发明名称 Binder for secondary battery providing excellent cycle property
摘要 Provided is a binder for secondary battery electrodes wherein the content of a gel comprising a polymer particle obtained by copolymerizing three or more types of monomers is 50 to 100% by weight and a swelling index of the binder to an electrolyte is 1.1 to 5.0. The binder fundamentally improves electrode stability due to the gel content defined above and increases ionic conductivity due to the swelling index, thus providing secondary batteries with superior cycle properties.
申请公布号 US9543584(B2) 申请公布日期 2017.01.10
申请号 US201113704013 申请日期 2011.06.08
申请人 LG Chem, Ltd. 发明人 Kim Ok Sun;Kim Young-Min;Kang MinAh
分类号 H01M4/62;C08F212/12;C08F212/32;C08F212/36;C08F220/18;H01M10/0525;C08F212/08;C08F220/06;C08F220/40;H01M4/131;H01M4/133;H01M4/134;H01M10/0567;H01M10/0569;C08F220/44 主分类号 H01M4/62
代理机构 Lerner, David, Littenberg, Krumholz & Mentlik, LLP 代理人 Lerner, David, Littenberg, Krumholz & Mentlik, LLP
主权项 1. A binder for secondary battery electrodes, comprising: a gel comprising a polymer particle obtained by copolymerizing three or more types of monomers, the binder having a gel content ranging from 97 to 99% by weight and a swelling index in the presence of an electrolyte ranging from 1. 3 to 1.9, wherein the electrolyte comprises ethylene carbonate, propylene carbonate and diethyl carbonate, wherein a mass ratio of diethyl carbonate to ethylene carbonate and propylene carbonate is 1:1 and wherein the three or more types of monomers are an ethylenically unsaturated carbonic acid ester monomer, at least one monomer selected from the group consisting of a vinyl monomer and a nitrile monomer, and an ethylenically unsaturated carbonic acid monomer, wherein the ethylenically unsaturated carbonic acid ester monomer and the at least one monomer selected from the group consisting of a vinyl monomer and a nitrile monomer are present in an amount of 80 to 99% by weight, based on the total weight of the binder, and the ethylenically unsaturated carbonic acid monomer is present in an amount of greater than 5% to 20% by weight, based on the total weight of the binder, wherein the cross-linking agent is present in an amount of 0.1 to less than 1% by weight, based on the total weight of the copolymer, and wherein the cross-linking agent is at least one monomer selected from the group consisting of difunctional monomers, trifunctional monomers, tetrafunctional monomers, pentafunctional monomers, and hexafunctional monomers.
地址 KR