A kind of double-layer film all-solid-state film lithium battery spray pyrolysis battery manufacturing method

Abstract

An all-solid-state lithium thin film that deposits the positive electrode material and the solid electrolyte together to form a double-layer film structure and uses a double spray gun to simultaneously spray the precursor solution of the two layers at the junction of the positive electrode solid electrolyte layer and the negative electrode layer to form a buffer layer. Ion battery spray pyrolysis manufacturing method. It is characterized in that the interface between one layer of film is reduced, the battery resistance is reduced and the ionic conductivity of the positive electrode material is improved at the same time; at the same time, the content of the two layers of components in the buffer layer between the two deposition layers is gradually changing, and the composition of the lower layer The content of the component gradually decreases, while the content of the upper component gradually increases. Thus forming a tight combination of the upper and lower layers, increasing the matching of the upper and lower layers, reducing stress and grain boundaries, and improving the conductance of the interface; thus greatly improving the conductance of the entire all-solid-state thin film battery, improving the stability and cycle performance of the battery.

Description

technical field [0001] The invention relates to the field of manufacturing all-solid-state lithium-ion batteries. 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 electrolyte; stable performance, wide operating temperature range ( -50~180℃), c...

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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

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