# US 8,540,902 B2 · Carbon nanotube based pastes

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- Number: US 8,540,902 B2
- Document ID: US8540902B2
- Status: Granted
- Kind: B2
- Application number: 13/006,266
- Filed: 2011-01-13
- Published: 2011-07-14
- Granted: 2013-09-24
- Earliest claimed: 2010-01-13
- Assignees: CNano Technology Limited
- Applicants: Caihong Xing; Jianfeng Wang; Zhaojie Wei; Jun Ma; Ching-Jung Tsai; Qi Li
- Inventors: Caihong Xing; Jianfeng Wang; Zhaojie Wei; Jun Ma; Ching-Jung Tsai; Qi Li
- Web page: https://patentgrep.com/patent/US8540902B2

## CPC

- H01B 1/24: the conductive material comprising carbon-silicon compounds, carbon or silicon
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- C09D 5/24: Electrically-conducting paints {(conductive materials H01B1/00)}
- C09D 7/45: Anti-settling agents
- C09D 7/61: inorganic
- C09D 7/67: {Particle size smaller than 100 nm}
- C09D 7/70: {characterised by shape, e.g. fibres, flakes or microspheres}
- C09D 139/06: Homopolymers or copolymers of N-vinyl-pyrrolidones
- C08K 3/041: {Carbon nanotubes}
- H01M 4/625: {Carbon or graphite}
- Y02E 60/10: Energy storage using batteries
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Carbon-nanotube based pastes and methods for making and using the same are disclosed. Carbon nanotubes are dispersed via milling; resultant paste has Hegman scale of greater than 7. The pastes can be used as electro-conductivity enhancement in electronic devices such as batteries, capacitors, electrodes or other devices needing high conductivity paste.

## Claims

### Claim 1

A battery electrode coating composition consisting of:
multi-walled carbon nanotubes of diameter greater than 4 nm;
a dispersant chosen from a group consisting of poly(vinylpyrrolidone) (PVP), poly(styrene sulfonate) (PSS), poly(phenylacetylene) (PAA), poly(meta-phenylenevinylene) (PmPV), polypyrrole (PPy), poly(p-phenylene benzobisoxazole) (PBO), natural polymers, amphiphilic materials in aqueous solutions, anionic aliphatic surfactant, sodium dodecyl sulfate (SDS), cyclic lipopeptide biosurfactant, surfactin, water-soluble polymers, carboxyl methyl cellulose, hydroxyl ethyl cellulose, poly(vinyl alcohol), PVA, sodium dodecyl sulfate, SDS, polyoxyethylene surfactant, poly(vinylidene fluoride), PVdF, carboxyl methyl cellulose (CMC), hydroxyl ethyl cellulose (HEC), polyacrylic acid (PAA), polyvinyl chloride (PVC) and combinations thereof;
a liquid vehicle chosen from a group consisting of water, alcohols, ethers, aromatic hydrocarbons, esters, ketones, n-methyl pyrrolidone and mixtures thereof;
lithium ion battery electrode materials chosen from a group consisting of lithium, oxygen, phosphorous, sulphur, nitrogen, nickel, cobalt, manganese, vanadium, silicon, carbon, aluminum, niobium and zirconium and iron;
and wherein a paste composition consisting of the multi-walled carbon nanotubes, the dispersant and the liquid vehicle which has carbon nanotubes present in the range of about 1 to 15% by weight, a bulk electrical resistivity of about 10−1 Ω-cm or less, and a viscosity greater than about 5,000 cps, is present in a range from about 2% to about 50% by weight of the coating composition.

### Claim 2 (depends on 1)

The battery electrode coating composition of claim 1 further consisting of a polymeric binder.

### Claim 3 (depends on 1)

The battery electrode coating composition of claim 1 wherein the battery electrode coating composition is contacting a metallic surface to form an electrode for a lithium ion battery and the liquid vehicle is removed.