摘要
为合成性能良好的负极材料四氧化三钴,用硫酸钴作为钴源,氢氧化钠做沉淀剂,聚乙烯吡络烷酮(PVP)为表面活性剂,利用液相沉淀法合成了粒度均匀的四氧化三钴颗粒;对钴盐浓度、PVP用量和煅烧温度等参数进行考查并对其电化学性能进行了表征.结果表明:当钴盐浓度为0.5mol/L,PVP用为50%(质量分数)时,可获得分散均匀,形貌良好的氢氧化钴颗粒;在煅烧温度为700℃时,可以获得纯净的粒径为3μm左右的片状四氧化三钴晶体颗粒.充放电实验表明,该材料在2V附近有放电平台,首次放电比容量可以达到1 500mAh/g,且在循环15次后,容量保持率在90%以上.
To make excellent performance cobalt oxide anode materials,the cobalt oxide was synthesized by liquid precipitation method using cobalt sulfate as cobalt source and hydroxide as precipitant.The chemical properties of concentration of cobalt sulfate solution,the mount of PolyVinyl Pyrrolidone （PVP） and calcining temperature were characterized.And the electrochemical performance of synthesized materials was characterized by electrochemical performance measurement.Results show that cobalt hydroxide with uniform particle size distribution is obtained when the concentration of cobalt sulfate solution is 0.2 mol/L and PVP is 50％ ; the sheetlike cobalt oxide is obtained at calcining temperature of 700 ℃ and its size is about 3 μm.The initial discharge capacity of the cobalt oxide is 1 500 mAh/g and the discharge capacity rethtion ratio is above 90％ after 15 cycles.
出处
《武汉工程大学学报》
CAS
2014年第4期7-11,共5页
Journal of Wuhan Institute of Technology
基金
国家重点实验室基金(SKL-SPM-201211)
关键词
四氧化三钴
负极材料
液相沉淀
电化学性能
cobalt oxide
anode materials
liquid precipitation method
electrochemical performance
