成果報告書詳細
管理番号20110000000931
タイトル*平成22年度中間年報 新エネルギーベンチャー技術革新事業/新エネルギーベンチャー技術革新事業(燃料電池・蓄電池)/低コスト化、高信頼性を可能にするLi系二次電池用の新形状3D電極基板の技術開発
公開日2011/6/23
報告書年度2010 - 2010
委託先名株式会社エムアンドジーエコバッテリー
プロジェクト番号P10020
部署名技術開発推進部
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)開発テーマの概要
HEV用Li系二次電池の低コスト化、高信頼性化を目的として、昨年度のNEDO「新エネルギーベンチャー技術革新事業」(フェーズ1)において、立体化基板(3DF)の研究開発を進めた。
しかし、3DFの形状上、製作方法上の要因から、立体化加工時および加工後に金属微粉が発生あるいは残留する問題があり、その定量化方法および除去方法の検討に取り組んだが、いずれも不満足な結果となった。
また、その後新たに、一部のサンプル提供先から、3DFの面に垂直に形成される先端部への電流集中が原因と推定される電池の微短絡現象が報告された。
この様な背景から、原理上、金属微粉の発生しない、また従来3DFのような垂直方向への先端のない新構造のブリッジ型立体化基板(B~3DF)の開発を行なう必要があった。
「第1図」にB~3DFの構造概念を、「表1」にB~3DFのねらいを示す。
英文要約1. The aim of a new bridge-shaped three dimensional foil (B-3DF):
Li secondary batteries are currently using thin foils of Al and Cu for the electrodes and accordingly their thickness is only about 100 μm. By replacing thin foils to B-3DF substrates, the electrode can be made thicker than the conventional. As a result, the following two advantages can be achieved.
1)Cost reduction
The consumption of both the substrate and separator decreases as the electrode area decreases, followed by material cost reduction.
Thicker electrodes will also reduce production cost by reducing manufacturing time.
2)Improvement of battery reliability(safety)
Thicker electrodes will improve battery reliability by preventing winding
misalignment and short circuit, as well.
2. Operation substances:
1) Designing of B-3DF and production of laboratory-scale roll.
2) Confirmation and removal of metallic residual micro powder on B-3DF.
3) Evaluation of tensile strength.
4) Evaluation of electrochemical characteristics.
5) Offer of B-3DF samples.
6) Preparation of business plan.
3. Results:
3.1. Designing of B-3DF and production of laboratory-scale roll:
The basic design of B-3DF was performed. B-3DF has small convexo-concaves allocated alternately having openings in a horizontal direction,. Based on the basic design, the laboratory-scale roll was made three times. The third roll produced B-3DF samples without fracturing. Their thickness is about 350μm thicker than our target value (250μm). The fourth trial will be performed according to the results of following tests.
3.2. Confirmation and removal of metallic residual micro powder on B-3DF:
The third trial products of B-3DF were observed by microscope and no free
metallic micro powder was confirmed. However burrs at the opening of B-3DF were observed, which will be not ignored in Li secondary battery. The further improvement of the roll teeth shape is needed.
Pre-coating
Pre-coating system was proposed to ensure no metallic micro powder mixes into a Li secondary cell in case the micro powder free B-3DF cannot be assured.
3.3. Tensile strength:
The tensile strength of the third trial products was measured in machine,
transverse and 45 degree directions. All measurements of both Al and Cu samples did not achieve the target value which is 60% of the strength of original foil. Especially in transverse and 45 degree directions, the strength was very low.
3.4. Electrochemical Characteristics:
Lithium ion battery using laminate package was designed.
The electrode thickness is 0.2mm (twice thicker than the conventional). The positive material is Co, Ni and Mn ternary compound and the negative is graphite. The capacity is about 70mAh. This battery samples are now being made.
3.5. Offer of B-3DF samples:
B-3DF third trial products as an appearance sample were offered to two companies which are developing Li secondary batteries.
3.6. Preparation of business plan:
The business plan was prepared under NEDO guidance.
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