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Lithium cobalt oxide composite film electrode and preparation method thereof

A composite film, lithium cobalt oxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as unfavorable electrode energy density, increase, and hinder lithium ion transportation, and achieve improved cycle stability, promote transportation, The effect of increased conductivity

Inactive Publication Date: 2019-11-12
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the Ag layer parallel to the electrode surface will hinder the transport of lithium ions to a certain extent, and Ag is a noble metal that is not conducive to the improvement of the electrode energy density.

Method used

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  • Lithium cobalt oxide composite film electrode and preparation method thereof
  • Lithium cobalt oxide composite film electrode and preparation method thereof
  • Lithium cobalt oxide composite film electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: a kind of lithium cobalt oxide composite film electrode and preparation method thereof, comprises the following steps:

[0034] (1) LiCoO 2 The target and the Al target are installed in the magnetron sputtering chamber, and the vacuum is continuously pumped. The clean stainless steel substrate is placed in the substrate holder and heated to 550°C and maintained. The substrate rotation speed is 10rpm;

[0035] (2) Vacuum to the bottom vacuum 6×10 -4 After Pa, after passing Ar gas, the sputtering pressure is 2.5Pa, and the co-sputtering of LiCoO 2 target and Al target, of which LiCoO 2Target parameters are: target base distance 5cm, sputtering power 160W, Al target parameters are: target base distance 6.5cm, sputtering power 20W;

[0036] (3) Cool naturally after sputtering to obtain a lithium cobalt oxide composite thin film electrode.

Embodiment 2

[0037] Embodiment 2: a kind of lithium cobalt oxide composite film electrode and preparation method thereof, comprises the following steps:

[0038] (1) LiCoO 2 The target and the Al target are installed in the magnetron sputtering chamber, and the vacuum is continuously pumped. The clean stainless steel substrate is placed in the substrate holder and heated to 550°C and maintained. The substrate rotation speed is 10rpm;

[0039] (2) Vacuum to the bottom vacuum 6×10 -4 After Pa, a mixed gas of argon and oxygen is introduced, wherein the volume ratio of argon and oxygen is 4:1, so that the sputtering pressure is adjusted to 2.5Pa, and the co-sputtering of LiCoO 2 target and Al target, of which LiCoO 2 Target parameters are: target base distance 5cm, sputtering power 160W, Al target parameters are: target base distance 6.5cm, sputtering power 20W;

[0040] (3) Cool naturally after sputtering to obtain a lithium cobalt oxide composite thin film electrode.

Embodiment 3

[0041] Embodiment 3: a kind of lithium cobalt oxide composite film electrode and preparation method thereof, comprises the following steps:

[0042] (1) LiCoO 2 The target and the Al target are installed in the magnetron sputtering chamber, and the vacuum is continuously pumped. The clean stainless steel substrate is placed in the substrate holder and heated to 500°C and maintained. The substrate rotation speed is 10rpm;

[0043] (2) Vacuum to the bottom vacuum of 7×10 -4 After Pa, after passing Ar gas, the sputtering pressure is 2.5Pa, and the co-sputtering of LiCoO 2 target and Al target, of which LiCoO 2 Target parameters are: target base distance 6cm, sputtering power 200W, Al target parameters are: target base distance 7cm, sputtering power 30W;

[0044] (3) Cool naturally after sputtering to obtain a lithium cobalt oxide composite thin film electrode.

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Abstract

The invention discloses a lithium cobalt oxide composite film electrode and a preparation method thereof. The aluminum-doped modified lithium cobalt oxide composite film electrode is prepared by simultaneously sputtering a lithium cobalt oxide target and an aluminum target through a multi-target co-sputtering technique, by adjusting sputtering parameters and target compositions of the lithium cobalt oxide target and the aluminum target, the composition and structure of the composite film are regulated, and thus the high-performance lithium cobalt oxide composite film electrode is prepared. Thelithium cobalt oxide composite film electrode and the preparation method thereof have the beneficial effects that the preparation process is simple and easy to control, metal aluminum forms a conductive network in a film, thus, the conductivity of the electrode is significantly improved, part of aluminum enters lithium cobalt oxide lattices during the co-sputtering process, a LiAlyCo1-yO2 solid solution is formed, on the one hand, transportation of lithium ions can be promoted through the solid solution, and on the other hand, the electrode cycle stability is improved through the solid solution.

Description

technical field [0001] The invention relates to a lithium cobalt oxide electrode, in particular to a lithium cobalt oxide composite film electrode and a preparation method thereof. Background technique [0002] All-solid-state thin-film lithium-ion batteries are considered to be one of the ideal power sources for microelectronic products due to their advantages such as high energy density, good safety performance, long cycle life, good structural designability and compatibility with microelectronic technology. Thin-film electrodes are the key factors that determine the energy density and cycle performance of all-solid-state thin-film lithium-ion batteries. Among the many cathode materials that have been developed, LiCoO 2 It is easy to prepare and form a film, and has a high open circuit voltage and specific capacity to ensure a high energy density of the thin film electrode. It is considered to be one of the ideal thin film cathodes. However, since there is no conductive ...

Claims

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Application Information

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IPC IPC(8): C23C14/06C23C14/08C23C14/35H01M4/525H01M10/0525
CPCC23C14/06C23C14/08C23C14/352H01M4/525H01M10/0525Y02E60/10
Inventor 戴新义唐乾昌吴复忠
Owner GUIZHOU UNIV
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