• 专利标题:   Lithium ion positive electrode coating for lithium ion battery includes conductive binder composed of emulsion of acrylic multi-component polymer and conductive material, conductive agent e.g. graphene and positive electrode active material.
  • 专利号:   CN110911644-A
  • 发明人:   OU R, ZHU Y, HUANG G, HUANG Y, WEI L
  • 专利权人:   SHENZHEN ZHUONENG NEW ENERGY TECHNOLOGY
  • 国际专利分类:   H01M010/0525, H01M010/0587, H01M004/04, H01M004/136, H01M004/1397, H01M004/58, H01M004/62
  • 专利详细信息:   CN110911644-A 24 Mar 2020 H01M-004/136 202038 Pages: 17 Chinese
  • 申请详细信息:   CN110911644-A CN11046281 30 Oct 2019
  • 优先权号:   CN11046281

▎ 摘  要

NOVELTY - A lithium ion positive electrode coating comprises 2-6 wt.% conductive binder, 0.5-6 wt.% conductive agent, and 100% positive electrode active material. The conductive adhesive is mixed emulsion of acrylic multi-component polymer and conductive material, where conductive material is 0.2-5.0 wt.% of the conductive adhesive, and the remaining is acrylic multi-component copolymer. The acrylic multi-component copolymer is a chain structure that is connected with a lithium-containing functional group. The conductive material comprises conductive graphite, conductive carbon black, SP, acetylene black, carbon nanotubes, vapor grown carbon nanofibers (VGCF), and/or graphene. The conductive agents comprises conductive graphite, conductive carbon black, SP, acetylene black, carbon nanotube, VGCF and/or graphene. USE - The lithium ion positive electrode coating is used for lithium ion battery. ADVANTAGE - The coating reduces self impedance of the lithium iron phosphate, realizes free and rapid migration of lithium ions under low temperature conditions, improves electronic conductive ability and lithium ion conductive ability of lithium iron phosphate, realizes free and rapid migration of lithium ions under low temperature conditions. The resistance of the lithium ion positive electrode coating is reduced, which is beneficial to improve the low-temperature discharge performance of a lithium-ion battery. DETAILED DESCRIPTION - A lithium ion positive electrode coating comprises 2-6 wt.% conductive binder, 0.5-6 wt.% conductive agent, and 100% positive electrode active material. The positive electrode active material is of formula LiMxFe (1-x)PO4. The conductive adhesive is the mixed emulsion of acrylic multi-component polymer and conductive material, where conductive material is 0.2-5.0 wt.% of the conductive adhesive, and the remaining is acrylic multi-component copolymer. The acrylic multi-component copolymer is a chain structure that is connected with a lithium-containing functional group. The conductive material comprises conductive graphite, conductive carbon black, SP, acetylene black, carbon nanotubes, vapor grown carbon nanofibers (VGCF), and/or graphene. The conductive agents comprises conductive graphite, conductive carbon black, SP, acetylene black, carbon nanotube, VGCF and/or graphene. M=Ni, Co, and/or Mn; and x=0.04-0.3. INDEPENDENT CLAIMS are included for: (1) lithium ion battery positive electrode sheet comprising lithium ion positive electrode coating coated on surface of positive electrode current collector; (2) preparation method of the lithium ion positive electrode coating; (3) lithium ion battery comprising lithium ion battery positive electrode sheet as a positive electrode; and (4) mounting method of lithium ion battery.