Title:
POSITIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, METHOD FOR PRODUCING SAME, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY
Document Type and Number:
WIPO Patent Application WO/2012/011212
Kind Code:
A1
Abstract:
Provided are: a positive electrode active material for a nonaqueous secondary battery, which has high capacity, high stability and excellent output characteristics; a method for producing the positive electrode active material for a nonaqueous secondary battery; and a nonaqueous electrolyte secondary battery which uses the positive electrode active material.
The positive electrode active material, which is applied to a nonaqueous electrolyte secondary battery, is configured of a hexagonal lithium-containing complex oxide that is represented by LitNi1-x-y-zCoxAlyTizO2 (wherein 0.98 ≤ t ≤ 1.10, 0 < x ≤ 0.30, 0.03 ≤ y ≤ 0.15, 0.001 ≤ z ≤ 0.03) and has a lamellar structure composed of secondary particles, each of which is configured of primary particles. A concentrated titanium layer is formed on the surfaces of the primary particles and the grain boundaries among the primary particles. Since the concentrated titanium layers, which are present on the surfaces of the primary particles and/or the grain boundaries among the primary particles, function as lithium ion conductors, intercalation and deintercalation of lithium ions become smooth. Consequently, if a positive electrode is formed using this lithium nickel complex oxide as a positive electrode active material, a secondary battery having high capacity, high stability and excellent output characteristics can be produced.
Inventors:
IMAIZUMI, Shin (SUMITOMO METAL MINING CO. LTD., 17-3, Isoura-cho, Niihama-sh, Ehime 02, 〒7920002, JP)
今泉 心 (〒02 愛媛県新居浜市磯浦町１７番３号住友金属鉱山株式会社 機能材料事業部内 Ehime, 〒7920002, JP)
KOKADO, Rei (SUMITOMO METAL MINING CO. LTD., 17-5, Isoura-cho, Niihama-sh, Ehime 02, 〒7920002, JP)
今泉 心 (〒02 愛媛県新居浜市磯浦町１７番３号住友金属鉱山株式会社 機能材料事業部内 Ehime, 〒7920002, JP)
KOKADO, Rei (SUMITOMO METAL MINING CO. LTD., 17-5, Isoura-cho, Niihama-sh, Ehime 02, 〒7920002, JP)
Application Number:
JP2011/001977
Publication Date:
January 26, 2012
Filing Date:
April 01, 2011
Export Citation:
Assignee:
SUMITOMO METAL MINING CO., LTD. (11-3, Shinbashi 5-Chome, Minato-k, Tokyo 16, 〒1058716, JP)
住友金属鉱山株式会社 (〒16 東京都港区新橋５丁目１１番３号 Tokyo, 〒1058716, JP)
IMAIZUMI, Shin (SUMITOMO METAL MINING CO. LTD., 17-3, Isoura-cho, Niihama-sh, Ehime 02, 〒7920002, JP)
今泉 心 (〒02 愛媛県新居浜市磯浦町１７番３号住友金属鉱山株式会社 機能材料事業部内 Ehime, 〒7920002, JP)
住友金属鉱山株式会社 (〒16 東京都港区新橋５丁目１１番３号 Tokyo, 〒1058716, JP)
IMAIZUMI, Shin (SUMITOMO METAL MINING CO. LTD., 17-3, Isoura-cho, Niihama-sh, Ehime 02, 〒7920002, JP)
今泉 心 (〒02 愛媛県新居浜市磯浦町１７番３号住友金属鉱山株式会社 機能材料事業部内 Ehime, 〒7920002, JP)
International Classes:
H01M4/525; C01G53/00
Attorney, Agent or Firm:
YAMAUCHI, Yasunobu et al. (YAMAUCHI Patent Attorneys, Nihon Seimei-Takamatsu-Ekimae Bldg. 3F1-1-8, Kotobuki-ch, Takamatsu-shi Kagawa 23, 〒7600023, JP)
Claims: