▎ 摘　　要

NOVELTY - Method for preparing a high-rate high energy density battery, involves (i) using nickel foam as current collector, using ceramic composite membrane as diaphragm, using a mixed solution containing lithium salt, organic solvent, film-forming agent and surfactant as electrolyte, using lithium-nickel-manganese oxide or lithium-manganese oxide as positive electrode active material, using a mixture of conductive carbon black, conductive graphite and carbon nanotubes as positive electrode conductive agent, using negative electrode graphite and silicon monoxide as negative electrode active material, and using a mixture of conductive carbon black and carbon nanotubes as negative electrode conductive agent, (ii) preparing positive electrode strip, (iii) preparing negative electrode strip material, (iv) preparing battery cells, (v) placing the cell in a casing, baking, injecting the electrolyte, and packaging, and (vi) performing formation, capacity separation, and aging of the battery cells. USE - The method is used for preparing high-rate high energy density battery in electric automobile, electric aircraft, robot and other emerging applications, lead-acid battery, nickel-cadmium battery and lithium ion battery. ADVANTAGE - The method is convenient to control, has low cost, excellent repeatability, improves load of electrode active material on the current collector, and improves performance of the battery. DETAILED DESCRIPTION - Method for preparing a high-rate high energy density battery, involves (i) using nickel foam as current collector, using ceramic composite membrane as diaphragm, using a mixed solution containing lithium salt, organic solvent, film-forming agent and surfactant as electrolyte, using lithium-nickel-manganese oxide LiNi0.5Mn1.5O4 or lithium-manganese oxide LiMn2O4 as positive electrode active material, using a mixture of conductive carbon black, conductive graphite and carbon nanotubes as positive electrode conductive agent, using negative electrode graphite and silicon monoxide as negative electrode active material, and using a mixture of conductive carbon black and carbon nanotubes as negative electrode conductive agent, (ii) preparing positive electrode strip by pre-pressing the current collector according to the sizing area and the non-sizing area, first coating the positive electrode slurry on the front and back sides of the sizing area, drying and rolling, increasing the temperature to 400-450℃ in an inert atmosphere, heat-preserving for 30-40 minutes, cooling to room temperature with the furnace, coating the positive electrode slurry on the front and back sides of the sizing area again, drying and rolling to obtain the positive electrode strip, where the positive electrode slurry is formed by dispersing positive electrode powder in N-methylpyrrolidone, the positive electrode powder comprises positive electrode active material, positive electrode conductive agent, positive electrode additive agent and positive electrode binder, in the positive electrode slurry coated for the first time, the positive electrode additive is tin metal powder, and the positive electrode binder is hydroxypropyl methylcellulose, and in the positive electrode slurry coated again, the positive electrode additive is graphene, and the positive electrode binder is polyvinylidene fluoride, (iii) preparing negative electrode strip material by pre-pressing the current collector according to the sizing area and the non-sizing area, and applying the negative electrode slurry to the front and back sides of the sizing area for the first time, drying and rolling, increasing the temperature to 400-450℃ in an inert atmosphere, heat-preserving for 20-40 minutes, cooling to room temperature with the furnace, coating the negative electrode slurry on the front and back sides of the sizing area again, drying and rolling to obtain the negative electrode strip, where the negative electrode slurry is formed by dispersing the negative electrode powder in the negative electrode solvent, the negative electrode powder comprises negative electrode active material, negative electrode conductive agent, negative electrode additive agent and negative electrode binder, in the negative electrode slurry coated for the first time, the negative electrode additive is tin metal powder, and the negative electrode binder is hydroxypropyl methylcellulose, and in the negative electrode slurry coated again, the negative electrode additive agent is graphene, and the negative electrode binder is hydroxypropyl methylcellulose and polyacrylic acid, (iv) preparing battery cells by cutting the positive electrode strip and the negative electrode strip into pieces, welding the tabs on the slurry-free area of the current collector, pasting the tabs with glue to obtain the positive electrode sheet and the negative electrode sheet, and laminating the positive electrode sheet, separator and negative electrode sheet are laminated in Z shape to make a cell, (v) placing the cell in a casing, and baking in vacuum at 80-85℃ for 1-2 hours, injecting the electrolyte, leaving still, and packaging under vacuum conditions to form a battery cell, and (vi) performing formation, capacity separation, and aging of the battery cells to obtain a lithium-ion battery with high-rate and high energy density.