Synthesis of electrochemically active LiCoO2 and LiNiO2 at 100 degrees C
Synthesis of electrochemically active LiCoO2 and LiNiO2 at 100 degrees C
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DOI：
10.1016/0167-2738(96)00031-8
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发表时间：
1996-04-01
影响因子：
3.2
通讯作者：
Klein, LC
中科院分区：
文献类型：
--
作者：
Amatucci, GG;Tarascon, JM;Klein, LC
目前，LiCoO2的制造需要在850摄氏度到1000摄氏度的温度下进行一到两天的煅烧和退火。本文表明，通过在CoOOH和过量的LiOH之间进行为期两天的离子交换反应，可以在低至100℃的温度下制备LiCoO2粉末。H2O。通过x射线衍射、热重和红外分析对所得LiCoO2粉末进行了研究。低温制备的LiCoO2粉末结晶良好，晶格参数与850℃制备的样品一致。样品的红外光谱与LiCoO2相似，但是，微弱的额外谱线表明碳酸盐和羟基物质的存在。这些物质的存在严重影响了电化学插层反应的容量和可逆性。在250摄氏度左右的中等温度下加热这些粉末，可以有效地去除这些物质，并大大提高它们的电化学循环性能。同样的离子交换反应成功地应用于LiNiO2的合成。
Presently, fabrication of LiCoO2 requires calcination and annealing at temperatures ranging from 850 degrees C to 1000 degrees C from one to two days. Herein we show that LiCoO2 powders can be prepared at temperatures as low as 100 degrees C through the use of a two days ion exchange reaction between CoOOH and an excess of LiOH . H2O. The resultant LiCoO2 powders were studied through the use of X-ray diffraction, thermal gravimetry, and infrared analysis. Low-temperature fabricated LiCoO2 powders were well crystallized with lattice parameters agreeing with 850 degrees C prepared samples. The samples had an infrared spectrum similar to that of LiCoO2 with, however, weak extra lines indicating the presence of both carbonate and hydroxyl species. The presence of these species was found to severely affect both the capacity and reversibility of the electrochemical intercalation reactions. Heating these powders at moderate temperatures, around 250 degrees C, was effective in removing the species and drastically improving their electrochemical cycling properties. The same ion exchange reaction was successfully applied to the synthesis of LiNiO2.