摘要
通过添加烷基季铵盐类表面活性剂来调控材料形貌和粒径的改性方法,在LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)前驱体合成过程中添加表面活性剂十二烷基三甲基溴化铵(DTAB)和十六烷基三甲基溴化铵(CTAB),利用尿素作为配合剂和沉淀剂,采用溶剂热法合成LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)前驱体。最后,高温混锂煅烧合成椭球形的空心多孔材料。相比于不添加表面活性剂的样本,改性的材料有着更小的粒径和更加规整的形貌。电化学测试表明,添加DTAB和CTAB之后,首次充电容量分别达到223与251 mAh·g^(-1)(0.1C)。其中,添加CTAB的样品首次放电容量达到216 mAh·g^(-1)(0.1C),100次循环后容量保持率为85.1%,高于LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)的81.7%(0.1C)。表面活性剂的改性显著提高了材料的电化学性能,为高镍三元正极材料的改性提供了一种新的思路。
Herein,a modification method was proposed to control the morphology and particle size of materials by adding alkyl quaternary ammonium salt surfactant.In the synthesis process of LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)precursor,the surfactant dodecyl trimethyl bromide(DTAB)and hexadecyl trimethyl bromide(CTAB)were added;the LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)precursor was synthesized by using urea as compounding agent and precipitation agent and the solvent heat method as the synthesis method.Finally,hollow porous materials with ellipsoidal shape were synthe-sized by high temperature calcination of mixed lithium.Compared with blank samples without surfactant,the materi-als modified by surfactant had smaller particle size and more regular morphology.Electrochemical test showed that the initial charging capacity reached 223 and 251 mAh·g^(-1)respectively after adding DTAB and CTAB.Among them,the initial discharge capacity of adding CTAB reached 216 mAh·g^(-1)(0.1 C),and the capacity retention rate was 85.1%after 100 cycles,higher than 81.7%(0.1 C)of LNCM811.The modification of surfactants significantly improves the electrochemical properties of the materials and provides a new perspective for the modification of high nickel ternary anode materials.
作者
同佳欣
王娟
黄会星
TONG Jia-Xin;WANG Juan;HUANG Hui-Xing(School of Mechanical and Electrical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;Shaanxi Provincial Key Laboratory of Nanomaterials and Technology,Xi'an 710055,China)
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2021年第5期835-843,共9页
Chinese Journal of Inorganic Chemistry
基金
陕西省自然科学基金(No.2018GY-166,2019TD-019,2019TSLGY04-01)
西安市自然科学基金(No.201805033YD11CG17(7))
西安市清洁能源重点实验室(No.2019219914SYS014CG036)资助。
