Lithium metal composite strip capable of inhibiting dendritic crystal growth and production equipment and energy storage device thereof

A technology for composite strips and production equipment, applied in metal material coating technology, electrochemical generators, coatings, etc., can solve problems such as increased battery internal resistance, increased manufacturing costs, and mismatched electrode capacity, achieving a combination of Strong force and the effect of inhibiting the growth of lithium dendrites

Pending Publication Date: 2021-03-05
QINGDAO NINEX NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tin composite lithium electrode sprays a layer of tin powder on the metal lithium sheet, although it can inhibit the growth of dendrites, but the tin powder layer will block the conduction of the separator and even lead to ion isolation, resulting in an increase in the internal resistance of the battery.
In addition, the particle size of the tin powder is relatively large, and the thickness of the metal lithium sheet is required to be larger than the particle size of the tin powder. Therefore, the thickness of the metal lithium sheet is thicker, resulting in a mismatch in the capacity between the electrodes, resulting in material waste and increased manufacturing costs. and reduce the energy density of energy storage devices

Method used

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  • Lithium metal composite strip capable of inhibiting dendritic crystal growth and production equipment and energy storage device thereof
  • Lithium metal composite strip capable of inhibiting dendritic crystal growth and production equipment and energy storage device thereof
  • Lithium metal composite strip capable of inhibiting dendritic crystal growth and production equipment and energy storage device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Such as figure 1 Shown is a schematic structural view of an embodiment of the lithium metal composite strip for inhibiting dendrite growth in the present invention. The lithium metal composite strip for inhibiting dendrite growth in this embodiment includes a lithium metal strip, the lithium metal strip includes a lithium metal layer 1, and a lithium alloy layer 2 for suppressing lithium dendrites is provided on the lithium metal layer 1.

[0053]Specifically, the lithium metal strip in this embodiment also includes a current collector strip 3, at least one side of the current collector strip 3 is compounded with a lithium metal layer 1, and the lithium alloy layer 2 is arranged on the lithium metal layer 1 facing away from the current collector. One side of the fluid strip 3. In this embodiment, the lithium metal layer 1 is provided on both sides of the current collector strip 3 , of course, the lithium metal layer 1 may also be provided on only one side of the curren...

Embodiment 2

[0059] Such as image 3 Shown is a schematic structural diagram of an embodiment of the energy storage device. The energy storage device of this embodiment includes a positive electrode 5 and a negative electrode 6, an electrolyte that is electronically insulated and ionically conductive is provided between the positive electrode 5 and the negative electrode 6, and the positive electrode 5 and / or the negative electrode 6 adopts such as The lithium metal composite strip described in Example 1 is made.

[0060] Specifically, the electrolyte can be a solid electrolyte or a liquid electrolyte, and when the electrolyte 7 is a liquid electrolyte, a separator 7 is also provided between the positive electrode 5 and the negative electrode 6, such as image 3 shown.

[0061] The negative electrode of this embodiment is made of the lithium metal composite strip as described in Example 1, and the positive electrode can be made of various existing positive electrode active materials and ...

Embodiment 3

[0065] Such as Figure 4-7 Shown is a schematic structural view of the production equipment of the lithium metal composite strip that inhibits dendrite growth in the present invention. The production equipment of the lithium metal composite strip that suppresses dendrite growth of the present embodiment includes:

[0066] The unwinding mechanism 10 is used for unwinding the lithium metal strip;

[0067] The coating section is used to coat a layer of liquid lithium alloy layer on the surface of the lithium metal layer:

[0068] Shaping section, a cooling device is provided in the shaping section, and the cooling device cools the liquid lithium alloy layer prepared by the coating section according to the set temperature-time control line, so that the liquid lithium alloy layer is cooled and shaped and formed on the surface of the lithium metal layer. Alloy layer 2 to obtain a lithium metal composite strip;

[0069] The winding mechanism 60 is used for winding the obtained lit...

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PUM

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Abstract

The invention discloses a lithium metal composite strip for inhibiting dendrite growth. The strip comprises a lithium metal strip, the lithium metal strip comprises a lithium metal layer, and a lithium alloy layer for inhibiting lithium dendrite is arranged on the lithium metal layer. The invention further discloses an energy storage device, the energy storage device comprises a positive electrodeand a negative electrode, an electronically insulated and ion-conducting electrolyte is arranged between the positive electrode and the negative electrode, and the positive electrode and / or the negative electrode are / is made of the lithium metal composite strip. The invention further discloses production equipment of the lithium metal composite strip capable of inhibiting dendritic crystal growth. The equipment comprises: an unwinding mechanism which is used for winding metal bands; a coating section which is used for coating the surface of the lithium metal layer with the liquid lithium alloy layer, and the shaping section is internally provided with a cooling device, so that the liquid lithium alloy layer is cooled and shaped, the lithium alloy layer is formed on the surface of the lithium metal layer, and a lithium metal composite strip is obtained; and a winding mechanism which is used for winding the obtained lithium metal composite strip.

Description

technical field [0001] The invention relates to the technical field of energy storage equipment, in particular to a lithium metal composite strip that inhibits dendrite growth, its production equipment, and an energy storage device. Background technique [0002] Li dendrite growth is one of the fundamental issues affecting the safety and stability of Li-ion batteries. The growth of lithium dendrites will lead to the instability of the electrode and electrolyte interface during the cycle of lithium-ion batteries, destroying the generated solid electrolyte interface (SEI) film, and the growth of lithium dendrites will continue to consume the electrolyte and lead to metal lithium The irreversible deposition of dead lithium leads to low coulombic efficiency; the formation of lithium dendrites can even pierce the diaphragm and cause short-circuiting inside the lithium-ion battery, causing thermal runaway of the battery to cause combustion and explosion. [0003] The Chinese pate...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M10/0525C23C4/08C23C4/123C23C26/02
CPCC23C4/08C23C26/02C23C4/123H01M4/662H01M4/667H01M10/0525Y02E60/10
Inventor 李长明辛民昌吴超辛程勋
Owner QINGDAO NINEX NEW ENERGY TECH CO LTD
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