戴林杉
彭金星
隋邦傑
LI Xiang;DAI Lin-shan;PENG Jin-xing;SUI Bang-jie(School of Automotive Engineering,Wuhan University of Technology,Wuhan,Hubei 430070,China;Institute of Electrochemical Energy Materials and Devices,Sichuan Energy Internet Research Institute Tsinghua University,Chengdu,Sichuan 610213,China)
出处
《电池》
CAS
北大核心
2022年第5期497-501,共5页
Battery Bimonthly
作者简介
李翔(1997-),男,江苏人,武汉理工大学汽车工程学院硕士生,研究方向:锂离子电池正极材料;戴林杉(1979-),女,四川人,清华四川能源互联网研究院电化学能源材料与器件研究所高级工程师,硕士,研究方向:锂离子电池材料及超级电容器;彭金星(1998-),女,四川人,武汉理工大学汽车工程学院硕士生,研究方向:锂离子电池正极材料回收建模与仿真;通信作者:隋邦傑(1964-),男,中国台湾省人,武汉理工大学汽车工程学院教授,研究方向:热传递现象与电化学。
