Preparation of LiFePO4 Composite Cathode Material and Performance Analysis

• Main Authors: Pao-Chia Chung, 鍾嘉寶
• Other Authors: Hui-Jean Chiang
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/31716386724887233983

碩士 === 國立新竹教育大學 === 應用科學系碩士班 === 99 === In this project, we use ferrous sulfate / hydrogen peroxide and phosphoric acid / ammonia as the starting materials to produce iron phosphate precipitates under pH value in 2. After mixing with lithium carbonate in a certain percentage, the precursors were sintered at 700℃ in nitrogen. Then we obtained the crystal-like good olivine lithium iron phosphate. We also added different dispersants / iron phosphate coating agent in the precipitation process, to study the influence of electric properties of products. The results indicated: the selected dispersant, can achieve a well dispersion, particle size in 100nm for all products. When adding PEI as the coating agent, the electric capacity of products can be improved. But if adding PEI coating agent with the dispersant in the same time, they did not necessarily obtain a better effect. Only in case of NSFC with PEI can be best, capacitance up to 141 mAh/g.