MXene aerogel lithium negative electrode current collector capable of rapidly charging and discharging at high rate, preparation method thereof and application thereof

An airgel lithium and current collector technology, applied in the direction of electrode carrier/collector, negative electrode, electrical components, etc., can solve the problem of increasing metal lithium and electrolyte consumption, unstable solid electrolyte interface film, and limiting the operation of metal lithium batteries and other problems, to achieve a good electronic conductive network, reduce the local current density, and the method is simple and feasible.

Inactive Publication Date: 2019-08-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are still many serious problems in the practical application of lithium metal.
First of all, metal lithium will produce dendritic lithium dendrites during the cycle, and the dendrites will pierce the separator, which will cause short circuit or even explosion of the battery, causing safety problems; In addition, metal lithium reacts with the electrolyte to form an unstable solid electrolyte interfacial film (SEI). The continuous destruction and repair of SEI will increase the consumption of metal lithium and electrolyte, resulting in a continuous decrease in battery efficiency.
These problems will be more serious under the condition of high current density, which limits the operation of lithium metal batteries under the condition of high rate and fast charge and discharge.

Method used

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  • MXene aerogel lithium negative electrode current collector capable of rapidly charging and discharging at high rate, preparation method thereof and application thereof
  • MXene aerogel lithium negative electrode current collector capable of rapidly charging and discharging at high rate, preparation method thereof and application thereof
  • MXene aerogel lithium negative electrode current collector capable of rapidly charging and discharging at high rate, preparation method thereof and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Etching carbon-aluminum-titanium with hydrochloric acid and lithium fluoride, combined with ultrasonic-assisted stripping method to prepare MXene dispersion, the concentration of which is 0.1mg / mL;

[0023] 2) Prepare the graphene oxide dispersion with a concentration of 0.2 mg / mL, and uniformly mix the MXene dispersion and the graphene oxide dispersion in step 1) according to the mass ratio of MXene:rGO=0.7, and add excess hydrogen iodide for reduction agent to obtain a mixed dispersion;

[0024] 3) Transfer the mixed dispersion liquid in the above step 2) to a 100mL hydrothermal kettle, seal it and transfer it to an oven at 80°C for 6h at low temperature to obtain MXene hydrogel;

[0025] 4) Immerse the MXene hydrogel in the above step 3) in the ethanol solution, fully soak for 72 hours to remove the iodine element attached to the surface, and rinse with water until the pH of the cleaning solution is 7;

[0026] 5) The cleaned MXene hydrogel was dried in an oven a...

Embodiment 2

[0028] 1) Etching carbon-aluminum-titanium with hydrochloric acid and lithium fluoride, combined with ultrasonic-assisted stripping method to prepare MXene dispersion, the concentration of which is 1.0 mg / mL;

[0029] 2) Prepare the graphene oxide dispersion with a concentration of 0.2 mg / mL, and uniformly mix the MXene dispersion and the graphene oxide dispersion in step 1) according to the mass ratio of MXene:rGO=0.7, and add excess hydrogen iodide for reduction agent to obtain a mixed dispersion;

[0030] 3) Transfer the mixed dispersion liquid in the above step 2) to a 100mL hydrothermal kettle, seal it and transfer it to an oven at 80°C for 6h at low temperature to obtain MXene hydrogel;

[0031] 4) Immerse the MXene hydrogel in the above step 3) in the ethanol solution, fully soak for 72 hours to remove the iodine element attached to the surface, and rinse with water until the pH of the cleaning solution is 7;

[0032] 5) The cleaned MXene hydrogel was dried in an oven ...

Embodiment 3

[0034] 1) Etching carbon-aluminum-titanium with hydrochloric acid and lithium fluoride, combined with ultrasonic-assisted stripping method to prepare MXene dispersion with a concentration of 2 mg / mL;

[0035] 2) Prepare the graphene oxide dispersion with a concentration of 0.2 mg / mL, and uniformly mix the MXene dispersion and the graphene oxide dispersion in step 1) according to the mass ratio of MXene:rGO=0.7, and add excess hydrogen iodide for reduction agent to obtain a mixed dispersion;

[0036] 3) Transfer the mixed dispersion liquid in the above step 2) to a 100mL hydrothermal kettle, seal it and transfer it to an oven at 80°C for 6h at low temperature to obtain MXene hydrogel;

[0037] 4) Immerse the MXene hydrogel in the above step 3) in the ethanol solution, fully soak for 72 hours to remove the iodine element attached to the surface, and rinse with water until the pH of the cleaning solution is 7;

[0038] 5) The cleaned MXene hydrogel was dried in an oven at 80°C f...

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Abstract

The invention discloses a MXene aerogel lithium negative electrode current collector capable of rapidly charging and discharging at a high rate and a preparation method thereof, and a MXene aerogel current collector is obtained by compounding two-dimensional transition metal titanium carbide and reduced graphene oxide (rGO). The MXene aerogel current collector is a nanoporous structure and has a pro-lithium functional group. The MXene aerogel lithium negative electrode current collector is applied to a lithium-lithium iron phosphate full battery, and the high-rate rapid charging and discharging of a battery is achieved.

Description

technical field [0001] The invention belongs to the technical field of metal lithium batteries using metal lithium as a negative electrode, and in particular relates to a lithium negative electrode current collector capable of high-rate rapid charge and discharge, and a preparation method and application thereof. Background technique [0002] The emergence of lithium-ion batteries provides important technical support for people to store / utilize energy quickly and efficiently. In recent years, people's demand for portable electronic equipment and electric vehicles has increased day by day, and their performance requirements have also increased sharply. The specific energy of traditional lithium-ion batteries can no longer meet the needs of electronic products and electric vehicles for battery energy. Therefore, the development of secondary batteries with higher specific energy metal lithium as the negative electrode has become the development direction of the energy storage f...

Claims

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Application Information

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IPC IPC(8): H01M4/64H01M4/66H01M10/052
CPCH01M4/64H01M4/663H01M4/665H01M10/052H01M2004/027Y02E60/10
Inventor 罗加严张欣悦
Owner TIANJIN UNIV
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