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首页> 外文期刊>Advanced Powder Technology: The internation Journal of the Society of Powder Technology, Japan >Preparation, formulation and deposition of mica flake supported cobalt oxide for nanostructured lithium ion battery anodes
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Preparation, formulation and deposition of mica flake supported cobalt oxide for nanostructured lithium ion battery anodes

机译：云母薄膜支撑钴氧化物用于纳米结构锂离子电池阳极的制备，配方和沉积

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摘要

We describe the fabrication and morphological and electrochemical characterisation of lithium ion battery anodes whereby the active material is supported on flake-like microparticles. Using various physical analytical techniques we verify that nanostructured cobalt (II, III) oxide can be directly grown onto commercial titanium dioxide-coated mica flakes by a liquid phase oxidation route. We then investigate the formulation and deposition of this material along with carbon black in order to form electrodes. Here we consider two binder/solvent systems, one widely used based on polyvinylidene fluoride in N-methy-2-pyrrolidone, and one more recently identified based on sodium alginate in water. We show that the latter system is preferable for the formation of anodes using the cobalt oxide coated flake-like particles as it leads to a more homogeneous distribution of active and conductive material in the electrode. Using cyclic voltammetry and electrochemical impedance spectroscopy we show that this feature improves the access to active material and facilitates efficient charge transfer in the electrode while maintaining electrode integrity. Moreover, an electrode based on the alginate binder exhibited a high reversible specific capacity of 650 mAh/g along with 84.8% capacity retention after 70 cycles. Overall our study indicates the promise of including shape anisotropic particles such as microflakes in battery electrodes. (C) 2019 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
机译：我们描述了锂离子电池阳极的制造和形态学和电化学表征，由此在片状微粒上负载活性材料。使用各种物理分析技术，我们确认纳米结构钴（III，III）氧化物可以通过液相氧化途径直接生长到商业钛二氧化物涂覆的云母薄片上。然后，我们研究这种材料的配方和沉积以及炭黑以形成电极。在这里，我们考虑两个粘合剂/溶剂系统，一种基于N-甲基-2-吡咯烷酮的聚偏二氟乙烯广泛使用，并在水中基于藻酸钠最近鉴定。我们表明后一种系统优选使用氧化钴涂覆的片状颗粒形成阳极，因为它导致电极中的活性和导电材料的更均匀分布。使用循环伏安法和电化学阻抗光谱，我们表明该特征改善了对活性材料的进入，并有利于在保持电极完整性的同时在电极中有效电荷转移。此外，基于藻酸盐粘合剂的电极具有650mAh / g的高可逆比容量，并且在70次循环后容量保持84.8％。总体而言，我们的研究表明包括在电池电极中的形状各向异性颗粒等诸如微轧辊的承诺。 （c）2019年日本粉末技术学会。由elsevier b.v发表。和日本粉末科技会。版权所有。

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