成果報告書詳細
管理番号20130000000283
タイトル*平成24年度中間年報 省エネルギー革新技術開発事業 先導研究 全結晶型リチウムイオン二次電池の研究開発(H23-H25)
公開日2013/5/31
報告書年度2012 - 2012
委託先名国立大学法人信州大学 トヨタ自動車株式会社 学校法人芝浦工業大学
プロジェクト番号P09015
部署名省エネルギー部
和文要約
英文要約itle: Research and Development Program for Innovative Energy Efficiency Technology (Advanced Research). Research and Development of All-Crystal-State Type Lithium Ion Rechargeable Battery (FY2011-FY2013) FY2012 Annual Report
Research Institute: Shinshu University / Toyota Motor Corporation / Shibaura Institute of Technology
(1) Developments of cathode materials
(a) Cycle property of LiCoO2 (LCO) crystal layers fabricated on metal electrodes (or electrolyte crystals) by flux coating.
LCO crystal layers were fabricated on a platinum (Pt) substrate by flux coating method. The LCO/Pt layer showed a good charge-discharge property, maintaining charge capacity of 110 mAhg-1 at 1 C after 50 cycles.
(b) Low-temperature flux growth of precursor particles for LiNixMn2-xO4 (LNMO) applicable to LIBs.
At holding temperatures in the ranges from 700 to 900 oC, idiomorphic LNMO crystals were grown on Pt substrate by evaporation of chloride-based fluxes. The discharge capacity of the LIBs with the grown LNMO/Pt layers was 131 mAh-g-1 (89 % of theoretical capacity) after 30 cycles at 1/3 C.
(c) Low-temperature flux coating of LCO crystal layers on electrolyte crystals.
LCO crystal layers were fabricated on a pelletized Li7La3Zr2O12 (LLZO) by flux coating method.
(2) Developments of anode materials
(a) Evaluation on LIB properties of Li4Ti5O12 (LTO) crystal layers.
LTO crystal layers were successfully grown by the cooling of chloride-based fluxes. The first charge capacity of the LIBs with the grown LTO crystal layers was 164 mAh-g-1 (94 % of theoretical capacity) at 0.1 C.
(b) Low-temperature flux coating of LTO crystal layers on electrolyte crystals.
LTO crystal layers were fabricated on a pelletized LLZO by flux coating method.
(3) Developments of crystal electrolytes
(a) Flux coating fabrication of Li7La3Zr2O12 (LLZO) crystal layers or Li5La3Nb2O12 (LLNO) crystal layers on the surface of cathode materials or anode materials.
Li+ conductivity of the flux-grown LLZO crystals and LLNO crystals was found to be 2.0×10-4 S-cm-1, and 2.9×10-6 S-cm-1, respectively. LLZO crystal layers were successfully fabricated on a pelletized LCO by flux coating.
(b) Flux growth of Li1.5Al0.5Ge1.5(PO4)3 (LAGP) crystals and evaluation of their LIB properties.
Well-developed, single-phase LAGP crystals were grown at 900 oC. From their Rietveld analysis, the flux-grown LAGP crystals were found to have a NASICON-type crystal structure. The results were published in Journal of the Society of Inorganic Materials, Japan, and presented in two domestic conferences. This research was suspended because more promising solid electrolytes, LLNO and LLZO, were successfully synthesized by flux method.
(4) Establishment of continuous coating technique for all-crystal-state LIBs
(a) Fabrication and evaluation of liquid-state LIBs using flux-grown crystal layers (cathode and anode materials) directly on current collectors.
Coating raw materials (paste, solution, etc…) on current collectors is an important step for fabrication of crystal layers for cathodes and anodes in large scale. LCO crystal layers were directly fabricated on Al substrates with the size of 110 × 80 mm by coating aqueous solution containing raw materials using an applicator designed for roll-to-roll fabrication system of all-crystal-state LIBs. Dropping aqueous solution containing raw materials, LCO crystal layers were also fabricated on Al substrates with the size of 150 × 90 mm. The liquid-state LIB properties of LCO crystal layers and LTO crystal layers were shown in (1)-(a) and (2)-(a), respectively.
(b) Development of large-scale crystallization unit for production of all-crystal-state LIB (connected to an applicator which used for coating raw materials).
Specific heating equipment was designed and developed to establish roll-to-roll fabrication system of all-crystal-state LIBs. It was combined with an applicator already developed in 2011.
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