Negative electrode material for secondary battery, negative electrode for secondary battery, and secondary battery

A secondary battery and negative electrode material technology, applied in the direction of secondary batteries, battery electrodes, negative electrodes, etc., can solve problems such as shedding, negative electrode active material rupture, cycle characteristics and initial Coulombic efficiency degradation, etc.

Pending Publication Date: 2021-03-19
SEKISUI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when Si is used as the negative electrode active material, the volume change due to charging and discharging is extremely large, and the negative electrode active material may be cracked and may fall off from the electrode.
Therefore, the cycle characteristics and initial coulombic efficiency during charge and discharge may deteriorate

Method used

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  • Negative electrode material for secondary battery, negative electrode for secondary battery, and secondary battery
  • Negative electrode material for secondary battery, negative electrode for secondary battery, and secondary battery

Examples

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Effect test

preparation example Construction

[0108] As a preparation method of the negative electrode, for example, a method of forming a mixture of a negative electrode active material, a carbon material, and a binder resin on a current collector is mentioned.

[0109] From the viewpoint of easier production of the negative electrode, the following production method is preferable. First, a binder solution or a dispersion liquid is added to a negative electrode active material containing a metal or a metal compound, a first carbon material, and a second carbon material, and mixed to prepare a slurry. Next, the prepared slurry was coated on a current collector, and finally a negative electrode was prepared by removing the solvent.

[0110] As a preparation method of the said slurry, the method of mixing using a stirrer etc. is mentioned. It does not specifically limit as a stirrer used for mixing, A planetary mixer, a disperser, a thin-film rotary mixer, a jet mixer, an autorotation-revolution mixer, etc. are mentioned. ...

Embodiment 1

[0142] Silicon particles as a metal or a metal compound, graphite particles as a first carbon material, the second carbon material produced in accordance with the above-mentioned production example, and polyamic acid as a precursor of the binder resin were calculated according to the weight ratio (silicon particles: the first One carbon material: second carbon material: polyamic acid)=13.1:74.4:2.5:10.0 were mixed to prepare a mixture. As silicon particles, a product manufactured by ALDRICH Corporation (average particle diameter: <100 nm) was used. As the graphite particles, those manufactured by OSAKA GASCHEMICAL Co., Ltd. under the trade name "OMAC-R" (average particle diameter: 18 μm) were used. In addition, as the polyamic acid, a product made by Ube Industries, Ltd. and a product name "U-VARNISH-A" was used.

[0143] Next, to the obtained 5 g mixture, an appropriate amount of N-methylpyrrolidone (NMP) was added as a solvent, and stirred and mixed using a self-rotating an...

Embodiment 2～4

[0146] Except that the weight ratio of silicon particles (Si, metal or metal compound), first carbon material, second carbon material, and polyamic acid (adhesive resin precursor) is changed according to the following Table 1, it is the same as Example 1 , to obtain the negative electrode sheet.

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Abstract

Provided is a negative electrode material for a secondary battery that can inhibit deterioration of cycle characteristics during charging and discharging of a secondary battery and that can increase initial coulombic efficiency. This negative electrode material for a secondary battery has a capacitance of 400 mAh / g or more and comprises: a negative electrode active material that contains a metal or a metal compound that is capable of storing and discharging alkali metal ions or alkali earth metal ions, and a first carbon material; and a conductive auxiliary agent that contains a second carbonmaterial that is different from the first carbon material. The second carbon material is a partially-exfoliated graphite which has a graphite structure from which graphite has been partially exfoliated.

Description

technical field [0001] The present invention relates to a negative electrode material for secondary batteries containing a negative electrode active material and a conductive additive, a negative electrode for secondary batteries using the negative electrode material for secondary batteries, and a secondary battery. Background technique [0002] In the past, research and development on secondary batteries has been very popular for portable devices, hybrid vehicles, electric vehicles, and household power storage. As such a negative electrode active material for secondary batteries, Si having a high theoretical capacity has attracted attention. However, when Si is used for the negative electrode active material, the volume change accompanying charging and discharging is extremely large, and the negative electrode active material may be cracked and may fall off from the electrode. For this reason, cycle characteristics and initial coulombic efficiency during charge and dischar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133C01B32/225C01B33/02H01M4/134H01M4/36H01M4/48H01M4/62
CPCC01B32/225H01M4/133H01M4/134Y02E60/10C01B32/21H01M4/625H01M4/587H01M4/386H01M4/366H01M4/364H01M10/0525H01M10/054H01M4/485H01M4/5825H01M2004/021H01M2004/027
Inventor 孙仁德野里省二中寿贺章
Owner SEKISUI CHEM CO LTD
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