LiMn2O4/Al<3+> doped Li7La3Zr2O12/Li4TiO5O12 all-solid-state thin film battery and preparation method

Abstract

The invention relates to a LiMn2O4 / Al<3+> doped Li7La3Zr2O12 / Li4TiO5O12 all-solid-state thin film battery and a preparation method. The method is characterized in that a positive active material precursor and a negative active material precursor are pyrolyzed by virtue of a high-pressure electrostatic liquid spraying gun in an atomizing manner, and electrolyte material layers are sprayed by virtue of hypersonic flame layer by layer to form the thin film all-solid-state lithium ion battery LiMn2O4 / Al<3+> doped Li7La3Zr2O12 / Li4Ti5O12. The movement velocity of the hypersonic flame spraying particles is high, and the particles can be closely contacted with a substrate in a semi-molten state, so that the interface impedance between an anode material layer and solid electrolyte layer and between the solid electrolyte layer and a cathode material layer can be greatly reduced; underburning or overburning caused by inconsistent synthesis temperature of the electrolyte material and the anode and cathode materials can be avoided, so that the comprehensive electrochemical performance of the all-solid-state battery can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of a high-performance all-solid-state thin-film battery manufacturing method. Background technique [0002] Lithium-ion batteries have absolute advantages such as high volume, high weight-to-energy ratio, high voltage, low self-discharge rate, no memory effect, long cycle life, and high power density. They have an annual share of more than 30 billion US dollars in the global mobile power market and far exceed other The market share of batteries is the most promising chemical power source [Wu Yuping, Wan Chunrong, Jiang Changyin, Lithium-ion Secondary Batteries, Beijing: Chemical Industry Press, 2002.]. At present, most of the lithium-ion secondary batteries at home and abroad use liquid electrolytes. Liquid lithium-ion batteries have some disadvantages, such as: liquid organic electrolytes may leak, and may explode at too high a temperature, causing safety accidents, and cannot be used in some applications. ...

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. The thin film battery formed after spraying is only the precursor of the material. The positive electrode material, negative electrode material and electrolyte layer need subsequent heat treatment to form their own phases. However, the synthesis temperature of these materials is often inconsistent, so it is easy to cause the precursor Interaction between components and overburning of some components or underburning of some components

[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 the application number 200910044488.7, such as the literature [P.FRAGNAND, RNAGARAJAN., D.VUJIC, J.Power Sources, 1995, 54 : 362.], basically still use the traditional spray pyrolysis method to prepare the positive electrode or negative electrode sheet or electrolyte sheet of the whole thin film battery, and it is difficult to overcome the interfacial conduction difficulty between the electrode sheet and the electrolyte sheet, which affects the battery as a whole performance

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