Spray pyrolysis battery manufacturing method of double-layer film all-solid-state film lithium battery

Abstract

In a spray pyrolysis manufacturing method of an all-solid-state film lithium ion battery, a double-layer film structure is formed by depositing an anode material and a solid electrolyte together, and two layers of precursor solutions are sprayed simultaneously at a junction part of a anode solid electrolyte layer and a cathode layer by a double spray gun so as to form a buffer layer. The invention is characterized in that an interface layer between films is reduced; not only the battery resistance is reduced, but also the ionic conductivity of the anode material is increased; in the buffer layer between two deposition layers, the component contents of the two layers change gradually; the component content of the lower layer decreases gradually, and the component content of the upper layer increases gradually. Therefore, tight combination of the upper and the lower layers is formed; the compatibility of the upper and the lower layers is improved; the stress and crystal boundary are decreased; and the interfacial conductivity is increased; the conductivity of the whole all-solid-state film battery is greatly improved, and the stability and cycling performance of the battery are improved.

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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