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Composite coating, preparation method and application thereof, composite lithium negative electrode and preparation method of negative electrode

A technology of composite coating and lithium negative electrode, which is applied in the fields of preparation, composite coating, composite lithium negative electrode and preparation, can solve the problems of loose contact between electrolyte membrane and lithium metal surface, increase of battery quality, increase of interface impedance, etc., and achieve excellent Effects of ionic conductivity, high mechanical strength, and excellent deformability

Active Publication Date: 2021-06-15
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such a design will not only increase the interfacial impedance due to the loose contact between the electrolyte membrane and the lithium metal surface, but also increase the battery mass and reduce the energy density.

Method used

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  • Composite coating, preparation method and application thereof, composite lithium negative electrode and preparation method of negative electrode
  • Composite coating, preparation method and application thereof, composite lithium negative electrode and preparation method of negative electrode
  • Composite coating, preparation method and application thereof, composite lithium negative electrode and preparation method of negative electrode

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preparation example Construction

[0030] A kind of preparation method of composite coating of the present invention specifically comprises the following steps:

[0031] Step S1, after ball milling the cubic phase LLXO powder, according to the ratio of 1g: 0.1ml ~ 1ml, the ball milled cubic phase LLXO powder and both -C=C- and -Si-O-CH 3 -The polymer with functional group is added to the organic solvent, heated at 100°C-150°C after ultrasonication, reacted for 1h-5h under stirring conditions, centrifuged, washed several times, and dried to obtain LLXO-Si powder. The choice of organic solvent is to be able to dissolve and disperse the above-mentioned substances and not participate in the reaction. The minimum amount of solvent is to ensure that LLXO powder and polymer can be fully dispersed.

[0032] In this step, the LLXO powder is an inorganic solid electrolyte selected from Li 3x La 2 / 3-x TiO 3 , Li 5 La 3 m 2 o 12 , Li 6 ALa 2 m 2 o 12 , Li 7 La 3 Q 2 o 12 , (C=Zr, Sn) or Li 7 La 3 Ta 2 o 13...

Embodiment 1

[0047] A composite coating for the negative electrode of a lithium battery, prepared by the following preparation method: 0.5309g lithium nitrate, 1.299g lanthanum nitrate, 0.09g aluminum nitrate, 0.8544g zirconium acetylacetonate, 0.0675g niobium chloride, 1.4976g lemon Add acid, 0.48413g ethylene glycol, into 60ml deionized water and 20ml ethanol, stir at 80°C for 12h until the solution is clear and viscous, put it into an oven, set the temperature at 90°C, and hold for 12h. Adjust the setting temperature of the oven to 250°C, and the holding time to 3h. Put it into a tube furnace after grinding, the heating rate is 10°C / min, the target temperature is 850°C, and the holding time is 2h to obtain LLXO powder. The structural formula of the LLXO powder is Li 6.03 La 3 Zr 1.75 Nb 0.25 Al 0.24 o 12 . Carry out X-ray diffraction (XRD) detection to this powder, detection result sees figure 1 .

[0048] figure 1 It is the XRD pattern of cubic phase LLXO powder and JCPDS (#80...

Embodiment 2

[0061] A composite coating for the negative electrode of a lithium battery, prepared by the following preparation method: 0.5309g lithium nitrate, 1.299g lanthanum nitrate, 0.09g aluminum nitrate, 0.8544g zirconium acetylacetonate, 0.0675g niobium chloride, 1.4976g lemon Add acid, 0.48413g ethylene glycol, into 60ml deionized water and 20ml ethanol, stir at 80°C for 12h until the solution is clear and viscous, put it into an oven, set the temperature at 90°C, and hold for 12h. Adjust the setting temperature of the oven to 250°C, and the holding time to 3h. Put it into a tube furnace after grinding, the heating rate is 10°C / min, the target temperature is 850°C, and the holding time is 2h to obtain LLXO powder. The structural formula of the LLXO powder is Li 6.03 La 3 Zr 1.75 Nb 0.25 Al 0.24 o 12 .

[0062] The prepared LLXO powder was ball milled at a rotational speed of 200r / min for 8 hours, and the direction was changed every 30 minutes. Add 0.6 g of ball-milled cubic ...

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Abstract

The invention belongs to the technical field of lithium metal secondary batteries, and provides a composite coating, a preparation method and application thereof, a composite lithium negative electrode and a preparation method of the negative electrode. Cubic phase LLXO powder is subjected to ball milling, the ball-milled cubic phase LLXO powder and a macromolecule with -C=C- and -Si-O-CH3-functional groups at the same time are added into an organic solvent according to the proportion of 1g: (0.1-1) ml, heating is performed for reaction, and separation and drying are carried out to obtain LLXO-Si powder; the LLXO-Si powder and a conductive polymer containing a -C=C- functional group are dispersed into an organic solvent according to a mass ratio of (2-6): (4-8) under a dark condition to obtain a uniformly dispersed turbid liquid; and the turbid liquid is spread on a smooth substrate, and is irradiated with natural light or ultraviolet light to cur the turbid liquid to obtain the composite coating. The composite coating can be applied to the surface of a lithium negative electrode matched with any positive electrode such as a ternary material and sulfur, the growth of lithium dendrites is avoided, and the generation of dead lithium is reduced, so that the cycling stability and the safety performance of the battery are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium metal secondary batteries, and in particular relates to a composite coating, a preparation method, an application, a composite lithium negative electrode and a preparation method. Background technique [0002] With the ever-increasing demand for energy density in electronics, electric vehicles and smart grids, lithium-ion batteries are currently only close to 300Wh kg -1 The upper limit of energy density can no longer keep up with the trend of rapid development, and it has become a top priority to explore advanced energy storage systems with ultra-high energy density. The lithium metal anode has a very high theoretical specific capacity (3860mAh g -1 ) and the lowest electrochemical potential (-3.040V vs standard hydrogen electrode), if mixed with sulfur (S) or oxygen (O 2 ) positive electrode matching, it is expected to be able to provide five times or even more energy density than conventional...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/134H01M4/1395H01M10/052H01M10/42
CPCH01M10/4235H01M4/0416H01M4/0433H01M4/134H01M4/0404H01M4/1395H01M10/052Y02E60/10
Inventor 肖强凤倪洁
Owner TONGJI UNIV
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