Effects of Precursor Preparation Methods on the Electrical Properties of Cathode Materials for Lithium Ion Batteries

Yong Zhao, Zou, Shuai Liu
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Abstract

Four kinds of p recursor powders were synthesized from hydroxide coprecipitation and carbonate coprecipitation method s , then the LiNi 1/3 Mn 1/3 Co 1/3 O 2 was prepared by high temperature calcination, and the precipitating agents were sodium bicarbonate, sodium hydroxide (forward and reverse), sodium hydroxide and ammonia. The effects of precur sor preparation methods on the electrical properties of cathode materials for lithium ion batteries were systematically investigated by means of X ray diffraction, scanning electron microscopy and electrochemical performance measurements. The results showe d that the LiNi 1/3 Mn 1/3 Co 1/3 O 2 particles obtained by carbonate co precipitation method were spherical, and the morphology of the precipitated product was similar to that obtained by sodium hydroxide and ammonia. In the voltage range of 3– 4.3 V, the delivered discharge capacities of 1- 1, 1- 2, 1- 3 and 1- 4 at 1C were 147.0, 145.8, 140.2, 138.1 mAh g- 1, respectively. After 50 cycles, the capacity retention ratios were 92%, 89.9%, 85.2%, and 82.1%, respectively.
前驱体制备方法对锂离子电池正极材料电性能的影响
采用氢氧共沉淀法和碳酸盐共沉淀法合成了四种反相粉末,然后采用高温煅烧法制备了LiNi 1/3 Mn 1/3 Co 1/3 o2,沉淀剂为碳酸氢钠、氢氧化钠(正向和反向)、氢氧化钠和氨水。采用X射线衍射、扫描电镜和电化学性能测试等方法系统研究了前驱体制备方法对锂离子电池正极材料电学性能的影响。结果表明:碳酸盐共沉淀法得到的LiNi 1/3 Mn 1/3 Co 1/3 o2颗粒呈球形,沉淀物的形貌与氢氧化钠和氨水法得到的形貌相似。在3 ~ 4.3 V电压范围内,1- 1、1- 2、1- 3和1- 4在1C下的放电容量分别为147.0、145.8、140.2、138.1 mAh g- 1。循环50次后,容量保持率分别为92%、89.9%、85.2%和82.1%。
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