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Negative electrode paste, negative electrode and method for manufacturing negative electrode, and non-aqueous electrolyte secondary battery

A technology of non-aqueous electrolyte and negative electrode slurry, which is applied in the direction of non-aqueous electrolyte battery electrodes, electrode manufacturing, and secondary batteries. Productivity, effect of suppressing dimensional change

Inactive Publication Date: 2013-04-03
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are problems in the cycle characteristics as follows: Since the volume expansion of the silicon-based negative electrode active material due to charging and discharging is larger than that of graphite, polyvinylidene fluoride (polyvinylidene fluoride, PVDF) resin or styrene-butadiene rubber ( Styrene-butadiene rubber, SBR) and other effective binders in graphite, cannot suppress the volume expansion of silicon-based negative electrode active materials, and each time the charge and discharge are repeated, the negative electrode active materials are separated from the collector, so they cannot be used as secondary batteries and play a role

Method used

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  • Negative electrode paste, negative electrode and method for manufacturing negative electrode, and non-aqueous electrolyte secondary battery
  • Negative electrode paste, negative electrode and method for manufacturing negative electrode, and non-aqueous electrolyte secondary battery
  • Negative electrode paste, negative electrode and method for manufacturing negative electrode, and non-aqueous electrolyte secondary battery

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Experimental program
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Effect test

Embodiment 1）

[0125]

[0126] 100g average particle size is 5μm, BET specific surface area is 3.5m 2 / g silicon oxide SiO x (x=1.01) into the batch heating furnace. The inside of the furnace is depressurized by an oil rotary vacuum pump, and the temperature is raised to 1,100°C. After reaching 1,100°C, CH 4 The gas was flowed in at 0.3 NL / min, and the carbon covering treatment was carried out for 5 hours. In addition, the degree of vacuum at this time was 800 Pa. Cool down after treatment to obtain 97.5g of SiO covered by carbon 2 Black particles in which Si particles are dispersed. The obtained black particles are conductive particles with an average particle size of 5.2 μm and a BET specific surface area of ​​6.5 m 2 / g, and the carbon coverage of the black particles was 5.1% by mass.

[0127]

[0128] Pour nitrogen into a 2L four-necked flask, and charge 192.0g (1.0 mole) of trimellitic anhydride as polyvalent carboxylic acid anhydride, and charge 250.0g (1.0 mole) of 4,4'-diph...

Embodiment 2）

[0143] Adjust the negative electrode slurry of the present invention, use 0.01 mass parts (relative to binder is 0.1 mass %) PP13-TFSI as ionic liquid, in addition, manufacture negative electrode and non-aqueous electrolyte under the same conditions as in Example 1 Secondary batteries, and various evaluations.

Embodiment 3）

[0145] Adjust the negative electrode slurry of the present invention, use 0.1 mass parts (relative to binder is 1.0 mass %) PP13-TFSI as ionic liquid, in addition, manufacture negative electrode and non-aqueous electrolyte under the same conditions as in Example 1 Secondary batteries, and various evaluations.

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Abstract

The present invention provides a negative electrode paste that can suppress an entire negative electrode from curling when a negative electrode paste is coated on a current collector and dried, and can produce a negative electrode having excellent cycle characteristics and large battery capacity. To achieve the object, the invention provides a negative electrode paste that is used to manufacture a negative electrode of a non-aqueous electrolyte secondary battery including: (A) a silicon-based negative electrode active material; (B) a binder containing at least one of a polyimide resin and a polyamideimide resin; and (C) an ionic liquid. As a result, there is provided a negative electrode paste that

Description

technical field [0001] The present invention relates to a negative electrode slurry, a negative electrode using the negative electrode slurry, a manufacturing method thereof, and a nonaqueous electrolyte secondary battery. Background technique [0002] In recent years, with the rapid development of mobile devices and the rise of electric vehicles, there has been an increasing demand for increased capacity, reduced size and weight, and improved safety of secondary electrical components. In particular, lithium-ion secondary batteries (lithium-ion rechargeable batteries) are widely used as secondary electric elements because of their light weight, high voltage, and large capacity. [0003] At present, graphite materials are mainly used as anode materials for lithium-ion secondary batteries. However, due to the small battery capacity per unit weight of the graphite negative electrode material, it cannot fully meet the requirements for increasing the battery capacity as describe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M4/139
CPCH01M4/0404H01M4/134H01M4/1395H01M4/386H01M4/62H01M4/622H01M10/0525Y02E60/10H01M4/02H01M4/13H01M4/38
Inventor 池田达彦宫胁悟
Owner SHIN ETSU CHEM IND CO LTD
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