摘要
从合成与性能、结构分析与电化学反应机理、发展趋势等几个方面总结了近年来有关橄榄石型正极材料LiMPO4(M代表Mn、Fe、Co等金属离子)的研究进展。Li(MnyFe1―y)PO4是一单相固溶体,而当y>0.8时MnyFe1-yPO4 不稳定。Lix(Mn0.6Fe0.4)PO4有一个4.1 V的两相平台(0≤x ≤0.6, Mn3+/Mn2+)和3.5 V的单相平台(0.6≤x≤1.0, Fe3+/Fe2+),而LixFePO4只有一个3.4 V的两相平台。材料的粒径及其分布、导电能力和Fe3+的含量是影响产品性能的关键因素。利用惰性气氛、掺杂导电材料和制备粒度分布均匀的纳米粉体是获得性能优良的LiMPO4的有效方法。
Recent research progress on olivine LiMPO4, including its synthesis, structure, electrochemistry reaction mechanism, and the developing trend, was reviewed. Li(Mny Fe1-y )PO4 is a single-phase solid solution, but Mny Fe1―y PO4 is not stable as y>0.8. There are a flat two-phase region with an OCV of 4.1 V (region1: 0≤x≤0.6, Mn3+/Mn2+) and an S-curved single-phase region with an OCV of 3.5 V (region2: 0.6≤x ≤1.0, Fe3+/Fe2+) for the Liy (Mn0.6Fe0.4)PO4, but LixFePO4 only has a 3.4 V two-phase region. Particle size and its distribution, conductivity and the content of Fe3+ are the key factors affecting the performance of the samples. The use of inert gas, the addition of conductive fillers and the utilization of nano-powder can improve the performance of LiMPO4.
出处
《电源技术》
CAS
CSCD
北大核心
2004年第1期47-50,共4页
Chinese Journal of Power Sources
