SYNTHESIS AND ELECTROCHEMICAL STUDIES OF LIMNO2 PREPARED OF LOW-TEMPERATURES
SYNTHESIS AND ELECTROCHEMICAL STUDIES OF LIMNO2 PREPARED OF LOW-TEMPERATURES
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DOI：
10.1149/1.2221101
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发表时间：
1993-12-01
影响因子：
3.9
通讯作者：
DAHN, JR
中科院分区：
文献类型：
--
作者：
REIMERS, JN;FULLER, EW;DAHN, JR
一种新形式的LiMnO2，最近被证明可以可逆地嵌入锂，与其他流行的锂离子电池正极材料相比具有许多优势。我们描述了以前报道的低温(300-450℃)合成的改进，并报告了一种新的基于离子交换的合成路线，该路线在100℃进行，电化学性能强烈依赖于合成温度。原位X射线衍射和长时间循环测量表明，当Li从LiMnO2中去除时，发生了向无序尖晶石的不可逆结构转变。然而，在2.5~4.2V之间，该材料的比容量超过190mAh/g。
A new form of LiMnO2, which has recently been shown to reversibly intercalate lithium, has many advantages over other popular lithium-ion battery cathode materials. We describe improvements in the previously reported low temperature(300-450 degrees C) synthesis and report a new synthesis route based on ion exchange which takes place at 100 degrees C. Electrochemical performance is shown to be strongly dependent on synthesis temperature. In situ x-ray diffraction and long time cycling measurements indicate that an irreversible structural transformation to disordered spinel takes place when Li is removed from LiMnO2. Nevertheless, the specific capacity of this material is over 190 mAh/g between 2.5 and 4.2 V.