Metal lithium secondary battery and negative electrode and porous copper current collector thereof

A technology of secondary batteries and current collectors, applied in battery electrodes, lithium batteries, electrode carriers/current collectors, etc., can solve the problems of increasing the internal resistance and polarization of batteries, difficult practical application, and complex conductive frameworks, and achieves slowing down. Effect of volume change, inhibition of lithium dendrite generation, and improvement of coulombic efficiency

Inactive Publication Date: 2016-09-07
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these three-dimensional conductive framework structures often require additional steps to be added to the current collector, thereby increasing the internal resistance and polarization of the battery.
Moreover, the complex and time-consuming preparation process of these conductive frameworks makes the preparation cost high and difficult for practical application.

Method used

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  • Metal lithium secondary battery and negative electrode and porous copper current collector thereof
  • Metal lithium secondary battery and negative electrode and porous copper current collector thereof
  • Metal lithium secondary battery and negative electrode and porous copper current collector thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The present embodiment provides a porous copper current collector for a negative electrode of a metal lithium secondary battery. The current collector has a three-dimensional connected porous structure and has a pore diameter in the range of 0.1-20 μm.

[0039] (1) In this embodiment, the method for preparing the porous copper current collector is a chemical dealloying method, which is obtained by chemically dealloying the binary Cu-Zn alloy strip. The Cu-Zn alloy used is H62 brass with a copper content of 60.5 to 63.5%. The thickness of the alloy strip is 20 μm.

[0040] First, clean the contaminants on the surface of the Cu-Zn alloy strip with absolute ethanol. Then, the alloy strip was immersed in a mixed solution of 1 mol / L dilute hydrochloric acid and 5 mol / L ammonium chloride solution by the dipping method in a water bath at 70° C. for chemical dealloying reaction for 12 hours. After that, the sample was taken out, and the dealloyed sample was cleaned four times with...

Embodiment 2

[0051] The difference from Example 1 is: (1) The process of preparing the porous copper current collector is as follows: Binary Cu-Zn alloy strip (H62 brass, copper content 60.5-63.5%) is used, and its thickness is 30 μm. The alloy strip was immersed in a mixed solution of 2mol / L dilute hydrochloric acid and 4mol / L ammonium chloride solution in a water bath at 80°C for chemical dealloying reaction for 9h. The rest is the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0053] The difference from Example 1 is that the process of preparing the porous copper current collector in (1) is as follows: a binary Cu-Mg alloy strip is used, in which the copper content is 40%, and the thickness is 40 μm. The alloy strip was immersed in a mixed solution of 2 mol / L dilute hydrochloric acid and 1 mol / L phosphoric acid in a water bath at 60°C for chemical dealloying reaction for 15 hours. The rest is the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of a lithium secondary battery, and particularly relates to a porous copper current collector, capable of retraining generation of lithium dendrites, of the metal lithium secondary battery. The porous copper current collector has a connected porous channel structure, and the pore diameter is 0.1-2[mu]m. Compared with the prior art, the three-dimensional porous structure can lower the effective current density of the electrode by enlarging the specific surface area of the electrode so as to restrain the generation of lithium dendrites and to stabilize the SEI film; in addition, the three-dimensional porous structure can accommodate the deposited lithium metal so as to slow down the volume change of the lithium metal negative electrode in the charging-discharging cyclic process; and therefore, when the three-dimensional porous copper current collector is applied to the negative electrode of the metal lithium secondary battery, the coulombic efficiency, the circulating stability and the safety of the battery can be effectively improved in the cyclic process.

Description

Technical field [0001] The invention belongs to the technical field of lithium secondary batteries, and in particular relates to a metal lithium secondary battery capable of inhibiting the generation of lithium dendrites, its negative electrode and a porous copper current collector. Background technique [0002] In recent years, the rapid development of portable electronic devices and electric vehicles has made it extremely urgent to increase the energy density of lithium secondary batteries. The density of metallic lithium is low (0.53g / cm 3 ), low standard electrode potential (-3.04V), high theoretical specific capacity (3860mAh g -1 ), these characteristics enable it to significantly increase the energy density of the battery when used as the negative electrode of a lithium secondary battery. However, the uneven deposition of lithium metal during the charging and discharging process will lead to the production of a large number of lithium dendrites, which will pierce the batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/80H01M4/134H01M10/052
CPCH01M4/134H01M4/661H01M4/80H01M10/052H01M4/139Y02E60/10
Inventor 杨全红韵勤柏贺艳兵
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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