National Institute of Advanced Industrial Science and Technology, Umezono 1-1-1, Tsukuba, Ibaraki, 305-8578 Japan.
ACS Nano. 2010 Feb 23;4(2):741-52. doi: 10.1021/nn9012065.
The effect of crystallite size on Li-ion insertion in electrode materials is of great interest recently because of the need for nanoelectrodes in higher-power Li-ion rechargeable batteries. We present a systematic study of the effect of size on the electrochemical properties of LiMn(2)O(4). Accurate size control of nanocrystalline LiMn(2)O(4), which is realized by a hydrothermal method, significantly alters the phase diagram as well as Li-ion insertion voltage. Nanocrystalline LiMn(2)O(4) with extremely small crystallite size of 15 nm cannot accommodate domain boundaries between Li-rich and Li-poor phases due to interface energy, and therefore lithiation proceeds via solid solution state without domain boundaries, enabling fast Li-ion insertion during the entire discharge process.
最近，由于需要在高功率锂离子可再充电电池中使用纳米电极，晶粒尺寸对锂离子在电极材料中嵌入的影响引起了极大的关注。我们对尺寸对 LiMn(2)O(4)电化学性能的影响进行了系统的研究。通过水热法实现的纳米晶 LiMn(2)O(4)的精确尺寸控制显著改变了相图以及锂离子插入电压。由于界面能，具有极其小的晶粒尺寸 15nm 的纳米晶 LiMn(2)O(4)不能容纳富锂相与贫锂相之间的畴界，因此锂化通过固溶态进行而没有畴界，使得在整个放电过程中能够快速插入锂离子。
