A five-element high-entropy oxide nanofilm for lithium-ion batteries and its preparation and application

A lithium-ion battery and nano-film technology, which is applied to the five-element high-entropy oxide nano-film of lithium-ion batteries and its preparation and application fields, can solve the problems of low charge-discharge specific capacity, volume expansion, poor cycle stability and the like

Active Publication Date: 2021-04-09
INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the shortcomings of traditional unit metal oxide anode materials such as low charge-discharge specific capacity, poor cycle stability, and volume expansion during lithium intercalation and delithiation, the present invention designed and synthesized a five-element high-entropy oxide, and adopted laser molecular beam epitaxy deposition technology Nanoscale high-entropy oxide thin films were prepared

Method used

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  • A five-element high-entropy oxide nanofilm for lithium-ion batteries and its preparation and application
  • A five-element high-entropy oxide nanofilm for lithium-ion batteries and its preparation and application
  • A five-element high-entropy oxide nanofilm for lithium-ion batteries and its preparation and application

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Embodiment 1

[0028] Adopt laser molecular beam epitaxy deposition technology to prepare high-entropy oxide (Mg 0.2 co 0.2 Ni 0.2 Cu 0.2 Zn 0.2 )O thin film: According to the molar ratio (0.2 / 0.2 / 0.2 / 0.2 / 0.2), magnesium oxide, cobalt oxide, nickel oxide, copper oxide and zinc oxide are high-energy ball milled for 10-15 hours, mixed evenly and pressed into tablets to make laser molecules The target used for beam epitaxy deposition, the 1064nm fundamental frequency generated by the neodymium-doped yttrium aluminum garnet laser is tripled to obtain a 355nm pulsed laser, the laser beam is incident on the above target after being focused by the lens, the target and the substrate The distance is 30mm, high vacuum (1.0×10 -6 (Mg 0.2 co 0.2 Ni 0.2 Cu 0.2 Zn 0.2 )O thin film, in which the substrate is made of high-purity platinum, and the substrate temperature is 700°C.

[0029] The deposition time of the film is determined by the film thickness requirements, generally 1 to 2 hours. The t...

Embodiment 2

[0033] The high-entropy oxide (MgO) as the negative electrode material for lithium ion battery according to the present invention is prepared by laser molecular beam epitaxy deposition technology 0.25 Co 0.15 Ni 0.2 Cu 0.2 Zn 0.2 )O thin film: According to the molar ratio (0.25 / 0.15 / 0.2 / 0.2 / 0.2), high-energy ball milling of magnesium oxide, cobalt oxide, nickel oxide, copper oxide and zinc oxide for 10-15 hours, mixed evenly, and pressed into sheets to make laser molecules The target used for beam epitaxy deposition, the 1064nm fundamental frequency generated by the neodymium-doped yttrium aluminum garnet laser is tripled to obtain a 355nm pulsed laser, the laser beam is focused by a lens and then incident on the above target, the distance between the target and the substrate 20mm, 1.0×10 in high vacuum -6 (Mg) deposited on the substrate under Pa 0.25 Co 0.15 Ni 0.2 Cu 0.2 Zn 0.2 )O film, wherein the substrate is made of stainless steel, and the substrate temperature ...

Embodiment 3

[0038] The high-entropy oxide (MgO) as the negative electrode material for lithium ion battery according to the present invention is prepared by laser molecular beam epitaxy deposition technology 0.2 Co 0.2 Ni 0.3 Cu 0.15 Zn 0.15 )O thin film: According to the molar ratio (0.2 / 0.2 / 0.3 / 0.15 / 0.15), high-energy ball milling of magnesium oxide, cobalt oxide, nickel oxide, copper oxide and zinc oxide for 10-15 hours, mixed evenly, and pressed into sheets to make laser molecules The target used for beam epitaxy deposition, the 1064nm fundamental frequency generated by the neodymium-doped yttrium-aluminum garnet laser is tripled to obtain a 355nm pulsed laser, and the laser beam is focused by a lens and incident on the above target. The distance is 40mm, and the high vacuum degree is 1.0×10 -6 (Mg) deposited on the substrate under Pa 0.2 Co 0.2 Ni 0.3 Cu 0.15 Zn 0.15 )O thin film, wherein the substrate is a gold-coated monocrystalline silicon wafer, and the substrate tempera...

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Abstract

The invention discloses a five-element high-entropy oxide nano-film for lithium ion batteries and its preparation and application. The used initial raw materials include magnesium oxide, cobalt oxide, nickel oxide, copper oxide and zinc oxide, wherein the molar ratio of magnesium oxide, cobalt oxide, nickel oxide, copper oxide and zinc oxide is: 2~2.5:1.5~2:2~3 :1.5~2:1.5~2. First, the above oxides are ball-milled and uniformly mixed to make a target material for laser molecular beam epitaxy deposition. The pulsed laser generated by the laser is focused by a lens and incident on the target material, and the five-element high-entropy oxide is deposited by deposition. film. The nanometer five-element high-entropy oxide film prepared by the invention is used for the negative electrode material of lithium ion battery, and has excellent cycle characteristics and good stability. The preparation method has the characteristics of simple process, low cost and no pollution.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries in electrochemistry, and relates to a negative electrode material for lithium ion batteries, in particular to a lithium ion battery five-element high-entropy oxide nano film and its preparation and application. Background technique [0002] Lithium-ion batteries are currently widely used in people's work and life, such as portable electronic products such as mobile phones, digital cameras and notebook computers, electric vehicles, and large-scale energy storage equipment. An important factor affecting the performance of lithium-ion batteries is their electrode materials. At present, the negative electrode materials of commercial lithium-ion batteries generally use graphite. The structure of graphite is stable, and it has a stable reversible capacity in the charge-discharge cycle. However, the theoretical specific capacity of the graphite anode material is only 372mAh / g, which is difficul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/525Y02E60/10
Inventor 崔艳华陈鸿汪渊赵宇崔益秀张小强胡守亮魏华陈勇
Owner INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS
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