(中國科學(xué)院 金屬研究所
金屬腐蝕與防護(hù)國家重點(diǎn)實驗室, 沈陽 110016)
摘 要: 采用Pechini法在800℃空氣中焙燒6h制備LiNixMn2-xO4試樣(x = 0, 0.05, 0.1, 0.2, 0.3, 0.4,0.5)。 經(jīng)XRD測試表明除LiNi0.5Mn1.5O4以外,其它的試樣均為純凈的尖晶石結(jié)構(gòu)。 尖晶石LiNixMn2-xO4試樣電極在3.3~4.5V以及4.5~4.8V范圍內(nèi)的電化學(xué)性能測試表明:在3.3~4.5V范圍內(nèi), 試樣初始充放電容量隨Ni元素?fù)诫s比例的增加而降低;在4.5~4.8V范圍內(nèi), 試樣初始充放電容量隨Ni元素?fù)诫s比例的增加而增大;在3.3~4.8V范圍內(nèi), 試樣總的初始容量基本不變; 在3.3~4.5V范圍內(nèi),試樣的循環(huán)性能隨Ni元素?fù)诫s比例的增加而提高。
關(guān)鍵字: 尖晶石型LiNixMn2-xO4; 正極材料; 二次鋰離子電池
(State Key Laboratory for Corrosion and Protection, Institute of Metal Research, The Chinese Academy of Sciences,Shenyang 110016, China)
Abstract:LiNixMn2-xO4(x=0, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5)were prepared by Pechini method at 800℃ in air for 6h. All compounds show a single phase except for LiNi0.5Mn1.5O4 based on the XRD. The initial charge and discharge capacity of LiNixMn2-xO4 decrease with increase of substituted Ni content in 3.3~4.5V range; but increase with increase of substituted Ni content in 4.5~4.8V range. The total first charge and discharge capacity of LiNixMn2-xO4 are basically unchanged in 3.3~4.8V range. The cycle performance is enhanced with increase of substituted Ni content.
Key words: spinel LiNixMn2-xO4; cathode material; lithium-ion battery


