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Composite electrolyte membrane, lithium metal battery and preparation method of composite electrolyte membrane

A composite electrolyte membrane and solid electrolyte technology, which is applied in the preparation of lithium metal batteries and composite electrolyte membranes, and in the field of composite electrolyte membranes, can solve problems such as reducing the cycle performance of lithium metal batteries, reducing the high-voltage resistance of electrolytes, and short-circuiting lithium metal batteries. , to achieve the effect of ensuring high pressure resistance, good applicability, and a wide range of applications

Pending Publication Date: 2021-12-07
ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the presence of lithium metal, lithium metal batteries will generate lithium dendrites on the surface of their negative electrodes during the cycle charge-discharge process, which may cause a short circuit of the lithium metal battery and greatly reduce the cycle performance of the lithium metal battery.
[0003] Lithium nitrate (LiNO 3 ) as an excellent electrolyte additive, although it can form a lithium nitride protective layer through reduction and decomposition on the negative electrode surface of lithium metal batteries, which can effectively inhibit the growth of lithium dendrites and improve the cycle performance of lithium metal batteries, but because of its The solubility in conventional carbonate electrolytes is poor, which greatly limits its application range
[0004] Similarly, lithium difluorophosphate (LiPO 2 f 2 ) as a positive electrode film-forming additive, although it can form a protective layer by oxidation and decomposition on the surface of the positive electrode of lithium metal batteries, which can effectively inhibit the growth of lithium dendrites and improve the cycle performance of lithium metal batteries, but due to its presence in conventional carbonate electrolysis Poor solubility in liquid, which greatly limits its scope of application
[0005] Although lithium nitrate and lithium difluorophosphate have good solubility in ether solvents, the use of ether solvents will greatly reduce the high-voltage resistance of the electrolyte and limit its compatibility with high-voltage cathode materials

Method used

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  • Composite electrolyte membrane, lithium metal battery and preparation method of composite electrolyte membrane
  • Composite electrolyte membrane, lithium metal battery and preparation method of composite electrolyte membrane
  • Composite electrolyte membrane, lithium metal battery and preparation method of composite electrolyte membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Such as figure 1As shown, a composite electrolyte membrane includes an intermediate layer 1, the intermediate layer 1 is a solid electrolyte or a diaphragm, and the side of the intermediate layer 1 used to connect with the positive electrode sheet has a first coating layer 11, and the first coating layer 11 is formed by the first The slurry is coated and dried, and the first slurry includes a first resin containing difluorophosphate, a first polymer binder and a first organic solvent.

[0056] In this embodiment, the first resin accounts for 3-20% by weight of the first slurry, and the first polymer binder accounts for 1-10% by weight of the first slurry.

[0057] In this embodiment, the first polymer binder is one or more of polyvinylidene fluoride (PVDF), polyethylene, polyvinylidene chloride, polypropylene, and polyacrylonitrile, and the first organic solvent is NMP , acetone, DMF and DMSO in one or more.

[0058] The method for making the above-mentioned composite...

Embodiment 2

[0066] Such as figure 2 As shown, a composite electrolyte membrane includes an intermediate layer 1, the intermediate layer 1 is a solid electrolyte or a diaphragm, and the side of the intermediate layer 1 used to connect with the negative electrode sheet has a second coating layer 12, and the second coating layer 12 is composed of a second The slurry is formed after being coated and dried, and the second slurry includes a second resin containing nitrate, a second polymer binder and a second organic solvent.

[0067] In this embodiment, the second resin accounts for 3-20% by weight of the second slurry, and the second polymer binder accounts for 1-10% by weight of the second slurry.

[0068] In this embodiment, the second polymer binder is one or more of polyvinylidene fluoride, polyethylene, polyvinylidene chloride, polypropylene, and polyacrylonitrile, and the second organic solvent is NMP, acetone, One or more of DMF and DMSO.

[0069] The method for making the above-men...

Embodiment 3

[0077] Such as image 3 As shown, a composite electrolyte membrane includes an intermediate layer 1, the intermediate layer 1 is a solid electrolyte or a diaphragm, the side of the intermediate layer 1 used to connect with the positive electrode sheet has a first coating layer 11, and the intermediate layer 1 is used to connect with the negative electrode sheet One side of the connection has a second dressing layer 12, the first dressing layer 11 is formed by drying the first slurry after coating, the first slurry includes the first resin containing difluorophosphate, the first polymer binder and The first organic solvent, the second dressing layer 12 is formed by drying the second slurry after coating, and the second slurry includes a second resin containing nitrate, a second polymer binder and a second organic solvent.

[0078] In this embodiment, the first resin accounts for 3-20% of the first slurry by weight, the first polymer binder accounts for 1-10% of the first slurry...

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Abstract

The invention belongs to the technical field of battery manufacturing, and discloses a composite electrolyte membrane, a lithium metal battery and a preparation method of the composite electrolyte membrane. The composite electrolyte membrane comprises a middle layer which is a solid electrolyte or a diaphragm. A first dressing layer is arranged on the side, used for being connected with a positive plate, of the middle layer and / or a second dressing layer is arranged on the side, used for being connected with a negative plate, of the middle layer, and the first dressing layer is formed by coating first slurry and then drying; and the first dressing layer is formed by coating first slurry, the first slurry comprises first resin containing difluorophosphate radicals, a first polymer binder and a first organic solvent, the second dressing layer is formed by coating and drying second slurry, and the second slurry comprises second resin containing nitrate radicals, a second polymer binder and a second organic solvent. The cycle performance of the lithium metal battery can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of battery manufacturing, in particular to a composite electrolyte membrane, a lithium metal battery and a preparation method for the composite electrolyte membrane. Background technique [0002] Lithium metal battery is a rechargeable battery with lithium metal as the negative electrode. Its energy density is much higher than that of conventional lithium ion batteries with graphite or silicon carbon as the negative electrode, and it has extremely high development potential. However, due to the presence of lithium metal, lithium metal dendrites will be generated on the surface of the negative electrode during the cycle charge and discharge process of lithium metal batteries, which may cause short circuit of lithium metal batteries and greatly reduce the cycle performance of lithium metal batteries. [0003] Lithium nitrate (LiNO 3 ) as an excellent electrolyte additive, although it can form a lithium nitrid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0565H01M10/058H01M10/0525Y02E60/10Y02P70/50
Inventor 许晓雄葛佳文崔言明黄园桥詹盼戈志敏
Owner ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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