Synthesis of LiCopo<sub>4</sub>Powders as a High-Voltage Cathode Material via Solvothermal Method

• 作者: Jianhuang Ke Kai Xie Yu Han
• 来源期刊: 电力能源(英文)
• 学科: 化学
• 关键词: Lithium Cobalt Phosphate SOLVOTHERMAL Synthesis HIGH-VOLTAGE Cathode LITHIUM-ION Batteries
• 年，卷（期）: 2017,（12）
• 页码范围: 21-27
• 页数: 7页
• 分类号: O6

摘要

Lithium cobalt phosphate (LiCoPO4, LCP), having a high operating potential (4.8 V vs. Li/Li+), a flat voltage profile and a good theoretical capacity (167 mAh/g), is considered a promising cathode material for improving the energy density of lithium-ion batteries (LIBs) [1] [2]. Here we report a category of method for synthesizing LCP, the solvothermal (ST) method with a binary solvent (deionized water: ethyl alcohol = 1:1), controlling the concentration of cobalt ion in 0.05 mol/L (ST-0.05) and 0.25mol/L (ST-0.25). The material phase was apparently identified via X-ray diffraction (XRD). Observed by scanning electron microscopy (SEM), the grain size of LCP powders synthesizing by solvothermal method with two kinds of the concentration of cobalt ion were 400 × 400 × 1000 nm cuboids (ST-0.05) and 150 × 150 × 250 nm hexagonal prisms containing nanoparticles (ST-0.25), respectively. Discharge capacities of LCP were 76.0 mAh/g (ST-0.05) and 94.5 mAh/g (ST-0.25), in the first cycle at 0.1 C, respectively.