Negative active material for secondary battery, process for producing same, and negative electrode and lithium-ion battery both obtained using same

A negative electrode active material, silicon oxide technology, applied in the field of lithium-ion batteries, can solve the problems of insufficient productivity, insufficient capacity, and inability to fully utilize the characteristics of silicon-based materials, and achieve excellent charge-discharge capacity and cycle characteristics. Effect

Inactive Publication Date: 2015-03-11
JNC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, the characteristics of silicon-based materials cannot be fully utilized, and the capacity is not sufficient
In addition, when an electrode is obtained by mixing a silicon-containing compound with a silicon-free organic compound, etc., the production method is not sufficient in terms of productivity.

Method used

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  • Negative active material for secondary battery, process for producing same, and negative electrode and lithium-ion battery both obtained using same
  • Negative active material for secondary battery, process for producing same, and negative electrode and lithium-ion battery both obtained using same
  • Negative active material for secondary battery, process for producing same, and negative electrode and lithium-ion battery both obtained using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0113] Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated more concretely, this invention is not limited to these Examples.

[0114] In this example, various analyzes and evaluations were performed on the silicon oxide-based composite materials, silica, and the like prepared in Examples 1 to 5, and Comparative Examples 1 and 2.

[0115] In addition, in the formula, Ph represents a phenyl group, and Me represents a methyl group.

[0116] In addition, the measuring devices and measuring methods of "X-ray diffraction measurement", "elemental analysis measurement", "laser Raman spectroscopy measurement" and "X-ray small-angle scattering measurement" and "battery characteristics" in each example and comparative example evaluation", as described below.

[0117] (measured by X-ray diffraction method)

[0118] X-ray diffraction is using Bruker AXS (Bruker AXS) (stock) D8 Discover as the X-ray diffraction device, by capillary metho...

Synthetic example 1

[0135] Synthesis of Octaphenylsilsesquioxane (10)

[0136]360 ml of toluene (Wako Pure Chemical Industry), 42.2 g of tetrabutylammonium hydroxide (Tokyo Chemical Industry) (37% tetrabutylammonium hydroxide (Tetrabutylammonium Hydroxide, TBAH) in MeOH), pure 16.2 g of water, stirred and cooled in an ice bath. 360 ml of diethyl ether (Wako Pure Chemical Industry) and 118.9 g of phenyltrimethoxysilane (Tokyo Chemical Industry) were put into a 500 ml dropping funnel, and were added dropwise over 5 minutes. After the dropwise addition, the ice bath was removed, and the mixture was stirred at room temperature for 70 hours. After 70 hours, filter by means of a pressure filter.

[0137] The obtained powder was transferred to a beaker, washed with toluene, and filtered under pressure again. After filtration, it dried under reduced pressure at 120 degreeC for 6 hours with the vacuum drier, and obtained 14.3 g of octaphenylsilsesquioxane (10).

Synthetic example 2

[0139] (PhSiO 3 / 2 ) n Synthesis

[0140] Into a 500 ml four-necked flask, 99.1 g of phenyltrimethoxysilane (Tokyo Chemical Industry) and 16 g of methanol (Wako Pure Chemical Industries) were charged. While stirring at room temperature, 36 g of 1N HCl was slowly added dropwise through the dropping funnel over 30 minutes. After completion of the dropwise addition, it was heated and stirred at 60° C. for 2 hours. After cooling for 2 hours, 200 g of toluene (Wako Pure Chemical Industry) was added dropwise.

[0141] Then, the reaction solution was transferred to a 500 ml separatory funnel. After washing with saturated saline, it was washed with saturated sodium bicarbonate water, then washed twice with saturated saline, and finally washed twice with pure water. After washing with water, dehydration was performed with magnesium sulfate (Wako Pure Chemical Industries, Ltd.). The liquid was moved to a separable flask, the solvent was distilled off, and heated under reduced press...

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Abstract

The present invention relates to: a negative active material for secondary batteries which comprises a silicon oxide-based composite material, attains a high battery capacity, and has excellent charge / discharge cycling characteristics; a process for producing the negative active material; and a negative electrode and a lithium-ion battery both obtained using the negative active material. The silicon oxide-based composite material has a new structure and is directly obtained by burning, in an inert gas atmosphere, a polysilsesquioxane having a specific structure. The yielded silicon oxide-based composite material has graphitic carbon and is represented by the general formula SiOxCy (0.5<x<1.8, 1<y<5). In an examination by the X-ray small-angle scattering method, the composite material gives a spectrum which shows scattering in the range of 0.02 Å-1<q<0.2 Å-1. In an examination by Raman spectroscopy, the composite material gives a spectrum which shows scattering at 1,590 cm-1 (G band; graphite structure) and at 1,325 cm-1 (D band; amorphous carbon), the peak intensity ratio of crystalline carbon and amorphous carbon (ID / IG ratio) being in the range of 2.0-5.0. The silicon oxide-based composite material is used as a negative active material to form a negative electrode therefrom, and the negative electrode is used to form a lithium-ion secondary battery.

Description

technical field [0001] The present invention relates to a negative electrode active material for a secondary battery exhibiting high capacity, excellent charge-discharge characteristics, and cycle characteristics when used as a negative electrode active material for a lithium ion secondary battery, a method for producing the same, a negative electrode using the same, and lithium ion battery. [0002] More specifically, it relates to a negative electrode active material containing a silicon oxide-based composite material, a method for producing the same, a negative electrode using the same, and a negative electrode and a lithium ion battery containing the negative electrode active material to improve battery capacity and life characteristics. The composite material is obtained by heat-treating polysilsesquioxane in an inert gas environment, and contains Si, C, and O through elemental analysis. In the spectrum measured by X-ray small-angle scattering method, in Scattering is s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/134H01M4/36H01M4/587
CPCH01M4/58H01M10/052H01M4/483H01M4/364H01M4/366H01M4/625H01M10/0525Y02E60/10H01M4/133H01M4/134H01M4/362H01M4/485H01M4/587H01M4/583
Inventor 大野胜彦岩谷敬三木崎哲朗金尾启一郎近藤正一
Owner JNC CORP
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