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All-solid-state lithium battery and preparation method thereof

A lithium battery, all-solid-state technology, applied in the field of all-solid-state lithium battery and its preparation, can solve the problems of increased difficulty in lithium ion deintercalation, failure to reduce interface resistance, failure to reduce residual alkali, etc., to improve cycle performance and rate performance , reduce the pH value and internal resistance of the battery, and improve the effect of the rate performance

Inactive Publication Date: 2018-09-14
武汉艾特米克超能新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because these coatings are not uniform, the coated oxides cannot reduce the interface resistance, and cannot reduce the residual alkali on the surface of the positive electrode material, so the pH is not greatly reduced; or the coating thickness is too high, resulting in lithium The difficulty of ion deintercalation increases, and the internal resistance of the battery increases

Method used

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  • All-solid-state lithium battery and preparation method thereof
  • All-solid-state lithium battery and preparation method thereof
  • All-solid-state lithium battery and preparation method thereof

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preparation example Construction

[0039] An embodiment of the present invention provides a method for preparing an all-solid lithium battery. The all-solid lithium battery includes a positive electrode, a negative electrode, and a solid electrolyte disposed between the positive electrode and the negative electrode. The positive electrode includes a positive electrode material. The preparation method includes Follow the steps below:

[0040] S1, forming a coating layer on the surface of the positive electrode material powder by atomic layer deposition, and the coating layer is any one of metal oxide, metal phosphate, metal fluoride or metal sulfide;

[0041] S2, sinter the positive electrode material powder with coating layer at 300-1000°C for 2-10h, and form LiX on the surface of the positive electrode material powder a Y b Solid electrolyte layer, that is, the surface is coated with LiX a Y bThe positive electrode material of the solid electrolyte layer; the sintering temperature should not exceed 1000°C. ...

Embodiment 1

[0064] 1) Put the LCO powder sample into a porous container;

[0065] 2) Put the porous container into the ALD reaction chamber, then repeatedly evacuate and replace nitrogen for at least three times;

[0066] 3) Fluidize the LCO powder sample in an atmosphere of nitrogen or argon or rotate the porous container to achieve the powder dispersion effect; wherein the fluidization pressure is 100torr;

[0067] 4) Vacuumize and heat the reaction chamber to bring the temperature to 400 Kelvin, keep the LCO powder sample at the set temperature for 25 minutes, and the air pressure in the reaction chamber is 10 mTorr;

[0068] 5) Open the air outlet valve, pulse the cleaning air, and clean for 15 seconds;

[0069] 6) Close the outlet valve, pulse gaseous trimethylaluminum for 0.01 second, and then keep it for 60 seconds;

[0070] 7) Then open the gas outlet valve, pulse sweeping gas argon, and sweep for 1 minute; close the gas outlet valve, vacuumize, and remove excess reaction by-pro...

Embodiment 2

[0077] 1) NMC powder sample is put into porous container;

[0078] 2) Put the porous container into the ALD reaction chamber, then repeatedly evacuate and replace nitrogen for at least three times;

[0079] 3) Fluidize the NMC powder sample under an atmosphere of nitrogen or argon or achieve the powder dispersion effect by rotating the porous container; wherein the fluidization pressure is 50torr;

[0080] 4) evacuate and heat the reaction chamber to bring the temperature to 450 Kelvin, keep the NMC powder sample at the set temperature for 5 minutes, and the air pressure in the reaction chamber is 10 millitorr;

[0081] 5) Open the air outlet valve, pulse sweeping gas nitrogen, and sweep for 3s;

[0082] 6) Close the outlet valve, pulse gaseous titanium chloride for 10 seconds, and then keep for a period of 1 second;

[0083] 7) Then open the air outlet valve, pulse sweeping gas nitrogen, and sweep for 0.1 minute; close the air outlet valve, vacuumize, and remove excess reac...

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Abstract

The invention belongs to the technical field of lithium batteries and particularly relates to a preparation method of an all-solid-state lithium battery, comprising the steps of S1, forming a coatinglayer on the surface of cathodic material powder by means of atomic layer deposition; S2, sintering the cathodic material powder of the coating layer at 300-1000 DEG C for 2-10 h, and forming LiXaYb solid-state electrolyte layer on the surface of the cathodic material powder; S3, preparing a cathode with a cathodic material surface-coated with the LiXaYb solid-state electrolyte layer, and assembling an anode, the solid-state electrolyte layer and the cathode into the all-solid-state lithium battery. The invention also provides an all-solid-state lithium battery prepared via the preparation method. The surface of the cathodic material is coated with metallic oxides, metallic phosphates, metallic fluorides or metallic sulfides via ALD (atomic layer deposition); after heating, reaction with the surface residue, alkaline matters, on the cathodic material occurs so as to form the LiXaYb solid-state electrolyte layer; therefore, PH value of the cathodic material is reduced, internal resistance of the solid-state battery is improved, and the cycle performance and rate performance of the battery are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to an all-solid lithium battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries are a rapidly growing application. It has important applications in many fields, including hybrid electric vehicles and plug-in electric vehicles. These cathode materials are usually composed of lithium-containing transition metal oxides or lithium-containing transition metal phosphate cathodes. [0003] Improving the ease of handling of cathode materials is a very troublesome thing. In general, the pH value of the electrode material will affect the surface chemical properties of most oxide cathodes, and requires high environmental control during the baking and coating process. Commercial positive electrode materials include lithium cobaltate, lithium cobalt manganese nickelate, and lithium nickel-cobalt aluminum; their pH value is generally ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/058
CPCH01M10/052H01M10/058Y02E60/10Y02P70/50
Inventor 解明熊红波
Owner 武汉艾特米克超能新材料科技有限公司
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