SHEET-LIKE ACTIVE MATERIAL PARTICLE-CONTAINING MOLDING FOR SECONDARY BATTERY ELECTRODE, SECONDARY BATTERY ELECTRODE, AND SECONDARY BATTERY USING THE SAME

• Main Authors: IMAIZUMI JUNICHI, IMAZAKI MITSUYASU
• Format: Patent
• Language: English; Japanese
• Published: 08.12.2016
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To provide a sheet-like active material particle-containing molding which suppresses breakdown of secondary particles during manufacture of an electrode sheet and/or during rolling, when preparing a thick electrode, and to provide a secondary battery electrode, and a secondary battery using the same.SOLUTION: In this sheet-like active material particle-containing molding for the secondary battery, which contains not less than 80 weight % of active material secondary particles each having a volume average particle diameter of 1-100 μm, and the thickness of which is 0.3-3 mm, a binding material resin having tensile strength of not more than 300 kg/cm, and tensile elastic modulus of not more than 6.0×10kg/cmis contained between the active material secondary particles as a fibrous shape holding structure, the active material secondary particle contains an oxide active material primary particle having a volume average particle diameter of 0.1-1 μm, and the number average particle compression breakdown strength of the active material secondary particle is not less than 3 MPa.SELECTED DRAWING: Figure 1 【課題】厚い電極を作製する場合、電極シート作製時および／または圧延時に二次粒子の破壊を抑制したシート状活物質粒子含有成形体、二次電池用電極、それを用いた二次電池の提供。【解決手段】体積平均粒子径１〜１００μｍの活物質二次粒子８０重量％以上を含み、厚みが０．３〜３ｍｍの二次電池電極用シート状活物質粒子含有成形体であって、さらに、該活物質二次粒子の間に、繊維状の形状保持構造体として、引張強度が３００ｋｇ／ｃｍ２以下、及び、引張弾性率が６．０×１０３ｋｇ／ｃｍ２以下の結着材樹脂を含み、該活物質二次粒子が、体積平均粒子径が０．１〜１μｍの酸化物活物質一次粒子を含み、かつ、該活物質二次粒子の数平均粒子圧縮破壊強度が３ＭＰａ以上である二次電池電極用シート状活物質粒子含有成形体。【選択図】図１