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1. WO2020110942 - LITHIUM ION SECONDARY BATTERY NEGATIVE ELECTRODE AND LITHIUM ION SECONDARY BATTERY

Publication Number WO/2020/110942
Publication Date 04.06.2020
International Application No. PCT/JP2019/045805
International Filing Date 22.11.2019
IPC
H01M 4/587 2010.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
4Electrodes
02Electrodes composed of, or comprising, active material
36Selection of substances as active materials, active masses, active liquids
58of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
583Carbonaceous material, e.g. graphite-intercalation compounds or CFx
587for inserting or intercalating light metals
C01B 32/205 2017.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF
32Carbon; Compounds thereof
20Graphite
205Preparation
C01B 32/21 2017.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF
32Carbon; Compounds thereof
20Graphite
21After-treatment
H01M 4/133 2010.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
4Electrodes
02Electrodes composed of, or comprising, active material
13Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
133Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
H01M 4/36 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
4Electrodes
02Electrodes composed of, or comprising, active material
36Selection of substances as active materials, active masses, active liquids
CPC
C01B 32/205
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; ; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
32Carbon; Compounds thereof
20Graphite
205Preparation
C01B 32/21
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; ; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
32Carbon; Compounds thereof
20Graphite
21After-treatment
H01M 4/133
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
4Electrodes
02Electrodes composed of or comprising active material
13Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
133Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
H01M 4/36
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
4Electrodes
02Electrodes composed of or comprising active material
36Selection of substances as active materials, active masses, active liquids
H01M 4/587
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
4Electrodes
02Electrodes composed of or comprising active material
36Selection of substances as active materials, active masses, active liquids
58of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
583Carbonaceous material, e.g. graphite-intercalation compounds or CFx
587for inserting or intercalating light metals
Applicants
  • 昭和電工株式会社 SHOWA DENKO K. K. [JP]/[JP]
Inventors
  • 原田 大輔 HARADA Daisuke
  • 井上 浩文 INOUE Hirofumi
  • 香野 大輔 KOHNO Daisuke
Agents
  • 特許業務法人SSINPAT SSINPAT PATENT FIRM
Priority Data
2018-22011726.11.2018JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) LITHIUM ION SECONDARY BATTERY NEGATIVE ELECTRODE AND LITHIUM ION SECONDARY BATTERY
(FR) ÉLECTRODE NÉGATIVE POUR BATTERIE SECONDAIRE AU LITHIUM-ION, ET BATTERIE SECONDAIRE AU LITHIUM-ION
(JA) リチウムイオン二次電池用負極及びリチウムイオン二次電池
Abstract
(EN)
The present invention relates to a lithium ion secondary battery negative electrode that comprises a mixture layer that includes a negative electrode active material. The density of the mixture layer is 1.60–1.90 g/cm3. In a log differential pore volume distribution for the mixture layer as measured by mercury intrusion, there is a pore diameter D1 that has a maximum value at 0.50–2.00 µm. The negative electrode active material includes artificial graphite and natural graphite. The artificial graphite is 20–80 mass% of the total of the artificial graphite and the natural graphite. The circularity of the artificial graphite is 0.82–0.90. The circularity of the natural graphite is 0.91–0.99. The compressive strength of the artificial graphite and the natural graphite is 0.1–15 MPa. The D50 of the artificial graphite is 10–30 µm. The lithium ion secondary battery negative electrode has excellent large-current discharge characteristics and an excellent cycle capacity retention rate.
(FR)
L'invention concerne une électrode négative pour batterie secondaire au lithium-ion qui est équipée d'une couche de mélange contenant une matière active d'électrode négative. La densité de la couche de mélange est supérieure ou égale à 1,60g/cm3 et inférieure ou égale à 1,90g/cm3. Un diamètre de pore (D1) présentant une valeur maximale supérieure ou égale à 0,50μm et inférieure ou égale à 2,00μm, est présent dans une distribution du volume poreux différentiel logarithmique de la couche de mélange mesurée selon un procédé d'enfoncement du mercure. Ladite matière active d'électrode négative contient un graphite artificiel et un graphite naturel. Le rapport de mélange dudit graphite artificiel est supérieur ou égal à 20% en masse et inférieur ou égal à 80% en masse pour le total dudit graphite artificiel et dudit graphite naturel. Le degré de circularité dudit graphite artificiel est supérieur ou égal à 0,82 et inférieur ou égal à 0,90. Le degré de circularité dudit graphite naturel est supérieur ou égal à 0,91 et inférieur ou égal à 0,99. La résistance à la compression dudit graphite artificiel et dudit graphite naturel est supérieure ou égale à 0,1MPa et inférieure ou égale à 15MPa. La valeur D50 dudit graphite artificiel est supérieure ou égale à 10μm et inférieure ou égale à 30μm. Enfin, l'électrode négative pour batterie secondaire au lithium-ion de l'invention se révèle excellente en termes de caractéristiques de décharge de courant de forte intensité et de taux de maintien de capacité cyclique.
(JA)
本発明は、負極活物質を含む合剤層を備えたリチウムイオン二次電池用負極であって、合剤層の密度が1.60g/cm3以上1.90g/cm3以下であり、水銀圧入法により測定された合剤層のLog微分細孔容積分布において0.50μm以上2.00μm以下に極大値を示す細孔径D1が存在し、前記負極活物質は人造黒鉛と天然黒鉛を含み、前記人造黒鉛と前記天然黒鉛の合計に対して前記人造黒鉛の配合比率が20質量%以上80質量%以下であり、前記人造黒鉛の円形度は0.82以上0.90以下であり、前記天然黒鉛の円形度は0.91以上0.99以下であり、前記人造黒鉛及び前記天然黒鉛の圧縮強度が0.1MPa以上15MPa以下であり、前記人造黒鉛のD50は10μm以上30μm以下である、大電流放電特性とサイクル容量維持率に優れたリチウムイオン二次電池用負極に関する。
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