LiV3O8/Li:BPO4|Al<3+> doped Li7La3Zr2o12/Li4Ti5O12 all-solid-state thin film battery and preparation method

Abstract

The invention relates to a LiV3O8 / Li:BPO4|Al<3+> doped Li7La3Zr2o12 / Li4Ti5O12 all-solid-state thin film battery and a preparation method. The preparation method is characterized in that a positive active material precursor and a negative active material precursor are pyrolyzed by virtue of a liquid spray gun in an electrostatic spraying manner, electrolyte material layers are sprayed by virtue of a hypersonic flame layer by layer to form a thin film all-solid-state lithium ion battery LiV3O8 / Li:BPO4|Al<3+> doped Li7La3Zr2O12 / Li4Ti5O12; a voltage between a substrate and the spray gun reaches up to 40 to 80 kV, so that the close contact between an anode material and a current collector and between a cathode material and electrolyte can be greatly improved; the movement velocity of hypersonic flame spraying particles is high, and the particles can be closely contacted with the substrate at a semi-molten state; meanwhile, second solid electrolyte LI: BPO4 is introduced in the Al<3+> doped Li7La3Zr2O12 solid electrolyte, so that the interface and crystal boundary impedance can be further reduced, and 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; at the same time, the grain boundary conductivity of the solid electrolyte layer body is very low, which is also an important factor affecting the all-solid-state 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, R NAGARAJAN., D.VUJIC, J.Power Sources, 1995, 54:362.], basically the positive or negative electrode sheet or the electrolyte sheet of the overall thin film battery prepared by the traditional spray pyrolysis method, and it is difficult to overcome the interfacial conductivity between the electrode sheet and the electrolyte sheet, which affects the battery. overall performance

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