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A modified lithium battery negative electrode and its preparation method and application

A lithium battery and modification technology, which is applied in the direction of battery electrodes, lithium batteries, active material electrodes, etc., can solve the problem that the interface performance between the coating and metal lithium cannot be well guaranteed, limiting the stable cycle of metal lithium, and the volume expansion of metal lithium, etc. problem, to achieve the effect of realizing dendrite-free deposition, improving the bonding interface, and enhancing the interface bonding force

Active Publication Date: 2022-03-22
北京金羽新材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above scheme, the introduction of an effective coating may reduce the performance of lithium metal and the volume expansion of lithium metal during charge and discharge, resulting in the interface performance between the coating and lithium metal cannot be well guaranteed
In addition, the coating may dissolve into the electrolyte system, causing more side reactions, which greatly limit the stable circulation of lithium metal.
Therefore, under the premise of not affecting the performance of lithium metal, no good solution has been proposed to effectively prepare a negative electrode coating that can stabilize lithium metal in the air and ensure a good interface between the two. Battery energy density remains a challenge

Method used

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  • A modified lithium battery negative electrode and its preparation method and application
  • A modified lithium battery negative electrode and its preparation method and application
  • A modified lithium battery negative electrode and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] 1. In an argon atmosphere (both water and oxygen content is less than 0.1ppm), take polyanionic polymer sodium polystyrene sulfonate and dissolve it in diethyl carbonate, prepare it into a 3mol / L solution, and then take a 50μm thick The lithium foil was soaked in the above solution to make the metal lithium surface bear a certain amount of negative charge. The soaking time was 30 minutes. After taking it out, it was washed with diethyl carbonate and dried at 40°C for 10 hours to obtain a modified lithium layer.

[0096] 2. In an argon atmosphere (both water and oxygen content is less than 0.1ppm), take 5g of fluorosilicone resin (molecular weight: 1513), then add 10ml of triethyl phosphate to dilute it 10 times, stir magnetically for 60min, add 2g of Tetraethyl orthosilicate (TEOS), mixed with magnetic stirring until uniform, to obtain modified fluorosilicone resin. Dissolve PVDF in NMP and disperse, stir well for 1 hour, then add carbon nanotubes and modified fluorosil...

Embodiment 2

[0100] Step 1 and step 2 are identical with embodiment 1;

[0101] 3. In an argon atmosphere (both water and oxygen content is less than 0.1ppm), the two sides of the secondary modified fluorosilicone resin layer obtained above are coated with polycationic polymer polydiallyl dimethyl ammonium chloride, and one side is The polycation layer has a thickness of about 1 micron, and is dried at 60° C. for 6 hours to obtain a modified fluorosilicone resin layer.

[0102] 4. In an argon atmosphere (both water and oxygen content is less than 0.1ppm), two layers of modified fluorosilicone resin layers are laminated on the surface of the modified lithium layer to form a sandwich structure, that is, modified fluorosilicone resin layer-modified lithium Layer-modified fluorosilicone resin layer; wherein, the polyanion layer and the polycation layer are in contact, the pressure is 10MPa, and the time is 10s to obtain a modified lithium battery negative electrode with a structure such as f...

Embodiment 3

[0104] 1. In an argon atmosphere (both water and oxygen content is less than 0.1ppm), take polyanionic polymer sodium polystyrene sulfonate and dissolve it in dimethyl carbonate, and prepare it into a 2mol / L solution, and then take 100μm The lithium foil is soaked in the above solution, so that the surface of metal lithium has a certain amount of negative charge. The soaking time is 100min. After taking it out, it is washed with dimethyl carbonate and dried at 30°C for 24h to obtain a modified lithium layer.

[0105] 2. In an argon atmosphere (both water and oxygen content is less than 0.1ppm), take 3g of fluorosilicone resin (molecular weight is 5000), then add 8ml of triethyl phosphate to dilute it 8 times, stir it magnetically for 40min, add 2g of fluorosilicone resin TEOS, mixed with magnetic stirring until uniform, to obtain modified fluorosilicone resin. Dissolve PVDF in NMP and disperse, stir well for 1 hour, then add carbon nanotubes and modified fluorosilicone resin r...

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Abstract

The application provides a modified lithium battery negative electrode and its preparation method and application, including a modified lithium layer and a modified fluorosilicone resin layer; the modified lithium layer includes a lithium metal layer and a polyanion layer; At least one side of the layer is provided with a polyanion layer; the modified fluorosilicone resin layer includes a secondary modified fluorosilicone resin layer and a polycation layer; at least one side of the secondary modified fluorosilicone resin layer is provided with a polycation layer layer; the polyanion layer and the polycation layer are combined by the attractive force of positive and negative charges. The modified lithium battery negative electrode of the present application can suppress the generation of lithium dendrites and make lithium metal exist stably in the air, which greatly improves the processing performance of lithium metal, and the preparation process is simple and large-scale production can be realized.

Description

technical field [0001] The present application relates to the field of battery technology, in particular to a modified lithium battery negative electrode and its preparation method and application. Background technique [0002] Lithium due to its high theoretical specific capacity (3860 mAh g -1 ) and extremely low potential (-3.040 V) and lighter weight, when applied to the anode of lithium batteries, will greatly increase the energy density of the battery, and is considered to be a very promising next-generation battery anode material. However, lithium has extremely high reactivity. During charging and discharging, due to electrochemical deposition / stripping, it may lead to interface instability and lithium dendrite growth, which may pierce the battery separator and cause a short circuit between the positive and negative electrodes, resulting in battery failure or even explode. In addition, another factor that limits the use of lithium anode is its instability in the air...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/36H01M4/38H01M4/40H01M4/62H01M10/052
CPCH01M4/134H01M4/1395H01M4/366H01M4/382H01M4/405H01M4/62H01M4/628H01M10/052H01M2004/027Y02E60/10
Inventor 李爱军邬金龙黄杜斌杨扬王春源
Owner 北京金羽新材科技有限公司
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