A water-soluble power lithium-ion battery

Abstract

The invention belongs to the technical field of lithium-ion batteries, and specifically relates to a water-soluble power lithium-ion battery, which includes a positive electrode sheet, and the positive electrode sheet includes a positive electrode current collector and a positive electrode slurry, and the positive electrode slurry includes a conductive agent, a water-based binder and a Ionized water, the positive current collector is oily carbon-coated aluminum foil; the conductive agent includes water-based conductive paste and carbon black, and the water-based binder includes water-based binder A, water-based binder B and binder C. The invention improves the dispersibility and stability of the positive electrode slurry, improves the bonding performance of the positive electrode sheet and the flexibility of the positive electrode sheet, and increases the compaction density to increase the energy density, and the better flexibility of the electrode sheet can improve the roll pressure. , laser cutting, winding and hot pressing yield and production efficiency; solves the problem of scratches, leaking foil and pole piece cracking caused by rapid slurry drying, and the oily carbon-coated aluminum foil reduces the internal resistance of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a water-soluble power lithium ion battery. Background technique [0002] Compared with lead-acid batteries, nickel-metal hydride batteries, and nickel-cadmium batteries, lithium-ion batteries have the advantages of higher energy density, low self-discharge, and long cycle life. They have been widely used in consumer electronics and power batteries. Currently, fluorine-containing polymers such as polyvinylidene fluoride are generally used as a binder and NMP (N-methylpyrrolidone) as a solvent for the positive electrode slurry of lithium ion batteries. Since organic solvents are easy to cause environmental pollution and harm the health of operators, it is necessary to increase the cost to recover the organic solvents during the coating and drying process. At the same time, the cost of NMP is high, which increases the production cost of batteries. Therefor...

AI Technical Summary

Problems solved by technology

[0004] (1) Deionized water is used as the solvent, the dispersion of the positive electrode is difficult, the slurry is difficult to disperse, and the stability is poor;

[0005] (2) When coating, on the one hand, the slurry dries quickly, causing scratches and leakage of foil; on the other hand, cracking and powder dropping can be slightly improved by increasing the amount of binder and reducing the density of the coating surface, but Reduced energy density;

[0006] (3) The pole piece is brittle when rolling, although the flexibility of the pole piece can be slightly improved by reducing the compaction density, but the energy density is also reduced;

[0007] (4) The lamination process is adopted, and the production efficiency is low

Images