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Title:
LITHIUM SULFIDE-CARBON COMPLEX, PROCESS FOR PRODUCING THE COMPLEX, AND LITHIUM ION SECONDARY BATTERY UTILIZING THE COMPLEX
Document Type and Number:
WIPO Patent Application WO/2010/035602
Kind Code:
A1
Abstract:
Disclosed is a process for producing a lithium sulfide-carbon complex.  The process is characterized by comprising filling a mixture of lithium sulfide and a carbon material having a specific surface area of 60 m2/g or more in an electrically conductive mold, and applying a pulsed direct current to the mixture in a low-moisture-content non-oxidative atmosphere while pressurizing the mixture, thereby reacting lithium sulfide with the carbon material under heated conditions.  Also disclosed is a lithium sulfide-carbon complex comprising lithium sulfide and a carbon material, which is produced by the above-mentioned process.  The complex is characterized by having a carbon content of 15 to 70 mass%, a tap density of 0.4 g/cm3 or more when the carbon content is 30 mass% or more, and a tap density of 0.5 g/cm3 or more when the carbon content is less than 30 mass%. With respect to lithium sulfate that is expected to be put into practical use as a high-capacity positive electrode active material, it becomes possible to further improve electron conductivity and properties required for use as a positive electrode active material for a lithium ion secondary battery.

Inventors:
TAKEUCHI, Tomonari (8-31 Midorigaoka 1-chome, Ikeda-sh, Osaka 77, 〒5638577, JP)
竹内 友成 (〒77 大阪府池田市緑丘1丁目8番31号 独立行政法人産業技術総合研究所 関西センター内 Osaka, 〒5638577, JP)
SAKAEBE, Hikari (8-31 Midorigaoka 1-chome, Ikeda-sh, Osaka 77, 〒5638577, JP)
栄部 比夏里 (〒77 大阪府池田市緑丘1丁目8番31号 独立行政法人産業技術総合研究所 関西センター内 Osaka, 〒5638577, JP)
SAKAI, Tetsuo (8-31 Midorigaoka 1-chome, Ikeda-sh, Osaka 77, 〒5638577, JP)
境 哲男 (〒77 大阪府池田市緑丘1丁目8番31号 独立行政法人産業技術総合研究所 関西センター内 Osaka, 〒5638577, JP)
TATSUMI, Kuniaki (8-31 Midorigaoka 1-chome, Ikeda-sh, Osaka 77, 〒5638577, JP)
Application Number:
JP2009/064721
Publication Date:
April 01, 2010
Filing Date:
August 24, 2009
Export Citation:
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Assignee:
NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY (3-1 Kasumigaseki 1-chome, Chiyoda-ku Tokyo, 21, 〒1008921, JP)
独立行政法人産業技術総合研究所 (〒21 東京都千代田区霞が関一丁目3番1号 Tokyo, 〒1008921, JP)
TAKEUCHI, Tomonari (8-31 Midorigaoka 1-chome, Ikeda-sh, Osaka 77, 〒5638577, JP)
竹内 友成 (〒77 大阪府池田市緑丘1丁目8番31号 独立行政法人産業技術総合研究所 関西センター内 Osaka, 〒5638577, JP)
SAKAEBE, Hikari (8-31 Midorigaoka 1-chome, Ikeda-sh, Osaka 77, 〒5638577, JP)
栄部 比夏里 (〒77 大阪府池田市緑丘1丁目8番31号 独立行政法人産業技術総合研究所 関西センター内 Osaka, 〒5638577, JP)
SAKAI, Tetsuo (8-31 Midorigaoka 1-chome, Ikeda-sh, Osaka 77, 〒5638577, JP)
境 哲男 (〒77 大阪府池田市緑丘1丁目8番31号 独立行政法人産業技術総合研究所 関西センター内 Osaka, 〒5638577, JP)
International Classes:
H01M4/58; C01B17/22; H01M4/36; H01M4/62
Foreign References:
JP2006164779A2006-06-22
JP2005011696A2005-01-13
JP2009064667A2009-03-26
JP2005259629A2005-09-22
JP2008257962A2008-10-23
JP2009009905A2009-01-15
Attorney, Agent or Firm:
Saegusa & Partners (Kitahama TNK Building, 1-7-1 Doshomachi, Chuo-ku, Osaka-sh, Osaka 45, 〒5410045, JP)
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