Binder for electrode of lithium rechargeable battery and electrode for rechargeable battery comprising the same
AssigneeSamsung SDI Co., Ltd.
InventorsByungjoo Chung, Namseon Kim, Kwangshik Choi, Yangsoo Kim
Life of this patent
Estimating the term…
Abstract
In one aspect, a binder for an electrode of a lithium rechargeable battery, which increases adhesion between the electrode and an active material by saving characteristics of two monomers by grafting an acryl group to a vinyl alcohol group, and an electrode for a rechargeable battery comprising the same are provided. The electrode can improve charge and discharge cycle life characteristics of the rechargeable battery.
Claims10
An active material for an electrode of a rechargeable battery, comprising:
- an electrode active material;
- a binder for an electrode of a lithium rechargeable battery, comprising a copolymer of Chemical Formula 1:
- wherein L1 is
- wherein R1 is OH or —OR5, where R5 is —(CHR2CR3COOR4)m(CHR2CHR3COOR4) (m is an integer between 500 and 5,000), R2 and R3 are each independently H (hydrogen), a substituted or unsubstituted C1-C10 alkyl group, a substituted or unsubstituted styrene group, or —Si(OR6)3, where R6 is independently H (hydrogen) or a substituted or unsubstituted C1-C20 alkyl group, a C2-C20 alkenyl group, a C2-C20 alkynyl group, a C1-C16 alkyl group, a C6-C20 aryl group, C3-C8 cycloalkyl group, wherein at least one of R2 and R3 is not H (hydrogen), R4 is H (hydrogen), a substituted or unsubstituted C1-C10 linear or branched alkyl group, a substituted or unsubstituted C2-C20 alkenyl group, a C3-C8 cycloalkyl group, a substituted or unsubstituted silane group, or a substituted or unsubstituted C1-C20 alkylsilane group, x is an integer between 1 and 5,000, the grafted acryl group (R5) is 30 to 70 wt % of the molecular mass of Chemical Formula 1, and n is an integer between 500 and 5,000;
- and
- a solvent.
A binder for an electrode of a lithium rechargeable battery, comprising a copolymer of Chemical Formula 1:
- wherein L1 is
- wherein R1 is OH or —OR5, where R5 is —(CHR2CR3COOR4)m(CHR2CHR3COOR4) (m is an integer between 500 and 5,000), R2 and R3 are each independently H (hydrogen), a substituted or unsubstituted C1-C10 alkyl group, a substituted or unsubstituted styrene group, or —Si(OR6)3, where R6 is independently H (hydrogen) or a substituted or unsubstituted C1-C20 alkyl group, a C2-C20 alkenyl group, a C2-C20 alkynyl group, a C1-C16 alkyl group, a C6-C20 aryl group, C3-C8 cycloalkyl group, wherein at least one of R2 and R3 is not H (hydrogen),
- R4 is H (hydrogen), a substituted or unsubstituted C1-C10 linear or branched alkyl group, a substituted or unsubstituted C2-C20 alkenyl group, a C3-C8 cycloalkyl group, a substituted or unsubstituted silane group, or a substituted or unsubstituted C1-C20 alkylsilane group, x is an integer between 1 and 5,000, the grafted acryl group (R5) is 30 to 70 wt % of the molecular mass of Chemical Formula 1, and
- n is an integer between 500 and 5,000,
- wherein the binder is made by a process comprising:
- grafting acryl monomer to polyvinyl alcohol, where the acryl monomer is at least one monomer selected from the group consisting of methyl(meth)acrylate, butyl(meth)acrylate, ethyl acrylate, 2-ethyl hexyl acrylate, hydroxypropyl(meth)acrylate, styrene, alpha-methyl styrene and (meth)acrylonitrile;
- and
- at least one carboxylic monomer selected from the group consisting of (meth)acrylic acid, itaconic acid, furmaric acid, crotonic acid, maleic acid, monomethyl itaconate, methyl fumarate and monobutyl fumarate, which are used alone or in a combination of two or more of these materials.
Dependencies are inferred from the claim text.