Growth behavior of LiMn2O4 particles formed by solid-state reactions in air and water vapor
Growth behavior of LiMn2O4 particles formed by solid-state reactions in air and water vapor
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DOI：
10.1016/j.jssc.2016.08.033
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发表时间：
2016-11-01
影响因子：
3.3
通讯作者：
Naito, Makio
中科院分区：
文献类型：
--
作者：
Kozawa, Takahiro;Yanagisawa, Kazumichi;Naito, Makio
在没有任何添加剂的情况下，控制传统固态反应中形成的颗粒的形态是一项具有挑战性的任务。在此，我们提出了一种新的策略来控制LiMn2O4颗粒的形态，该策略基于固体反应中水蒸气诱导的颗粒生长。我们研究了LiMn2O4颗粒在空气和水蒸气气氛中的合成和微观结构演变作为模型反应；LiMn2O4被用作锂离子电池的低成本正极材料。用浸渍LiOH的球形MnCO3前驱体，在空气中得到空心结构的LiMn2O4球，在水蒸气中形成微米大小的角状颗粒。发现在水蒸气中合成的颗粒的孔隙结构在700℃以下受到影响。我们还表明，在水蒸气中进行固相反应是一种简单而有价值的方法，可以大规模生产颗粒，其中形状，大小和微观结构可以控制。(C) 2016 Elsevier Inc.版权所有。
Morphology control of particles formed during conventional solid-state reactions without any additives is a challenging task. Here, we propose a new strategy to control the morphology of LiMn2O4 particles based on water vapor-induced growth of particles during solid-state reactions. We have investigated the synthesis and microstructural evolution of LiMn2O4 particles in air and water vapor atmospheres as model reactions; LiMn2O4 is used as a low-cost cathode material for lithium-ion batteries. By using spherical MnCO3 precursor impregnated with LiOH, LiMn2O4 spheres with a hollow structure were obtained in air, while angulated particles with micrometer sizes were formed in water vapor. The pore structure of the particles synthesized in water vapor was found to be affected at temperatures below 700 degrees C. We also show that the solid-state reaction in water vapor is a simple and valuable method for the large-scale production of particles, where the shape, size, and microstructure can be controlled. (C) 2016 Elsevier Inc. All rights reserved.