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Anode active substance and battery

A negative electrode active material and battery technology, applied in the direction of active material electrodes, negative electrodes, dry batteries, etc., can solve the problems of large lag in the shape of charge and discharge curves, no significant improvement can be expected, and low battery discharge voltage to achieve improved cycle characteristics, excellent cycle characteristics, and the effect of reducing reactivity

Inactive Publication Date: 2007-11-21
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of using such a carbon material, the negative electrode discharge voltage against lithium (Li) is 0.8V-1.0V, and the battery discharge voltage becomes low when forming a battery, so a significant improvement cannot be expected in consideration of the battery energy density. improve
In addition, there are disadvantages such as large hysteresis in the shape of the charge and discharge curve, and low energy efficiency per cycle of charge and discharge
[0008] However, this has a big disadvantage: Li-Al alloy, Sn alloy, or Si alloy expands and contracts by charging and discharging, and the negative electrode is pulverized every time charging and discharging, so the cycle characteristics are very poor

Method used

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  • Anode active substance and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1 to 1-10

[0104] First, a negative electrode active material is formed. As raw materials, tin powder, iron powder and carbon powder were prepared. Tin powder and iron powder are alloyed to form a tin-iron alloy powder, and carbon powder is then added to the powder and dry blended. Regarding the raw material ratio, the ratio of iron to the total amount of tin and iron (hereinafter referred to as the Fe / (Sn+Fe) ratio) is constantly maintained at 32% by weight, and the raw material ratio of carbon is 12% by weight to 30% by weight. range changes. Subsequently, 20 g of this mixture and about 400 g of corundum having a diameter of 9 mm were placed in a reactor of a planetary ball mill of Ito Seisakusho Co., Ltd. Next, the atmosphere inside the reactor was replaced with an argon atmosphere. Then, the 10 minute run at 250 rpm and the 10 minute rest were repeated until the total run time reached 30 hours. After that, the reactor was cooled to room temperature, and the synthesized negative a...

Embodiment 2-1 to 2-8

[0119] Negative electrode active materials and secondary batteries were fabricated in the same manner as in Examples 1-1 to 1-10, except that the ratio of raw materials among tin, iron, and carbon was changed as shown in Table 2. Specifically, the raw material ratio of carbon was kept constant at 30.0% by weight, and the Fe / (Sn+Fe) ratio was varied within a range of 26% by weight to 48% by weight.

[0120] Raw material ratio (weight%)

Analysis value (weight%)

initial charge

capacitance

(mAh / g)

capacity

Keep

Rate(%)

Fe

sn

C

Fe

sn

C

Fe / (Sn

+Fe)

Example 2-1

18.2

51.8

30.0

18.4

51.4

29.7

26.4

596.7

53

Example 2-2

20.3

49.7

30.0

20.6

49.4

29.7

29.4

605.3

60

Examples 1-10

22.4

47.6

30.0

22.6

47.3

29.7

32.3

5...

Embodiment 3-1 to 3-8

[0126] Anode active materials and secondary batteries were formed in the same manner as in Examples 1-1 to 1-10, except that the raw material ratios among tin, iron, and carbon were changed as shown in Table 3. Specifically, the raw material ratio of carbon was kept constant at 20.0% by weight, and the Fe / (Sn+Fe) ratio was varied within a range of 26% by weight to 48% by weight.

[0127] Raw material ratio (weight%)

Analysis value (weight%)

initial charge

capacitance

(mAh / g)

capacity

Keep

Rate(%)

Fe

sn

C

Fe

sn

C

Fe / (Sn

+Fe)

Example 3-1

20.8

59.2

20.0

21.1

58.8

19.8

26.4

642.3

76

Example 3-2

23.2

56.8

20.0

23.5

56.4

19.8

29.4

651.6

82

Example 1-5

25.6

54.4

20.0

25.8

54.0

19.8

32.3

644.2

85

...

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Abstract

An anode active material with a high capacity capable of providing superior cycle characteristics and a battery using it are provided. An anode contains an anode active material capable of reacting with lithium. The anode active material contains at least tin, iron, and carbon as an element. The carbon content is from 11.9 wt % to 29.7 wt %, and the iron ratio to the total of tin and iron is from 26.4 wt % to 48.5 wt %. Thereby, while a high capacity is maintained, the cycle characteristics are improved.

Description

[0001] Cross References to Related Applications [0002] The present invention comprises Japanese patent application JP2005-147074 submitted to Japan Patent Office on May 19, 2005, Japanese patent application JP2005-295359 submitted to Japan Patent Office on October 7, 2005 and submitted to Japan Patent Office on January 23, 2006 Japanese Patent Application JP2006-13911 related subject matter, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a negative electrode active material containing tin (Sn), iron (Fe) and carbon (C) as constituent elements 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 these devices have been carried out. Research and deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M10/40B22F1/00C22C13/00C22C45/00H01M4/02H01M4/134H01M4/58H01M10/05H01M10/052H01M10/0567H01M10/0569
CPCH01M2004/027H01M10/0525H01M2300/0085C22C13/00H01M4/134H01M10/0569H01M10/0567Y02E60/122H01M6/10H01M4/38H01M4/386H01M4/387Y02E60/10H01M4/36H01M10/0587H01M10/05
Inventor 石原英贵堀内博志
Owner SONY CORP
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