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Composition for forming secondary cell electrode, secondary cell electrode, and secondary cell

A secondary battery and composition technology, applied in the direction of secondary batteries, battery electrodes, non-aqueous electrolyte storage battery electrodes, etc., can solve the problems of insufficient improvement of electrode flexibility, insufficient improvement of adhesion, etc., to achieve charging and discharging Excellent cycle characteristics

Inactive Publication Date: 2014-10-22
TOYO INK SC HOLD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] However, the adhesiveness cannot be sufficiently improved by these methods, and further improvement is required.
In addition, the improvement of electrode flexibility is not sufficient

Method used

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  • Composition for forming secondary cell electrode, secondary cell electrode, and secondary cell
  • Composition for forming secondary cell electrode, secondary cell electrode, and secondary cell
  • Composition for forming secondary cell electrode, secondary cell electrode, and secondary cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0190] 45 parts of LiFePO as the positive active material 4 , 2.5 parts of acetylene black (Denka Black HS-100), 50 parts (1 part as solid content) of carboxymethyl cellulose 2% by weight as the carbon material of the conduction aid are put into the mixer and mixed, and further mixed into 2 parts of water-soluble additive MTG (triethylene glycol monomethyl ether), 2.5 parts of binder (polytetrafluoroethylene 30-J, 60% aqueous dispersion, manufactured by Mitsui DuPont Flowro Chemical Co., Ltd.), so that the final solid content It adjusted so that it may become about 50 weight%, and the composite material ink for positive electrode secondary battery electrodes was obtained. The degree of dispersion of the composite ink as a positive electrode secondary battery electrode was determined by the following method.

[0191] Furthermore, this composite ink for positive secondary battery electrodes was coated on an aluminum foil with a thickness of 20 μm as a current collector with a d...

Embodiment 2～9

[0194] [Examples 2-9], [Comparative Examples 1-10]

[0195] Using the active material shown in Table 1, the carbon material as a conductive additive, and the water-soluble additive, a composite ink for a positive electrode secondary battery electrode and a positive electrode were obtained by the same procedure as in Example 1, and were evaluated in the same manner. At this time, the composite ink for a positive electrode secondary battery electrode using the active material LCO, LMO, or NMC is also adjusted so that the final solid content becomes about 50% by weight.

Embodiment 19

[0197] 45 parts of LiFePO as the positive active material 4 , 2.5 parts of acetylene black (Denka Black HS-100), 50 parts (1 part as solid content) of carboxymethyl cellulose 2% by weight as the carbon material of the conduction auxiliary agent are charged into a mixer and mixed, and further mixed into 0.25 parts of water-soluble additive MTG, 2.5 parts of binder (polytetrafluoroethylene 30-J, 60% aqueous dispersion, manufactured by Mitsui Dupont Fluro Chemical Co., Ltd.), adjusted so that the final solid content reaches about 50% by weight , obtained composite ink for positive secondary battery electrode.

[0198] Furthermore, this composite ink for positive secondary battery electrodes was coated on an aluminum foil with a thickness of 20 μm as a current collector with a doctor blade, and then heated and dried under reduced pressure to adjust the thickness of the electrode to 100 μm. The flexibility of the electrodes was evaluated by the method described later.

[0199] Fu...

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Abstract

It is possible to form a secondary cell having excellent charge-discharge cycle properties and to improve dispersibility of the active substance and the auxiliary conductor and pliability and close adhesion of the electrodes by using a composition for forming a secondary cell electrode that comprises at least one of an electrode active substance (A) and a carbon material (B) that serves as an auxiliary conductor, a water-soluble additive (C) that is a water-soluble additive formed from carbon atoms, oxygen atoms, and hydrogen atoms and that has 2 to 20 oxygen atoms per 1 molecule, and water (D).

Description

technical field [0001] The present invention relates to a composition for forming a secondary battery electrode, an electrode obtained using the composition, and a secondary battery obtained using the electrode. Background technique [0002] In recent years, small portable electronic devices, such as digital cameras and cellular phones, have been widely used. In general, these electronic devices are required to minimize the volume and reduce the weight, and the mounted batteries are required to be small, lightweight, and high-capacity. Furthermore, it is also desired to realize a large secondary battery in place of a conventional lead acid storage battery for a large secondary battery for use in an automobile or the like. [0003] In order to respond to such demands, the development of secondary batteries such as lithium ion secondary batteries and alkaline secondary batteries, for example, the development of composite material ink (composite material ink) used for forming ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/62H01M4/02
CPCH01M4/583H01M4/625H01M4/13H01M4/02H01M4/62C09D11/52Y02E60/10H01M4/04H01M4/621H01M4/366H01M4/505H01M4/525H01M4/5825H01M10/0525
Inventor 诸石顺幸春田一成八手又彰彦
Owner TOYO INK SC HOLD CO LTD
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