Role of coprecipitation and calcination of precursors on phase homogeneity and electrochemical properties of battery active materials
Role of coprecipitation and calcination of precursors on phase homogeneity and electrochemical properties of battery active materials
复制标题
DOI：
10.1016/j.powtec.2018.05.020
复制
发表时间：
2018-07-15
影响因子：
5.2
通讯作者：
Koenig, Gary M., Jr.
中科院分区：
文献类型：
--
作者：
Dong, Hongxu;Wang, Anny;Koenig, Gary M., Jr.
先前已经证明共沉淀产生电池前体颗粒的不同组成，通常假设过渡金属从溶液中的沉淀导致关于过渡金属阳离子在固体颗粒内的有效均匀局部混合的优点。这种混合通常被认为是相对于具有相等起始化学计量的固体粉末的固态反应的优点;然而，很少有研究试图定量地证实这种局部混合对所得最终材料的影响。共沉淀的局部混合在多大程度上促进了煅烧过程中过渡金属的传质，这将有助于产生结晶良好的单相颗粒，目前尚不清楚。在此，本研究将系统地比较由过渡金属的共混物组成的氧化物粉末的相纯度和结晶度，所述过渡金属的共混物由单一过渡金属前体或通过从溶液共沉淀产生的多组分前体的物理混合物产生。这些实验为通过沉淀实现的局部混合在形成具有所需相的高结晶度最终材料中所发挥的作用提供了定量支持。LiMn1.5Ni0.5O4在煅烧后用作模型多组分靶最终材料。(C)2018爱思唯尔B. V.保留所有权利。
Coprecipitation has previously been demonstrated to produce diverse compositions of battery precursor particles, frequently under the assumption that the precipitation of transition metals from the solution results in advantages with regards to efficient homogeneous local mixing of transition metal cations within the solid particles. Such mixing is generally considered as an advantage relative to solid state reaction of solid powders with the equivalent starting stoichiometry; however, very few studies have attempted to quantitatively confirm the impact of this local mixing on the resulting final materials. The extent to which local mixing from coprecipitation facilitates the mass transport of transition metals during the calcination process, which would be expected to aid in producing well crystallized single-phase particles, is not clear. Herein, this study will systematically compare the phase purity and crystallinity of oxide powders comprised of a blend of transition metals that were produced from either physical mixture of single transition metal precursors or multicomponent precursors produced via coprecipitation from solution. These experiments provide quantitative support for the role that local mixing, achieved via precipitation, plays in forming high crystallinity final materials with the desired phase. LiMn1.5Ni0.5O4 was used as a model multicomponent target final material after calcination. (C) 2018 Elsevier B.V. All rights reserved.