Preparation methods of three-dimensional LiMn2O4 thin film positive electrode and three-dimensional all-solid-state thin film lithium ion battery

Abstract

The invention discloses preparation methods of a three-dimensional LiMn2O4 thin film positive electrode and a three-dimensional all-solid-state thin film lithium ion battery. The preparation method of the three-dimensional LiMn2O4 thin film positive electrode comprises the following steps: using a LiMn2O4 material with excessive Li as a target, vacuumizing a chamber, heating a substrate, introducing argon and oxygen and regulating the pressures of the gases in the chamber; obtaining a three-dimensional LiMn2O4 thin film on the substrate; carrying out annealing treatment on the obtained three-dimensional LiMn2O4 thin film. The preparation method of the three-dimensional all-solid-state thin film lithium ion battery is characterized by plating the three-dimensional positive electrode thin film with a solid-state electrolyte thin film, a negative electrode thin film and a negative electrode current collector in sequence. The preparation methods have the beneficial effects that templates are unnecessary to be utilized to prepare the thin film positive electrode; a three-dimensional structure is directly obtained through DC power supply magnetron sputtering; the method is simple, is low in cost and easily achieves industrialization; the new electrode has the effects of increasing the specific surface area of the LiMn2O4 material, reducing the contact resistance and obtaining the high rate performance; the three-dimensional all-solid-state thin film battery prepared from the three-dimensional thin film electrode has excellent rate and cycling stability and has the effect of improving the power density while improving the energy density in unit area.

Description

technical field [0001] The invention relates to the technical field of an all-solid-state thin-film lithium-ion battery, in particular to a three-dimensional LiMn 2 o 4 A method for preparing a thin-film positive electrode and its application to a three-dimensional all-solid-state thin-film lithium-ion battery. Background technique [0002] In recent years, lithium-ion batteries have become the first choice for new green energy and portable electronic equipment batteries due to their advantages such as high capacity, high working voltage and no memory effect, and have achieved tremendous development in the field of power energy. However, the current commercial lithium-ion batteries have certain safety hazards due to the use of organic electrolytes that are flammable, explosive and volatile. Using solid electrolyte to replace organic liquid electrolyte and preparing all-solid-state thin-film lithium-ion batteries is the fundamental way to solve the current safety problems o...

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Problems solved by technology

Cathode material is the key factor affecting battery performance. The current preparation of cathode materials often requires high temperature treatment in order to obtain ideal crystal structure and crystallinity, but the three-dimensional nanostructure is difficult to maintain under high temperature conditions, and there may be high temperature between the substrate and the cathode material. Introduce impurities to affect its electrochemical performance (Functional Materials letters, 2014, 7, 1430003.)

In addition, it is also a new idea to prepare three-dimensional cathode materials by preparing a three-dimensional template on the substrate first and then depositing cathode materials on it. However, the process is complicated, and the deposition of cathode materials on the template surface is difficult. There are difficulties (Advanced Materials, 2010, 22, 4978-4981; Nano Letters, 2013, 13, 293-300.)

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