Production method of flexible integrated battery cell

Abstract

The invention relates to a production method of a flexible integrated battery cell, which comprises the following steps of uniformly mixing a polymer electrolyte, a lithium salt and a battery additive, applying the mixture between a flexible self-supporting positive electrode film and a flexible self-supporting negative electrode film, carrying out in-situ polymerization for 1-8 hours under the heating condition of 30-150 DEG C, and curing into a whole to obtain the flexible integrated battery cell. The battery cell is integrated without a diaphragm,therefore, the interface problem caused by falling of the active material from the current collector and dislocation of each component in the bending process of the battery is effectively avoided, the interface impedance is avoided, and the all-solid-state battery prepared from the all-solid-state battery cell also has relatively long service life and relatively high electrical performance, and has a wide application prospect in the fieldsof use and development of large-scale flexible lithium batteries, especially flexible electronic products and wearable equipment.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a production method of a flexible integrated battery cell. Background technique [0002] In recent years, with the rapid development of flexible / wearable devices in the fields of smart clothing, biomonitors, electronic paper, epidermal electronics, flexible displays, etc., power supplies compatible with wearable electronic products must be light in weight, It has the characteristics of small size, arbitrary deformation, simple and quick manufacturing process and low cost. [0003] Lithium-ion batteries have the advantages of high safety performance, high energy density, long cycle life, wide operating temperature range, wide electrochemical window, flexibility, and convenient recycling. The packaging of traditional lithium-ion batteries is stacked according to the positive electrode sheet, diaphragm, and negative electrode sheet, and is packaged in a metal shell or alu...

AI Technical Summary

Problems solved by technology

However, the components in such a battery core structure are only connected together through simple physical effects, so as the charge and discharge progress, and in the environment of external force bending, the mutual force between the components will be obvious. weaken

At the same time, the adhesion between the active material and the current collector cannot solve the problem of the two falling off during the bending process.

[0005] The Chinese invention patent with the application number CN201810495322.6 also discloses a method for preparing an integrated battery core, which effectively eliminates the interface separation caused by the charging and discharging process through the integrated polymerization of the solid electrolyte between the positive and negative electrodes. The technical problem of large impedance, but the adhesion of the positive and negative active materials on the current collector has not been well resolved. At the same time, the problem that the metal current collector is deformed and difficult to recover during the bending process still exists. Therefore, there are still more Big room for improvement

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