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Anode active material and battery

A negative electrode active material, battery technology, applied in the direction of active material electrodes, negative electrodes, battery electrodes, etc., to achieve the effect of improving cycle characteristics, high capacity, and superior cycle characteristics

Inactive Publication Date: 2006-07-05
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has therefore been demanded to suppress such crystallization to further improve cycle characteristics

Method used

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  • Anode active material and battery
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  • Anode active material and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1 to 1-8

[0124] First, a negative electrode active material is formed. As raw materials, cobalt powder, tin powder, carbon powder, titanium powder, molybdenum powder, niobium powder, aluminum powder, germanium powder, phosphorus powder, bismuth powder, and indium powder were prepared. Next, in Example 1-1, cobalt powder, tin powder, and titanium powder were alloyed to form cobalt-tin-titanium alloy powder, and carbon powder was added thereto and dry-blended. In embodiment 1-2 to embodiment 1-6 and embodiment 1-8, cobalt powder and tin powder are alloyed to form cobalt-tin alloy powder, and carbon powder and molybdenum powder, niobium powder, aluminum powder, germanium powder , aluminum powder and phosphorus powder, or indium powder are added and dry mixed. In Examples 1-7, cobalt powder, tin powder and bismuth powder were alloyed to form cobalt-tin-bismuth alloy powder, and carbon powder was added thereto and dry-blended. The ratio of raw materials is shown in Table 1. Next, 20 g of...

Embodiment 2-1 and 2-2

[0145] The negative electrode active material and the secondary battery were formed as in Example 1-1, except that the synthesis conditions of the negative electrode active material were changed. The total rotation speed and run time were 300 rpm and 30 hours in Example 2-1, and 250 rpm and 25 hours in Example 2-2, respectively.

[0146] As comparative examples 2-1 to 2-4 with respect to Examples 2-1 and 2-2, negative electrode active materials and secondary batteries were formed as in Examples 2-1 and 2-2, except that the synthesis conditions of the negative electrode active materials were changed outside. The total rotation speed and running time were 150 rpm and 30 hours in Comparative Example 2-1, 200 rpm and 30 hours in Comparative Example 2-2, 250 rpm and 15 hours in Comparative Example 2-3, and 250 rpm and 20 hours in Comparative Examples 2-4, respectively.

[0147] For the negative electrode active material, XPS was performed, and the resulting peaks were analyzed. ...

Embodiment 3-1 and 3-2

[0151] A secondary battery was fabricated as in Example 1-1, except that the negative electrode active material was synthesized by changing the raw material ratios of cobalt, tin, carbon, and titanium as shown in Table 5. Specifically, the ratio of Co / (Sn+Co) was set at a constant value of 37% by weight, the raw material ratio of titanium was set at a constant value, and the raw material ratio of carbon was set at 10% by weight or 30% by weight.

[0152] Raw material ratio (weight%)

Analysis value (weight%)

discharge

capacity

(mAh /

cm 3 )

300th time

Loop content

Volume retention

(%)

co

sn

C

Ti

co

sn

C

Ti

Example 3-1

31.8

54.2

10.0

4.0

30.5

53.6

9.9

4.0

143

81

Example 1-1

28.1

47.9

20.0

4.0

27.8

47.7

19.8

4.0

...

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PUM

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Abstract

A battery with a high capacity and superior cycle characteristics and an anode active material used for it are provided. An anode contains an anode active material capable of reacting with lithium. The anode active material contains tin, cobalt, and carbon, and further contains at least one from the group consisting of indium, niobium, germanium, titanium, molybdenum, aluminum, phosphorus, and bismuth. Further, in the anode active material, the carbon content is from 9.9 wt % to 29.7 wt %, and the ratio of cobalt to the total of tin and cobalt is from 30 wt % to 70 wt %. Further, coordination number of cobalt as a first neighboring atom around tin obtained by the radial structure function calculated based on one scattering theory of X-ray absorption spectroscopy is 4 or less.

Description

[0001] Cross References to Related Applications [0002] The present invention contains subject matter related to Japanese Patent Application JP2004-325754 filed in the Japan Patent Office on Nov. 9, 2004, the entire content of which is hereby incorporated by reference. technical field [0003] The present invention relates to a negative electrode active material including tin (Sn), cobalt (Co) and carbon (C), and a battery using the negative electrode active material. Background technique [0004] In recent years, many portable electronic devices such as combination cameras (video tape recorders), mobile phones and notebook personal computers have been introduced, and miniaturization and weight reduction of such devices have been carried out. Research and development for improving the energy density of batteries used as portable power sources of such electronic devices, especially secondary batteries as key devices, has been actively promoted. Specifically, nonaqueous elec...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M10/40H01M4/02H01M4/58H01M10/052
CPCY02E60/122H01M2004/027H01M4/364H01M2004/021H01M4/38H01M4/583Y02E60/12H01M4/463H01M10/052H01M4/405H01M4/387Y02E60/10H01M4/02
Inventor 水谷聪工藤喜弘
Owner SONY CORP
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