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Lithium metal battery

A lithium metal battery and lithium metal technology, applied in lithium batteries, secondary batteries, battery electrodes, etc., can solve problems such as uneven lithium deposition/dissolution, reduced battery cycle performance, safety issues, etc., to improve cycle stability and safety performance, improved lithium deposition/dissolution uniformity, good strength and elasticity

Active Publication Date: 2020-06-23
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the main reason that limits the further development and application of lithium secondary batteries is that the lithium deposition / dissolution is uneven during the cycle, and lithium dendrites are easy to form, leading to battery short circuits and causing safety problems; and the existence of lithium dendrites is greatly reduced. cycle performance of the battery

Method used

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Examples

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preparation example Construction

[0063] In the preparation method of the lithium metal battery provided by the present invention, the provided protective layer can also include a ceramic material, and the ceramic material can usually be uniformly dispersed in the solution in a suspended manner, so that the protective layer can Disperse evenly.

[0064] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0065] It should be noted that the process equipment or devices not specifically indicated in the following examples all ad...

Embodiment 1

[0068] Preparation of positive electrode sheet: the positive active material LiCoO 2 , the conductive agent acetylene black, and the binder PVDF are mixed according to the mass ratio of 96:2:2, and the solvent NMP is added to stir until the system is uniform to obtain the positive electrode slurry; the positive electrode slurry is evenly coated on the aluminum foil of the positive electrode current collector, After drying at room temperature, transfer to an oven to continue drying, and then cut into discs with a diameter of Φ14mm as the positive electrode sheet, and the capacity of the positive electrode surface is 3mAh / cm 2 .

[0069] Negative pole piece preparation:

[0070] (1) Preparation of polymer solution: polymer X selects the copolymer of polymer Z and polymer W for use, polymer Z selects styrene for use, and molecular weight is 104g / mol, and polymer W selects polybutylacrylate for use, and molecular weight is 128g / mol mol;

[0071] Polymer Y is made of PVDF with a...

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Abstract

The invention relates to the field of battery materials, and particularly relates to a lithium metal battery. The lithium metal battery provided by the invention comprises a lithium metal negative electrode and a protective layer located on the lithium metal negative electrode, wherein the protective layer comprises a polymer Y, a polymer Z and a polymer W; the polymer Y is selected from one or more of polyvinylidene fluoride and polyvinylidene fluoride-hexafluoropropylene, the polymer Z is selected from one or more of polytetrafluoroethylene or a compound shown in a formula I, and the polymerW is selected from one or more of a compound shown in a formula II and / or a compound shown in a formula III. According to the lithium metal battery provided by the invention, an interpenetrating network structure can be formed through a chain entanglement effect between two or more polymers, so that a polymer protection layer is formed on the surface of the lithium negative electrode, the formedprotection layer can realize uniform deposition and dissolution of lithium during high-current charging and discharging, and meanwhile, excessive side reaction between the lithium negative electrode and an electrolyte is inhibited.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a lithium metal battery. Background technique [0002] At present, secondary batteries have been widely used in mobile phones, notebooks, unmanned aerial vehicles, consumer electronics products and as a power source for vehicles. The upper limit of the energy density of commercial lithium-ion batteries based on the graphite anode structure is about 270Wh / kg, and it is difficult to greatly increase the energy density of lithium-ion batteries by treating graphite. The theoretical specific capacity of metal lithium is as high as 3860mAh / g, and the electrode potential is as low as -3.04V (vs.H 2 / H + ), which helps the energy density of the battery system reach 500Wh / kg, so the development of lithium secondary batteries with metal lithium as the negative electrode has once again attracted the attention of scientific researchers. [0003] However, the main reason that limits the fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/134H01M10/052H01M10/42
CPCH01M4/628H01M4/134H01M10/052H01M10/4235Y02E60/10H01M4/366H01M4/382H01M4/622H01M4/623H01M2004/027H01M2300/0082H01M4/62
Inventor 李丽红刘成勇
Owner CONTEMPORARY AMPEREX TECH CO
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