Hybrid negative plate for lead-acid storage battery and lead-acid storage battery

• US 9,508,493 B2
• Filed: 08/26/2010
• Issued: 11/29/2016
• Est. Priority Date: 08/27/2009
• Status: Active Grant

• Current Assignee: Commonwealth Scientific & Industrial Research Organisation (Commonwealth Of Australia As Represented By Department Of Industry, Innovation, Climate Change, Science, Research And Tertiary Education), Furukawa Battery Company Limited (Furukawa Electric Company Limited)
• Original Assignee: Commonwealth Scientific & Industrial Research Organisation (Commonwealth Of Australia As Represented By Department Of Industry, Innovation, Climate Change, Science, Research And Tertiary Education), Furukawa Battery Company Limited (Furukawa Electric Company Limited)
• Inventors: Jun, Furukawa, Momma, Daisuke, Masuda, Yosuke, Dobashi, Akira, Lam, Lan Trieu, Louey, Rosalie, Haigh, Nigel Peter
• Primary Examiner(s): Ridley, Basia
• Assistant Examiner(s): WILMOT, CAITLIN M
• Application Number:
  US13/392,734
• Publication Number:
  US 20120258336A1
• Time in Patent Office: 2,287 Days
• Field of Search: 429209-246, 429/208, 296231-6235
• US Class Current: 1/1
• CPC Class Codes: H01G 11/24 characterised by structural features of the materials making up or comprised in the electrodes, e.g. form, surface area or porosity; characterised by the structural features of powders or particles used therefor
• CPC Class Codes: H01G 11/34 characterised by carbonisation or activation of carbon
• CPC Class Codes: H01G 11/38 Carbon pastes or blends; Binders or additives therein
• CPC Class Codes: H01G 11/42 Powders or particles, e.g. composition thereof
• CPC Class Codes: H01M 4/14 Electrodes for lead-acid accumulators
• CPC Class Codes: H01M 4/625 Carbon or graphite
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

[Problem] To provide a hybrid negative plate for a lead-acid storage battery, that inhibits decrease in hydrogen gas evolution potential and improves rapid discharge cycle characteristics in PSOC.

[Means for Resolution] In a hybrid negative plate for a lead-acid storage battery, comprising a negative electrode active material-filled plate having formed on the surface thereof a coating layer of a carbon mixture comprising a carbon material for ensuring conductivity, activated carbon for ensuring capacitor capacity and/or pseudocapacitor capacity, and at least a binder, activated carbon modified with a functional group is used as the activated carbon. Preferably, activated carbon modified with an acidic surface functional group is used.

Claims

1. A hybrid negative plate for a lead-acid storage battery, comprising

a negative electrode active material-filled plate having formed on the surface thereof a coating layer of a carbon mixture comprising a carbon material for ensuring conductivity,

an activated carbon for ensuring capacitor capacity and/or pseudocapacitor capacity, and

at least a binder,

wherein the activated carbon is modified with an acidic functional group such that a total amount of acidic functional groups is in an amount of 0.16 to 0.489 μ

mol/m² per 1 g of the activated carbon, being a value obtained by dividing the amount of the acidic surface functional group by a specific surface area of 1 g of the activated carbon.

2. The hybrid negative plate for a lead-acid storage battery according to claim 1, wherein the carbon mixture comprises 5 to 70 parts by weight of the carbon material, 20 to 80 parts by weight of the activated carbon modified with a functional group, 1 to 20 parts by weight of the binder, 0 to 10 parts by weight of a thickener, and 0 to 10 parts by weight of a short fiber-like reinforcement.

3. The hybrid negative plate for a lead-acid storage battery according to claim 1, wherein an amount of the carbon mixture applied to the surface of the negative electrode active material-filled plate is 15 parts by weight or less relative to 100 parts by weight of the negative electrode active material.

4. The hybrid negative plate for a lead-acid storage battery according to claim 1, wherein the carbon mixture coating layer has a porosity of 40 to 90%.

5. The hybrid negative plate for a lead-acid storage battery according to claim 1, wherein the carbon mixture coating layer has a thickness of 0.1 mm or less.

6. A lead-acid storage battery comprising the hybrid negative plate according to claim 1.

7. The hybrid negative plate for a lead-acid storage battery according to claim 1, wherein the acidic functional group comprises at least one group selected from a carboxyl group, a lactone group, and a phenolic hydroxyl group.