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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 react with water and air in an ordinary environment, and the processing performance and safety performance of the electrode are very poor.

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

Embodiment 1

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

[0036] (1) Use the fixture of the vapor deposition instrument to fix the prepared silicon-based negative electrode sheet, place it on the top of the deposition instrument, use pure lithium lithium ribbon as the evaporation lithium source, perform vapor deposition at 600 °C, and fill it with Ar gas. After cooling down, the pole piece is taken out to obtain a pre-lithium electrode;

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

[0038] (3) Use an extrusion coater to coat in the drying room, adjust the coating thickness, apply the coating solution to one side of the deposited pre-lithium electrode, and place it at 80°C for vacuum drying. The pre-lithium electrode Repeat the above coating and drying process on the other side to obtain an organic th...

Embodiment 2

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

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

[0042] (2) Add 150g of lithium difluorooxalate and 50g of lithium difluorosulfonyl imide into 400g of diethyl carbonate solvent, and stir it mechanically for 5 hours to make a coating solution for later use;

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

Embodiment 3

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

[0046] (1) Using the electrochemical pre-lithium method, directly connect the pure lithium-lithium strip to the prepared graphite negative electrode sheet 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 into 500g of ethylene carbonate solvent, and use mechanical stirring for 6 hours to make a coating solution for later use;

[0048] (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 at 120°C for vacuum drying, and the other side of the pre-lithium electrode The above coating and drying process was repeated to obtain a negative lithium-replenishing electrode with an organic thin film layer thickness of 5 μm.

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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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