LixNiO2—锂电池阴极材料

高温固相反应法在Li—Ni—O体系中成功地合成了具有层状结构的Li_xNiO_2,固溶体区间为0.45≤x≤0.98;用XRD,XPS等技术研究了它们的结构和金属离子Ni的存在价态,用恒电流间断滴定法测得了Li~+在Li_xNiO_2中的化学扩散系数和离子电导率,室温下(?)_i和σ_i分别为10~(-9)cm~2/s和10~(-5)S/cm量级,试验电池充放电实验表明,Li_xNiO_2是有前途的锂电池阴极材料。

Li_xNiO_2——A Cathode Material for Lithium Batteries

A lithium-nickel oxide Li_xNiO_2 (0.45≤x≤0.98) has been prepared by heating a pelletized mixture of LiOH·H_2O and Ni_2O_3 in air and examined by using XRD, IR and XPS techniques. Structural analyses prove that the Li_xNiO_2 exhibits the typical layered structure isotypic with ideal LiNiO_2. The chemical diffusion coefficient and the partial conductivity of Li~+ in Li_xNiO_2 were obtained by the galvanostatic intermittent titration technique (GITT) and have values of 10~(-9) cm~2·s~(-1) and 10~(-5) S·cm~(-1) at room temperature, respectively. Typical charge-discharge curves of the test cells Li/Li_xNiO_2, which exhibit high discharge voltage and specific capacity as well as good reversibility, demonstrate that the Li_xNiO_2 are a prospective cathode material.