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Lithium supplementing slurry as well as preparation method and application thereof

A lithium supplementation and slurry technology, which is applied in the field of lithium supplementation slurry and its preparation, can solve the problems of high price, high safety, and complicated preparation methods, and achieve the effects of low cost, high safety, and good compatibility

Inactive Publication Date: 2019-10-18
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this invention also has big problems, such as n-butyllithium and tert-butyllithium used are highly flammable and explosive dangerous goods, which will ignite when exposed to air, and the safety is not higher than lithium powder. It needs to be carried out under a completely inert atmosphere, the process is cumbersome and the cost is high
[0007] It has been reported in the literature that the use of Li 2 O is used as a lithium supplementary material, but Li 2 The activity of O is low, and it needs to be catalyzed by adding Co. After catalysis, its capacity for lithium supplementation in the first week is only 600mAh / g. At the same time, its preparation method is complicated and requires Co 3 o 4 Reacts with molten lithium to form Li 2 O / Co
In addition, the price of Co is relatively expensive, which will increase its cost, and the dissolution of Co in lithium-ion batteries will also cause battery failure, resulting in rapid capacity decay

Method used

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  • Lithium supplementing slurry as well as preparation method and application thereof
  • Lithium supplementing slurry as well as preparation method and application thereof
  • Lithium supplementing slurry as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Preparation of lithium peroxide particles

[0031] Take 21g lithium hydroxide monohydrate (LiOH·H 2 O) be dissolved in 160ml of water, when the dissolution is complete, keep stirring, while slowly adding 70ml of hydrogen peroxide (H 2 o 2 , 30wt%), continue to stir for 30min, add 100ml of ethanol and filter with suction, then vacuum at 150°C for 2h to obtain lithium peroxide.

Embodiment 2

[0033] Preparation of lithium supplement slurry of the present invention

[0034] Get 46g NMP, add 1g polyvinylidene fluoride (PVDF) wherein, keep stirring, until it dissolves completely, add 5g Denka black (Dk) again, keep stirring 30min, finally add the lithium peroxide that 4g embodiment 1 makes, continue Stir for 30 minutes until a slurry is formed, which is recorded as A1.

[0035] Take 35g of NMP, add 0.5g of polyvinylidene fluoride into it, keep stirring until it is completely dissolved, then add 1g of Denka black (Dk), keep stirring for 30min, finally add 3.5g of lithium peroxide prepared in Example 1, and continue stirring for 30min , until the slurry is formed, denoted as A2.

[0036] Take 7g of NMP, add 1g of polyvinylidene fluoride into it, keep stirring until it is completely dissolved, then add 1g of Denkablack (Dk), keep stirring for 30min, finally add 3g of lithium peroxide prepared in Example 1, and continue stirring for 30min until A slurry is formed, denot...

Embodiment 3

[0041] Preparation of Li 2 o 2 Slurry cathode sheet

[0042] The slurries A1-A6 were evenly coated on the aluminum foil current collector, and dried at 55°C. The pole pieces were cut into discs with a diameter of φ14mm, placed in a vacuum oven at 120°C for 6 hours, and cooled naturally. Take them out and place them in the glove box as the positive pole pieces, which are respectively marked as B1-B6.

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Abstract

The invention provides a lithium supplementing slurry for supplementing active lithium in a lithium energy storage device as well as a preparation method and application of the lithium supplementing slurry; the lithium supplementing slurry comprises a lithium supplementing material, a liquid dispersing agent, an optional conducting material and an optional binding agent, wherein the lithium supplementing material is lithium peroxide. The lithium supplementing slurry provided by the invention is stable in air, simple to prepare, high in safety and low in cost. In addition, the lithium supplementing slurry is high in compatibility with various positive electrode materials, negative electrode materials and electrolytes of the lithium ion energy storage device, so that the lithium supplementing slurry is very suitable for various lithium ion energy storage devices.

Description

technical field [0001] The invention belongs to the field of lithium-ion energy storage appliances, and in particular relates to a lithium supplement slurry and its preparation method and application. Background technique [0002] Due to its high discharge voltage, high energy density and long cycle life, lithium-ion energy storage devices have been widely used in various small portable electronic devices, such as notebook computers, mobile phones and cameras, and are also It is gradually favored by high-tech fields, such as deep-sea submarines, space satellites and military equipment. [0003] Known commercial electrolytes are generally carbonate electrolytes such as ethylene carbonate (EC), dimethyl carbonate (DMC) and vinylene carbonate (VC), and lithium-ion energy storage devices are charged for the first time in these electrolytes. Among them, a solid electrolyte film (SEI film) is formed on the surface of the negative electrode material, and the main components of the...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/623H01M4/625H01M10/0525Y02E60/10
Inventor 詹元杰黄学杰
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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