成果報告書詳細
管理番号20090000000781
タイトル*平成20年度中間年報 次世代自動車用高性能蓄電システム技術開発/要素技術開発/高出力可能な高エネルギー密度型リチウムイオン電池の研究開発
公開日2010/3/24
報告書年度2008 - 2008
委託先名日立ビークルエナジー株式会社 株式会社日立製作所
プロジェクト番号P07001
部署名燃料電池・水素技術開発部 蓄電技術開発室
和文要約以下本編抜粋:1.委託研究開発の内容及び成果等 1.1単電池開発 1) 材料の研究開発 1)-1 材料の改良・開発 ((株)日立製作所担当) 平成19年度には層状構造のNi-Mn系正極材料において、高容量化が期待できる組成範囲の探索した。その結果、Ni含有量が60%以上の組成領域で高容量な正極材料が得られることがわかった。平成20年度には、この平成19年度の開発成果をベースに、正極材料の安定性の向上を図ることを目的に異種元素置換の正極材料の開発を進めた。一般的な正極材料の中ではスピネルMnの熱安定性が比較的高いことが知られており、ここではMn酸化物より結合力が強い、すなわち標準生成エンタルピーが大きい異種元素を対象に置換を試みた(図1)。満充電状態での異種元素置換正極材料の昇温脱離酸素ガス分析により、急激な酸素ガスの脱離を抑制する可能性が見出された(図2)。
英文要約Achievement for 2008 FY
Hitachi, Ltd.
Hitachi Vehicle Energy, Ltd.
Development of Advanced Battery System Technology for Next Generation Vehicles
Development of Component Technology
Research and Development for High-Energy-Density Lithium Ion Battery with High-Power
Capability
1.1. Development of Single Cell
1) Research and Development of Materials
1)-1 Development and Improvement of Materials (Hitachi, Ltd.)
Based on the result for 2007 FY that Ni composition for the positive electrode with both
high capacity and high energy density should contain 60 to 70% Ni, we attempted to
stabilize the material at high temperatures by substituting different element with the base
material. We found the capability to reduce the heat generation up to 400 degree Celsius by
introducing small amount of a proper element with a small decrease of capacity density and
without loss of power density.
Graphite for negative electrode was improved by lower the specific surface area without
losing the power density in order to enhance the storage life.
1)-2 Battery Application Technology (Hitachi Vehicle Energy, Ltd)
New slurry specification for the improved negative electrode material mentioned above
was developed to strengthen the adhesion to the electrode substrate. We also started to
improve the slurry further with new binder material.
1.2 Research and Development on Single Cell Structure (Hitachi Vehicle Energy, Ltd)
We improved the 10 Ah-class cell structure based on the test results for the cells of 2007
FY specification. Our effort was concentrated mainly on the current collecting structure and
gas release vent structure.
We manufactured some 10 Ah-class flat-type cells experimentally. The rated capacity
was 14.2 Ah with the dimensions of 97 mm width, 120 mm height and 23 mm thickness.
The energy density was 115 Wh/kg and the 10 s power density at 50% SOC (State of
Charge) was 2500 W/kg. Thus we achieved our annual target for 2008 FY, 110 Wh/kg and
2500 W/kg.
1.3 Research and Development on Module Structure (Hitachi Vehicle Energy, Ltd)
We continued to improve the module structure for the 300 Wh-class module with 8 cells
which we designed last year. We elaborated to simplify the parts to reduce the assembly
procedure. We also started to analyze the mechanical and thermal properties for it.
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