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High-security metallic lithium cathode and preparation method thereof

A high-safety, metal lithium technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as failure to meet practical standards, deterioration of electrochemical performance, capacity loss, etc., to improve battery rate charge and discharge capacity and use Longevity, prevention of lithium dendrites, and performance improvement effects

Active Publication Date: 2015-10-07
李震祺 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to suppress the formation of lithium dendrites in the lithium metal negative electrode during the charge-discharge cycle, researchers have done a lot of research, mainly focusing on the surface modification of the negative electrode lithium, and most of them use electrolyte additives to modify the surface properties of the lithium negative electrode. ; but this single modification effect can not meet the practical standard, and it is easy to cause capacity loss, internal resistance increase, electrochemical performance deterioration and other disadvantages

Method used

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  • High-security metallic lithium cathode and preparation method thereof
  • High-security metallic lithium cathode and preparation method thereof

Examples

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Embodiment 1

[0039] Such as figure 1 with figure 2 As shown, a high-safety metal lithium negative electrode includes a lithium powder porous electrode 2 and a silicon-based protective layer 1, and also includes a negative electrode tab; the lithium powder porous electrode 2 includes a lithium powder material layer 21 and a copper foil 22, The lithium powder porous electrode 2 is formed by mixing the lithium powder and the binder PVDF in a tetrahydrofuran solvent, coating it on the copper foil 22, and forming it through sheeting; the silicon-based protective layer 1 is formed by vacuum coating The silicon-based material is vapor-deposited on the lithium powder material layer 21, and the thickness of the silicon-based protective layer 1 is 0.02-0.2 μm.

[0040] Such as figure 2 As shown, since the lithium powder porous electrode 2 is a powder porous electrode, when the silicon-based protective layer 1 adopts the vacuum coating method to vapor-deposit silicon-based materials on the lithiu...

Embodiment 2

[0045] On the basis of Example 1, the structure of the high-safety metal lithium negative electrode in this example is the same as that in Example 1, only the preparation method is different. In this example, the following steps are used to prepare:

[0046] Stir the mixture of molten lithium metal and 250°C hot silicone oil at 30,000 rpm at high speed to form a dispersion system, cool to room temperature to obtain lithium metal powder, wash three times with cyclohexane and dry at room temperature to obtain lithium metal powder with a particle size of 18-30 μm; The mass ratio of metal lithium powder and binder PVDF is 80:20. Weigh the prepared metal lithium powder and binder PVDF respectively, and inject tetrahydrofuran 2.0 times the mass of metal lithium powder and binder PVDF solid powder into vacuum Stirring machine, stirring for 4h to mix the slurry, coating on the pre-treated copper foil, drying, tableting to prepare the lithium powder porous electrode 2; put the silicon-b...

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Abstract

The invention provides a high-security metallic lithium cathode and a preparation method thereof. The high-safety metallic lithium cathode comprises a lithium powder porous electrode and a silicon-based protecting layer, wherein the silicon-based protecting layer is arranged on the lithium powder porous electrode in an evaporation manner; the silicon-based protecting layer is 0.02-0.2 micrometers thick. Through the adoption of the technical scheme, the silicon-based protecting film with a lithium storage function is arranged on the metal lithium powder electrode in the evaporation manner, so that the security of the metallic lithium cathode is greatly improved; the high-security metallic lithium has relatively high current density and relatively small inner resistance; meanwhile, the cycle efficiency is improved, and a development space is provided for application of the metallic lithium cathode in the field of high-energy batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, relates to a high-safety metallic lithium negative electrode and a preparation method thereof, in particular to a high-safety and high-performance metallic lithium negative electrode and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of large energy storage, no pollution, and light weight, and have been widely used in portable electronic devices, power tools and other fields. However, there are still some development bottlenecks in large-scale battery applications such as electric vehicles and energy storage: use safety, cycle life, energy density, etc. [0003] Lithium-ion batteries use graphite as the negative electrode, and the theoretical capacity of graphite-based negative electrodes is 375mAh / g, which cannot meet the needs of high-energy lithium-ion batteries. Compared with graphite-based negative electrodes, metallic lithium...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M2/16H01M2/14H01M4/1395
CPCH01M4/134H01M4/1395H01M50/403H01M50/431Y02E60/10
Inventor 李震祺刘立君宋翠环
Owner 李震祺
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