Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

3D lithium metal negative electrode, lithium metal battery and preparation and application thereof

A technology for lithium metal batteries and metal lithium layers, which is applied in electrode manufacturing, battery electrodes, lithium storage batteries, etc., can solve the problems that lithium metal negative electrodes are difficult to be practical, achieve uniform lithium nucleation and deposition sites, and realize cycle, The effect of improving electrical properties

Active Publication Date: 2019-05-31
DYNABAT NEW ENERGY SCI & TECH CO CLD FUJIAN
View PDF9 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, metal lithium negative electrodes obtained from these expensive raw materials or complex preparation processes are difficult to be practical

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
  • 3D lithium metal negative electrode, lithium metal battery and preparation and application thereof
  • 3D lithium metal negative electrode, lithium metal battery and preparation and application thereof
  • 3D lithium metal negative electrode, lithium metal battery and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Spherical copper particles (120nm) were placed in an argon atmosphere at 600°C for 3h heat treatment to obtain a 3D copper skeleton with a porosity of 42% and a thickness of 100 μm ( figure 1 , is a 3D copper framework with an ordered structure and a suitable pore structure). The 3D copper skeleton is used as the working electrode, the metal lithium sheet is used as the counter electrode, and 1M LiTFSI / DOL:DME (volume ratio=1:1) contains 2wt.% LiNO 3 Assemble the button battery for the electrolyte, and conduct a charge-discharge cycle test. The test found that the 3D copper skeleton made in this case is composed of pure copper ( figure 2 ), achieving uniform dendrite-free lithium deposition and effectively avoiding the appearance of lithium dendrites. at 3mA / cm 2 Under the current density and 4mAh / cm2 areal capacity, the stable cycle can exceed 600 cycles (Table 1).

Embodiment 2

[0064] The 3D copper skeleton obtained in Example 1 is used as a working electrode, and then at a current density of 0.1mA / cm2, electroplate 5mAh / cm2 metal lithium onto the electrode to prepare a composite negative electrode material, and then form a composite negative electrode material with a graphene positive electrode rich in S Lithium-sulfur battery, in 1M LiTFSI / DOL:DME (volume ratio = 1:1) electrolyte solution containing 1wt.% LiNO3, at 0.5C, conduct charge-discharge cycle test. The corresponding test results are shown in Table 2.

Embodiment 3

[0075] Titanium, iron, nickel, copper, and tungsten particles (with a particle size of about 250nm) were placed in an argon atmosphere at 660°C for 4 hours of heat treatment to obtain a 3D titanium skeleton with a porosity of about 47% and a thickness of about 120μm. Skeleton, 3D nickel skeleton, 3D copper skeleton, 3D tungsten skeleton. These electrodes were respectively used as working electrodes, metal lithium sheets were used as counter electrodes, and 1M LiTFSI / DOL:DME (volume ratio=1:1) containing 2wt.% LiNO 3 Assemble the button battery for the electrolyte, and conduct a charge-discharge cycle test at a current density of 3mA / cm2 and an area capacity of 3mAh / cm2. The corresponding test results are shown in Table 3.

[0076] table 3

[0077]

[0078]

[0079] The results show that copper and titanium, as the 3D framework materials, can exhibit better cycle performance.

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
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention belongs to the field of lithium metal battery materials and particularly discloses a 3D lithium metal negative electrode composed of a 3D metal skeleton and a metal lithium layer composited in the skeleton. The 3D metal skeleton has a porosity of 20-80% and a thickness of 25 to 800[mu]m. The invention also provides a preparation method of the 3D lithium metal negative electrode and an application method of the 3D lithium metal negative electrode in a lithium metal battery. The 3D metal skeleton of the invention has adjustable porosity, controllable structure, high mechanical strength and a simple preparation process. The obtained 3D lithium metal negative electrode with high specific surface area can significantly reduce the apparent current density. Further, the controllablespecific surface area and the regular nucleation site can achieve uniform lithium deposition and alleviate the volume effect of the lithium metal battery, so as to finally obtain a lithium metal battery with high coulombic efficiency and a long cycle life.

Description

technical field [0001] The invention belongs to the field of high-energy batteries, and in particular relates to the preparation and application of a 3D lithium metal negative electrode. Background technique [0002] Lithium metal is known as the Holy Grail-like electrode material due to its ultra-high theoretical specific capacity (3860mAh / g) and the lowest electrode potential (-3.04V). Therefore, batteries with metallic lithium as the negative electrode have been extensively prepared and studied. However, the dendrite problem and the continuous interfacial reaction caused by the direct use of metal lithium as the negative electrode greatly limit the improvement of its cycle performance, making it difficult for lithium metal batteries to replace the currently widely used secondary batteries with graphite as the negative electrode. [0003] In order to solve this problem, a large number of scientific researchers have devoted themselves to solving the lithium dendrite proble...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/02H01M4/04H01M4/66H01M4/80H01M10/052H01M12/08
CPCY02E60/10
Inventor 洪树范海林赖延清洪波
Owner DYNABAT NEW ENERGY SCI & TECH CO CLD FUJIAN
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com