• 专利标题:   Silicon-containing slurry useful for manufacturing silicon-containing electrode, comprises poly(carboxylic acid) binder and particulate anode active material in mixed solvent system comprising solvents comprising N,N-dimethyl-acetamide compound, water and/or organic solvent.
  • 专利号:   US2021376327-A1, US11532818-B2
  • 发明人:   TRASK S, JANSEN A, SHI Z, ZHANG L
  • 专利权人:   UCHICAGO ARGONNE LLC
  • 国际专利分类:   C09D001/00, C09D133/08, C08K003/04, C08K003/02, H01M004/134, H01M010/0525, H01M004/1395, H01M004/04, H01M004/38, H01M004/62, C09D007/20, C09D007/40, H01B001/22, H01M004/02
  • 专利详细信息:   US2021376327-A1 02 Dec 2021 H01M-004/62 202207 English
  • 申请详细信息:   US2021376327-A1 US886908 29 May 2020
  • 优先权号:   US886908

▎ 摘  要

NOVELTY - Silicon-containing slurry comprises a poly(carboxylic acid) binder and a particulate anode active material in a mixed solvent system comprising a first solvent and a second solvent that is miscible with the first solvent, where the first solvent is an N,N-dimethyl-acetamide compound (I). The second solvent is chosen from water and/or organic solvent. The volume ratio of first solvent and the second solvent in the mixed solvent system is 99:1-1:9. The organic solvent comprises one or more material chosen from an alcohol, an ether, a nitrile, and an amide which is different from compound (I) of the first solvent. The particulate anode active material comprises silicon-containing particles, or silicon-containing particles and/or carbon particles. USE - The silicon-containing slurry is useful for manufacturing a silicon-containing electrode for a lithium electrochemical cell, and a battery, and for lithium battery applications. ADVANTAGE - The silicon-containing slurry improved anode capacity, enhanced dispersion of anode slurries, improved quality of laminates, and excellent cell performance. DETAILED DESCRIPTION - Silicon-containing slurry comprises a poly(carboxylic acid) binder and a particulate anode active material in a mixed solvent system comprising a first solvent and a second solvent that is miscible with the first solvent, where the first solvent is an N,N-dimethyl-acetamide compound of formula (I). The second solvent is chosen from water and/or organic solvent. The volume ratio of first solvent and the second solvent in the mixed solvent system is 99:1-1:9. The organic solvent comprises one or more material chosen from an alcohol, an ether, a nitrile, and an amide which is different from compound (I) of the first solvent. The particulate anode active material comprises silicon-containing particles, or silicon-containing particles and/or carbon particles; or a poly(carboxylic acid) binder and a particulate anode active material in a solvent comprising 10-90 vol.% N-methylacetamide in water, where the particulate anode active material comprises silicon nanoparticles, or silicon nanoparticles and/or carbon particles. The slurry comprises 50-90 wt.% anode active material and 10-50 wt.% binder. The carbon particles comprise one or more materials chosen from graphite, carbon black, carbon nanotubes, carbon nanofibers, hard carbon, and graphene. R1, R2, and R3 = H, alkyl, alkoxy, or a polyether group. INDEPENDENT CLAIMS are also included for: (1) A method for manufacturing a silicon-containing electrode, involving coating the slurry onto a conductive current collector, and drying the resulting coating; (2) An electrode, which is formed by the above-mentioned method; (3) A lithium electrochemical cell comprising an anode, a cathode, a lithium ion-conducting separator between the anode and the cathode, and a lithium ion-containing electrolyte contacting the anode, the cathode, and the separator, where the anode is the electrode; (4) A battery comprising electrochemical cells electrically connected together in series, in parallel, or in both series and parallel;