CTAB辅助水热合成高镍三元材料LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)及其高低温性能研究  

High-low Temperature Properties of Ni-rich LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2) Cathode Material by Hydrothermal Synthesis with CTAB Assisted

作　　者：张会双 高延晓[2,3] 王秋娴 李向南 刘文凤[1,3,4] 杨书廷 ZHANG Huishuang;GAO Yanxiao;WANG Qiuxian;LI Xiangnan;LIU Wenfeng;YANG Shuting(School of Physics,Henan Normal University,Xinxiang 453007,China;School of Chemistry and Chemical Engineering Science,Henan Normal University,Xinxiang 453007,China;Collaborative Innovation Center of Henan Province for Motive Power and Key Materials,Xinxiang 453007,China;Henan Battery Research Institute,Xinxiang 453007,China)

机构地区：[1]河南师范大学物理学院,新乡453007 [2]河南师范大学化学化工学院,新乡453007 [3]动力电源及关键材料河南省协同创新中心,新乡453007 [4]河南电池研究院有限公司,新乡453007

出　　处：《高等学校化学学报》2021年第3期819-826,共8页Chemical Journal of Chinese Universities

基　　金：河南省重点科技攻关项目(批准号:182102310827);河南省高等学校重点科研项目(批准号:20B430009);新乡市科技发展规划项目(批准号:15GY02)资助.

摘　　要：以醋酸盐为原料,以十六烷基三甲基溴化铵(CTAB)为分散剂,通过水热合成-高温烧结的方法制备高镍三元正极材料LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2).结果表明,适量分散剂CTAB的加入可有效调节材料的颗粒形貌尺寸,降低锂镍混排,改善材料的电化学性能.加入2%(质量分数)CTAB时,制备的电池材料具有完整有序的层状结构,且颗粒均匀分散,具有最佳的循环性能和高低温性能.该材料在室温及倍率1C下循环100次后,容量保持率为88.5%.在‒20,25和55℃条件下及倍率0.1C充放电时,首次放电比容量分别为60.3,168.5和207.2 mA·h/g.Using acetate as raw material,cetyltrimethyl ammonium bromide(CTAB)as dispersing agent,LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2) cathode material was synthesized by hydrothermal method after high temperature two-step sintering.The experiments proved that proper addition of the dispersant CTAB can effectively adjust the parti⁃cle morphology,reduce Ni2+/Li+cation mixing and improve the electrochemical properties of the material.When 2%(mass fraction)CTAB was added,the LNi0.6Co0.2Mn0.2O2 cathode material had an ordered layered structure and the particles of the material were homogeneous and dispersed.Furthermore,and the optimal cy⁃cling performance and the high-low temperature performance were obtained.The retention rate of the material was 88.5%after 100 cycles in the voltage range of 3.0—4.3 V at a rate of 1C and 25℃.The initial discharge specific capacity were 60.3,168.5 and 207.2 mA·h/g,respectively,at a rate of 0.1C under the environmental conditions of‒20,25 and 55℃,which provided a strong basis for the wider application of the material.

关 键 词：高镍正极材料 水热合成 分散剂 高低温性能 

分 类 号：O646[理学—物理化学]