A lithium-supplemented electrode of a negative electrode of a lithium ion battery and a preparation method thereo

An electrode and negative electrode technology, applied in the field of lithium ion battery negative electrode supplementary lithium electrode and its preparation, can solve the problems of poor processing performance and safety performance of the pole piece, and achieve the effects of reducing battery processing difficulty, reducing danger, and reducing the risk factor

Inactive Publication Date: 2018-12-28
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the electrode is pre-lithiated, the lithium activity in the electrode or on the surface is high, and it is very easy to chemically

Method used

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  • A lithium-supplemented electrode of a negative electrode of a lithium ion battery and a preparation method thereo
  • A lithium-supplemented electrode of a negative electrode of a lithium ion battery and a preparation method thereo
  • A lithium-supplemented electrode of a negative electrode of a lithium ion battery and a preparation method thereo

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] Example 1

[0035] The specific preparation steps of the negative lithium supplement electrode in this embodiment are as follows:

[0036] (1) Use a vapor deposition apparatus fixture to fix the prepared silicon-based negative pole piece, place it on the top of the deposition apparatus, use a pure lithium belt as the evaporation lithium source, perform vapor deposition at 600 ℃, and fill it with Ar gas. After cooling down, take out the pole piece to make a pre-lithium electrode;

[0037] (2) Add 200g of lithium bisoxalate borate to 600g of acetone solvent, and use mechanical stirring for 6 hours to make a coating solution for use;

[0038] (3) Use an extrusion coater to coat in the drying room, adjust the coating thickness, apply the coating solution to the deposited pre-lithium electrode, and place it under vacuum drying at 80°C. Pre-lithium electrode Repeat the above-mentioned coating and drying process on the other side to obtain a negative lithium supplement electrode with...

Example Embodiment

[0039] Example 2

[0040] The specific preparation steps of the negative lithium supplement electrode in this embodiment are as follows:

[0041] (1) Adopt the direct mixing method to directly add passivated lithium powder to the slurry to prepare tin-based negative electrode slurry, and then coat to prepare a pre-lithium electrode;

[0042] (2) Add 150g of lithium difluorooxalate and 50g of lithium bisfluorosulfonimide to 400g of diethyl carbonate solvent, stir with a machine for 5 hours to prepare a coating solution for use;

[0043] (3) Use an extrusion coater to coat in the drying room, adjust the coating thickness, apply the coating solution to one side of the pre-lithium electrode, and place it under vacuum drying at 45°C. Pre-lithium electrode on the other side The coating and drying process was repeated to obtain a negative lithium supplement electrode with an organic thin film layer thickness of 1 μm.

Example Embodiment

[0044] Example 3

[0045] The specific preparation steps of the negative lithium supplement electrode in this embodiment are as follows:

[0046] (1) The electrochemical pre-lithium method is used to directly connect the pure lithium-lithium belt with the prepared graphite negative electrode and place it in the lithium salt solution to prepare the pre-lithium electrode;

[0047] (2) Add 100g of lithium tetrafluoroborate and 50g of lithium difluorooxalate to 500g of ethylene carbonate solvent, use mechanical stirring for 6 hours to make a coating solution for use;

[0048] (3) Use an extrusion coater to coat in the drying room, adjust the thickness of the coating, apply the coating solution to one side of the pre-lithium electrode, and place it under vacuum drying at 120°C. Pre-lithium electrode on the other side Repeating the above coating and drying process, the organic thin film layer thickness is 5 μm, and the negative lithium supplement electrode is prepared.

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Abstract

The invention discloses a lithium-supplemented electrode of a negative electrode of a lithium ion battery and a preparation method thereof, wherein the lithium-supplemented electrode with the negativeelectrode material or the electrode sheet being pre-lithium treated is coated with an organic thin film layer on the surface of the pre-lithium electrode, and the organic thin film layer is composedof an electrolyte lithium salt dissolved in an organic solvent. The organic coating liquid is prepared by coating electrolyte lithium salt on the surface of the pre-lithium electrode, forming an organic thin film layer on the surface of the pre-lithium electrode, preventing the pre-lithium layer of the pre-lithium electrode from being oxidized, improving the first efficiency, cycle stability and processing performance of the lithium ion battery, and reducing the influence of the production environment on the lithium supplement electrode.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-replenishing negative electrode of a lithium-ion battery and a preparation method thereof. Background technique [0002] In recent years, the field of new energy has developed rapidly, and the country’s normal requirements for new energy subsidies have gradually become stricter. The rate of increase in the energy density of ordinary lithium-ion batteries has gradually slowed down. battery requirements. The development of lithium supplementation technology has the advantage of increasing the capacity of lithium-ion single cells under the same conditions, and has gradually attracted widespread attention from researchers. [0003] At present, the commonly used negative electrode material graphite is gradually approaching the upper limit of its specific capacity, and it is difficult to make a big breakthrough in the energy density of a single battery in terms...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/133H01M4/134H01M4/1391H01M4/1393H01M4/1395H01M10/0525
CPCH01M4/131H01M4/133H01M4/134H01M4/1391H01M4/1393H01M4/1395H01M10/0525Y02E60/10
Inventor 周勇岐杨立铭杨茂萍王辉
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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