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Electrode with organic-inorganic composite protective layer, its preparation method and application

An inorganic composite and protective layer technology, applied in the direction of electrode manufacturing, battery electrodes, non-aqueous electrolyte battery electrodes, etc., can solve the problems of high raw material costs and difficulty in ensuring the uniformity of the protective layer, and achieve simple preparation methods and large-scale The effect of controllable production and conditions

Active Publication Date: 2020-05-19
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For example, CN104617259A adopts the method of immersing the lithium sheet in the treatment solution to form a silicon dioxide protective layer on the surface of the lithium negative electrode in situ, but the silicon dioxide itself is not conductive, and it is difficult to ensure the uniformity of the protective layer in this way of immersion
[0006] As another example, CN103985840A uses the method of coating to obtain a lithium negative electrode with a conductive polymer functional protective layer, but the raw material cost of this method is relatively high

Method used

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  • Electrode with organic-inorganic composite protective layer, its preparation method and application
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  • Electrode with organic-inorganic composite protective layer, its preparation method and application

Examples

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Effect test

Embodiment 1

[0057] (1) Prepare a treatment solution with a PVDF concentration of 5% (w / v): add polyvinylidene fluoride PVDF into a blue-mouthed bottle of N-methylpyrrolidone NMP and stir well, then place it in an oil bath Continue heating and stirring at 65 ° C for 2 h to obtain a treatment solution.

[0058] (2) Preparation of a lithium sheet with an organic-inorganic composite protective layer: apply the treatment solution obtained in step (1) on the lithium sheet using a wire bar coater (coating thickness of 6 μm) under a high-purity argon atmosphere. Then place the lithium strip in a muffle furnace (argon atmosphere) and heat it at 80° C. for 1 hour to prepare the lithium sheet of the organic-inorganic composite protective layer.

[0059] (3) Assembly and electrochemical performance test of the battery: use a punching die to cut the lithium sheet in step (2) into small discs, add 0.6MLi 2 S n and 0.6MLiNO 3 1M LiTFSI / bis(trifluoromethanesulfonyl)imide lithium, wherein (1,3 dioxolan...

Embodiment 2

[0066] (1) Prepare the treatment solution of PVDF / single-walled carbon nanotube (SWNT) / NMP (wherein PVDF concentration is 5% (w / v), SWNT concentration is 0.5% (w / v): SWNT is dispersed in NMP, Afterwards, use an ultrasonic probe to disperse for 30 minutes, then add PVDF, stir and mix well, and then heat and stir in an oil bath at 65° C. for 2 hours to obtain a treatment solution.

[0067] (2) Preparation of a lithium sheet with an organic-inorganic composite protective layer: apply the treatment solution obtained in step (1) on the lithium sheet using a wire bar coater (coating thickness of 6 μm) under a high-purity argon atmosphere. strip surface, and then place the lithium strip in a muffle furnace (argon atmosphere) and heat it at 80°C for 1 hour to prepare the organic-inorganic composite protective layer lithium sheet.

[0068] (3) Assembly and electrochemical performance test of the battery: use a punching die to cut the lithium sheet in step (2) into small discs, adopt 1M...

Embodiment 3

[0075] (1) Preparation of PVDF / graphene (rGO) / NMP treatment solution (in which the concentration of PVDF is 5% (w / v)): disperse rGO in NMP, use an ultrasonic probe to disperse for 30 minutes, then add PVDF, stir and mix well Heat and stir in an oil bath at 65°C for 2 hours to obtain a treatment solution.

[0076] (2) Preparation of a lithium sheet with an organic-inorganic composite protective layer: apply the treatment solution obtained in step (1) on the lithium sheet using a wire bar coater (coating thickness of 6 μm) under a high-purity argon atmosphere. Then place the lithium strip in a muffle furnace (argon atmosphere) and heat it at 80° C. for 1 hour to prepare the lithium sheet of the organic-inorganic composite protective layer.

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Abstract

The invention discloses an electrode with an organic-inorganic composite protective layer, which comprises a substrate and an organic-inorganic composite protective layer covered on the substrate, and the organic-inorganic composite protective layer contains LiF particles and organic molecular chains. The preparation method of an electrode with an organic-inorganic composite protective layer of the present invention includes: applying the treatment liquid on the substrate, and making the fluorine-containing organic compound react with lithium metal in the substrate, thereby The organic-inorganic composite protective layer is formed on the substrate. The electrode with the organic-inorganic composite protective layer of the present invention maintains a stable structure of the lithium battery before and after the electrochemical cycle, can effectively inhibit the growth of lithium dendrites, and improve the coulombic efficiency of the battery, and the preparation method of the composite protective layer is simple and the conditions are low. It is controllable and convenient for large-scale production, and is applied to metal lithium secondary batteries to improve the cycle performance of the battery.

Description

technical field [0001] The invention relates to an electrode material, in particular to an electrode with an organic-inorganic composite protective layer, its preparation method and application, for example, its application in the preparation of lithium batteries. Background technique [0002] With the rapid development of society, electronic products such as notebook computers, mobile phones, and digital cameras are used more and more widely. At the same time, people have higher and higher requirements for the miniaturization and thinning of various electrical appliances, so there is an urgent need for a high specific energy battery to adapt to this development trend. As the main energy storage device of lithium-ion batteries, the theoretical specific capacity of the negative electrode material graphite is only 372mAh / g, so it is difficult to further improve the specific energy of the battery. So people once again turned their attention to metal lithium anodes. The theore...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/04H01M4/36H01M4/38H01M4/60H01M10/0525
CPCH01M4/0402H01M4/134H01M4/366H01M4/38H01M4/60H01M10/0525Y02E60/10
Inventor 高珊张晓峰卢威吴晓东陈立桅
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI