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POSITIVE ELECTRODE FOR LITHIUM-ION RECHARGEABLE BATTERY, LITHIUM-ION RECHARGEABLE BATTERY, AND METHOD FOR PRODUCING POSITIVE ELECTRODE FOR LITHIUM-ION RECHARGEABLE BATTERY

Foreign code F200010213
File No. (N18035)
Posted date Aug 4, 2020
Country WIPO
International application number 2019JP045732
International publication number WO 2020105729
Date of international filing Nov 22, 2019
Date of international publication May 28, 2020
Priority data
  • P2018-219707 (Nov 22, 2018) JP
Title POSITIVE ELECTRODE FOR LITHIUM-ION RECHARGEABLE BATTERY, LITHIUM-ION RECHARGEABLE BATTERY, AND METHOD FOR PRODUCING POSITIVE ELECTRODE FOR LITHIUM-ION RECHARGEABLE BATTERY
Abstract Provided is a lithium-ion rechargeable battery which combines excellent electrical conductivity and adhesion of the electrode active material with respect to the collector, and which can dramatically improve battery characteristics compared to the prior art. This positive electrode for lithium-ion rechargeable battery comprises a collector and an electrode active material-containing layer provided on the collector. The electrode active material-containing layer contains active material particles and an electroconductive material which connects active material particles. The mass ratio of active material particles:electroconductive material:other components in the electrode active material-containing layer is 95-99.7:0.3-5:0-1. The electroconductive material contains a first long carbon material having a first length, and a second long carbon material having a second length which is greater than the first length. The ratio of the second length with respect to the first length falls within the range of 2 to 50, inclusive.
Outline of related art and contending technology BACKGROUND ART
In recent years, performance of the mobile device, a built-in lithium ion secondary battery of high output, high energy density is demanded. The lithium ion secondary battery positive electrode, negative electrode, electrolyte, and separator and the configuration, the output of the batteries is high, the resistance of the components is required. Of the main target can be a low resistance, since the positive and negative electrodes, electrode active material particles constituting the powder, the conductive material, binder, and a current collector to materials such as have been made various studies.
Conventional, lithium ion secondary battery for making the electrode, the slurry for electrode formation of the non-aqueous solvent is applied onto the current collector, drying, through mechanical bonding, the electrode active material containing layer formed on the current collector employed is a method. For example, to Patent Document 1, fluorine-containing cyclic carbonate and 15-40 volume %, the fluorine-containing chain carbonate and/or fluorine-containing chain ether that contain a total of 45-85 volume %, the content of the fluorine-free cyclic carbonate in the nonaqueous solvent to 10 volume % or less, and the non-aqueous electrolyte including lithium salt, manganese-containing composite oxide as the active material containing a positive electrode, and a lithium ion secondary battery is provided. Patent Document 1 is, on one side of a current collector made of an aluminum foil, such as polyvinylidene fluoride (PVDF) binder of the slurry for the positive electrode is coated by a bar coater, the positive electrode slurry is coated and dried current collector, the positive electrode sheet obtained in the compression molding using a roll press, and then drying in, to obtain a positive electrode.
In addition, without using any binder in the electrode current collector an electrode active material particle powder has been made an attempt on the processing. Patent Document 2 is, as the positive electrode active material for a positive electrode the metal complex crosslinking cyano prussian blue type of the current collector and electrolytic deposition on the metal surface, and a thin-film electrode is provided.
On the other hand, a binder and a current collector without using a metal, a plurality of fibers of the electrode active material powder of the network technique is also fixed. Non-Patent Document 1 is for example, fiber diameter 11nm, fiber length 370μm of carbon nanotubes, and the ultrasonic electrode active material particle powder is dispersed in the solvent, filtration, and drying the solution obtained, and a nonwoven fabric-like electrode is provided.
However, in the technique of Patent Document 1, during of the material constituting the electrodes used for the insulating binder, and the resistance is unavoidable, the binder is not used, a current collector and active material particles was a problem that the adhesion is insufficient. In addition, the technique of Patent Document 2, for the electrolytic deposition of the high cost, in addition, the active material for a thin-film form may be provided on the electrode cannot be increased, the energy density of the problem is not raised. In the technique of Non-Patent Document 3, filtering devices of the filter cake was dried, and retrieving the manufacturing method of the invention as an electrode, a large amount of high-area electrode is a problem that it is difficult. In addition, in order to ensure the conductivity of the obtained non-woven fabric bonded to the support electrodes and the metal case, so as to be crimped are mechanically interconnected, the joining strength is not sufficiently obtained. Therefore, sufficient battery characteristics can be obtained is far.
Scope of claims (In Japanese)[請求項1]
 集電体と、前記集電体上に設けられた電極活物質含有層とを備え、
 前記電極活物質含有層は、活物質粒子と、活物質粒子同士を接続する導電材とを含み、
 前記電極活物質含有層における前記活物質粒子:前記導電材:その他の成分の質量比が、95~99.7:0.3~5:0~1であり、
 前記導電材は、第1の長さを有する第1長尺状炭素材料と、前記第1の長さよりも大きい第2の長さを有する第2長尺状炭素材料とを含み、
 前記第1の長さに対する前記第2の長さの比が、2以上50以下である、リチウムイオン二次電池用正極。

[請求項2]
 前記第1長尺状炭素材料が、多層カーボンナノチューブである第1カーボンナノチューブで構成され、
 前記第2長尺状炭素材料が、単層カーボンナノチューブである第2カーボンナノチューブで構成され、
 前記第1カーボンナノチューブ:前記第2カーボンナノチューブの質量比が、85~99:1~15である、請求項1記載のリチウムイオン二次電池用正極。

[請求項3]
 前記第1長尺状炭素材料が、前記活物質粒子における一の二次粒子を構成する複数の一次粒子の粒子同士を連結すると共に、隣接する二次粒子をそれぞれ構成する複数の一次粒子の粒子同士を連結しており、
 前記第2長尺状炭素材料が、前記活物質粒子において複数の二次粒子をそれぞれ構成する複数の一次粒子間を跨ぐように配置されて前記二次粒子同士を連結している、請求項1に記載のリチウムイオン二次電池用正極。

[請求項4]
 請求項1~3のいずれか1項に記載のリチウムイオン二次電池用正極と、負極と、電解質とを備える、リチウムイオン二次電池。

[請求項5]
 第1の長さを有する第1長尺状炭素材料と前記第1の長さよりも大きい第2の長さを有する第2長尺状炭素材料とを含み、前記第1の長さに対する前記第2の長さの比が2以上50以下である導電材を準備する工程と、
 前記導電材と活物質粒子とを含む電極形成用材料を集電体に塗布して、電極活物質含有層を形成する工程と、
 を有する、リチウムイオン二次電池用正極の製造方法。

[請求項6]
 前記第1長尺状炭素材料が、多層カーボンナノチューブである第1カーボンナノチューブで構成され、
 前記第2長尺状炭素材料が、単層カーボンナノチューブである第2カーボンナノチューブで構成され、
 前記第1カーボンナノチューブ:前記第2カーボンナノチューブの質量比が、85~99:1~15である、請求項5に記載のリチウムイオン二次電池用正極の製造方法。

[請求項7]
バインダーを含まない前記電極形成用材料を用いて、前記電極活物質含有層を形成する、請求項5又は6に記載のリチウムイオン二次電池用正極の製造方法。
  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • SHINSHU UNIVERSITY
  • Inventor
  • ZETTSU Nobuyuki
  • TESHIMA Katsuya
  • KIM Daewook
IPC(International Patent Classification)
Specified countries National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA 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
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: 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
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
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