2018-Sustainable Industrial Processing Summit
SIPS2018 Volume 9. Energy Production, Secondary Battery
| Editors: | F. Kongoli, H. Dodds, M. Mauntz, T. Turna, V. Kumar, K. Aifantis |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2018 |
| Pages: | 170 pages |
| ISBN: | 978-1-987820-98-0 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Crystal Growth of High-quality Lithium Metal Phosphates and Its Derivative by Using Flux Method
Tetsuya Yamada1; Katsuya Teshima1;1CENTER FOR ENERGY & ENVIRONMENTAL SCIENCE, SHINSHU UNIVERSITY, Nagano, Japan;
Type of Paper: Invited
Id Paper: 323
Topic: 14
Abstract:
Nowadays, improvement of functional materials is a sought after issue, with the aim of combining high-energy consumption and sustainable society. It is known that functionality of materials depends on crystallographic characteristics. Regarding to battery materials, ionic diffusion in bulk becomes easier by increasing specific surface area and improving crystallinity, whose ionic conductivity depends on crystal face. So, crystallographic controls of battery materials should be one of the crucial concerns to realize innovation in next-generation energy applications. Flux method is one of the crystal growth techniques in liquid phase. This technique enables us to achieve various crystallographic characteristics, in terms of crystallinity and morphology, such as size, shape, and also habits. We have studied flux growth of battery materials. So far, lots of unique and functionalized crystals have been grown. For example, polyhedron, cylinder, flower-type LiCoO<sub>2</sub> crystals are representative morphology. Since they have never been grown by other technique, we expected that flux method is a suitable method to improve battery by means of crystallography.
Recently, we are focusing on designing lithium metal phosphates and its derivative, formulated as Li<i>M</i>PO<sub>4</sub> and Li<sub>2</sub>MPO<sub>4</sub>F (<i>M</i>=Fe, Mn, Ni). Although they show poor conductivity, their electrochemical stability and high energy density are attractive advantages as active materials. We aimed to control crystal facets of Li<i>M</i>PO<sub>4</sub> and Li<sub>2</sub><i>M</i>PO<sub>4</sub>F, which exhibits higher conductivity, by using the flux method. As a result, we grew Li<i>M</i>PO<sub>4</sub> and Li<sub>2</sub><i>M</i>PO<sub>4</sub>F crystals with idiomorphic, high-crystalline natures. Some of them showed anisotropic morphology along to one direction, which may be typical due to flux method. In the SIPS2018 conference, we will report the flux growths, crystallographic characteristics, battery properties, and growth manners of a series of Li<i>M</i>PO<sub>4</sub> and Li<sub>2</sub><i>M</i>PO<sub>4</sub>F.