摘要
锂离子正极材料主要集中在钴系、镍系、锰系、铁系。镍钴锰酸锂三元材料以其更低的制备成本和较好的电化学性能也引起了人们的广泛关注。目前对于三元材料的合成一般是先通过氢氧化物共沉淀法,在氨水的辅助下先合成前驱体,然后再经过高温烧结合成目标材料。这种前驱体合成方法对工艺参数要求高,较难稳定控制,并且氨水的使用对环境将造成污染。本文通过碳酸盐共沉淀法合成(Ni_(0.4)Co_(0.2)Mn_(0.4))CO_3前驱体来避免上述问题,并且通过合理的制备过程,以不同锂比合成Li_(1+x)Ni_(0.4)Co_(0.2)Mn_(0.4)O_(2+δ)材料。
The precursor(Ni_(0.4)Co_(0.2)Mn_(0.4))CO_3 for anode material was prepared by carbonate co-precipitation method.Adopting different molar ratio of Li to metal temary anode material Li_(1+x)Ni_(0.4)Co_(0.2)Mn_(0.4)O_(2+δ) was synthesized via high temperature calcination.The electrochemical performances of the anode materials synthesized based on different molar ratio of Li to metal were compared.The results showed that the obtained material has good performance when molar ratio of Li to metal was 1.07.The material has discharge capacity of 154.5mAh/g under the conditions of 25±5℃,2.75～4.2V and 0.2C.
出处
《精细与专用化学品》
CAS
2008年第14期11-12,23,共3页
Fine and Specialty Chemicals
基金
国家自然科学基金(50762004)
江西省教育厅项目(GJJ08269)
