Negative electrode active material for rechargeable battery, method for producing same, and rechargeable battery

A negative electrode active material and secondary battery technology, applied in active material electrodes, battery electrodes, negative electrodes, etc., can solve problems such as capacity degradation, fragmentation, and lithium ion reduction, and achieve the effect of increasing specific capacity

Pending Publication Date: 2021-06-01
SHINSHU UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is known that when silicon is used as the negative electrode material of the secondary battery, the cracking of the active material particles accompanying the charge-discharge cycle of the secondary battery or the capacity deterioration due to poor contact with the conductive additive are known to occur.
In addition, it is also known that due to the formation of a film during the first (initial) charging reaction and the activation reaction accompanied by the fragmentation of the active material, the accompanying Li 4 SiO 4 The generation of irreversible capacity, the reduction of lithium ions in the positive electrode, and the deterioration of the capacity

Method used

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  • Negative electrode active material for rechargeable battery, method for producing same, and rechargeable battery
  • Negative electrode active material for rechargeable battery, method for producing same, and rechargeable battery
  • Negative electrode active material for rechargeable battery, method for producing same, and rechargeable battery

Examples

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Effect test

Embodiment 1

[0071]The negative electrode having a negative electrode active material having a secondary battery as in Example 1 was fabricated by the following steps (steps 1 to 5).Figure 4 (a) ~ (d) is a diagram for a schematic description for each step.

[0072][Process 1]

[0073]First of all, ifFigure 4 (a), the multi-layer carbon nanotube (MWCNT) 105A is stored at room temperature in the container V2Water in (H2O) Mixing, allowing 9% by weight to prepare a mixture of multi-layer carbon nanotubes 105a3Carboxyl groups (-COOH) are formed on the surface of the multilayer carbon nanotubes 105a. As the multilayer carbon nanotube 105a, a length of 500 to 700 nm is used, a diameter of 15 to 20 nm, and a plurality of layers of carbon nanotubes having a layer of 15-18 are used.

[0074][Process 2]

[0075]Further, at room temperature, the weight ratio of 33% is mixed with a silicon-containing silicon complex 103 containing graphite than the silicon complex 103 containing graphite than the silicon complex 103, w...

Embodiment 2

[0082]As the negative electrode of the secondary battery, the negative electrode active material for the second embodiment is made only by changing the steps of the step 1 of the first embodiment. That is, in the step 1, a plurality of layers of carbon nanotubes and 1.5 mg of powdery EDC are mixed with water stored in the container, and the mixed liquid L is prepared.7. The steps of other steps were the same as in Example 1.

Embodiment 3

[0084]As the negative electrode of the negative electrode active material for the secondary battery, the negative electrode having the secondary battery is made in the same steps as in Example 1. However, the mixed organosilane is 200 μL.

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Abstract

A negative electrode active material for a rechargeable battery comprises: a silicon composite containing a silicon compound and at least one carbon material selected from among graphite, graphitization-resistant carbon and soft carbon; a self-assembled monomolecular film which covers the surface of the silicon composite and which has an amino group; and a carbon compound containing carbon atoms as the principal component thereof, the carbon compound being bonded to the self-assembled monomolecular film with an amino group interposed therebetween.

Description

Technical field[0001]The present invention relates to a negative electrode active substance for secondary batteries and a method of manufacturing the same, and a secondary battery.[0002]The present application is based on the provisions of Japanese Application No. 2018-219705, requested by Japanese November 22, 2018, and hereby invoke its content.Background technique[0003]In order to achieve high energy density of lithium ion batteries, the alloy material such as silicon is received as a new material of the graphite in place of the conventional negative electrode material (eg, Non-Patent Documents 1 to 3). Compared with graphite, the specific capacity of silicon is close to 4 times, on the other hand, the volume expansion when lithium ions are absorbed. Therefore, in the case where silicon is used as a negative electrode material of the secondary battery, it can cause crushing of the active material particles accompanying the charge and discharge circulation of the secondary battery...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/587
CPCY02E60/10H01M4/366H01M4/364H01M4/625H01M4/134H01M4/1395B82Y30/00H01M4/386H01M4/483H01M4/587H01M4/62C01B32/168H01M2004/027
Inventor 是津信行手嶋胜弥金慧玟
Owner SHINSHU UNIVERSITY
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