NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND METHOD FOR MANUFACTURING NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

• Main Authors: MINAMI YOSHIAKI, FUJIWARA TOYOKI
• Format: Patent
• Language: English; Japanese
• Published: 06.07.2015
• 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 nonaqueous electrolyte secondary battery superior in output characteristic.SOLUTION: A nonaqueous electrolyte secondary battery comprises: an electrode body having a positive electrode plate 1 including a positive electrode core 1a and a positive electrode mixture layer 1c formed on the surface of the positive electrode core, and a negative electrode plate, including a negative electrode core and a negative electrode mixture layer formed on the surface of the negative electrode core; and a nonaqueous electrolyte. The positive electrode mixture layer 1c includes a lithium transition metal complex oxide. The negative electrode mixture layer includes a negative electrode active material which lithium ions can be absorbed by and desorbed from. The positive electrode plate 1 has a thickness of 60 μm or less, and the negative electrode plate has a thickness of 65 μm or less. The thickness of the positive electrode core 1a is 22-27% of the thickness of the positive electrode plate 1. The thickness of the negative electrode core is 12-15% of the thickness of the negative electrode plate. 【課題】出力特性に優れた非水電解質二次電池を提供する。【解決手段】正極芯体１ａ表面に正極合剤層１ｃが形成された正極板１と、負極芯体表面に負極合剤層が形成された負極板とを有する電極体及び非水電解質を備えた非水電解質二次電池であって、前記正極合剤層１ｃはリチウム遷移金属複合酸化物を含み、負極合剤層はリチウムイオンの挿入・脱離が可能な負極活物質を含み、正極板１の厚みは６０μｍ以下であり、負極板の厚みは６５μｍ以下であり、正極板１の厚みに対する正極芯体１ａの厚みは２２〜２７％であり、負極板の厚みに対する負極芯体の厚みは１２〜１５％である非水電解質二次電池。【選択図】図３