Lithium metal battery with in-situ repairing function, preparation method and repairing method

A lithium metal battery, in-situ repair technology, used in lithium batteries, secondary battery repair/maintenance, secondary batteries, etc., can solve problems such as moisture absorption and precipitation of nitrates from large particles, and achieve improved cycle performance and strength. and electrical conductivity, easy-to-achieve effects

Pending Publication Date: 2022-04-22
ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the electrolyte membrane and microcapsule technology, the microcapsules are released in the battery under controllable heating at a certain temperature, so that a large amount of additive RbNO is introduced into the battery preparation process. 3 , and controlled release at the right time, promote uniform lithium deposition, realize the repair of lithium negative electrode, and at the same time solve the problems of large particle precipitation at low temperature and nitrate moisture absorption when direct use of additives

Method used

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  • Lithium metal battery with in-situ repairing function, preparation method and repairing method
  • Lithium metal battery with in-situ repairing function, preparation method and repairing method
  • Lithium metal battery with in-situ repairing function, preparation method and repairing method

Examples

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Embodiment 1

[0028] A lithium metal battery with in-situ repair, comprising a positive electrode sheet 1, a negative electrode sheet 2 and an electrolyte membrane 3. The body of the electrolyte membrane 3 is coated with microcapsules 31 on the surface facing the negative electrode sheet. The microcapsules 31 include a capsule shell and a capsule core, and the capsule core is RbNO 3 The capsule shell is at least one of polymer materials such as MUF (formaldehyde-urea-phenolic), polyurea, polyamide, polyurethane, etc., and the capsule shell is preferably polyamide. The particle size of the microcapsules 31 is 0.5 μm to 1 μm, preferably 0.6 μm, 0.7 μm, 0.8 μm, or 0.9 μm.

[0029] A preparation method for a lithium metal battery, comprising the steps of:

[0030] S1, the preparation of microcapsules, the aqueous solution containing polymer material and containing RbNO 3 Stir the toluene solution of the toluene solution evenly to carry out emulsion polymerization, and then successively stand,...

Embodiment 2

[0037] A preparation method for a lithium metal battery, comprising the steps of:

[0038] S1, the preparation of microcapsule 31, select MUF (formaldehyde-urea-phenolic formaldehyde) as polymer material, will contain 30% MUF aqueous solution and contain 1mol / L RbNO 3 Stir the toluene solution in water evenly to carry out emulsion polymerization, then stand, filter, and vacuum-dry in turn to obtain the compound containing RbNO 3 The microcapsule 31; The weight ratio of the capsule core and the capsule shell in the obtained microcapsule 31 is 1:1, and the particle diameter of the microcapsule 31 is 0.8 μm;

[0039] S2. Solvent, binder and microcapsules 31 are configured into a solution according to the mass fraction of 98:1:1, stirred at a speed of 300rmp for 3h, and then the solution containing microcapsules 31 that is stirred evenly is coated on the body of the electrolyte membrane One surface, with a thickness of 2 μm, to obtain a microcapsule modified diaphragm electrolyte...

Embodiment 3

[0044] A preparation method of a lithium metal battery, the difference from Example 2 is that in step S2, NMP, PVDF and microcapsules 31 are configured into a solution in parts by mass of 98:1:1, stirred at a speed of 300rmp for 3h, and then The uniformly stirred solution containing microcapsules 31 is coated on one surface of the electrolyte membrane body with a thickness of 2 μm to obtain a microcapsule modified electrolyte membrane 3 .

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PUM

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Abstract

The invention discloses a lithium metal battery with in-situ repair and a preparation and repair method, the lithium metal battery comprises an electrolyte membrane, one side surface of an electrolyte membrane body is coated with a microcapsule, the microcapsule comprises a capsule shell and a capsule core, the capsule core is RbNO3, and the capsule shell is made of a polymer material. The preparation method comprises the following steps: preparing a solvent, a binder and a microcapsule into a solution according to a ratio after the microcapsule is utilized, uniformly stirring, and then coating the surface of an electrolyte membrane body with the uniformly stirred solution to obtain the microcapsule modified electrolyte membrane. And assembling and applying the obtained microcapsule modified electrolyte membrane to a lithium battery. According to the repairing method, the microcapsule can controllably release the repairing agent in the battery through controllable heating at a certain temperature, so that the cycle performance of the battery is effectively improved.

Description

technical field [0001] The invention relates to lithium battery technology, in particular to a lithium metal battery capable of in-situ repairing, a preparation method and a repairing method. Background technique [0002] The standby time of mobile electronics and the range of electric vehicles depend on the energy density of the batteries used. The new high specific energy metal lithium secondary battery uses lithium negative electrode instead of traditional graphite negative electrode, and its specific energy is much higher than that of the existing lithium ion battery system. However, lithium dendrites are inevitably generated during the cycle of lithium negative electrodes. Lithium dendrites are not only prone to side reactions and "dead" lithium, resulting in battery capacity attenuation, but also easy to pierce the electrolyte membrane and cause short circuits, causing battery safety problems. [0003] At present, it is improved by means of electrolyte additives, but ...

Claims

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Application Information

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IPC IPC(8): H01M10/052H01M10/0567H01M10/056H01M10/42
CPCH01M10/052H01M10/0567H01M10/056H01M10/42
Inventor许晓雄崔言明葛佳文黄园桥龚和澜戈志敏
OwnerZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD