Stable lithium metal negative electrode

A technology of lithium metal negative electrode and lithium metal, which is applied in the field of lithium metal negative electrode, can solve the problems of battery capacity loss, reduction of electrode volume energy density, and damage of solid electrolyte interfacial film, so as to reduce effective current density, facilitate industrialization, and benefit The effect of ion transport

Inactive Publication Date: 2018-08-21
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
View PDF8 Cites 30 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the lithium dendrites continue to grow, not only will the solid electrolyte interface film be destroyed, but also the exposed lithium will continue to react with the electrolyte, consume the electrolyte, and will also pierce the separator to cause a short circuit inside the battery, causing a fire or even an explosion.
In addition, lithium dendrites are easy to fall off from the electrode, so they cannot be used effectively, forming "dead lithium", resulting in loss of battery capacity
[0003] At present, the three-dimensional conductive network matrix is ​​mostly used for lithium metal deposition. Although the three-dimensional c

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Stable lithium metal negative electrode
  • Stable lithium metal negative electrode
  • Stable lithium metal negative electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment provides a stable lithium metal negative electrode, including a negative electrode current collector and a negative electrode active material layer attached to the surface of the current collector. The negative electrode active material layer is a lithium metal layer. Lithophilic nano-array on the current collector body, and the current collector body is copper foil, the lithium-friendly nano-array is a copper oxide nanosheet array, the thickness of the lithium-friendly nano-array is 0.8 μm-20 μm, and the nano-sheet spacing in the lithium-friendly nanoarray is 100nm-1μm.

[0038] Its preparation method comprises the following steps:

[0039] Step 1, soak the copper foil with 2mol / L dilute hydrochloric acid for 10 minutes at room temperature, then wash it with deoxygenated ethanol three times, and finally wash it once with deoxygenated deionized water;

[0040] Step 2, soak the copper foil cleaned in step 1 in dilute ammonia solution with a concentration...

Embodiment 2

[0046] The difference from Example 1 is: the reaction time in step 2 is 4 hours, and all the other are the same as Example 1, and will not be repeated here.

Embodiment 3

[0048] The difference from Example 1 is: the reaction time in step 2 is 12 hours, and all the other are the same as Example 1, and will not be repeated here.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to view more

Abstract

The invention belongs to the technical field of a battery and particularly relates to a stable lithium metal negative electrode. The stable lithium metal negative electrode comprises a negative electrode current collector and a negative active material layer loaded on the surface of the current collector; the negative active material layer is a lithium metal layer; the negative electrode current collector comprises a current collector body and a lithium-philic nanometer array growing on the current collector body in situ; the thickness of the lithium-philic nanometer array is 0.8 <mu>m to 20 <mu>m. Compared with the prior art, the stable lithium metal negative electrode has the following advantages: the lithium-philic nanosheet array is arranged on the current collector body, so that ion transmission is facilitated, uniform distribution of lithium ions can be realized, the affinity of the stable lithium metal negative electrode and the lithium metal can be improved, a lithium-philic nucleation site is provided, and uniform nucleation and stable deposition of the lithium metal in the deposition process are realized. The array structure growing in situ can guarantee to be in tight contact with a copper current collector and reduce the effective current density of the electrode, so that uniform deposition of the lithium metal is realized; the lithium-philic current collector can inhibit the growth of lithium dendrites.

Description

technical field [0001] The invention belongs to the technical field of batteries, in particular to a stable lithium metal negative electrode. Background technique [0002] In recent years, the rapid development of electric vehicles, mobile electronic devices and rechargeable power sources makes it urgent to develop batteries with higher energy density. For this reason, people try to explore electrode materials and battery systems with high specific capacity and specific energy, and study their charging and discharging working principles. The theoretical specific capacity of metal lithium is as high as 3860mAh / g, the electrode potential is -3.045V (relative to the standard hydrogen electrode), and the reducibility is extremely strong. Therefore, metal lithium has been widely concerned by researchers as the negative electrode material of lithium batteries. But metal lithium has not been able to become the anode material of commercial secondary batteries so far. The reason is...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01M4/13H01M4/66
CPCH01M4/13H01M4/66Y02E60/10
Inventor 吕伟张琛黄志佳张云博游从辉杨全红康飞宇
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products