# US 12,015,140 B2 · Method for producing resin collector for negative electrodes, method for producing negative electrode for lithium ion batteries, and method for producing lithium ion battery

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- Number: US 12,015,140 B2
- Document ID: US12015140B2
- Status: Granted
- Kind: B2
- Application number: 17/285,682
- Filed: 2019-10-21
- Published: 2021-12-30
- Granted: 2024-06-18
- Earliest claimed: 2018-10-22
- Assignees: Sanyo Chemical Industries, Ltd.; Gunze Limited
- Applicants: Sanyo Chemical Industries, Ltd.; Gunze Limited
- Inventors: Ryosuke Kusano; Yasuhiro Tsudo; Yasuji Maruyama; Kazuaki Onishi; Yasuhiko Ohsawa; Yuki Kusachi; Hajime Satou; Hiroshi Akama; Hideaki Horie
- Web page: https://patentgrep.com/patent/US12015140B2

## CPC

- H01M 4/139: Processes of manufacture
- B29C 48/001: {Combinations of extrusion moulding with other shaping operations}
- B29C 48/022: {characterised by the choice of material}
- B29C 48/08: flexible, e.g. films
- B29C 48/21: the layers being joined at their surfaces
- H01M 4/04: Processes of manufacture in general
- H01M 4/667: {in the form of layers, e.g. coatings}
- H01M 4/668: {Composites of electroconductive material and synthetic resins}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- B29K 2505/08: Transition metals
- B29K 2995/0005: Conductive
- B29L 2031/3468: {Batteries, accumulators or fuel cells (battery cases B29L2031/7146)}
- H01M 2004/027: {Negative electrodes}
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The present invention aims to provide a method for producing a pinhole-free thin resin current collector for negative electrodes. The method for producing a sheet-shaped resin current collector for negative electrodes of the present invention includes stacking three or more layers of melts of conductive resin compositions each containing a polyolefin and a conductive filler to obtain a multilayered body, wherein the polyolefin contained in each of the conductive resin compositions that form the respective layers of the multilayered body has a melt mass flow rate of 15 to 70 g/10 min as measured at a temperature of 230° C. and a load of 2.16 kg in accordance with JIS K7210-1:2014.

## Claims

### Claim 1

A method for producing a sheet-shaped resin current collector for negative electrodes, comprising
stacking three or more layers of melts of conductive resin compositions each containing a polyolefin and a conductive filler to obtain a multilayered body,
wherein the polyolefin contained in each of the conductive resin compositions that form the respective layers of the multilayered body has a melt mass flow rate of 15 to 70 g/10 min as measured at a temperature of 230° C. and a load of 2.16 kg in accordance with JIS K7210-1:2014, and
wherein the multilayered body includes a layer of a conductive resin composition containing nickel particles as the conductive filler and a layer of a conductive resin composition containing a conductive carbon as the conductive filler.

### Claim 2 (depends on 1)

The method for producing a resin current collector for negative electrodes according to claim 1,
wherein the multilayered body includes at least two layers of conductive resin compositions each containing a polyolefin and nickel particles.

### Claim 3 (depends on 1)

The method for producing a resin current collector for negative electrodes according to claim 1,
wherein the weight ratio of the conductive filler contained in each of the conductive resin compositions that form the respective layers of the multilayered body is 15 to 75% by weight based on the total weight of the polyolefin and the conductive filler contained in the conductive resin composition.

### Claim 4 (depends on 1)

The method for producing a resin current collector for negative electrodes according to claim 1,
wherein the multilayered body comprises two main surfaces, and the method further comprises forming a metal layer on at least one of the two main surfaces of the multilayered body.

### Claim 5 (depends on 1)

A method for producing a negative electrode for lithium ion batteries, comprising
producing a resin current collector for negative electrodes by the method according to claim 1, and
forming a negative electrode active material layer on one surface of the resin current collector for negative electrodes.

### Claim 6 (depends on 5)

A method for producing a lithium ion battery, comprising
producing a negative electrode for lithium ion batteries by the method according to claim 5.