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    • 7. 发明公开
    • LIQUID HOLDING BODY FOR LITHIUM SECONDARY BATTERIES, AND LITHIUM SECONDARY BATTERY
    • FLÜSSIGKEITSHALTEKÖRPERFÜRLITHIUMSEKUNDÄRBATTERIENUNDLITHIUMSEKUNDÄRBATTERIE
    • EP2822086A4
    • 2015-10-21
    • EP12870046
    • 2012-03-19
    • SEI CORPNIPPON KODOSHI CORP
    • SAWAI TAKEHIKOSAITO SHINJIURAO KAZUNORIUSHIMOTO JYUNICHIUETA MASAHIKOWADA NORIHIRO
    • H01M2/16H01M4/587H01M10/052H01M10/0525H01M10/0566H01M10/0585H01M10/0587
    • H01M2/1686H01M2/1613H01M2/162H01M2/1626H01M2/1653H01M2/1666H01M4/133H01M4/587H01M10/0431H01M10/052H01M10/0525H01M10/0566H01M10/0585H01M10/0587H01M2004/027
    • The present invention provides an electrolyte holder for a lithium secondary battery capable of holding an electrolytic solution inside electrodes or at an interface between the separator and each of the electrodes, preventing electrolyte shortage inside the electrodes, and restraining dendrite from precipitating and growing and also provide the lithium secondary battery, using the electrolyte holder, which is capable of achieving a cycle life to such an extent that the lithium secondary battery can be used for industrial application. An electrolyte holder (3) for use in the lithium secondary battery consists of a multi-layer structure having at least two hydrophilic fibrous layers (A, B) having different porosities. The electrolyte holder (3)is composed of an electrode group formed by winding a cathode (2) and an anode (1) or laminating the cathode (2) and the anode (1) one upon another with an electrolyte holder (3) serving as a separator interposed between the cathode (2) and the anode (1). The organic electrolytic solution is permeated into the electrode group or the electrode group is immersed in the organic electrolytic solution. A porosity (40% to 80%) of the fibrous layer (A) disposed at an interface between the fibrous layer (A) and the anode (1) is set smaller than a porosity (60% to 90%) of the fibrous layer (B) disposed at an interface between the fibrous layer (B) and the cathode (2). An average porosity of the entire fibrous layer is set to not less than 50%. The fibrous layers are formed by using cellulose fibers as a main material thereof. An active substance for use in the anode (1) is a carbon material.
    • 本发明提供一种用于锂二次电池的电解质保持器,其能够将电解液保持在电极内部或隔板与每个电极之间的界面处,防止电极内的电解质不足,并且抑制枝晶的沉淀和生长,并且还提供 使用电解质保持器的锂二次电池,其能够实现循环寿命,使得锂二次电池可以用于工业应用。 用于锂二次电池的电解质保持器(3)由具有至少两个具有不同孔隙率的亲水性纤维层(A,B)的多层结构构成。 电解质保持器(3)由通过将阴极(2)和阳极(1)缠绕而形成的电极组或层叠阴极(2)和阳极(1)而形成的电极组与电解质保持器(3) 作为插入在阴极(2)和阳极(1)之间的隔膜。 将有机电解液渗透到电极组中,或将电极组浸渍在有机电解液中。 设置在纤维层(A)和阳极(1)之间的界面处的纤维层(A)的孔隙率(40%至80%)被设定为小于纤维层的孔隙率(60%至90%) (B)设置在纤维层(B)和阴极(2)之间的界面处。 整个纤维层的平均孔隙率设定为不小于50%。 纤维层通过使用纤维素纤维作为其主要材料而形​​成。 用于阳极(1)的活性物质是碳材料。