TY - JOUR

T1 - Preparation, formulation and deposition of mica flake supported cobalt oxide for nanostructured lithium ion battery anodes

AU - Helmer, Alexandra

AU - Rink, Anna Sophie

AU - Esper, Julian

AU - Wu, Yanlin

AU - Bachmann, Julien

AU - Klupp Taylor, Robin N.

N1 - Publisher Copyright: © 2019 The Society of Powder Technology Japan Copyright: Copyright 2019 Elsevier B.V., All rights reserved.

PY - 2019/12

Y1 - 2019/12

N2 - 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.

AB - 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.

KW - Battery electrode

KW - Deposition

KW - Electrochemistry

KW - Formulation

KW - Particle coating

UR - http://www.scopus.com/inward/record.url?scp=85073758896&partnerID=8YFLogxK

U2 - 10.1016/j.apt.2019.09.020

DO - 10.1016/j.apt.2019.09.020

M3 - Article

AN - SCOPUS:85073758896

VL - 30

SP - 3127

EP - 3134

JO - Advanced Powder Technology

JF - Advanced Powder Technology

SN - 0921-8831

IS - 12

ER -