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Lithium ion secondary battery negative electrode slurry composition, a lithium ion secondary battery negative electrode, and lithium ion secondary battery

A secondary battery and lithium ion technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of increasing plate density, deteriorating input and output characteristics, and low crystallinity, so as to improve the bonding strength and life span Characteristics, absorption-enhancing effects

Inactive Publication Date: 2012-12-12
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphite-based carbon materials have a small specific surface area and high initial charge-discharge efficiency. However, there are problems such as that the theoretical capacity of 372Ah / kg or more cannot be obtained, and the input-output characteristics deteriorate.
On the other hand, amorphous carbon materials have low reactivity with electrolytes and are less likely to generate dendritic metal lithium. Therefore, they have excellent input-output characteristics and can obtain materials with a discharge capacity per unit mass of 500 Ah / kg or more. However, the Low crystallinity, compared with graphite-based carbon materials, it is difficult to increase the density of the plate through rolling processes such as rolling
As a result, there is a problem that the adhesion strength of the electrode plate is reduced in order not to damage the contact area between the active material particles.

Method used

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  • Lithium ion secondary battery negative electrode slurry composition, a lithium ion secondary battery negative electrode, and lithium ion secondary battery
  • Lithium ion secondary battery negative electrode slurry composition, a lithium ion secondary battery negative electrode, and lithium ion secondary battery
  • Lithium ion secondary battery negative electrode slurry composition, a lithium ion secondary battery negative electrode, and lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0165] (Manufacture of Adhesives)

[0166] Add 46 parts of styrene, 49 parts of 1,3-butadiene, 5 parts of methacrylic acid, 5 parts of sodium dodecylbenzenesulfonate, 150 parts of ion-exchanged water, 1 part of potassium persulfate as a polymerization initiator was stirred sufficiently, and then heated to 50° C. to initiate polymerization. Cool when the monomer consumption reaches 95.0%, terminate the reaction, and obtain a diene-based polymer particle dispersion (the number-average particle diameter of the polymer particles: 100 nm, polymerized The glass transition temperature of the material particle: -15°C). It should be noted that, in the monomer composition used to obtain diene polymer particles, 5% by mass of monocarboxylic acid monomer (methacrylic acid) was included, and the amount of surface acid groups per 1 g of polymer particles was 0.30 mmol.

[0167] (Manufacture of slurry composition for negative electrode of lithium ion secondary battery)

[0168] Carboxyme...

Embodiment 2

[0176] The thickener was replaced by carboxymethyl cellulose with a degree of polymerization of 1420 and a degree of etherification of 0.7, except that the same operation as in Example 1 was carried out to make a slurry composition, negative electrode and half-cell, and to It evaluates. The results are shown in Table 1.

Embodiment 3

[0178] (Manufacture of Adhesives)

[0179] Add 50 parts of styrene, 48.5 parts of 1,3-butadiene, 1.5 parts of methacrylic acid, 5 parts of sodium dodecylbenzenesulfonate, 150 parts of ion-exchanged water, 1 part of potassium persulfate as a polymerization initiator was stirred sufficiently, and then heated to 50° C. to initiate polymerization. Cool when the monomer consumption reaches 95.0%, terminate the reaction, and obtain a diene-based polymer particle dispersion (number-average particle diameter of the polymer particle: 105 nm, polymerized The glass transition temperature of the material particle: -18°C). It should be noted that, in the monomer composition used to obtain diene-based polymer particles, 1.5% by mass of monocarboxylic acid monomer (methacrylic acid) was included, and the amount of surface acid groups per 1 g of polymer particles was 0.11 mmol.

[0180] Except for using the above-mentioned binder, the same operation as in Example 1 was carried out to prepa...

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Abstract

A lithium ion secondary battery negative electrode slurry composition comprising a negative electrode active material, a thickening agent, a binder of polymer particles and water, wherein the negative electrode active material includes a carbon material and the carbon material has a graphite interlayer distance (an interplanar spacing (d value) of the (002) plane as determined by an X-ray diffraction method) of 0.340 to 0.370 nm, the thickening agent is a polymer having a degree of polymerization of 1400 to 3000, the polymer particles are obtained by polymerizing a monomer composition including 1 to 10 wt % of a monocarboxylic acid monomer, and an amount of acid groups on the surface of the polymer particles as determined by a conductivity titration is 0.1 to 1.0 mmol per 1 g of the polymer particles.

Description

technical field [0001] The present invention relates to a slurry composition for a negative electrode of a lithium ion secondary battery, a negative electrode of a lithium ion secondary battery and a lithium ion secondary battery. Background technique [0002] In recent years, to reduce CO 2 For the purpose of reducing emissions and improving fuel consumption, research and development and commercialization of hybrid electric vehicles (HEV) using both engines and motors as power sources have been carried out worldwide. One of the issues for HEVs is the development of high-output, small, lightweight, and low-cost batteries. Currently, nickel / hydrogen secondary batteries are used, but there are problems in input / output characteristics and energy density. Therefore, a lithium-ion secondary battery having high voltage, high energy density, and excellent input-output characteristics can be reduced in size and weight, and high expectations can be placed on batteries for HEVs. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393H01M10/0525H01M10/0566H01M4/133H01M4/587H01M4/62
CPCH01M4/133Y02E60/122H01M4/621H01M4/587Y02E60/10H01M4/1393H01M4/62
Inventor 小林佳
Owner ZEON CORP
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