Lithium metal negative electrode protection method for improving lithium utilization efficiency

A lithium metal negative electrode, lithium metal technology, applied in the direction of negative electrode, positive electrode, electrode manufacturing, etc., can solve the problems of low Coulombic efficiency, inhomogeneous side reaction activity, low cycle capacity retention rate of lithium battery, etc.

Inactive Publication Date: 2020-10-20
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Lithium metal anode has problems such as uneven lithium deposition-dissolution and high activity of side reactions between electrolyte and lithium metal during the cycle, resulting in the growth of lithium dendrites, low Coulombic efficiency, and low cycle capacity retention of lithium batteries. Waiting for bad results

Method used

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  • Lithium metal negative electrode protection method for improving lithium utilization efficiency
  • Lithium metal negative electrode protection method for improving lithium utilization efficiency
  • Lithium metal negative electrode protection method for improving lithium utilization efficiency

Examples

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Embodiment 1

[0028] This embodiment provides a lithium metal negative electrode protection method that improves lithium utilization efficiency. In lithium batteries: the lithium metal deposited on the current collector is used as the negative electrode of the battery, where the current collector is carbon paper, and the capacity of lithium metal deposited on the current collector is 0.6mAh / cm 2 ; Lithium iron phosphate is used as the positive electrode of the battery; the polymer is added as an additive to the ester electrolyte, and the amount of the polymer added is 2wt% of the ester electrolyte.

[0029] The above-mentioned process of depositing lithium metal on the current collector as the negative electrode of the battery includes: first assembling a half-cell with the positive electrode carbon paper and the negative electrode lithium sheet, and depositing a certain capacity of metal on the carbon paper by setting the current density and time constant current discharge. Lithium, and th...

Embodiment 2

[0033] This embodiment provides a lithium metal negative electrode protection method that improves lithium utilization efficiency. In lithium batteries: the lithium metal deposited on the current collector is used as the negative electrode of the battery, where the current collector is carbon paper, and the capacity of lithium metal deposited on the current collector is 0.1mAh / cm 2 ; Lithium iron phosphate is used as the positive electrode of the battery; the polymer is added as an additive to the ester electrolyte, and the amount of the polymer added is 2wt% of the ester electrolyte.

[0034] The above-mentioned process of depositing lithium metal on the current collector as the negative electrode of the battery includes: first assembling a half-cell with the positive electrode carbon paper and the negative electrode lithium sheet, and by setting the current density and time constant current discharge, a certain capacity will be deposited on the carbon paper. Lithium metal, a...

Embodiment 3

[0038] This embodiment provides a lithium metal negative electrode protection method that improves lithium utilization efficiency. In a lithium battery: the lithium metal deposited on the current collector is used as the negative electrode of the battery, where the current collector is carbon paper, and the capacity of lithium metal deposited on the current collector is 5mAh / cm 2 ; Lithium iron phosphate is used as the positive electrode of the battery; the polymer is added as an additive to the ester electrolyte, and the amount of the polymer added is 2wt% of the ester electrolyte.

[0039] The above-mentioned process of depositing lithium metal on the current collector as the negative electrode of the battery includes: first assembling a half-cell with the positive electrode carbon paper and the negative electrode lithium sheet, and by setting the current density and time constant current discharge, a certain capacity will be deposited on the carbon paper. Lithium metal, and...

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Abstract

The invention discloses a lithium metal negative electrode protection method for improving lithium utilization efficiency, and relates to the field of lithium batteries. In the lithium battery, lithium metal is deposited on a current collector to serve as a battery negative electrode, and a high-molecular polymer serves as an additive to be added into an ester electrolyte; the high-molecular polymer is prepared by carrying out polymerization reaction on a monomer A which is acrylonitrile or a derivative thereof, a monomer B which is perfluoroalkyl ethyl methacrylate or a derivative thereof anda monomer C which is alkyl alcohol diacrylate or a derivative thereof. The surface of the lithium metal is negatively charged and -CN and-CF3 in the high-molecular polymer are relatively strong electron withdrawing groups, so that the electrolyte additive is promoted to be preferentially adsorbed on the surface of the lithium metal, and contact between other components in the electrolyte and thelithium metal is reduced; and thus continuous side reaction can be avoided, lithium deposition can be finer and more uniform, generation of lithium dendrites is slowed down, and high lithium utilization efficiency of the lithium metal negative electrode is realized.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a lithium metal negative electrode protection method for improving lithium utilization efficiency. Background technique [0002] Lithium metal anode has problems such as uneven lithium deposition-dissolution and high activity of side reactions between electrolyte and lithium metal during the cycle, resulting in the growth of lithium dendrites, low Coulombic efficiency, and low cycle capacity retention of lithium batteries. Wait for bad results. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to reduce the contact between components other than lithium ions and the lithium metal negative electrode in the lithium battery electrolyte, thereby avoiding the occurrence of continuous side reactions, and making lithium deposition finer and more uniform, thereby slowing down lithium branching. The formation of crystals can realize high lithium utilization effic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M4/04H01M10/0567H01M4/38H01M10/0525
CPCH01M4/1395H01M4/0452H01M10/0567H01M4/382H01M10/0525H01M2004/027Y02E60/10H01M10/4235H01M4/663H01M4/5825H01M10/0568H01M10/0569H01M2004/028H01M4/0404H01M4/0438H01M4/0402H01M4/134H01M4/136
Inventor 黄令王琼雷盈师晨光孙世刚
Owner XIAMEN UNIV
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