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Lithium metal battery negative electrode surface modification method

A technology for lithium metal batteries and negative electrodes, which is applied in the field of modification of the negative electrode surface of lithium metal batteries, can solve the problems of inability to induce uniform nucleation of lithium, poor lithophilicity, etc., and achieve improved electrochemical performance, improved cycle performance, and uniform current density. Effect

Active Publication Date: 2020-12-11
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods have made some breakthroughs, they all have certain limitations, such as poor lithiophilicity, resulting in the inability to induce uniform nucleation of lithium, etc.

Method used

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  • Lithium metal battery negative electrode surface modification method
  • Lithium metal battery negative electrode surface modification method
  • Lithium metal battery negative electrode surface modification method

Examples

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Effect test

Embodiment 1

[0022] A method for modifying the negative electrode surface of a lithium metal battery, comprising the following steps:

[0023] 1) Weigh lithium bromide and lithium nitrate in proportion, dissolve them in tetraethylene glycol dimethyl ether solvent, seal them with plastic wrap and place them in a glove box at room temperature (H 2 O, O 2 All less than 0.01ppm) Stir evenly to obtain a clear and transparent polishing electrolyte;

[0024] 2) Assemble the lithium symmetric battery. During the assembly process, add the polished electrolyte obtained in step 1) into the lithium symmetric battery to wet the diaphragm;

[0025] 3) Discharge the lithium symmetric battery assembled in step 2) at the set current density and discharge time, polish the surface of the negative electrode, and disassemble the lithium symmetric battery after completion to obtain the modified lithium metal (negative electrode );

[0026] 4) The lithium metal modified in step 3) is used in the subsequent ba...

Embodiment 2

[0031] A method for modifying the negative electrode surface of a lithium metal battery, comprising the following steps:

[0032] 1) Weigh 0.25mmol (0.0217g) lithium bromide (LiBr) and 5mmol (0.3447g) lithium nitrate (LiNO 3 ), dissolved in 5 mL of tetraethylene glycol dimethyl ether (TEGDME), sealed with plastic wrap and stirred at room temperature for 2 hours to obtain a clear and transparent polishing electrolyte.

[0033] 2) Use the CR2032 battery case to assemble a lithium symmetrical battery, put a lithium sheet (d=15.6mm) in the positive electrode case, then put in the PP diaphragm, and then add 50 μL of the polishing electrolyte obtained in step 1) to wet the diaphragm , and then assemble the battery sequentially according to the order of lithium sheet, gasket, shrapnel, and negative electrode shell, and seal the assembled lithium symmetrical battery with a tablet press.

[0034]3) Put the lithium symmetric battery assembled in step 2) at 0.05mA / cm 2 Discharge for 10...

Embodiment 3

[0039] A method for modifying the negative electrode surface of a lithium metal battery, comprising the following steps:

[0040] 1) Weigh 0.15mmol (0.0130g) lithium bromide (LiBr) and 4mmol (0.2758g) lithium nitrate (LiNO 3 ), dissolved in 5 mL of tetraethylene glycol dimethyl ether (TEGDME), sealed with plastic wrap and stirred at room temperature for 2 hours to obtain a clear and transparent polishing electrolyte.

[0041] 2) Use the CR2032 battery case to assemble a lithium symmetrical battery, put a lithium sheet (d=15.6mm) in the positive electrode case, then put in the PP diaphragm, and then add 50 μL of the polishing electrolyte obtained in step 1) to wet the diaphragm , and then assemble the battery sequentially according to the order of lithium sheet, gasket, shrapnel, and negative electrode shell, and seal the assembled lithium symmetrical battery with a tablet press.

[0042] 3) Put the lithium symmetric battery assembled in step 2) at 0.01mA / cm 2 Discharge for 1...

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Abstract

The invention discloses a lithium metal battery negative electrode surface modification method which is characterized by comprising the following steps: 1) weighing lithium bromide and lithium nitratein proportion, dissolving lithium bromide and lithium nitrate in a tetraethylene glycol dimethyl ether solvent, sealing the mouth with a preservative film, performing sealing at normal temperature, and uniformly performing stirring to prepare a clear and transparent polishing electrolyte; 2) assembling the lithium symmetric battery, adding the polishing electrolyte obtained in the step 1) into the lithium symmetric battery in the assembling process, and wetting a diaphragm; and 3) discharging the lithium symmetric battery assembled in the step 2) under set current density and discharge time,and polishing the surface of a negative electrode to obtain the modified lithium metal battery. The method has the advantages that the polished lithium surface is smooth and flat, the growth of lithium dendrites in the charging and discharging process of the lithium metal battery can be effectively inhibited, and the cycle performance of the lithium metal battery is improved.

Description

technical field [0001] The invention relates to the field of lithium metal batteries, in particular to a method for modifying the surface of the negative electrode of the lithium metal battery. Background technique [0002] Metal lithium as the negative electrode is currently an ideal negative electrode material that can increase battery capacity because of its high theoretical specific capacity (3860 mAh g -1 ) and the lowest redox potential, these characteristics allow lithium metal batteries to have higher specific capacity and higher operating voltage (see references Jun Liu et al, Nature Energy, 2019, 4(3)180-186). Due to these excellent characteristics of lithium metal, researchers have turned to lithium metal as the negative electrode material. However, although lithium metal has advantages as the negative electrode, it still faces many difficulties in the actual application process. These problems mainly include the following aspects: First, the lithium metal negati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M4/04H01M10/052
CPCH01M4/0438H01M4/1395H01M10/052Y02E60/10
Inventor 辛星时开元朱梦婷
Owner NINGBO UNIV
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