Mist pyrolysis preparation method of all-solid-state film lithium battery

Abstract

The invention discloses a mist pyrolysis preparation method of an all-solid-state film lithium battery. According to the invention, double spray guns are adopted to spray precursor solution of two layers at boundaries of electrode film layers simultaneously. A flow rate of the precursor solution at a lower layer is gradually reduced, and the flow rate of the precursor solution at an upper layer is gradually increased, and a buffering layer is formed between two settled layers. The contents of the components of the two layers in the buffering layer are morphing. The content of the components of the lower layer is gradually reduced, and the content of the components of the upper layer is gradually increased. The method is advantaged in that: with the method, the upper layer and the lower layer are compactly combined, the coupling between the two layers is increased, stress force and grain boundary are reduced, conductivities of the interfaces are increased, the influence of interface conductivities on the integral performance of the battery is reduced as far as possible, and the performance of the battery is improved.

Description

technical field [0001] The invention relates to a preparation method of a lithium battery, in particular to a spray pyrolysis preparation method of an all-solid thin film lithium battery. Background technique [0002] The all-solid-state lithium-ion battery composed of inorganic solid electrolyte has the following advantages: it has higher specific energy than traditional nickel-cadmium and nickel-hydrogen batteries; the shape design of the battery is also more convenient and flexible, and can be prepared into almost any shape and size , can be directly integrated in the circuit; it has excellent charge-discharge cycle performance, low self-discharge rate, and can overcome the problem of gradual failure of the liquid electrolyte lithium-ion battery due to the dissolution of the electrode active material in the electrolyte after a period of use [Z. R. Zhang, Z. L. Gong, and Y. Yang, J. Phys. Chem. B, 108, 2004, 17546.]; high safety, no gas generated during work, no leakage of...

AI Technical Summary

Problems solved by technology

In spray pyrolysis, the substrate temperature is usually not high and the kinetic energy brought by the carrier gas to the particles is limited (much less than magnetron sputtering or pulsed laser), resulting in a low degree of tightness and matching of the interface between layers, so the grain boundary resistance of the interface Higher, will seriously affect the overall performance of the battery

[0008]2. There are few solid electrolyte materials suitable for spray pyrolysis preparation. At present, the solid electrolyte LiPON (nitrogen-doped lithium phosphate) with good performance can only be produced by magnetron sputtering preparation

[0009]3. There are many process parameters that can be adjusted, such as carrier gas flow rate, material flow rate, substrate temperature, distance between nozzle and substrate, etc., optimization of process conditions more difficult

[0010] At present, research and development personnel have made some explorations on the preparation of all-solid-state thin-film batteries by spray pyrolysis, such as the Chinese invention patent with application number 200910044488.7, such as the literature [P. FRAGNAND, R NAGARAJAN., D. VUJIC, J. Power Sources, 1995, 54: 362.], basically the positive or negative electrode or electrolyte sheet of the whole film battery prepared by the traditional spray pyrolysis method, and it is difficult to overcome the electrode The interface conduction between the sheet and the electrolyte sheet is difficult, which affects the overall performance of the battery

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