Lithium negative electrode or sodium negative electrode and preparation method and application of lithium negative electrode or sodium negative electrode

A lithium negative electrode and negative electrode technology, which is applied in the field of lithium/sodium batteries, can solve the problems of lithium battery and sodium battery capacity attenuation, cycle life, etc., to suppress the formation of sodium dendrites, promote uniform deposition, and reduce energy consumption Effect

Active Publication Date: 2019-12-31
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems that lithium dendrites in lithium batteries and sodium dendrites in sodium batteries lead to rapid capacity decay and cycle life of lithium batteries and sodium batteries, the present invention provides a method for preparing a lithium negative electrode or a sodium negative electrode and a lithium negative electrode or sodium negative electrode

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  • Lithium negative electrode or sodium negative electrode and preparation method and application of lithium negative electrode or sodium negative electrode
  • Lithium negative electrode or sodium negative electrode and preparation method and application of lithium negative electrode or sodium negative electrode
  • Lithium negative electrode or sodium negative electrode and preparation method and application of lithium negative electrode or sodium negative electrode

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preparation example Construction

[0034] The invention provides a preparation method of a lithium negative pole or a sodium negative pole. The preparation method of lithium negative pole or sodium negative pole mentioned here refers to the preparation method of lithium negative pole or the preparation method of sodium negative pole, because in the preparation method of lithium negative pole and sodium negative pole in the present invention, only the difference between lithium and sodium materials , and the rest of the preparation process is the same, so the two are put together for explanation.

[0035] The preparation method of the lithium negative pole or the sodium negative pole comprises the following steps:

[0036] An anti-perovskite solid electrolyte is provided, and then the anti-perovskite solid electrolyte is melted to obtain a molten anti-perovskite solid electrolyte, and the molten anti-perovskite solid electrolyte is coated on the surface of the current collector, thereby A layer of anti-perovski...

Embodiment 1

[0060] A preparation method of a lithium negative electrode and a lithium-sulfur battery.

[0061] Wherein the preparation method of lithium negative electrode comprises the following steps:

[0062] S11. In the glove box (control H 2 O≤20ppm, O 2 ≤200ppm), put 0.2mol LiOH (purity ≥99%, produced by alladin company) and 0.1mol LiCl (purity ≥99%, produced by alladin company) into a mortar for grinding and mixing, and then put it into an alumina crucible Heat to (345±15)°C and keep vacuuming for 24h, the reaction equation is LiCl+2LiOH=Li 3 OCl+H 2 O; Lithium ion conductivity can be obtained at 10 -3 ~10 -5 range of antiperovskite solid electrolyte Li 3 OCl.

[0063] For verification, Li 3 OCl, carry out XRD test to the substance that S11 obtains, the result is as follows figure 1 shown. From figure 1 It can be seen that the resulting reaction product is Li 3 OCl.

[0064] S12. the molten anti-perovskite solid electrolyte Li obtained in step S11 3 OCl is added dropw...

Embodiment 2

[0077] A preparation method of a lithium negative electrode and a lithium-sulfur battery.

[0078] Wherein the preparation method of lithium negative electrode comprises the following steps:

[0079] S21. In the glove box (control H 2 O≤20ppm, O 2 ≤200ppm), put 0.2mol LiOH (purity ≥99%, produced by aladdin company) and 0.1mol LiCl (purity ≥99%, produced by aladdin company) into a mortar for grinding and mixing, and then put it into an alumina crucible Heat to (345±15)°C and keep vacuuming for 24h, the reaction equation is LiCl+2LiOH=Li 3 OCl+H 2 O; Lithium ion conductivity can be obtained at 10 -3 ~10 -5 range of antiperovskite solid electrolyte Li 3 OCl.

[0080] S22. The antiperovskite solid electrolyte Li obtained by step S21 will be obtained 3 OCl is made into a dense ceramic sheet; using magnetron sputtering deposition method (sputtering power 200W, argon gas pressure 3m torr, argon flow rate 3sccn, sputtering time 20 minutes), the ceramic sheet is sputtered on th...

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Abstract

The invention relates to the technical field of lithium / sodium batteries and specifically provides a lithium negative electrode or sodium negative electrode and a preparation method and application ofthe lithium negative electrode or the sodium negative electrode. The preparation method comprises the following steps: melting an anti-perovskite solid electrolyte and coating the molten anti-perovskite solid electrolyte onto the surface of a current collector to form a layer of anti-perovskite solid electrolyte membrane on the surface of the current collector; and depositing lithium or sodium onthe surface of the current collector by adopting an electrochemical method to obtain the lithium negative electrode or the sodium negative electrode; or depositing the anti-perovskite solid electrolyte on the surface of a lithium metal sheet or a sodium metal sheet in a magnetron sputtering manner to obtain an anti-perovskite solid electrolyte membrane on the surface of the lithium / sodium metal sheet and obtaining the lithium negative electrode or the sodium negative electrode. The anti-perovskite solid electrolyte membrane is formed on the surface of the lithium negative electrode or the sodium negative electrode, and the anti-perovskite solid electrolyte membrane is used as an artificial solid electrolyte membrane, has high lithium ion or sodium ion conductivity, and inhibits the generation of lithium / sodium dendrites, so that the electrochemical performance of the lithium / sodium battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium / sodium batteries, and in particular relates to a lithium negative electrode or a sodium negative electrode and a preparation method and application of the lithium negative electrode or the sodium negative electrode. Background technique [0002] At present, the theoretical specific capacity of graphite anode materials used in commercial lithium batteries is only 372mAh / g, which is difficult to meet the application requirements of new high energy density lithium batteries. The specific capacity of metal lithium is 3860mAh·g -1 , reduction potential is -3.040V, density is 0.534g / cm 3 , At the same time, it is flexible, so it is considered to be a very competitive next-generation high-energy-density secondary battery anode material, known as the "holy grail" of lithium batteries. However, during the charging and discharging process of lithium metal negative electrode, lithium dendrites are very eas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M4/134H01M10/058H01M10/052H01M10/054H01M4/62H01M10/0562
CPCH01M4/134H01M4/1395H01M4/628H01M10/052H01M10/054H01M10/0562H01M10/058H01M2300/0071Y02E60/10Y02P70/50
Inventor 邓永红冯东宇韩兵
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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