表面活性剂对LiNi_(0.8)Co_(0.1)Mn_(0.1)_O_(2)正极材料形貌和储锂性能的影响  

Effects of surfactants on the morphology and lithium storage performance of LiNi_(0.8)Co_(0.1)Mn_(0.1)_O_(2) cathode materials

作　　者：刘正科 杜浩 王尧尧 王北平[1,2] LIU Zheng-ke;DU Hao;WANG Yao-yao;WANG Bei-ping(School of Materials Science and Engineering,North Minzu University,Yinchuan 750021,China;Research Center of Silicon Target and Silicon-Carbon Negative Material Engineering Technology,Yinchuan 750021,China)

机构地区：[1]北方民族大学材料科学与工程学院,宁夏银川750021 [2]宁夏硅靶及硅碳负极材料工程技术研究中心,宁夏银川750021

出　　处：《中国有色冶金》2022年第5期8-14,共7页China Nonferrous Metallurgy

基　　金：国家级大学生创新训练项目(G202111407001);宁夏回族自治区重大研发计划项目(2020BCE01006)。

摘　　要：表面活性剂在材料合成时具有形貌控制方面的重要作用,为提高镍三元正极材料LiNi_(0.8)Co_(0.1)Mn_(0.1)_O_(2)的综合电化学性能,本文通过在正极材料前驱体Ni_(0.8)Co_(0.1)Mn_(0.1)(OH)_(2)合成过程中加入不同的表面活性剂来控制三元材料的形貌,并对煅烧后所得的高镍三元产物材料LiNi_(0.8)Co_(0.1)Mn_(0.1)_O_(2)进行形貌和电化学性能分析,结果表明:利用表面活性剂合成的产物材料有着更加规整的形貌和晶体结构稳定性;分别添加十二烷基苯磺酸钠、蔗糖、十六烷基三甲基溴化铵以及聚乙二醇之后,首次充电比容量分别可以达到232.2 mAh·g^(-1)、248.1 mAh·g^(-1)、231.3 mAh·g^(-1)以及216.1 mAh·g^(-1),其中十六烷基三甲基溴化铵的样品首次放电比容量达到193.9 mAh·g^(-1),且循环性能良好,这表明表面活性剂的辅助合成有利于材料的形貌控制与电化学性能的提高。Surfactants play an important role in morphology control during materials synthesis.In order to improve the comprehensive electrochemical performance of the high nickel ternary cathode material LiNi_(0.8)Co_(0.1)Mn_(0.1)_O_(2),the surfactants were used to control the morphology of the ternary material.Different surfactants were added in the synthesis process of the cathode material precursor Ni_(0.8)Co_(0.1)Mn_(0.1)(OH)_(2) to control the morphology of ternary materials,and then morphology and electrochemical performance of LiNi_(0.8)Co_(0.1)Mn_(0.1)_O_(2),the high nickel ternary product material obtained from calcining,were analyzed.The results show that the product materials synthesized by surfactants have more regular morphology and crystal structural stability.The electrochemical test shows that the specific capacity of the first charge can reach 232.2,248.1,231.3 and 216.1 mAh·g^(-1) after adding sodium dodecyl benzene sulfonate,sucrose,cetyltrimethylammonium bromide and polyethylene glycol.Among them,the first discharge specific capacity of cetyltrimethylammonium bromide reaches 193.9 mAh·g^(-1),and the cyclic performance is good,which indicates that the auxiliary synthesis of surfactants is beneficial to the morphology control and electrochemical performance improvement of materials.

关 键 词：锂离子电池 三元正极材料 表面活性剂 十二烷基苯磺酸钠 蔗糖 十六烷基三甲基溴化铵 聚乙二醇 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]