成果報告書詳細
管理番号20120000000042
タイトル*平成19年度中間年報 系統連系円滑化蓄電システム技術開発 要素技術開発 新エネルギー・電力事業用リチウムイオン蓄電システムの高性能・低コスト化の研究開発
公開日2012/7/19
報告書年度2007 - 2007
委託先名北陸電力株式会社 エナックス株式会社
プロジェクト番号P06004
部署名新エネルギー技術開発部
和文要約和文要約等以下本編抜粋:
1. 研究開発の内容及び成果等
(1) 負極材・集電材の研究開発
a)金属酸化物の適応と負極材/集電材の基礎研究(岩手大学)
安定化したチタン酸リチウム/LTO負極とマンガン酸リチウム/LMO正極を、アルミニウム集電箔(正、負)系で詳細に評価した。スプレードライ合成法では、Li4.3Ti5O12の組成が最も優れた>160mAh/gの放電容量を示した。この系における電解液、電解質、正極/負極の容量比等を詳細に検討し、実用電池LSBの設計に必要な要件を確定した。この設計条件ではMnのLTO負極表面への沈積が無い事をTOF-SIMS法で観察し、原理的に安定な電池であることが確認された。
b)低コスト、量産性および高い電池特性を有する負極活物質原料の研究(日下レアメタル研究所)
有機酸前駆体法でチタン酸リチウム/LTO負極材料を合成した。Ti/シュウ酸前駆体を乾燥後に、焼成を行うプロセスの条件を詳細に検討した。乾燥は量産性との関係で重要であり、連続ドラム乾燥法が優れている。焼成工程は700℃における電気炉法と新たなマイクロ波炉を比較検討した結果、後者の方が電力消費量が少なく優れている。LTOの結晶構造を確認し、更に電池特性について実験中である。
c)負極材・集電材の適合性の研究(エナックス株式会社)
チタン酸リチウム/LTO負極とマンガン酸リチウム/LMO正極をアルミニウム集電箔
(正、負)系で評価した。実験は3Ahクラスの積層型セルの規模で、生産実機による極板の製造とセルのアッセンブリーを経て組み立てた。LSBの特性を活かす為に、電解液系とセパレーターの選定を注意深く行い、サイクル試験を進行中である。
英文要約Title: Technology Development of Energy Storage System to Facilitate Interconnection of Renewable Energy to Power Grid/Element technology development/Research and Development about High Efficiency - Low Cost of Energy Storage System for New Energy and Electric Power Application which used Lithium-Ion Battery (FY2006-FY2007) FY2007 Annual Report

(1) Study on the advanced anode materials and combined collecting materials
a) Basic study on the Anode/Collector combination in Li-ion cell and the application of Titanium Oxide anode (Iwate University)
Stabilized Lithium Titanium Oxide/LTO Anode with LMO Cathode lithium ion secondary cell are assembled on both aluminum collector. Developed spray-dry synthesis yield a best discharge capacity, 160 mAh/g and over in Li4.3Ti5O12 formula. Detail studies on the cell organization, Electrolyte, Li-salt and the Anode/Cathode ratio finally determine the practical Laminate Sheet Battery design. TOF-SIMS tracing observation of Mn ion confirmed that the LTO anode is completely free from Mn-deposition. This must be the principle of the long life LTO cell.

b) Manufacture of low cost anode active material applicable in the high performance Li-ion battery (KUSAKA RARE METAL PRODUCTS CO., LTD.)
New organic acid precursor method is applied on the synthesis of Lithium Titanium Oxide/LTO Anode. Processing conditions in the Ti-ion/oxalic acid precursor fed drying and heat treatment are examined. Selected continuous rotary drum system is suitable for the mass production of LTO. Calcination process with micro-wave assist furnace at 700 C-deg is superior to that of simple electric furnace in saving of the electric power consumption. Crystalline structure of the product is identified and further examination is in progress.

c) Examination of the Anode/Collector combination for the industrial Li-ion battery (ENAX, INC.)Lithium Titanium Oxide (LTO) anode lithium ion battery combined with LMO cathode on both aluminum current collector was evaluated. 3 Ah- class laminate cells (battery) were prepared after the industrial scale LTO and LMO coating and assembly steps. To take the advantage of laminate cell, combination of the electrochemically stable Li-salt and electrolytes are selected for charge/discharge and cycle tests.

(2) Study on anode materials
a) Developments of Lithium Manganese Oxide (LMO) cathode material through the internal combustion type spray pyrolysis process (FUKUI UNIVERSITY)
Internal combustion type spray pyrolysis process is applied to the effective production of LMO cathode material. Acidic solution of the raw material is fed using adjustable two-fluidized nozzle atomizer and the produced particle possess high-rate capable sub-micron characteristics. Current composition is Al-incorporated Li1.1Al0.05Mn1.95O4 with thermal stabilized characteristics in charge/discharge cycle. More than 80mAh/g(60 C-deg,100cyle) in coin type cell is finally confirmed after the laminate type cell.

b) Manufacture of low cost cathode active material applicable in the high performance Li-ion battery (KUSAKA RARE METAL PRODUCTS CO., LTD.)
New organic acid precursor method is applied on the synthesis of Lithium Manganese Oxide/LMO cathode. Processing conditions in the Mn-ion/organic acid precursor fed drying and heat treatment are examined. Selected continuous rotary drum system is suitable for the mass production of LMO. Calcination process with micro-wave assist furnace at 800 C-deg is superior to that of simple electric furnace in saving of the electric power consumption. Finally, stabilizing Al incorporated Li1.09Al0.05Mn2O4 is selected and the rystalline structure of the product is identified by the XRD pattern and further examinations including charge/discharge at the elevated temperature are in progress.
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