Binder composition for non-aqueous secondary battery electrode, slurry composition for non-aqueous secondary battery electrode, electrode for non-aqueous secondary battery, and non-aqueous secondary battery

Patent metadata

Field	Value
Publication number	US-2022359878-A1
Application number	US-202017754217-A
Country	US
Kind code	A1
Filing date	Sep 23, 2020
Priority date	Sep 30, 2019
Publication date	Nov 10, 2022
Grant date	—

Abstract

Provided is a binder composition for a non-aqueous secondary battery electrode with which it is possible to form a slurry composition for a non-aqueous secondary battery electrode having excellent stability and an electrode for a non-aqueous secondary battery having excellent peel strength after thermal drying. The binder composition for a non-aqueous secondary battery electrode contains a particulate polymer A and a particulate polymer B. The particulate polymer A includes: a backbone portion formed of a block copolymer that includes an aromatic vinyl monomer unit and an aliphatic conjugated diene monomer unit; and a graft portion. The particulate polymer B includes an aliphatic conjugated diene monomer unit in a proportion of 70.0 mass % or more and includes a graft portion.

First claim

1 . A binder composition for a non-aqueous secondary battery electrode comprising a particulate polymer A and a particulate polymer B, wherein
the particulate polymer A includes: a backbone portion formed of a block copolymer that includes an aromatic vinyl monomer unit and an aliphatic conjugated diene monomer unit; and a graft portion, and the particulate polymer B includes an aliphatic conjugated diene monomer unit in a proportion of 70 mass % or more and includes a graft portion.

2 . The binder composition for a non-aqueous secondary battery electrode according to claim 1 , wherein content of the particulate polymer A is not less than 20.0 mass % and not more than 80.0 mass % when total content of the particulate polymer A and the particulate polymer B is taken to be 100 mass %.

3 . The binder composition for a non-aqueous secondary battery electrode according to claim 1 , wherein proportional content of aromatic vinyl monomer units in the particulate polymer A is not less than 10.0 mass % and not more than 50.0 mass %.

4 . The binder composition for a non-aqueous secondary battery electrode according to claim 1 , wherein the block copolymer includes a block region formed of aromatic vinyl monomer units, and
the block region has a weight-average molecular weight of 15,000 or more.

5 . The binder composition for a non-aqueous secondary battery electrode according to claim 1 , wherein the graft portion of the particulate polymer A includes a carboxy group-containing monomer unit.

6 . The binder composition for a non-aqueous secondary battery electrode according to claim 1 , wherein the particulate polymer A has a volume-average particle diameter of not less than 0.1 μm and not more than 2.0 μm.

7 . The binder composition for a non-aqueous secondary battery electrode according to claim 1 , wherein cis-1,4-bonded monomer units are included in a proportion of 90 mol % or more among aliphatic conjugated diene monomer units included in the particulate polymer B.

8 . The binder composition for a non-aqueous secondary battery electrode according to claim 1 , wherein the graft portion of the particulate polymer B includes either or both of a (meth)acrylic acid ester monomer unit and a nitrile group-containing monomer unit.

9 . The binder composition for a non-aqueous secondary battery electrode according to claim 1 , wherein the particulate polymer B has a volume-average particle diameter of not less than 0.6 μm and not more than 2.5 μm.

10 . A slurry composition for a non-aqueous secondary battery electrode comprising: an electrode active material; and the binder composition for a non-aqueous secondary battery electrode according to claim 1 .

11 . An electrode for a non-aqueous secondary battery comprising an electrode mixed material layer formed using the slurry composition for a non-aqueous secondary battery electrode according to claim 10 .

12 . A non-aqueous secondary battery comprising the electrode for a non-aqueous secondary battery according to claim 11 .

Assignees

• Zeon Corp

Inventors

• Akabane Tetsuya
• Kidokoro Hiroto

Classifications

• H01M4/139

  Processes of manufacture · CPC title

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• C08L51/04

  grafted on to rubbers · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/622 Primary

  being polymers · CPC title