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Negative electrode active material, method for producing the negative electrode active material, and lithium ion secondary battery using the negative electrode active material

A technology of negative electrode active material and manufacturing method, applied in secondary batteries, lithium storage batteries, non-aqueous electrolyte storage batteries, etc., can solve problems such as high discharge capacity, and achieve the effect of high discharge capacity and increased discharge capacity

Inactive Publication Date: 2012-07-11
NIPPON CHIMI CON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a negative electrode active material having a higher discharge capacity than the conventional negative electrode active material made of graphite and exhibiting a high capacity retention rate up to at least 200 cycles has not been confirmed until now.

Method used

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  • Negative electrode active material, method for producing the negative electrode active material, and lithium ion secondary battery using the negative electrode active material
  • Negative electrode active material, method for producing the negative electrode active material, and lithium ion secondary battery using the negative electrode active material
  • Negative electrode active material, method for producing the negative electrode active material, and lithium ion secondary battery using the negative electrode active material

Examples

Experimental program
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Effect test

Embodiment 1

[0094] To (Japanese) Unexamined Patent Publication No. 2007-160151 figure 1 Into the inner cylinder of the reactor shown in , which is composed of an outer cylinder and an inner cylinder, a through hole is provided on the side of the inner cylinder, and a weir plate is arranged at the opening of the outer cylinder, and 1.9 g of SnCl 2 2H 2 O was dissolved in 30 ml of water and 1.3 g of Ketjen Black (trade name Ketjen Black EC600J, manufactured by Ketjen Black International Co., Ltd., primary particle size 34 nm, pore size 4 nm) to apply 70000 kgms to the reaction solution. -2The centrifugal force makes the inner cylinder rotate for 300 seconds, so that the SnCl 2 2H 2 O and Ketjen Black are dispersed. Once the inner cylinder stops rotating, add 16.8ml of 1M NaOH aqueous solution to the inner cylinder, and then apply 70000kgms to the reaction solution -2 The centrifugal force makes the inner cylinder rotate for 120 seconds. During this period, a film is formed on the inner...

Embodiment 2

[0097] The procedure of Example 1 was repeated except that 0.54 g of KB (trade name Ketjen Black EC600J, manufactured by Ketjen Black International Co., Ltd., primary particle diameter 34 nm, pore diameter 4 nm) was used.

[0098] In KB carrying the obtained tin oxide particles, it was confirmed that tin dioxide was produced. In addition, the composition ratio of tin dioxide and KB is SnO in terms of mass ratio 2 : KB=64: 36, the feed amount (SnO 2 :KB=70:30) are roughly the same value. Furthermore, it was confirmed from the TEM photograph that the particle size of the tin dioxide particles was 1 to 2 nm, and that 95% by mass of the primary particles existed in a non-aggregated state.

Embodiment 3

[0100] The procedure of Example 1 was repeated except that 0.33 g of KB (trade name Ketjen Black EC600J, manufactured by Ketjen Black International, primary particle diameter 34 nm, pore diameter 4 nm) was used.

[0101] In KB carrying the obtained tin oxide particles, it was confirmed that tin dioxide was produced. In addition, the composition ratio of tin dioxide and KB, in terms of mass ratio, is SnO 2 : KB=75: 25, the feed amount (SnO 2 :KB=80:20) are roughly the same value. Furthermore, it was confirmed from the TEM photograph that the particle size of the tin dioxide particles was 1 to 2 nm, and that 85% by mass of the primary particles existed in a non-aggregated state.

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Abstract

Disclosed is a negative electrode active material which has a high capacity and good cycle properties. The negative electrode active material comprises nanosized carbon particles and nanosized tin dioxide particles that are carried on the nanosized carbon particles in a high-dispersion state. This negative electrode active material has a high discharge capacity because of the reversible progress of a conversion reaction of tin dioxide (SnO2+4Li++4e-?2Li2O+Sn) therein. In a charge-discharge cycle test within a voltage range of 0-2 V vs. an Li / Li+ electrode, the aforesaid negative electrode active material shows a discharge capacity retention ratio of about 90% even after repeating the charge-discharge cycles 500 times under rate 1C conditions, which indicates very good cycle properties. Thus, the aforesaid negative electrode active material can be appropriately used in a lithium ion secondary battery and a hybrid capacitor.

Description

technical field [0001] The invention relates to a negative electrode active material with excellent cycle characteristics and a manufacturing method thereof. The invention also relates to a lithium ion secondary battery using the negative electrode active material. Background technique [0002] Lithium-ion secondary batteries using non-aqueous electrolyte solutions with high energy density are widely used as power sources for information equipment such as mobile phones and notebook computers. With the increase in power consumption, it is desired that the discharge capacity of the lithium ion secondary battery be high. In addition, from the viewpoints of reduction in petroleum consumption, mitigation of air pollution, and reduction of carbon dioxide emissions that cause global warming, there are expectations for low-pollution vehicles such as electric vehicles and hybrid vehicles that can replace gasoline vehicles or diesel vehicles. It is increasingly desired to develop a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01G9/058H01M4/36H01M10/052H01M10/0566B82Y30/00B82Y40/00B82Y99/00C01G19/02H01G9/00H01G11/22H01G11/24H01G11/46H01G11/86
CPCY02E60/12H01M4/587H01M4/625H01M4/483H01M10/0525Y02T10/7011Y02E60/13H01G11/24H01G11/32Y02E60/122H01G11/50H01G11/86H01G11/46H01M4/364Y02T10/7022H01G9/058H01G11/42Y02E60/10Y02T10/70C01G19/02H01M4/139
Inventor 直井胜彦直井和子石本修一玉光贤次
Owner NIPPON CHIMI CON CORP
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