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Titanic acid compound, process for producing the titanic acid compound, electrode active material containing the titanic acid compound, and storage device using the electrode active material

A technology of titanate compounds and organic compounds, applied in titanium compounds, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of low discharge potential of graphite, safety concerns, etc., and achieve high capacity and excellent cycle characteristics , The effect of excellent battery characteristics

Inactive Publication Date: 2010-09-22
ISHIHARA SANGYO KAISHA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although graphite, which can provide a stable potential, has been used as the negative electrode, since graphite has a low discharge potential, there are concerns about its safety when used in large-sized batteries such as those used in hybrid electric vehicles (HEV applications), and the discharge potential is 1.5V. Titanate compounds draw attention

Method used

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  • Titanic acid compound, process for producing the titanic acid compound, electrode active material containing the titanic acid compound, and storage device using the electrode active material
  • Titanic acid compound, process for producing the titanic acid compound, electrode active material containing the titanic acid compound, and storage device using the electrode active material
  • Titanic acid compound, process for producing the titanic acid compound, electrode active material containing the titanic acid compound, and storage device using the electrode active material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 20.0 grams of commercially available rutile-type high-purity titanium dioxide (PT-301, manufactured by Ishihara Sangyo Kaisha Ltd.) and 8.85 grams of sodium carbonate were uniformly mixed. The mixture was heated and calcined in the air at a temperature of 800° C. for 20 hours using an electric furnace. After heating and calcining, the resultant is cooled, thoroughly mixed, and then heated and calcined under the same conditions to obtain Na 2 Ti 3 O 7 . The resulting Na 2 Ti 3 O 7 Add to the concentration of 1 molar hydrochloric acid aqueous solution to make Na 2 Ti 3 O 7 The concentration becomes 10 g / L, and it is allowed to react at room temperature for 4 days under stirring to obtain H 2 Ti 3 O 7 . Here, during these 4 days, the solid content was allowed to settle and the aqueous hydrochloric acid solution was replaced every day. Filtered H 2 Ti 3 O 7 , Washed, and dried in air at 60°C for 12 hours, and then thermally dehydrated in air at 260°C for 20 hours using an e...

Embodiment 2 to 4

[0043] The titanic acid compound of the present invention (Examples 2 and 3: Samples B and C) was obtained as in Example 1, except that the heating temperature in Example 1 was changed to 300°C or 320°C.

[0044] The titanic acid compound of the present invention (Example 4: Sample D) was obtained as in Example 1, except that the heating temperature was set to 290°C and the heating time was set to 5 hours.

[0045] Their heat loss in the temperature range of 300 to 600°C is 0.8% by weight, 0.7% by weight and 1.8% by weight, respectively.

Embodiment 5

[0047] Using a spray dryer (model: MDL-050C, manufactured by Fujisaki Electric Co., Ltd.), at an inlet temperature of 200°C and an outlet temperature of 70 to 90°C, the TiO 2 A total of 282.0 grams of orthotitanic acid and 5,638 grams of an aqueous slurry of 124.7 grams of sodium carbonate were spray dried to obtain a dry granulated material. The resulting dried granulated material was heated and calcined in the air at a temperature of 800° C. for 20 hours using an electric furnace. After heating and calcining, the resultant is cooled, thoroughly mixed, and then heated and calcined under the same conditions to obtain Na 2 Ti 3 O 7 Of granulated materials. The resulting Na 2 Ti 3 O 7 The granulated material is added to the 1 molar hydrochloric acid aqueous solution to make Na 2 Ti 3 O 7 The concentration becomes 10 g / L, and it is allowed to react under stirring for 4 days at room temperature to obtain H 2 Ti 3 O 7 Of granulated materials. Here, during these 4 days, the solid con...

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Abstract

This invention provides a titanic acid compound-type electrode active material having a high battery capacity and, at the same time, having excellent cycle characteristics. The titanic acid compound exhibits an X-ray diffraction pattern corresponding to a bronze-type titanium dioxide except for a peak for a (200) plane and having a peak intensity ratio between the (001) plane and the (200) plane,i.e., I(200) / I(001), of not more than 0.2. The titanic acid compound may be produced by heat dehydrating H2Ti3O7 at a temperature in the range of 200 to 330 DEG C, by heat dehydrating H2Ti4O9 at a temperature in the range of 250 to 650 DEG C, or by heat dehydrating H2Ti5O11at a temperature in the range of 200 to 600 DEG C.

Description

Technical field [0001] The present invention relates to a titanic acid compound having a specified crystal structure, a method of manufacturing the titanic acid compound, an electrode active material using the titanic acid compound, and an electric storage device using the electrode active material. Background technique [0002] Compounds containing at least titanium and oxygen are known to include, for example, titanic acid compounds and titanium oxide. Titanic acid is known to include the composition formula H 4 TiO 4 Orthotitanic acid and H shown 2 TiO 3 The metatitanic acid shown (Non-Patent Document 1). Titanium oxide is known to include titanium dioxide having a rutile type, anatase type, or brookite type crystal structure, and a crystal structure called a bronze type has also recently been reported (Non-Patent Document 2). [0003] On the other hand, since lithium secondary batteries have high energy density and excellent cycle characteristics, they have recently spread rap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48C01G23/00
CPCC01P2006/12C01P2006/14Y02E60/122C01P2002/72C01P2002/74H01M10/052C09C1/36H01M4/48C01G23/005H01M4/364C01P2004/62H01M4/485C01P2004/61C01G23/04Y02E60/10
Inventor 外川公志森山齐昭本间昌利吹田德雄
Owner ISHIHARA SANGYO KAISHA LTD
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