• 专利标题:   Conductive aid used in positive electrode for nonaqueous electrolyte secondary battery, comprises carbon material having graphene laminated structure, and resin, and is dispersed in N-methyl-2-pyrrolidone to form dispersion liquid.
  • 专利号:   WO2022102693-A1, TW202230858-A, JP2021572934-X
  • 发明人:   KUNISAWA Y, SAWADA Y, MASUDA H
  • 专利权人:   SEKISUI CHEM CO LTD
  • 国际专利分类:   C01B032/19, H01M004/13, H01M004/62, H01M010/05
  • 专利详细信息:   WO2022102693-A1 19 May 2022 202249 Pages: 49 Japanese
  • 申请详细信息:   WO2022102693-A1 WOJP041478 11 Nov 2021
  • 优先权号:   JP189611

▎ 摘  要

NOVELTY - A conductive aid comprises a carbon material having a graphene laminated structure, and a resin (13), and is dispersed in N-methyl-2-pyrrolidone to form dispersion liquid. The number of particles of the conductive aid in the dispersion liquid is 1500 million particles/mg C or more. The conductive aid has a-value of 3-100 and b-value of 20-100, which is calculated using the amount of resin in the conductive aid, BET specific surface area of the conductive aid, the amount of resin in the conductive aid after heating at 600 degrees C for 5 hours, and BET specific surface area of the conductive aid after heating at 600 degrees C for 5 hours. USE - Conductive aid used in positive electrode for non aqueous electrolyte secondary battery (all claimed). Uses include but are not limited to mobile device, hybrid vehicle, electric vehicle, household power storage application, etc. ADVANTAGE - The conductive aid provides nonaqueous electrolyte secondary battery having excellent safety, and suppressed temperature rise during charging/discharging at a large current. DETAILED DESCRIPTION - A conductive aid comprises a carbon material having a graphene laminated structure, and a resin, and is dispersed in N-methyl-2-pyrrolidone to form dispersion liquid. The number of particles of the conductive auxiliary agent in the dispersion liquid is 1500 million particles/mgC or more. The conductive aid has a-value of 3-100 and b-value of 20-100, and satisfy the equations: a = (y0-y1)/(x0 -x1), and b = y0-(y0-y1)x0/(x0-x1), where x0 is the amount of resin in the conductive aid in wt.%, y0 is the BET specific surface area of the conductive aid in m2/g, x1 is the amount of resin in the conductive aid after heating at 600 degrees C for 5 hours, and y1 is the BET specific surface area of the conductive aid after heating at 600 degrees C for 5 hours. INDEPENDENT CLAIMS are included for the following: (1) positive electrode, which comprises a positive electrode active material and the conductive aid; and (2) nonaqueous electrolyte secondary battery. DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of the partially peeled graphite. Partially peelable graphite (10) Edge portion (11) Central portion (12) Resin (13)