▎ 摘　　要

NOVELTY - Lithium-ion battery binder i.e. substituted 2-(hydroxymethyl)-5-(lithiooxy)-4-methyl-5-oxopentanoic acid (I) is new. USE - (I) is useful for lithium battery pole piece (claimed). ADVANTAGE - (I): can reduce the intrinsic lithium ion diffusion resistance of the binder by modifying the water-soluble polymer, introducing acrylic acid and other unsaturated olefin monomers; improves the power performance of lithium-ion batteries at low temperatures and reducing internal resistance; improves the lithiation efficiency of the carboxy group in acrylic acid on the one hand, and on the other hand, some polar groups in the side chain can also self-crosslink or react with the surface of the active material to form a reliable bond the network; inhibits the expansion of the pole piece, ensures the stability, and improves the cycle life of the battery. DETAILED DESCRIPTION - Lithium-ion battery binder i.e. substituted 2-(hydroxymethyl)-5-(lithiooxy)-4-methyl-5-oxopentanoic acid of formula (I) is new. M group = repeating structural unit of water-soluble polymer containing a hydroxy group, number of repeating structural unit modified by the hydroxy group is p, and number of repeating structural unit with unmodified hydroxy group is k; a and b = number of repeating units of acrylic acid (including methacrylate, lithium acrylate, sodium acrylate, potassium acrylate, lithium methacrylate, sodium methacrylate and potassium methacrylate) and acrylate lithium in the copolymer composition; c1, c2...cm = number of repeating units of unsaturated olefin monomer (including vinyl silane monomer (including vinyltrimethoxysilane, vinyltriethoxysilane, vinyl tri-tert-butylperoxysilane, vinyltris(2-methoxyethoxy)silane, vinyltriisopropoxysilane, vinyltris(trimethylsiloxy)silane, vinyltris(triethylsiloxy)silane, vinyltris(dimethylsiloxy)silane, γ-methacryloxypropyltrimethoxysilane or γ-methacryloxypropyltris(β-trimethoxyethoxysilane)), acrylate, acrylamide, acrylonitrile, vinyl acetate, vinyl carbonate, fluorinated ethylene carbonate or propylene carbonate) other than acrylic acid monomer; m = number of types of unsaturated olefin monomer other than acrylic acid monomer, 1-3; p, k, m, a, b, c1, c2...cm= 0-100000000; p, b and m = not 0; and R1-R8...R4m-1-R4m-4= H, phenyl, hydroxy, carboxy, amino, cyano, amido, -SO3Na, 1-methylpyrrolidin-2-one, methyl formate compound of formula (II), acetic acid compound of formula (III), methyl formate compound of formula (IV), acetamide compound of formula (V), acetic acid compound of formula (VI), N-methylformamide compound of formula (VII), methylbenzene compound of formula (VIII), siloxy, or 1-8C straight-chain or branched-chain alkyl. INDEPENDENT CLAIMS are also included for: Preparation of (I); and Lithium battery pole piece comprising electrode active material, thickening agent, conductive agent, emulsion and lithium ion battery binder, where lithium battery pole piece is a positive pole piece or a negative pole piece.