Ni_(0.8)Co_(0.15)Al_(0.05)C_2O_4@石墨烯复合材料的合成及电化学性能研究  

Study on the Preparation and Electrochemical Performance of Ni_(0.8)Co_(0.15)Al_(0.05)C_2O_4@ Graphene Composites

作　　者：李艳萍[1,2] 高格 冯传启[3] 闫东伟[1,2] 周少雄[1,2] Li Yanping Gao Ge Feng Chuanqi Yan Dongwei Zhou Shaoxiong(China Iron ＆ Steel Research Institute Group, Beijing 100081 Research and Development Center, Advance Technology ＆ Materials Co. , Ltd, Beijing 10008 College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062)

机构地区：[1]钢铁研究总院,北京100081 [2]安泰科技股份有限公司研发中心,北京100081 [3]湖北大学化学化工学院,武汉430062

出　　处：《化学通报》2017年第11期1049-1054,共6页Chemistry

基　　金：国家863项目(2015AA034601);安泰科技股份有限公司技术创新项目(2013JA02PYF)资助

摘　　要：过渡金属复合物/石墨烯复合材料因其具有优异的电化学性能而被广泛应用在锂离子电池中。本文以硫酸镍、硫酸钴、硫酸铝、草酸为原料按一定的物质的量比配制成溶液,在120℃下水热反应12h,得到多元过渡金属复合草酸盐前驱体Ni_(0.8)Co_(0.15)Al_(0.05)C_2O_4(NCA-C_2O_4);该前驱体经聚烯丙基胺盐酸盐修饰后,与氧化石墨烯进行复合并还原得到石墨烯包覆的多元过渡金属复合草酸盐/石墨烯负极材料Ni_(0.8)Co(_0.15)Al_(0.05)C_2O_4@Graphene(NCA-C_2O_4@G)。对材料的结构、形貌和电化学性质进行了表征。扫描电镜测试结果显示样品粒度均一,具有两端不规则长方体形貌。电化学性能测试结果表明,NCA-C_2O_4@G充放电容量高于前驱体NCA-C_2O_4;0.1C电流密度(1C=1000m Ah/g)下,NCA-C_2O4@G首次放电比容量高达1956m Ah/g;经过0.1、0.2、0.5、1.0、2.0 C高倍率循环后,当测试电流密度恢复至100m A/g时,NCA-C_2O_4@G复合材料比容量可迅速回升至720m Ah/g,并在随后50次循环中比容量保持稳定,显示出良好的循环稳定性和倍率性能。Transition metal oxalate/graphene composites have excellent electrochemical performance which are widely used in lithium ion batteries. In this work,with the raw materials of NiSO4·6 H2O,CoSO4·7 H2O,Al2（SO4）3·18 H2O and H2C2O4 at a certain molar ratio prepared into solution,precursor Ni（0.8）Co（0.15）Al（0.05）C2O4 was obtained by hydrothermal reaction for 12 h under 120℃. Then transition metal oxalate/graphene composites Ni（0.8）Co（0.15）Al（0.05）C2O4@ Graphene were prepared by reduction of graphene oxide. And the structure,morphology and electrochemical properties of materials were characterized by X-ray diffraction（ XRD） and scanning electron microscope（ SEM）.SEM indicated that all the samples were cuboid with uniform size and irregular shape. Electrochemical test showed that the capacity of NCA-C2O4@ G was higher than that of NCA-C2O4. And the first discharge capacity of NCA-C2O4@ G composites at 0.1 C density is 1956 m Ah/g. After at 0. 1 C,0. 2 C,0. 5 C,1. 0 C,2. 0 C for cycles,the discharge capacity of composite material could be quickly increased to 720 m Ah/g when the test conditions recovered to 100 m A/g,and the capacity keeps stable in the subsequent 50 cycles. These indicated that as-prepared NCA-C2O4@ G composites have good electrochemical performance.

关 键 词：Ni0.8Co0.15Al0.05C2O4 水热法 过渡金属复合草酸盐 石墨烯 复合材料 

分 类 号：TM912[电气工程—电力电子与电力传动]