Lithium metal battery

A lithium metal battery, lithium aluminum alloy technology, applied in the direction of lithium batteries, secondary batteries, battery electrodes, etc., can solve the problems that hinder the commercialization of lithium metal batteries, reduce battery cycle performance, and increase electrolyte consumption, so as to improve safety properties and stability, suppress side reactions, improve uniformity and compactness

Active Publication Date: 2020-11-10
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the deposition process of lithium ions, due to the uneven deposition, a series of problems will be caused, such as the volume expansion of the lithium metal negative electrode during the charge and discharge process, which will lead to increased consumption of the electrolyte, thereby reducing the cycle performance of the battery; The non-densification of metal deposition will lead to the growth of dendrites of deposited lithium during cycling, which will cause safety problems such as fire in severe cases
This severely hampers the commercialization of lithium metal batteries

Method used

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Examples

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preparation example Construction

[0063] The preparation method of the lithium metal battery of the present invention is as follows. After the positive electrode, the negative electrode, the separator and the electrolyte are packaged, the lithium metal battery is obtained.

[0064] Specifically, the preparation method provided by the present invention is the same as the preparation method of conventional lithium metal batteries. For example, the positive electrode, negative electrode, separator and electrolyte provided by the present invention can be used to make a wound lithium metal battery or a laminated lithium metal battery. .

[0065] The invention provides that the lithium ion battery can be used in electrical equipment, and the electrical equipment includes the lithium metal battery of the invention.

[0066] Wherein, the electric device may be, for example, a new energy vehicle, an electronic device, an electric tool, an electric energy storage facility, and the like.

Embodiment 1

[0069] The present embodiment is a kind of lithium metal battery, and its structure is as follows:

[0070] Positive electrode: including aluminum foil and a positive electrode material layer coated on the surface of the aluminum foil, the positive electrode material layer is composed of positive electrode active material LiNi with a weight ratio of 97:2:1 0.8 mn 0.1 co 0.1 o 2 (NCM811), conductive agent carbon black SP, binder polyvinylidene fluoride mixed;

[0071] Negative electrode: including aluminum foil and a lithium aluminum alloy layer compounded on the surface of the aluminum foil, the weight percentage of aluminum in the lithium aluminum alloy layer is 0.1%, and the thickness of the lithium aluminum alloy layer is 20 μm;

[0072] Isolation film: polyimide isolation film;

[0073] Electrolyte: including electrolyte and solvent, wherein the solvent is a combination of ethylene carbonate EC and dimethyl carbonate DMC with a mass ratio of 3:7, the electrolyte is LiF...

Embodiment 2-6

[0076] Examples 2-6 are respectively a lithium metal battery. The difference between them and Example 1 is that the aluminum content in the lithium-aluminum alloy layer is different, and the rest are the same as Example 1. The specific composition is shown in Table 1.

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Abstract

The invention provides a lithium metal battery, and relates to the field of batteries. The lithium metal battery comprises a positive electrode, a negative electrode, an isolating membrane arranged between the positive electrode and the negative electrode, and electrolyte infiltrating the isolating membrane. The negative electrode comprises a negative electrode current collector and a lithium-aluminum alloy layer compounded on the surface of at least one side of the negative electrode current collector; and the electrolyte comprises an electrolyte and a solvent, the solvent contains a film-forming agent, and the film-forming agent is FEC and / or DFEC. According to the lithium metal battery, the problems of poor cycle performance and poor safety performance of the existing lithium metal battery can be solved, so that the lithium metal battery with good cycle performance and good safety performance is provided.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a lithium metal battery. Background technique [0002] Lithium-ion batteries (LIBs for short) are widely used in the field of electronic products due to their advantages such as high voltage, high specific energy, and long cycle life. With the increasing demand for energy storage of new energy vehicles, wind energy, solar energy, etc., the requirements for lithium-ion batteries are also increasing. The current commercial lithium-ion batteries are gradually unable to meet the energy storage needs. [0003] Due to the extremely high theoretical specific capacity (3860mAh / g) and extremely low electrochemical potential of lithium metal, lithium metal batteries (LMBs for short) with lithium metal as the anode have extremely high theoretical energy density. Therefore, lithium metal batteries are One of the most promising next-generation high-energy-density storage devices to meet the stringen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M4/40H01M10/0569H01M10/42
CPCH01M10/052H01M4/405H01M10/0569H01M10/4235H01M2300/0037H01M2300/004Y02E60/10H01M10/0568H01M4/134H01M4/463H01M10/0567H01M50/209H01M4/661H01M10/0525
Inventor 程萌刘成勇胡波兵郭永胜付佳玮李谦梁成都
Owner CONTEMPORARY AMPEREX TECH CO
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