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Lithium battery anode and preparation method thereof, and lithium battery

A lithium battery and negative electrode technology, which is applied in the lithium battery negative electrode and its preparation, and in the field of lithium batteries, can solve the problems of less reports on in-situ growth behavior, and achieve the effects of no pollution at the interface, elimination of growth, and high bonding strength

Active Publication Date: 2019-10-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition to the above-mentioned several commonly used methods, there are a series of methods such as three-dimensional current collectors, lithium surface modification, and solid-state electrolytes to inhibit the formation of dendrites in the industry, but there are few reports on how to induce the in-situ growth behavior of lithium.

Method used

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  • Lithium battery anode and preparation method thereof, and lithium battery
  • Lithium battery anode and preparation method thereof, and lithium battery
  • Lithium battery anode and preparation method thereof, and lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Preparation of negatively charged inorganic nanosheets:

[0035] S1, take 100 mg of commercial expanded vermiculite, after cleaning and drying, first reflux in 50 ml of saturated sodium chloride solution at 80 °C for 12 hours, then repeat centrifugation to collect the precipitate, and wash until there is no Cl- in the solution;

[0036] S2, put the precipitate of S1 in 2mol / L LiCl aqueous solution, reflux at 80°C for 12h, then repeat centrifugation to collect the precipitate and wash until there is no Cl- in the solution;

[0037] S3, put the precipitate of S2 in 50ml of 30wt.% hydrogen peroxide, reflux at 80°C for 12h, and finally ultrasonicate the solution for 12h, centrifuge at 5000r / min to get the supernatant, and then re-centrifuge the supernatant at 10000r / min Centrifuge at a rotating speed of 1.5 nm to obtain peeled vermiculite nanosheets with a thickness of 1.5 nm, freeze-dry and set aside.

[0038] Preparation of lithium battery negative electrode and lithium ...

Embodiment 2

[0043] Preparation of negatively charged inorganic nanosheets:

[0044] S1, take 100 mg of commercial expanded vermiculite, after cleaning and drying, first reflux in 50 ml of saturated sodium chloride solution at 80 °C for 12 hours, then repeat centrifugation to collect the precipitate, and wash until there is no Cl- in the solution;

[0045] S2, put the precipitate of S1 in 2mol / L LiCl aqueous solution, reflux at 80°C for 12h, then repeat centrifugation to collect the precipitate and wash until there is no Cl- in the solution;

[0046] S3, put the precipitate of S2 in 50ml of 30wt.% hydrogen peroxide, reflux at 80°C for 12h, and finally ultrasonicate the solution for 12h, centrifuge at 5000r / min to get the supernatant, and then re-centrifuge the supernatant at 10000r / min Centrifuge at a rotating speed of 1.5 nm to obtain peeled vermiculite nanosheets with a thickness of 1.5 nm, freeze-dry and set aside.

[0047] Preparation of lithium battery negative electrode and lithium ...

Embodiment 3

[0052] Preparation of negatively charged inorganic nanosheets:

[0053] S1, take 500 mg of bentonite, after cleaning and drying, first reflux in 100 ml of saturated sodium chloride solution at 70°C for 15 hours, then repeat centrifugation to collect the precipitate, and wash until there is no Cl- in the solution;

[0054] S2, put the precipitate of S1 in 3mol / L LiCl aqueous solution, reflux at 80°C for 12h, then repeat centrifugation to collect the precipitate, and wash until there is no Cl- in the solution;

[0055] S3, put the precipitate of S2 in 50ml of 30wt.% hydrogen peroxide, reflux at 70°C for 15h, and finally ultrasonicate the solution for 12h, centrifuge at 5000r / min to get the supernatant, and then re-centrifuge the supernatant at 10000r / min Centrifuge at a rotating speed of 4.5 nm to obtain bentonite nanosheets with a thickness of 4.5 nm, which are freeze-dried for subsequent use.

[0056] Preparation of lithium battery negative electrode and lithium battery:

[...

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Abstract

The invention belongs to the technical field of secondary batteries, and particularly relates to a lithium battery anode. The lithium battery anode comprises a lithium sheet and a composite material layer which is generated on the surface of the lithium sheet in situ and has a shell structure, wherein the composite material layer is obtained by co-deposition of an inorganic nano sheet with electronegativity and lithium ions in an electrolyte. The inorganic nano sheet with electronegativity adsorbs a large amount of lithium ions, and participates in deposition and induces lithium deposition inthe lithium ion reduction process along with lithium ion migration under the action of an electric field, so that the growth of lithium dendrites is eliminated. In addition, the invention also relatesto a preparation method of the lithium battery anode and a lithium battery containing the lithium battery anode.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a lithium battery negative electrode, a preparation method thereof, and a lithium battery. Background technique [0002] With the development of the global social economy and the depletion of traditional energy sources (coal, oil, natural gas, etc.), new energy storage technologies, especially lithium-ion secondary batteries, have developed rapidly due to their environmental friendliness and recyclability. Applied to every aspect of people's life. However, the current energy density of lithium-ion batteries has reached a bottleneck and cannot be further improved. Metal lithium due to its ultra-high theoretical capacity (3860mAh / g), lower density (0.534g / cm 3 ) and the lowest reduction potential (-3.04V) are considered the holy grail of lithium battery anodes. However, lithium metal batteries encounter serious problems in the actual application process, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/052
CPCH01M4/13H01M4/139H01M10/052H01M2004/027Y02E60/10
Inventor 罗加严马庆涛
Owner TIANJIN UNIV
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