Active material for negative electrodes of nonaqueous secondary batteries, and nonaqueous secondary battery

Inactive Publication Date: 2015-11-26
DAINIPPON INK & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an excellent material for negative electrodes of nonaqueous secondary batteries that can be easily manufactured. This material performs well and allows for the creation of high-quality negative electrodes and batteries. Overall, the invention simplifies the process of producing efficient nonaqueous secondary batteries.

Problems solved by technology

Among various secondary batteries, although a lithium ion battery which can ensure a capacity even by its small size has most drawn attention, problems, such as a short travel distance of automobiles and a short use time of smart phones, may arise, and hence further development of increase in energy density has been pursued.
However, the volume expansion of the material as described above is large during charge and discharge, and when the material is used as an electrode, for example, peeling of the electrode, collapse thereof, and breakage of an electrically conductive path may occur in some cases.
As a result, for example, a life that can satisfy a practical use may not be disadvantageously obtained.
However, in a mechanically mixing method and a reduction deposition method (plating method), since metal particles are liable to physically adhere to a surface of a carbon mother material, an interface adhesion force is relatively low, and the particles are disadvantageously liable to be peeled away from the surface of the mother material.
Free particles thus peeled away may be fused together or grown during charge and discharge, so that the battery performance may be degraded in some cases.
In a method for forming a nano sheet laminate, the operation is complicated, and the efficiency is also low; hence, this method may not be advantageously applied to an industrial mass production and the like.

Method used

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  • Active material for negative electrodes of nonaqueous secondary batteries, and nonaqueous secondary battery
  • Active material for negative electrodes of nonaqueous secondary batteries, and nonaqueous secondary battery
  • Active material for negative electrodes of nonaqueous secondary batteries, and nonaqueous secondary battery

Examples

Experimental program
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Effect test

synthesis example 1

Preparation Example of Composite Resin (A)

[0116]Into a reaction container equipped with a stirrer, a thermometer, a dripping funnel, a cooling tube, and a nitrogen gas inlet, 191 g of phenyltrimethoxysilane (PTMS) was charged, and the temperature was increased to 120° C. Next, a mixture of 169 g of methyl methacrylate (MMA), 11 g of 3-methacryloyloxy propyltrimethoxysilane (MPTS), and 18 g of tert-butyl peroxy-2-ethylhexanoate (TBPEH) was dripped to the reaction container described above over 4 hours. Subsequently, stirring was performed for 16 hours at the same temperature as described above, so that a vinyl polymer (a2-1-1) having a trimethoxysilyl group was prepared.

[0117]Next, the temperature of the above reaction container was controlled at 80° C., 131 g of methyltrimethoxysilane (MTMS), 226 g of 3-acryloyloxy propyltrimethoxysilane (APTS), and 116 g of dimethyldimethoxysilane (DMDMS) were added to the above reaction container.

[0118]Subsequently, a mixture of 6.3 g of “A-3” [ma...

synthesis example 2

[0119]Into a reaction container similar to that in Synthesis Example 1-1, 250 g of PTMS was charged, and the temperature was increased to 120° C. Next, a mixture of 169 g of MMA, 11 g of MPTS, and 18 g of TBPEH was dripped to the reaction container described above over 4 hours. Subsequently, stirring was performed for 16 hours at the same temperature as described above, so that a vinyl polymer (a2-1-2) having a trimethoxysilyl group was prepared.

[0120]Next, the temperature of the above reaction container was controlled at 80° C., 172 g of MTMS, 113 g of APTS, and 151 g of DMDMS were added to the above reaction container. Subsequently, a mixture of 6.9 g of “A-3” and 105 g of deionized water was dripped for 5 minutes, and stirring was performed for 2 hours at the same temperature as described above to perform a hydrolysis condensation reaction, so that a reaction product was obtained. By the analysis of the reaction product using 1H-NMR, it was found that approximately 100% of the tr...

synthesis example 3

[0121]Into a reaction container similar to that in Synthesis Example 1-1, 164 g of PTMS was charged, and the temperature was increased to 120° C. Next, a mixture of 226 g of MMA, 14 g of MPTS, and 24 g of TBPEH was dripped to the reaction container described above over 4 hours. Subsequently, stirring was performed for 16 hours at the same temperature as described above, so that a vinyl polymer (a2-1-3) having a trimethoxysilyl group was prepared.

[0122]Next, the temperature of the above reaction container was controlled at 80° C., 113 g of MTMS, 194 g of APTS, and 99 g of DMDMS were added to the above reaction container.

[0123]Subsequently, a mixture of 5.4 g of “A-3” and 83 g of deionized water was dripped for 5 minutes, and stirring was performed for 2 hours at the same temperature as described above to perform a hydrolysis condensation reaction, so that a reaction product was obtained. By the analysis of the reaction product using 1H-NMR, it was found that approximately 100% of the...

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Abstract

An active material having a high capacity for negative electrodes of nonaqueous secondary batteries is provided by pyrolysis of a composite resin (A) which has a silanol group and / or a hydrolysable silyl group and which contains a polysiloxane segment (a1) and a polymer segment (a2) other than the polysiloxane segment (a1), and furthermore, a negative electrode using the above active material and a nonaqueous secondary battery including the above negative electrode are also provided. In addition, by pyrolysis of a dispersion liquid obtained from the composite resin (A), silicon particles, and an organic solvent, an active material having a high capacity for negative electrodes of nonaqueous secondary batteries is provided, and furthermore, a negative electrode using the above active material and a nonaqueous secondary battery including the above negative electrode are also provided.

Description

TECHNICAL FIELD[0001]The present invention relates to an active material for negative electrodes of nonaqueous secondary batteries which is obtained by pyrolysis of a specific resin and to a nonaqueous secondary battery.BACKGROUND ART[0002]As the present global movement, in consideration of the backgrounds of the Great East Japan Earthquake, social environmental issues, and the like, the way of energy utilization is now to be significantly changed. Concrete movements, such as the promotion of smart grid, and the start of a full amount purchase system of electricity, have occurred, and secondary batteries have been regarded as the most important key device in those movements.[0003]Among various secondary batteries, although a lithium ion battery which can ensure a capacity even by its small size has most drawn attention, problems, such as a short travel distance of automobiles and a short use time of smart phones, may arise, and hence further development of increase in energy density...

Claims

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Application Information

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IPC IPC(8): H01M4/60H01M10/0525H01M4/1393H01M4/1395H01M4/1399H01M4/587H01M10/0566
CPCH01M4/604H01M2220/30H01M10/0525H01M4/364H01M4/386H01M4/602H01M4/587H01M4/625Y02E60/10H01B1/04
InventorMIKI, TAKAYUKITAKADA, YASUHIRONONAKA, SHINICHIOOKUMA, MASAMIKAMEI, KIYOONISHIYAMA, TOSHINORI
OwnerDAINIPPON INK & CHEM INC