Synthesis and structural characteristics of LiCoO2 powders prepared by mechanical alloying of LiOH·H2O and Co(OH)2
Synthesis and structural characteristics of LiCoO2 powders prepared by mechanical alloying of LiOH·H2O and Co(OH)2
复制标题
LiOH·H2O与Co(OH)2机械合金化制备LiCoO2粉末的合成及结构特性
DOI：
10.1016/s0925-8388(00)01431-6
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
K. Lee
中科院分区：
文献类型：
--
作者：
W. Jeong;K. Lee
以氢氧化物LiOH·H2O和Co(OH)2为原料，采用机械合金化（MA）法制备了可充电锂电池用licoo2正极前驱体。将球磨前驱体在600℃的空气中焙烧2 h，得到了高结晶的ht - licoo2，与使用碳酸盐和氧化物的传统固相反应相比，焙烧条件大大改善。确定了机械合金化的最佳球磨条件。通过TG-DSC图和XRD图分析了粉末在不同工艺变量和烧成条件下的结构演变。为了在MA过程中更快地反应并降低随后的烧成温度和时间，有必要调整磨粉装置以去除脱水副产物，水和使用o2气氛。然而，作为一种新的合成锂嵌入氧化物和LiCoO2的方法，机械合金化的有效性已经得到了证明。
From the hydroxides LiOH·H2O and Co(OH)2as starting materials, the precursor of a LiCoO2cathode for lithium rechargeable batteries has been synthesized by mechanical alloying (MA). Highly crystallized HT–LiCoO2was obtained by subsequent firing of the ball milled precursor at 600°C for only 2 h in air, which were drastically improved firing conditions compared with the conventional solid state reaction using carbonates and oxides. The optimum ball milling conditions for mechanical alloying have been determined. The structural evolution of powders with various process variables and firing conditions was investigated by analysis of TG–DSC plots and XRD patterns. For faster reactions during the MA process and reduction of subsequent firing temperature and times, it is necessary to adjust the milling device for the removal of the byproduct of the dehydration, water, and the use of an O2atmosphere. However, as a new synthetic process of lithium-intercalation oxides as well as of LiCoO2, the effectiveness of mechanical alloying has been proved.