▎ 摘　　要

NOVELTY - A composite anode comprises porous anode framework and a filled polymer electrolyte. The porous anode framework is composed of anode active material, 10-12.5 %mass conductive agent and 10-12.5 %mass binder. The filled polymer electrolyte is composed of 10-16 %mass lithium salt, polymer monomer and 0.5-1 %mass initiator. The anode active material in the porous anode framework is lithium cobaltate, lithium manganate, lithium iron phosphate or lithium nickel cobalt manganate. USE - Composite anode for solid-state lithium battery (claimed) used in energy power vehicle. ADVANTAGE - The composite anode provides solid lithium battery with improved dynamic performance of the electrode material and high voltage tolerance, and reduces the polarization of the battery and the interface impedance, and improves the utilization rate of the active substance. The porous anode framework has high electrochemical stability, and can generate molecular interaction with the solid electrolyte layer, and enhances the electro-chemical stability of electrode/electrolyte interface and interlayer bonding force, avoids the interlayer stripping in the battery circulation process, and avoids the mechanical contact caused by stress accumulation, thus improving the structural integrity of the anode. The lithium salt in the polymer electrolyte can generate lithium fluoride, lithium carbonate, and other beneficial components on the surface of active material, which can improve the dynamic performance and stability of the porous electrode material. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a preparation of a composite anode, which involves (1) dissolving nitrate in solvent (I) and stirring at room temperature to form a uniform solution, adding the high molecular polymer to the obtained solution and stirring at room temperature to obtain a uniform and viscous electrospinning precursor, (2) adding the electrospinning precursor prepared in step (1) into the syringe, using a stainless steel flat-headed needle as a spinning nozzle, a nickel mesh as a spinning receiving mesh, and using an external direct current power supply to form an electrostatic field for electrospinning to obtain electrospun fiber membrane, (3) putting the electrospun fiber membrane prepared in step (2) into a box-type muffle furnace, and sintering it at a constant temperature in an air atmosphere to obtain a three-dimensional interconnected anode active material, (4) weighing the anode active material prepared in step (3), dissolving the anode material, the conductive agent and the binder in solvent (II) in sequence, and stirring evenly at room temperature to form a viscous anode slurry, (5) uniformly scraping the anode slurry prepared in step (4) on the surface of the aluminum foil, and vacuum-drying to obtain an electrode coated with a porous anode framework, (6) weighing 10-16 %mass polymer monomer and 0.5-1 %mass initiator, dissolving the lithium salt and the initiator in the polymer monomer in turn, and stirring, forming polymer electrolyte precursor liquid after homogenization, (7) dripping the polymer electrolyte precursor solution prepared in step (6) on the surface of the electrode blank prepared in step (5), leaving still, heating the blank to polymerize and solidify to obtain a composite anode. The nitrate is the nitrate of the metal element in the anode active material. The anode active material is lithium cobalt oxide, lithium manganate, lithium iron phosphate or lithium nickel cobalt manganese oxide.