Modified planar current collector, preparation method thereof, lithium electrode and lithium battery

A planar set and fluid technology, applied in the direction of lithium batteries, electrode carriers/collectors, non-aqueous electrolyte batteries, etc., can solve the problems of large influencing factors and difficulty in preparing thin-layer lithium uniformly, so as to achieve uniform electric field distribution and easy repeatability Homogenized preparation and uniform flux of lithium ions

Inactive Publication Date: 2021-02-23
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the above-mentioned document technology adopts a multi-layer composite structure to vapor-deposit thin-layer lithium, this operation method has a large influence factor, and it is still not easy to uniformly prepare thin-layer lithium.

Method used

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  • Modified planar current collector, preparation method thereof, lithium electrode and lithium battery
  • Modified planar current collector, preparation method thereof, lithium electrode and lithium battery
  • Modified planar current collector, preparation method thereof, lithium electrode and lithium battery

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preparation example Construction

[0035]The isolated heterojunction in the embodiment of the present invention is to achieve prepared, uniform patterned heterojunction as a lithium substance using a template such as a mask plate. Embodiments of the present invention provide a method of preparing a modified planar collector as described above, including the following steps:

[0036]The mask is constructed in the plane of the surface collective heterogeneous lithium region, and the mode of constructing the heterojunction of the pattern can be sputtering, or the simplified manner of plasma etching can also achieve the regulation of the substrate surface energy. To achieve a more uniform and dense deposition.

[0037]In some embodiments of the present invention, the sputtering layer is more lithium properties (such as graphe slurry, gold, silver, tin, or) by a mask plate. Array pattern of metal oxides, etc.).

[0038]Wherein, the reticle is a hollow array template, where a single pattern can be round or square, etc., and the spa...

Embodiment 1

[0045]Through the mask (the pattern is circular), a layer of material that is more lithium-philic than copper foil is sputtered on the copper foil (sputtering vacuum state 4*10-2mbar; the lithium-philic substance selected in Example 1 is gold), the formation is asfigure 1 In the patterned heterojunction array shown, the distance d between adjacent patterned heterojunctions is 0.5 of the lateral dimension R of the pattern, that isfigure 1 In d / R=0.5. Based on the area ratio of the planar current collector being 1, the area ratio of the patterned heterojunction region is 0.8.

[0046]The obtained patterned current collector is subjected to electrodeposition of lithium to obtain a dense lithium foil with a controllable capacity. At 1mA / cm2The current density is deposited for 1h of lithium deposition for effect comparison, such asfigure 2 Shown.figure 2 On the left is the effect of unmodified current collector lithium deposition, you can see the uneven deposition, as well as the exposed un...

Embodiment 2

[0050]Through the mask (the pattern is circular), a layer of material that is more lithium-philic than copper foil is sputtered on the copper foil (sputtering vacuum state 4*10-2mbar; the lithium-philic substance selected in Example 2 is gold), the formation is asFigure 5 In the patterned heterojunction array shown, the spacing between the patterned heterojunctions is 0.25 of the lateral dimension of the pattern, that isFigure 5 Middle d / R=0.25. Based on the area ratio of the planar current collector being 1, the area ratio of the patterned heterojunction region is 0.8.

[0051]The obtained patterned current collector is subjected to electrodeposition of lithium to obtain a dense lithium foil with a controllable capacity. The difference between this embodiment and embodiment 1 is that the spacing between patterned heterojunctions is 0.25 of the lateral dimension of the pattern, and the lithium deposition effect is as followsFigure 6 As shown, the lithium deposition is more uniform than...

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Abstract

The invention relates to the technical field of lithium batteries, and provides a modified planar current collector, a preparation method thereof, a lithium electrode and a lithium battery. The modified planar current collector comprises a two-dimensional planar substrate and patterned heterojunction arrays constructed on the surface of the two-dimensional planar substrate, and the patterned heterojunction arrays are uniform in shape and have lithium affinity. According to the invention, a uniformly patterned heterojunction lithium-philic region enables the electric field distribution to be more uniform, enables the lithium ion flux to be more uniform, and also improves the wettability of an electrolyte (which can be proved by a contact angle test result). According to the invention, the surface energy of the planar substrate material is adjusted, the wettability with electrolyte is enhanced, uniform and compact lithium deposition can be realized, and the overall energy density is improved. Besides, the modified planar current collector is simple to operate, can be repeated easily and is in uniform preparation; the construction of a ultrathin lithium foil is easy to realize, and the use of excessive lithium of the lithium battery is avoided.

Description

Technical field[0001]The present invention relates to the field of lithium battery, in particular a modified planar collector, a method of preparing a method, and a lithium electrode, a lithium battery.Background technique[0002]In a metal lithium secondary battery, lithium electrode is the main factor affecting electrochemical properties of the battery, and is very important to the study of lithium electrodes. After some studies, an important issue in the application of metal lithium secondary batteries is the lithium branch. Lithium metal is uniformly deposited in the circulation process, resulting in an unlimited volume expansion effect such that the lithium metal body is broken and the substrate is losing good electrical contact, which is premature to turn lithium to a no electrochemically active lithium. In addition, the capacity of lithium is far excessive than the positive electrode, which is also not conducive to the increase in the overall energy density of the battery. Ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/70H01M4/66H01M4/134H01M10/052
CPCH01M4/134H01M4/667H01M4/70H01M10/052Y02E60/10
Inventor 张自博周旭峰刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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