ELECTRODE ACTIVE MATERIAL, ELECTRODE FOR SECONDARY BATTERY AND SECONDARY BATTERY

• Main Authors: OKADA MASARU, YAMAGUCHI TOGO, SATO MINEO, ARIMITSU NOZOMI
• Format: Patent
• Language: English; Japanese
• Published: 05.09.2016
• 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 an electrode active material which is efficiently coated with proper carbonaceous material on the surface thereof and enhanced in collection effect, an electrode for a secondary battery using the same and a secondary battery having an enhanced battery characteristic.SOLUTION: (1) An electrode active material which is coated with a carbonaceous material, the carbonaceous material being carbon black and hydrocarbon, and the ratio (PPA/d) between the number PPA (number) of primary particles 1 forming the aggregate 2 of the carbon black and the diameter d(nm) of the primary particles 1 being equal to 8 or more. (2) The electrode active material according to (1), wherein the hydrocarbon is polystyrene. (3) The electrode active material according to (1) or (2), wherein the diameter d of the primary particles 1 is equal to 15nm or less. (4) An electrode for a secondary battery which comprises a material containing at least the electrode active material according to any one of (1) to (3), and conductive acetylene black. (5) A secondary battery in which a positive electrode and/or a negative electrode is configured by the electrode for a secondary battery according to (4).SELECTED DRAWING: Figure 1 【課題】表面が好適な炭素質材料で効率よく被覆され集電効果が向上した電極活物質、これを用いた二次電池用電極、及び電池特性が向上した二次電池の提供。【解決手段】（１）炭素質材料で被覆された電極活物質であって、前記炭素質材料がカーボンブラック及び炭化水素であり、該カーボンブラックは、その凝集体２を形成する一次粒子１の数ＰＰＡ（個）と、一次粒子１径ｄ（ｎｍ）との比「ＰＰＡ／ｄ」が８以上である電極活物質。（２）前記炭化水素がポリスチレンである（１）に記載の電極活物質。（３）一次粒子１径ｄが１５ｎｍ以下である（１）又は（２）に記載の電極活物質。（４）少なくとも、（１）〜（３）のいずれかに記載の電極活物質と、導電材のアセチレンブラックを含有する材料からなる二次電池用電極。（５）正極及び／又は負極が（４）に記載の二次電池用電極で構成されている二次電池。【選択図】図１