Continuous production of LiCoO2 fine crystals for lithium batteries by hydrothermal synthesis under supercritical condition
Continuous production of LiCoO2 fine crystals for lithium batteries by hydrothermal synthesis under supercritical condition
复制标题
超临界条件水热合成连续生产锂电池用LiCoO2细晶
DOI：
10.1080/08957950108206185
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发表时间：
2001
影响因子：
2
通讯作者：
K. Arai
中科院分区：
文献类型：
--
作者：
Tadafumi Adschirib;Y. Hakuta;K. Kanamura;K. Arai
摘要综述了快速热流式超临界水热晶化合成（SHCS）的特点。该方法的吸引人的特征是（i）超细颗粒的定量生产，和（u）通过改变压力、温度或反应气氛（还原或氧化）来控制颗粒形态或晶体结构。在本研究中，我们使用该方法连续生产用作可充电锂离子电池正极材料的LiCoOz细晶体。选择LiOH和Co（NO2）2作为起始原料。为了将Co（II）氧化成Co（III），在预热管中分解H2 O2水溶液之后将O2引入反应器中。LiCoO 2颗粒在超临界条件下以单相形成。扫描电子显微照片显示粒径在500 - 1，000 nm直径范围内。通过恒电流放电和充电测试进行电化学表征。放电容量的小的降低表明通过该方法制备的LiCoOz晶体的高稳定性。
Abstract Specific features of supercritical hydrothermal crystallization synthesis (SHCS) by a rapid heating flow type method are reviewed. The attractive features of the method are (i) quantitative production of ultrafine particles, and (u) control of particle morphology or crystal structure by varying the pressure, temperature or reaction atmosphere (reducing or oxidizing). In this study, we use this method to continuously produce LiCoOz fine crystals that are used as for the cathode materials of rechargeable lithium ion batteries. LiOH and Co(NO& were chosen as starting materials. For oxidizing Co(II) to Co(III), O2 was introduced into the reactor after decomposing HzOz aqueous solution in a preheating tubing. LiCoO2 particles were formed in a single phase at supercritical conditions. scanning electron micrographs showed that the particle size was in the range of 500 to 1,000 nm in diameter. Electrochemical characterization was performed by a constant current discharge and charge test. Little decrease in the discharge capacity suggests high stability of the LiCoOz crystals prepared by this method.