自组装CaCO_(3)模板法合成锂离子电池负极材料SnO_(2)@voids@C-SnO及改性研究  

Study on Synthesis and Modification of SnO_(2)@voids@C-SnO as Anode Material for Lithium-Ion Battery by Self-assembled CaCO_(3) Template Method

作　　者：郝熙娟 胡剑南 赵赫[1,2] 李建中 HAO Xi-juan;HU Jian-nan;ZHAO He;LI Jian-zhong(Key Laboratory for Ecological Metallurgy of Multimetallic Ores,Ministry of Education,Northeastern University,Shenyang 110819,China;School of Metallurgy,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学多金属共生矿生态化冶金教育部重点实验室,辽宁沈阳110819 [2]东北大学冶金学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2023年第3期363-369,共7页Journal of Northeastern University(Natural Science)

基　　金：国家重点研发计划项目(2019YFE0123900);国家自然科学基金资助项目(51974069);中央高校基本科研业务费专项资金资助项目(N2125035).

摘　　要：基于CaCO_(3)模板法制备出具有三维分级多孔碳骨架结构SnO_(2)@voids@C-SnO材料,并通过溶胶凝胶法进行Ni的添加.利用XRD和SEM对所得产物的晶体结构和微观形貌进行表征,并对电池进行电化学性能测试.结果表明,SnO_(2)@voids@C-SnO材料在电流密度50 mA·g^(-1)时首次放电比容量为1 092 mAh·g^(-1).添加Ni可以有效增加负极材料的比容量.当Ni质量分数达到25%时,材料的首次放电比容量达到1 414.6 mAh·g^(-1),70次循环后的放电比容量仍能保持617 mAh·g^(-1),倍率性能优良.这主要是因为Ni的添加在一定程度上避免了纳米粒子的团聚,缓解了体积膨胀带来的影响,明显改善了负极材料的电化学性能.A SnO_(2)@voids@C-SnO material with three-dimensional hierarchical-porous carbon skeleton structure was prepared by using CaCO_(3)as template. Then, Ni element was doped in the SnO_(2)@voids@C-SnO material by a sol-gel method. The crystal structure and morphology of the prepared sample were characterized by XRD and SEM, respectively, and the electrochemical performance of the above sample-based battery was tested. The results show that the first discharge specific capacity of the SnO_(2)@voids@C-SnO material at 50 mA· g^(-1)was 1 092 mAh· g^(-1). The specific capacity of the SnO_(2)@voids@C-SnO material can be effectively increased by Ni doping. A 25% Ni-doped material obtained the highest first discharge specific capacity of 1 414.6 mAh· g^(-1), and still had a higher discharge specific capacity of 617 mAh· g^(-1)after 70 cycles, the sample also showed high-rate performance. The increased particle dispersion after Ni doping was conducive to decreasing volume expansion, thus, endowing the Ni-doped SnO_(2)@voids@C-SnO material with high electrochemical properties.

关 键 词：SnO_(2) 负极材料 多孔 溶胶凝胶法 模板法 

分 类 号：TM912[电气工程—电力电子与电力传动]