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Lithium supplementing diaphragm of lithium ion battery

A lithium-ion battery and lithium-replenishing technology, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as actual capacity attenuation, etching of negative electrode active layers, etc., to improve efficiency, avoid side reactions, and reduce production. effect of steps

Active Publication Date: 2020-01-10
复阳固态储能科技(溧阳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the strong reducibility of lithium metal, an irreversible chemical reaction will occur when lithium metal contacts the active layer of the negative electrode, which will etch the active layer of the negative electrode and cause the actual capacity to fade.

Method used

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  • Lithium supplementing diaphragm of lithium ion battery
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  • Lithium supplementing diaphragm of lithium ion battery

Examples

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Effect test

Embodiment 1

[0037] A lithium-replenishing diaphragm for a lithium-ion battery, the lithium-replenishing diaphragm includes a plurality of mutually superimposed diaphragm layers, a metal lithium layer is provided on the diaphragm layer, and a protective layer is also provided above the metal lithium layer .

[0038] The diaphragm layer is a single-layer polypropylene diaphragm with a thickness of 20 μm. The protective layer is LiPON with a thickness of 10nm. The thickness of the metallic lithium layer was 3 μm.

[0039] The preparation method of described lithium supplement diaphragm, comprises the steps:

[0040] (1) Place the diaphragm layer in the vacuum chamber, the horizontal distance between the evaporation lithium source and the diaphragm layer is 40cm, and vacuumize until the vacuum degree of the chamber reaches 3*10 -4Below Pa, turn on the cooling water circulation system to ensure that the temperature of the diaphragm layer is controlled at 20-30°C. The physical form of the ev...

Embodiment 2

[0045] A lithium-replenishing diaphragm for a lithium-ion battery, the lithium-replenishing diaphragm includes a plurality of mutually superimposed diaphragm layers, a metal lithium layer is provided on the diaphragm layer, and a protective layer is also provided above the metal lithium layer .

[0046] The diaphragm layer is a single-layer polypropylene diaphragm with a thickness of 20 μm. The protective layer is made of Al with a thickness of 10nm. The thickness of the metallic lithium layer was 3 μm.

[0047] The preparation method of described lithium supplement diaphragm, comprises the steps:

[0048] (1) Place the diaphragm layer in the vacuum chamber, the horizontal distance between the evaporation lithium source and the diaphragm layer is 40cm, and vacuumize until the vacuum degree of the chamber reaches 3*10 -4 Below Pa, and turn on the cooling water circulation system to ensure that the temperature of the diaphragm layer is controlled at 20-30°C. The physical form...

Embodiment 3

[0051] A lithium-replenishing diaphragm for a lithium-ion battery, the lithium-replenishing diaphragm includes a plurality of mutually superimposed diaphragm layers, a metal lithium layer is provided on the diaphragm layer, and a protective layer is also provided above the metal lithium layer .

[0052] The separator layer is a single-layer PP coated with alumina, with a thickness of 40 μm. The protective layer is LiPON with a thickness of 10nm. The thickness of the metallic lithium layer was 3 μm.

[0053] The preparation method of described lithium supplement diaphragm, comprises the steps:

[0054] (1) Place the diaphragm layer in the vacuum chamber, the horizontal distance between the evaporation lithium source and the diaphragm layer is 30cm, and vacuumize until the vacuum degree of the chamber reaches 3*10 -4 Below Pa, and turn on the cooling water circulation system to ensure that the temperature of the diaphragm layer is controlled at 20-30°C. The physical form of t...

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Abstract

The invention provides a lithium supplementing diaphragm of a lithium ion battery. The lithium supplementing diaphragm comprises a plurality of diaphragm layers which are overlapped with one another;a metal lithium layer is arranged on the diaphragm layers; a protective layer is arranged on the metal lithium layer; and the diaphragm layers are polymer films. The lithium supplementing diaphragm ofthe lithium ion battery can be directly used for the pre-lithiation (lithium supplementing) of the negative electrode of the lithium ion battery, so that the first coulombic efficiency and cycle performance of the lithium ion battery are improved; the metal lithium layer is prevented from being etched by electrolyte and environment atmosphere; the metal lithium layer is prevented from irreversibly and chemically reacting with a negative electrode active layer; and the pre-lithiation or lithium supplementing efficiency of the electrode is improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a lithium-supplementing diaphragm of a lithium-ion battery. Background technique [0002] Lithium-ion batteries are widely used in human's daily life as an efficient energy storage device. However, the traditional lithium-ion battery anode material is graphite anode, and its theoretical specific capacity is only 372mAhg -1 , can no longer meet the requirements of high-tech battery systems. Therefore, the development of high-performance and high-capacity anodes is one of the key research directions in this field. Si-based, SiO x Negative electrode materials such as alloys and alloys all have high theoretical specific capacity, but due to the large volume change of this type of negative electrode material during charging and discharging, the electrode interface is very unstable, resulting in low initial Coulombic efficiency of the battery, and Shortcomings such ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/0525
CPCH01M10/0525H01M50/431H01M50/403H01M50/449H01M50/411Y02E60/10
Inventor 李立飞
Owner 复阳固态储能科技(溧阳)有限公司
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