Co-precipitation synthesis of nickel-rich cathodes for Li-ion batteries
Co-precipitation synthesis of nickel-rich cathodes for Li-ion batteries
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DOI：
10.1016/j.egyr.2022.06.110
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发表时间：
2022-07-13
期刊：
影响因子：
5.2
通讯作者：
Cussen, Serena A.
中科院分区：
文献类型：
--
作者：
Entwistle, Thomas;Sanchez-Perez, Enrique;Cussen, Serena A.
由于Ni2+离子在合成过程中对氧化的敏感性，制备富镍正极材料具有挑战性。因此，在制造LiNi0.8Mn0.1Co0.1O2 （NMC811）等富镍材料时，需要严格控制合成条件。用于金属氢氧化物前驱体合成的共沉淀步骤决定了二次粒子组装的形成，其中通常希望产生均匀的球形，类似于10 μ m直径的结构。搅拌槽式反应器常用于在惰性气氛中保持60℃的恒温和10.5 ~ 11.5的pH控制，以保持较高的Ni2+/Ni3+离子比。这促进了NMC氢氧化物前驱体(NixMnyCoz（OH)(2)）的形成，该前驱体通常用锂盐研磨并煅烧形成具有层状α - nafeo2晶体结构的LiNixMnyCozO2。本文概述了富镍层状阴极金属氢氧化物前驱体球形二次组件形成的一些关键合成参数。(C) 2022作者(s)。Elsevier Ltd.出版。
The preparation of Ni-rich cathode materials is challenging due to the Ni2+ ion sensitivity to oxidation during synthesis. The synthesis conditions during the manufacture of Ni-rich materials such as LiNi0.8Mn0.1Co0.1O2 (NMC811) therefore require stringent control. The co-precipitation step, applied in the synthesis of the metal hydroxide precursor, determines the secondary particle assembly formation, where it is typically desirable to produce uniform, spherical, similar to 10 mu m-diameter structures. A stirred tank reactor is often employed to maintain a constant temperature of 60 degrees C and a controlled pH of between 10.5 and 11.5 in an inert atmosphere to maintain a high Ni2+/Ni3+ ion ratio. This promotes the formation of an NMC hydroxide precursor (NixMnyCoz(OH)(2)) which is typically milled with a lithium salt and calcined to form LiNixMnyCozO2 with a layered alpha-NaFeO2 crystalline structure. This review outlines some of the critical synthetic parameters for the formation of spherical secondary assemblies of metal hydroxide precursors for nickel-rich layered cathodes. (C) 2022 The Author(s). Published by Elsevier Ltd.