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

A lithium-ion battery and positive electrode technology, which is applied in the field of all-solid-state thin-film lithium-ion batteries, can solve the problems of morphology control and mass production, difficulty in maintaining three-dimensional nanostructures, difficulty in uniform deposition of positive electrode materials, etc., and achieve excellent rate performance And cycle stability, increase the electrochemical reaction area, improve the effect of electrochemical performance

Active Publication Date: 2016-12-07
THE NORTHERN RES INST OF NJUST
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  • Application Information

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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 performan

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

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Embodiment 1

[0029] Embodiment 1: Three-dimensional LiMn 2 o 4 A method for preparing a thin film positive electrode, comprising

[0030] (1) LiMn with excess Li 2 o 4 The material is used as the target material, the stainless steel foil coated with metal layer is used as the substrate, and the magnetron sputtering vacuum chamber is evacuated to 6×10 -5 Pa, heat the substrate to 300°C, feed 36sccm argon and 4sccm oxygen, and adjust the gas pressure in the chamber to 1Pa;

[0031] (2) Set the DC sputtering power to 4.3W / cm 2 , the target base distance is 80mm, and the pre-sputtering is 10min to clean the impurities on the target surface. The sputtering time is 3h, and the three-dimensional LiMn can be directly obtained on the substrate. 2 o 4 film.

[0032] (3) The three-dimensional LiMn obtained above 2 o 4 Thin film annealing treatment, annealing temperature 700°C, annealing time 2h.

[0033] figure 1 It is a three-dimensional LiMn sputtered directly at 300 °C 2 o 4 SEM image...

Embodiment 2

[0041] This embodiment provides a LiMn for three-dimensional all-solid-state ion battery 2 o 4 The anode material is obtained by directly sputtering with a DC power source to obtain a three-dimensional anode film with a thickness of 1.3 μm.

[0042] Preparation method: (1) LiMn with excess Li 2 o 4 The material is used as the target, the stainless steel foil coated with gold layer is used as the substrate, and the magnetron sputtering vacuum chamber is evacuated to 6×10 -5 Pa, heat the substrate to 300°C, feed 36sccm argon and 4sccm oxygen, and adjust the gas pressure in the chamber to 1Pa;

[0043] (2) Set the DC sputtering power to 4.3W / cm 2 , the target base distance is 80mm, and the pre-sputtering is 10 minutes to clean the impurities on the target surface. The sputtering time is 3h, and the three-dimensional LiMn can be directly obtained on the substrate. 2 o 4 film;

[0044] (3) The three-dimensional LiMn obtained above 2 o 4 Thin film annealing treatment, annea...

Embodiment 3

[0049] This embodiment provides a LiMn for three-dimensional all-solid-state ion battery 2 o 4 The anode material is obtained by directly sputtering with a DC power source to obtain a three-dimensional anode film with a thickness of 1.3 μm.

[0050] Preparation method: (1) LiMn with excess Li 2 o 4 The material is used as the target, the stainless steel foil coated with gold layer is used as the substrate, and the magnetron sputtering vacuum chamber is evacuated to 6×10 -5 Pa, heat the substrate to 300°C, feed 36sccm argon and 4sccm oxygen, and adjust the gas pressure in the chamber to 1Pa;

[0051] (2) Set the DC sputtering power to 4.3W / cm 2 , target base distance 80mm, pre-sputtering for 10 minutes to clean the impurities on the target surface, sputtering time is 2h, then adjust the temperature to 600°C, sputtering time 1h, other conditions remain unchanged, can be obtained directly on the substrate 3D LiMn 2 o 4 film.

[0052] (3) The three-dimensional LiMn obtaine...

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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...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/04H01M4/505H01M10/0525H01M10/058C23C14/35C23C14/58
CPCC23C14/35C23C14/5806H01M4/0426H01M4/1391H01M4/505H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 夏晖孙硕夏求应昝峰徐璟岳继礼
Owner THE NORTHERN RES INST OF NJUST
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