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Composite current collector for lithium battery without lithium negative electrode and preparation method of composite current collector

A current collector and composite solution technology, applied in the direction of lithium batteries, battery electrodes, electrode carriers/current collectors, etc., can solve the problem of inability to effectively block the continuous reaction of electrolyte and negative electrode, affect the cycle life of lithium metal batteries, and fail to support battery operation, etc. problems, to achieve the effect of improving the activation and inhibition of dead lithium, accelerating the transmission of lithium ions, and inhibiting continuous decomposition

Pending Publication Date: 2022-07-22
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Design and testing of anode-free lithium metal batteries can affect lithium metal battery cycle life
However, the surface of existing commercial copper current collectors and carbon paper current collectors is easy to accumulate dead lithium, resulting in insufficient active lithium in the negative electrode lithium battery system, which cannot support battery operation; and the formation of SEI film mechanically on the surface of commercial copper current collectors and carbon paper current collectors Poor performance, unable to effectively block the continuous reaction between the electrolyte and the negative electrode

Method used

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  • Composite current collector for lithium battery without lithium negative electrode and preparation method of composite current collector
  • Composite current collector for lithium battery without lithium negative electrode and preparation method of composite current collector
  • Composite current collector for lithium battery without lithium negative electrode and preparation method of composite current collector

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Embodiment 1

[0038] The current collector preparation process of the present embodiment is as follows:

[0039] Step 1. Disperse the strontium iodide in ethanol, stir magnetically for 12 hours at 20°C with a rotating speed of 600 r / min, until the powder is completely dissolved, to obtain a concentrated strontium iodide / ethanol solution, wherein the mass ratio of strontium iodide powder to ethanol is 0.5:10;

[0040] Step 2. Mix the concentrated strontium iodide / ethanol solution obtained in step 1 with n-hexane, and stir for 6 hours at room temperature under the condition that the rotational speed is 600 r / min to obtain a dilute solution of strontium iodide / ethanol / n-hexane, wherein strontium iodide The mass ratio of ethanol concentrated solution and n-hexane is 1:1.5;

[0041] Step 3, soak the carbon paper substrate with a thickness of 50 μm in the dilute solution of strontium iodide / ethanol / n-hexane obtained in step 2 for 2 h to obtain a composite solution current collector;

[0042] St...

Embodiment 2

[0051] The current collector preparation process of the present embodiment is as follows:

[0052] Step 1. Disperse barium chloride in acetone, stir magnetically for 15h at 25°C with a rotating speed of 700r / min, until the powder is completely dissolved to obtain a concentrated barium chloride / acetone solution, wherein the mass of barium chloride / powder and acetone is The ratio is 1:10;

[0053] Step 2. Mix the concentrated solution of barium chloride / acetone obtained in step 1 with dimethylformamide, and stir for 7h under the condition that the rotating speed is 700r / min at room temperature to obtain the diluted barium chloride / acetone / dimethylformamide. solution, wherein the mass ratio of barium chloride / acetone concentrated solution and dimethylformamide is 1:1.5;

[0054] Step 3, soaking the carbon paper substrate with a thickness of 50 μm in the dilute solution of barium chloride / acetone / dimethylformamide obtained in step 2 for 2.5 hours to obtain a composite solution cu...

Embodiment 3

[0057] The current collector preparation process of the present embodiment is as follows:

[0058] Step 1. Disperse beryllium bromide in dimethylacetamide, stir magnetically for 24 hours at 40°C with a speed of 1000 r / min, until the powder is completely dissolved, beryllium bromide / dimethylacetamide concentrated solution, in which bromide The mass ratio of beryllium powder to dimethylacetamide is 1:10;

[0059] Step 2. Mix the concentrated beryllium bromide / dimethylacetamide solution obtained in step 1 with dimethylpyrrolidone, and stir for 12h at room temperature under the condition that the rotating speed is 1000r / min to obtain beryllium bromide / dimethylacetamide / Dimethylpyrrolidone solution, wherein the mass ratio of beryllium bromide / dimethylacetamide concentrated solution and dimethylpyrrolidone is 1:1.5;

[0060] Step 3, soak the carbon paper substrate with a thickness of 50 μm in the dilute solution of beryllium bromide / dimethylacetamide / dimethylpyrrolidone obtained ...

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Abstract

The invention discloses a composite current collector for a lithium battery without a lithium negative electrode and a preparation method of the composite current collector, and belongs to the technical field of lithium ion battery material preparation. The problems that dead lithium is easily gathered on the surface of an existing current collector, so that active lithium in a negative-electrode-free lithium battery system is insufficient, battery operation cannot be supported, an SEI film formed on the surface is poor in mechanical performance, and continuous reaction between an electrolyte and a negative electrode cannot be effectively blocked are solved. According to the invention, the carbon paper is taken as the substrate and is soaked in the organic solvent containing the strong reducing compound to form the composite current collector, so that the dead lithium activation and inhibition capability of the current collector is effectively improved, the active lithium resource in a negative-electrode-free lithium battery system is protected, and the cycle performance of the battery is further remarkably improved.

Description

technical field [0001] The invention relates to a composite current collector for a lithium-free negative electrode lithium battery and a preparation method thereof, belonging to the technical field of lithium-ion battery material preparation. Background technique [0002] According to the definition of the U.S. Department of Energy, the first-generation lithium battery uses a graphite negative electrode, which can achieve a maximum energy density of 600Wh / L; the second-generation lithium battery uses a silicon negative electrode, and can achieve a maximum energy density of about 800Wh / L; the first generation and The second generation belongs to the traditional lithium-ion battery. The third-generation lithium battery will use metal anodes with higher energy density or even have no anodes, which can exceed 1000Wh / L of energy density. By ditching the graphite host and storing lithium in metallic form, anodes with high energy density can be obtained. However, the high reacti...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/62H01M10/052
CPCH01M4/663H01M4/665H01M4/628H01M10/052Y02E60/10
Inventor 何伟东东立伟杨春晖刘远鹏董运发韩杰才
Owner HARBIN INST OF TECH
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