Lithium strip and preparation method and application thereof

A technology for lithium strips and lithium supplementation, applied in electrode manufacturing, lithium storage batteries, electrode rolling/calendering, etc., can solve the problems of poor lithium metal strength, battery short circuit, and limit the large-scale use of lithium powder, and achieve enhanced strength, increased The effect of bonding

Active Publication Date: 2020-12-04
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among the current lithium supplementation technologies that can be industrialized, lithium powder and ultra-thin lithium strips are the main research trends. However, the preparation process of lithium powder is relatively complicated, involving the heating and melting of lithium metal and post-processing. The use of ultra-thin lithium strips has strict requirements on equipment and environment, which also limits the large-scale use of lithium powder. Most of them can be completed at a lower temperature, so the difficulty of manufacturing is much lower than the preparation process of lithium powder
[0005] However, most current lithium ribbons use metal films or polymer films that are inert to metals as supports. This is because lithium

Method used

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  • Lithium strip and preparation method and application thereof
  • Lithium strip and preparation method and application thereof
  • Lithium strip and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] In a drying room with a dew point less than -40°C, mix the lithium metal particle powder and PTFE (polytetrafluoroethylene), first at a stirring speed of 2000rpm, stirring and dispersing for 5 minutes, to fully mix the lithium metal powder and the polymer; Then carry out high-speed shear stirring at a speed of 20000rpm, adopt pulse type stirring, stirring time 1min, stop time 1min, stirring total time 20min, obtain dry process powder;

[0084] Wherein, the mass of the dry powder is 100%, and the dry powder includes the following components:

[0085] Lithium metal particle powder 95%

[0086] PTFE 5%;

[0087] Take a certain amount of dry powder and put it on the roller press equipment with adjustable roller gap. The rollers are cleaned and wiped with silicone oil to avoid sticking during the cold pressing process. The roller gap is 10μm and the speed is 5rpm. The rolling speed is 20°C to prepare a self-supporting lithium ribbon with a thickness of 13 μm;

[0088] Aft...

Embodiment 2

[0091] In a drying room with a dew point less than -40°C, mix the lithium metal particle powder and PTFE (polytetrafluoroethylene), first at a stirring speed of 2500rpm, stirring and dispersing for 5 minutes, to fully mix the lithium metal powder and the polymer; Then carry out high-speed shear stirring at a speed of 22000rpm, adopt pulse type stirring, stir for 1min, stop for 1min, and stir for a total of 20min to obtain a dry powder;

[0092] Wherein, the mass of the dry powder is 100%, and the dry powder includes the following components:

[0093] Lithium metal particle powder 90%

[0094] PTFE 10%;

[0095] Take a certain amount of dry powder and place it on the roller press equipment with adjustable roller gap. The rollers are cleaned and wiped with silicone oil to avoid sticking during the cold pressing process. The roller gap is 5 μm and the speed is 5 rpm. The rolling speed is 20°C to prepare a self-supporting lithium ribbon with a thickness of about 7 μm;

[0096] Th...

Embodiment 3

[0101] The difference between this embodiment and Example 1 is that, based on the mass of the dry powder as 100%, the dry powder includes the following components:

[0102] Lithium metal particle powder 10%

[0103] PTFE 90%;

[0104] Other parameters and conditions are exactly the same as in Example 1.

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Abstract

The invention provides a lithium strip and a preparation method and application thereof. The lithium strip comprises a polymer of a networked structure and lithium metal particles bonded to the surface of the polymer, has higher mechanical strength than a common lithium strip, is high in fitting degree with an electrode pole piece and high in lithium supplementing efficiency, and can effectively improve the first effect of a battery. The preparation method comprises the following steps: premixing a fibrosis polymer with lithium metal particles, drawing the fibrosis polymer to form fibers underthe effect of shearing force, and carrying out cold pressing treatment or hot pressing treatment under the protection of inert gas until the thickness of the fibers reaches a preset thickness, so asto obtain the lithium strip. According to the invention, influence on lithium metal particles is small. The generation of lithium by-products is reduced, no solvent is needed in the preparation process, the tedious processes of solvent screening and solvent recovery are reduced, and the cost and environmental pollution are reduced.

Description

technical field [0001] The invention belongs to the field of battery materials, and relates to a lithium strip, a preparation method and application thereof. Background technique [0002] With the rapid development of new energy vehicles, the requirements for energy density and safety performance of vehicle power batteries are constantly increasing. It is estimated that by 2025, the energy density of power batteries will reach more than 500Wh / kg. With the continuous improvement of the energy density of power batteries, the gram capacity and compaction density of existing negative electrode materials have reached the limit value. Therefore, the use of silicon carbon materials will be a hot spot in the future. At the same time, the low initial charge and discharge efficiency of silicon carbon materials, large expansion, and long-term cycle will bring about material pulverization problems, as well as matching problems with related electrolytes and glues, which have always plag...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/04H01M4/139H01M10/052
CPCH01M4/0435H01M4/13H01M4/139H01M10/052Y02E60/10
Inventor 马忠龙赵晓宇秦士林郑晓醒
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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