Lithium ion secondary cell negative electrode material and method for manufacturing same

A secondary battery and negative electrode material technology, applied in the direction of secondary batteries, battery electrodes, negative electrodes, etc., can solve the problems of increased internal resistance, large expansion rate and shrinkage rate, and disconnection of electrical contacts, so as to achieve low-cost acquisition and increase Energy density, the effect of reducing resistance

Inactive Publication Date: 2017-05-10
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, negative electrode materials such as Si have large expansion and contraction rates associated with the storage (intercalation) and release (deintercalation) of lithium ions.
Therefore, gaps are generated between the particles, and the expected level of capacity cannot be obtained
In addition, due to repeated large expansion and contraction, the particles are broken and micronized, resulting in disconnection of electrical contacts and increase in internal resistance, so the resulting lithium-ion secondary battery has a short charge-discharge cycle life

Method used

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  • Lithium ion secondary cell negative electrode material and method for manufacturing same
  • Lithium ion secondary cell negative electrode material and method for manufacturing same
  • Lithium ion secondary cell negative electrode material and method for manufacturing same

Examples

Experimental program
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Effect test

Embodiment 1

[0126] 3.1 g of Si particles [90% of the particle diameter in the volume-based cumulative particle size distribution is 200 nm or less] and carbon nanotubes (VGCF-XA (registered trademark): manufactured by Showa Denko Co., Ltd.; 95% or more of the fiber diameter of all fibers 2 nm to 40 nm and an aspect ratio of 10 to 15000) 1.3 g with a pulverizer (NOBILTA (trademark): manufactured by Hosokawa Micron Co., Ltd.. NOB-MINI) with an initial output power of 300 W (relative to the sample The unit volume is 4.3W / cm 3 ) was mechanochemically treated for 5 minutes to obtain a mechanochemically treated product (1) containing Si particles and carbon nanotubes. In this processed product, a three-dimensional entangled network structure formed of carbon nanotubes in which aggregates of carbon nanotubes were dispersed was formed, and Si particles were fused to the carbon nanotubes constituting the structure. Figure 1 ~ Figure 4A TEM image showing the fusion state of Si particles and carbo...

Embodiment 2

[0142] 5.0 g of Si particles [90% particle diameter in volume-based cumulative particle size distribution is 200 nm or less] and 0.6 g of carbon nanotubes (VGCF-XA (registered trademark): manufactured by Showa Denko Co., Ltd.) were used in a pulverizer (NOBILTA (trademark) : Hosokawa Micron Co., Ltd. product. NOB-MINI) was mechanochemically treated for 5 minutes to obtain a mechanochemically treated product (2) containing Si particles and carbon nanotubes. The processed product (2) has a three-dimensional entangled network structure formed of carbon nanotubes in which aggregates of carbon nanotubes are dispersed, and Si particles are fused to the carbon nanotubes constituting the structure.

[0143] 1.8 g of the treated product (2) and 13.5 g of graphite particles (SCMG (trademark): manufactured by Showa Denko Co., Ltd.) were crushed for 5 days with a pulverizer (NOBILTA (trademark): manufactured by Hosokawa Micron Co., Ltd.. NOB-MINI) minutes of mechanochemical treatment to o...

Embodiment 3

[0147] 3.1 g of Si particles [90% particle diameter in volume-based cumulative particle size distribution is 800 nm] and 1.3 g of carbon nanotubes (VGCF-XA (registered trademark): manufactured by Showa Denko Co., Ltd.) were used in a pulverizer (NOBILTA (trademark): Hosokawa Micron Co., Ltd. Manufactured. NOB-MINI) with an initial output power of 300W (4.3W / cm with respect to the unit volume of the sample 3 ) was mechanochemically treated for 5 minutes to obtain a mechanochemically treated product (3) containing Si particles and carbon nanotubes. The processed product (3) has a three-dimensional entangled network structure formed of carbon nanotubes in which aggregates of carbon nanotubes are dispersed, and Si particles are fused to the carbon nanotubes constituting the structure.

[0148] Next, 1.3 g of the aforementioned mechanochemically treated product (3) and 7.8 g of graphite particles (SCMG (trademark): manufactured by Showa Denko Co., Ltd.) were crushed with a pulveriz...

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Abstract

A lithium ion secondary cell negative electrode material is obtained in the present invention. The negative electrode material contains: particles (A) containing elements other than elemental carbon that are capable of storing and emitting lithium ions; graphite particles (B) that are capable of storing and emitting lithium ions, the median in the reference distribution for the primary particle aspect ratio as relates to the graphite particles (B) being 1.4-3.0; and carbon fibers (C). A three-dimensionally interwoven net structure is formed using one or more of the carbon fibers (C). The particles (A) are fused to the structure, and the structure is fused to at least a portion of the surface of the graphite particles (B). A lithium ion secondary cell is obtained using the negative electrode material.

Description

technical field [0001] The invention relates to a negative electrode material for a lithium ion secondary battery and a manufacturing method thereof. More specifically, the present invention relates to a negative electrode material for lithium ion secondary batteries that has high energy density and can achieve both high initial capacity and high capacity retention rate, and a method suitable for manufacturing the negative electrode material for lithium ion secondary batteries. Background technique [0002] Multifunctionalization of portable electronic devices is progressing faster than power saving of electronic components, leading to an increase in power consumption of portable electronic devices. Therefore, there is a strong demand for increasing the capacity and miniaturization of lithium-ion secondary batteries, which are the main power sources of portable electronic devices, beyond the existing levels. In addition, demand for electric vehicles has increased, and lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/36H01M4/38H01M4/62
CPCH01M4/587Y02E60/10H01M2004/027H01M4/364H01M4/625H01M10/0525H01M4/386H01M4/133H01M4/134C04B35/80C04B2235/428C04B2235/5445C04B2235/5288C04B2235/5264C04B2235/5296C04B35/6261C04B2235/425C04B2235/5436C04B2235/5463C04B35/522C01B32/90H01M4/362H01M4/38H01M4/62Y02P70/50H01M4/36C04B35/62685C04B35/83C04B2235/96H01M2004/021
Inventor 栗田贵行松尾明石井伸晃
Owner SHOWA DENKO KK
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