ORALS

SESSION: BatteryMonPM2-R9	5th Intl. Symp. on Sustainable Secondary Battery Manufacturing and Recycling
Mon Nov, 5 2018 / Room: Asian (60/3rd)
Session Chairs: Thierry Djenizian; Vimalnath Selvaraj; Session Monitor: TBA

15:55: [BatteryMonPM209] Invited
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;
Paper Id: 323 [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 LiCoO₂ 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>PO₄ and Li₂MPO₄F (<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>PO₄ and Li₂<i>M</i>PO₄F, which exhibits higher conductivity, by using the flux method. As a result, we grew Li<i>M</i>PO₄ and Li₂<i>M</i>PO₄F 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>PO₄ and Li₂<i>M</i>PO₄F.

SESSION: BatteryMonPM2-R9	5th Intl. Symp. on Sustainable Secondary Battery Manufacturing and Recycling
Mon Nov, 5 2018 / Room: Asian (60/3rd)
Session Chairs: Thierry Djenizian; Vimalnath Selvaraj; Session Monitor: TBA

17:10: [BatteryMonPM212] Keynote
Flux-Crystal Growth Engineering Toward Next-generation Batteries: Electrode Material and Interfacial Designs
Katsuya Teshima¹ ; Tetsuya Yamada¹ ; Shuji Oishi² ; Nobuyuki Zettsu¹ ; ¹Center for Energy & Environmental Science, Shinshu University, Nagano, Japan; ²Center for Energy & Environmental Science, Shinshu University, Nagano, Japan;
Paper Id: 322 [Abstract]

Lithium ion secondary batteries (LIBs) have been widely used as energy-storage systems for a variety of power devices. It is necessary to further develop LIBs toward high-functional devices, such as electric vehicles and mobile electronics. Nowadays, all solid-state LIBs have been of much interest because of high energy densities and high level of safety. All solid-state LIBs provide many advantages in terms of size, flexibility, cost, and performance. However, there are serious problems to be solved toward practical uses. For example, diffusion of lithium ions at the interface between different solid materials is still poor for operating charge/discharge in batteries. Our group has studied high-quality crystals for applications as energy and environmental materials by using a flux method. Flux method is a nature-mimetic liquid-phase crystal growth technique. It is possible to construct molten reaction field at any temperature with facile setup and give designed crystals shape, including crystal faces, which has never been achieved using other methods like solid state reaction. Recently, we have applied the flux technique to battery materials to create "all-crystal (solid)-state LIBs". We have expected that flux crystal growth gave (I) crystal-shape control of active materials, (II) construction of good interfaces in electrodes among cathodes, solid electrolytes, and anodes. As a result, smooth ionic transportation through bulks and their interfaces would be realized in all-crystal (solid)-state LIBs. Our concept using flux method would provide new aspect to make innovation in all solid state LIBs as next-generation energy storage. The details of interfacial and crystal designs of battery materials will be introduced in the SIPS2018 conference.