Positive electrode mixture and non-aqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-10193141-B2
Application number	US-201515121110-A
Country	US
Kind code	B2
Filing date	Feb 24, 2015
Priority date	Feb 27, 2014
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

An object of the present invention is to provide a positive electrode mixture capable of conducting stable charging and discharging with a less amount of gasses generated which has an operating voltage or an initial crystal phase transition voltage of not less than 4.5 V on the basis of lithium. The present invention relates to a positive electrode mixture comprising carbon black having a bulk density of not more than 0.1 g/cm3, a crystallite size of 10 to 40 Å, an iodine adsorption of 1 to 150 mg/g, a volatile content of not more than 0.1% and a metal impurity content of not more than 20 ppm, and a positive electrode active substance having an operating voltage or an initial crystal phase transition voltage of not less than 4.5 V on the basis of lithium.

First claim

The invention claimed is:

1. A positive electrode mixture comprising carbon black having a bulk density of not more than 0.1 g/cm 3 , a crystallite size of 10 to 40 Å, an iodine adsorption of 1 to 150 mg/g, a volatile content of not more than 0.1% and a metal impurity content of not more than 20 ppm, and a positive electrode (cathode) active substance having an operating voltage or an initial crystal phase transition voltage of not less than 4.5 V on the basis of lithium.

2. The positive electrode mixture according to claim 1 , wherein the positive electrode active substance is at least one substance selected from the group consisting of Li(M1xMn 2-x )O 4 wherein x is more than 0 and less than 1 (0<x<1), and M1 is Cr, Co, Ni or Cu; LiM2VO 4 wherein M2 is Co or Ni; yLi 2 MnO 3 .(1−y)LiM3O 2 wherein y is more than 0 and less than 1 (0<y<1), and M3 is Ni, Co, Mn, Fe or Ti; and LiCoPO 4.

3. The positive electrode mixture according to claim 1 , wherein a content of the carbon black in the positive electrode mixture is 1 to 20% by mass.

4. A non-aqueous electrolyte secondary battery comprising the positive electrode mixture as claimed in claim 1 .

5. A positive electrode mixture comprising carbon black having a bulk density of not more than 0.1 g/cm 3 , a crystallite size of 10 to 40 Å, an iodine adsorption of 1 to 150 mg/g measured according to JIS K 1474, a volatile content of not more than 0.1% and a metal impurity content of not more than 20 ppm, and a positive electrode (cathode) active substance having an operating voltage or an initial crystal phase transition voltage of not less than 4.5 V on the basis of lithium.

6. The positive electrode mixture according to claim 5 , wherein the positive electrode active substance is at least one substance selected from the group consisting of Li(M1 x Mn 2-x )O 4 wherein x is more than 0 and less than 1 (0<x<1), and M1 is Cr, Co, Ni or Cu; LiM2VO 4 wherein M2 is Co or Ni; yLi 2 MnO 3 .(1−y)LiM3O 2 wherein y is more than 0 and less than 1 (0<y<1), and M3 is Ni, Co, Mn, Fe or Ti; and LiCoPO 4 .

7. The positive electrode mixture according to claim 5 , wherein a content of the carbon black in the positive electrode mixture is 1 to 20% by mass.

8. A non-aqueous electrolyte secondary battery comprising the positive electrode mixture as claimed in claim 5 .

Assignees

• Toda Kogyo Corp
• Denka Company Ltd
• Toda Kogyo Corp

Inventors

• Kajiyama Akihisa
• Santoki Teruaki
• Morita Daisuke
• Masaki Ryuta
• Sugihara Takahiko
• Wakiyama Tsuyoshi
• Matsumoto Kazutoshi
• Yoda Akira
• Inada Taro
• Yokota Hiroshi
• Kawasaki Takashi

Classifications

• H01M4/131 Primary

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/136

  Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title