软化学法低温合成钴酸锂的研究

STUDY ON LITHIUM-COBALT OXIDE SYNTHESIZED BY SOFT CHEMISTRY METHOD

采用软化学法合成钴酸锂（ＬＩｘＣｏＯ２）并对产物进行ＸＲＤ，ＳＥＭ，ＩＲ，ＸＰＳ及ＩＣＰ测试．结果表明，与固相法相比，该法具有烧结温度低（５００℃），烧结时间短（４ｈ）的优点．对用ＬｉＣｏＯ２微粉作正极活性物质组成的Ｌｉ／ＬｉｚＣｏＯ２电池进行电化学测试结果表明，电池充电电压可达 ４．５Ｖ（ｖｓ，Ｌｉ），第一次充电比容量为１４６ｍＡ·ｈ·ｇ－１，循环２５周后的放电比容量为１３５ｍＡ·ｈ·ｇ－１，终止电压３．０Ｖ（ｖｓ，Ｌｉ），容量损失为７．５％．

LiCoO2 Powders had been synthesized by soft chemistry method. The products were measured by XRD, SEM, IR, XPS and ICP, the results come to the conclusion that this is a good method with low sintering temperature of 500C and with short sintering the of 4h comparing to the traditional sintering method. The electrochemistry tests using Li/LiCoO2 cell with LiCoO2 as active cathode materials show that the change voltage is 4.4V (vs. Li), the first charge capacity is 146mA. h. g-1,the discharge capacity is 135mA· h· g-and capacity loss is 7. 5% after 25 cycles,cut off voltnge is 3. 0V(vs Li).