NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

• Main Authors: YAMAGUCHI RYUTA, OGAWA HIROSHI, HAGIYAMA KOSUKE, HONDA TAKASHI, MIYAMOTO KENJI
• Format: Patent
• Language: English; Japanese
• Published: 16.06.2016
• 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 means which enables the enhancement in vibration resistance to minimize the deterioration of battery characteristics (including a discharge capacity) owing to vibration resistance in a battery using an aqueous binder as a binder of a negative electrode active material layer.SOLUTION: A nonaqueous electrolyte secondary battery comprises a power-generating element having: a positive electrode including a positive electrode current collector and a positive electrode active material layer formed on the surface of the positive electrode current collector; a negative electrode including a negative electrode current collector and a negative electrode active material layer formed on the surface of the negative electrode current collector and including an aqueous binder; and a separator holding an electrolytic solution. In the nonaqueous electrolyte secondary battery, the amount of the binder included in the negative electrode active material layer is made 2-4 mass% to a total of 100 mass% of the negative electrode active material layer. Otherwise the 90°-peel strength when peeling the negative electrode active material layer from the negative electrode current collector is 30-70 N/mm and the percentage at the outer peripheral edge of the negative electrode active material layer, of a part which has been an end accounts for is less than 75%.SELECTED DRAWING: Figure 2 【課題】負極活物質層のバインダーとして水系バインダーを用いた電池において、耐振動性を向上させ、振動の負荷による電池特性（放電容量）の低下を最小限に抑制しうる手段を提供する。【解決手段】正極集電体の表面に正極活物質層が形成されてなる正極と、負極集電体の表面に水系バインダーを含む負極活物質層が形成されてなる負極と、電解液を保持するセパレータとを有する発電要素を備えた非水電解質二次電池において、前記負極活物質層中に含まれるバインダー量を前記負極活物質層の全量１００質量％に対して２〜４質量％とするか、または、前記負極集電体からの前記負極活物質層の９０°剥離強度を３０〜７０Ｎ／ｍｍとし、かつ、前記負極活物質層の外周縁部における端部率を７５％未満とする。【選択図】図２