Non-aqueous electrolyte secondary battery and fabrication method for non-aqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, applied in non-aqueous electrolyte battery electrodes, non-aqueous electrolyte batteries, electrolyte battery manufacturing and other directions, can solve the problems of inability to suppress micronization, reduction in current collection, volume expansion and contraction, etc.

Inactive Publication Date: 2011-09-28
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These materials show a high specific capacity per unit mass, as high as 4198mAh / g for Si and 993mAh / g for Sn. On the other hand, they have the following problems: compared with graphite negative electrodes, the operating potential during discharge is higher, and when charging and discharging Volume expansion and contraction occur, and as a result, cycle characteristics tend to decrease
[0015] However, it is difficult to manufacture nano-metal particles with a very small average particle size as described above, and in the case of nano-metal particles formed of metal elements such as Si whose operating potential is different from that of graphite during discharge, there is a possibility that proper charge and discharge cannot be performed. question
Even fine particles cannot suppress further micronization, and there are problems such as swelling of the electrode plate, decrease in current collection performance, and decrease in cycle characteristics.

Method used

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  • Non-aqueous electrolyte secondary battery and fabrication method for non-aqueous electrolyte secondary battery
  • Non-aqueous electrolyte secondary battery and fabrication method for non-aqueous electrolyte secondary battery
  • Non-aqueous electrolyte secondary battery and fabrication method for non-aqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] In Example 1, as the negative electrode active material, the first active material used was produced by the atomization method, with an average particle diameter of 4.5 μm and spherical zinc (Kishida Chemical Co., Ltd., special grade, product number 000- 87575, refer to figure 1 ), the second active material uses artificial graphite with an average particle diameter of 22 μm and a lattice constant of 0.3362 nm. In addition, the average particle diameter of zinc and artificial graphite was measured with SALAD-2000 by Shimadzu Corporation.

[0094] Then, the above-mentioned first active material and second active material were mixed by a ball mill at a mass ratio of 5:95. In addition, when mixing with a ball mill, 10 SUS balls with a diameter of 12.5 mm and 8.5 g were used, and the operation was repeated 60 times by mixing at 200 rpm for 30 seconds and then stopping for 30 seconds as one operation.

[0095] Then, add binder polyvinylidene fluoride and dispersion medium...

Embodiment 2

[0101] In Example 2, in the preparation of the negative electrode active material of the above-mentioned Example 1, only the mass ratio of the above-mentioned first active material composed of zinc and the above-mentioned second active material composed of artificial graphite is changed to 10:90, Make the negative electrode. Furthermore, a test battery of Example 2 was fabricated in the same manner as in Example 1 except for using the negative electrode.

Embodiment 3

[0103] In Example 3, in the preparation of the negative electrode active material of the above-mentioned Example 1, only the mass ratio of the above-mentioned first active material composed of zinc and the above-mentioned second active material composed of artificial graphite is changed to 30:70, Make the negative electrode. Furthermore, a test battery of Example 3 was fabricated in the same manner as in Example 1 except for using this negative electrode.

[0104] In addition, the surface of the negative electrode produced in Example 3 was observed by a scanning electron microscope (SEM), and the surface of the negative electrode was enlarged to 1000 times. The SEM image is as follows: image 3 As shown, the SEM image of the surface of the negative electrode magnified to 5000 times is as follows Figure 4 shown. As a result, such as image 3 As shown, the first active material composed of zinc exists in the state of being dispersed in the second active material composed of ...

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Abstract

A non-aqueous electrolyte secondary battery according to the present invention has a positive electrode comprising a positive electrode active material, a negative electrode comprising a negative electrode active material and a non-aqueous electrolyte, wherein a mixture of at least one metal selected from zinc and cadmium having an average particle diameter in a range of from 0.25 [mu]m to 100 [mu]m and carbon is used as the negative electrode active material.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery comprising a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material, and a nonaqueous electrolyte, and a method for manufacturing the nonaqueous electrolyte secondary battery. In particular, the present invention is characterized in that the negative electrode active material used in the negative electrode is improved, and a nonaqueous electrolyte secondary battery having high capacity, high energy density and excellent charge-discharge cycle characteristics can be obtained. Background technique [0002] In recent years, nonaqueous electrolyte secondary batteries in which lithium ions are charged and discharged by moving lithium ions between a positive electrode and a negative electrode have been used as power sources for portable electronic devices. [0003] In addition, recently, the miniaturiza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M10/052H01M4/139H01M10/058
CPCY02E60/122H01M4/587H01M10/0525H01M4/42H01M4/38H01M4/364Y10T29/49108Y10T29/49115Y02E60/10Y02P70/50H01M4/583H01M4/04H01M4/62
Inventor 高桥康文藤本正久
Owner SANYO ELECTRIC CO LTD
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