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1. (WO2012172831) NONAQUEOUS ELECTROLYTE SECONDARY BATTERY
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2012/172831 International Application No.: PCT/JP2012/054376
Publication Date: 20.12.2012 International Filing Date: 23.02.2012
IPC:
H01M 10/0525 (2010.01) ,H01M 4/36 (2006.01) ,H01M 4/485 (2010.01) ,H01M 4/58 (2010.01)
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
M
PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
10
Secondary cells; Manufacture thereof
05
Accumulators with non-aqueous electrolyte
052
Li-accumulators
0525
Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
M
PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
4
Electrodes
02
Electrodes composed of, or comprising, active material
36
Selection of substances as active materials, active masses, active liquids
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
M
PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
4
Electrodes
02
Electrodes composed of, or comprising, active material
36
Selection of substances as active materials, active masses, active liquids
48
of inorganic oxides or hydroxides
485
of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
M
PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
4
Electrodes
02
Electrodes composed of, or comprising, active material
36
Selection of substances as active materials, active masses, active liquids
58
of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
Applicants:
株式会社 東芝 KABUSHIKI KAISHA TOSHIBA [JP/JP]; 東京都港区芝浦一丁目1番1号 1-1, Shibaura 1-chome, Minato-ku, Tokyo 1058001, JP (AllExceptUS)
松野真輔 MATSUNO, Shinsuke; null (UsOnly)
山本大 YAMAMOTO, Dai; null (UsOnly)
佐竹秀喜 SATAKE, Hideki; null (UsOnly)
高見則雄 TAKAMI, Norio; null (UsOnly)
Inventors:
松野真輔 MATSUNO, Shinsuke; null
山本大 YAMAMOTO, Dai; null
佐竹秀喜 SATAKE, Hideki; null
高見則雄 TAKAMI, Norio; null
Agent:
池上徹真 IKEGAMI, Tetsuma; 神奈川県横浜市西区北幸二丁目9番40号 銀洋ビル403号室 No. 403 Ginyou Bldg., 9-40, Kitasaiwai 2-chome, Nishi-ku, Yokohama-shi, Kanagawa 2200004, JP
Priority Data:
2011-13355515.06.2011JP
Title (EN) NONAQUEOUS ELECTROLYTE SECONDARY BATTERY
(FR) ACCUMULATEUR À ÉLECTROLYTE NON AQUEUX
(JA) 非水電解質二次電池
Abstract:
(EN) [Problem] The purpose of the present invention is to provide a nonaqueous electrolyte secondary battery which comprises a positive electrode active material having excellent water resistance. [Solution] The nonaqueous electrolyte secondary battery of an embodiment of the present invention is characterized by comprising: a positive electrode that contains positive electrode active material particles, each of which is configured of a central part formed of an olivine-type LiFePO4, an intermediate part arranged around the central part and containing a lithium iron phosphate that is represented by LiFexPyOz, and a surface part arranged around the intermediate part and containing a lithium iron phosphate that is represented by LiFeaPbOc; and a negative electrode that contains lithium titanate. The nonaqueous electrolyte secondary battery is also characterized in that: the molar concentration ratio of P to Fe in the lithium iron phosphate in the central part is larger than the average of x/y of the LiFexPyOz; the average of a/b of the LiFeaPbOc in the surface part is smaller than the average of x/y of the LiFexPyOz in the positive electrode active material particles; and the central part has a region where the x/y of the LiFexPyOz continuously or intermittently increases from the surface part side toward the central part side.
(FR) L'objectif de la présente invention est de fournir un accumulateur à électrolyte non aqueux qui comprend un matériau actif d'électrode positive offrant une excellente résistance à l'eau. L'accumulateur à électrolyte non aqueux selon un mode de réalisation de la présente invention est caractérisé en ce qu'il comprend : une électrode positive qui contient des particules de matériau actif pour électrode positive, chacune d'entre elles étant constituée d'une partie centrale formée de LiFePO4 de type olivine, d'une partie intermédiaire disposée autour de la partie centrale et contenant un phosphate de lithium et de fer qui est représenté par LiFexPyOz et une partie de surface disposée autour de la partie intermédiaire et contenant un phosphate de lithium et de fer qui est représenté par LiFeaPbOc ; et une électrode négative qui contient du titanate de lithium. L'accumulateur à électrolyte non aqueux est également caractérisé en ce que : le rapport de concentration molaire entre P et Fe dans le phosphate de lithium et de fer de la partie centrale est supérieur à la moyenne de x/y dans LiFexPyOz ; la moyenne de a/b dans LiFeaPbOc dans la partie de surface est inférieure à la moyenne de x/y dans LiFexPyOz dans les particules de matériau actif pour électrode positive ; et la partie centrale possède une région dans laquelle le rapport x/y de LiFexPyOz augmente de manière continue ou échelonnée du côté partie de surface vers côté partie centrale.
(JA) 【課題】耐水性に優れた正極活物質を有する非水電解質二次電池を提供することを目的とする。 【解決手段】実施形態の非水電解質二次電池は、中心部にオリビン型LiFePOと、前記中心部の外側にLiFeで表すことのできるリチウムリン酸鉄を有する中間部と、前記中間部の外側にLiFeで表すことのできるリチウムリン酸鉄を有する表面部とで構成される正極活物質粒子を含有する正極と、チタン酸リチウムを含有する負極とを備え、前記中心部のリチウムリン酸鉄のPに対するFeのモル濃度比は、前記LiFeのx/yの平均より大きく、前記正極活物質粒子の表面部のLiFeのa/bの平均値は、前記LiFeのx/yの平均より小さく、前記中心部のLiFeのx/yが表面部から中心部方向に向かって、連続的又は断続的に大きくなる領域が含まれることを特徴とする。
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Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IS, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG)
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)
Also published as:
EP2722923US20140106225CN103608961