Binder for lithium ion secondary battery positive electrodes
AssigneeSumitomo Seika Chemicals Co., Ltd.
InventorsYasuhito Ushijima, Junichi Fujishige, Shun Hashimoto, Yuji Kinpara
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Abstract
Provided is a binder for lithium ion secondary battery positive electrodes, which is capable of providing a positive electrode for lithium ion secondary batteries with excellent high-rate discharge characteristics. A binder for lithium ion secondary battery positive electrodes, which contains a binder resin and 500 ppm or less of an oil-soluble radical initiator.
Claims9
A binder for lithium ion secondary battery positive electrodes, comprising:
- a binder resin;
- and an oil-soluble radical initiator in a concentration of 500 ppm or less, wherein the binder resin comprises an alkyl-modified carboxyl group-containing interpolymer prepared by copolymerizing a (meth)acrylic acid alkyl ester having an alkyl group with 18 to 24 carbon atoms in a proportion of 0.1 to 10 parts by mass with 100 parts by mass of (meth)acrylic acid.
A method of producing a binder for lithium ion secondary battery positive electrodes, comprising the step of mixing a binder resin comprising an alkyl-modified carboxyl group-containing interpolymer prepared by copolymerizing a (meth)acrylic acid alkyl ester having an alkyl group with 18 to 24 carbon atoms in a proportion of 0.1 to 10 parts by mass with 100 parts by mass of (meth)acrylic acid and an oil-soluble radical initiator in a concentration of 500 ppm or less.
Dependencies are inferred from the claim text.