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Lithium battery current collector, pole piece, lithium battery, preparation method thereof and application of lithium battery

A lithium battery and current collector technology, applied in the battery field, can solve the problems of low battery capacity, poor effect of lithium supplementation, long migration path of lithium ions, etc., and achieve the effects of high efficiency, easy control of conditions, and simple process

Active Publication Date: 2014-05-14
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] After research, it is found that the scheme uses lithium-supplemented cathode to provide lithium ions to the battery cell, but because the lithium-supplemented cathode is far away from the battery cell, the migration path of lithium ions is long, and the effect of lithium supplementation is not good.
[0017] It can be seen from the above that the lithium source in the existing pole piece is easy to dissolve during the first charge / discharge process, resulting in low battery capacity and affecting the application range of lithium batteries.

Method used

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  • Lithium battery current collector, pole piece, lithium battery, preparation method thereof and application of lithium battery
  • Lithium battery current collector, pole piece, lithium battery, preparation method thereof and application of lithium battery
  • Lithium battery current collector, pole piece, lithium battery, preparation method thereof and application of lithium battery

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preparation example Construction

[0075] Correspondingly, the embodiment of the present invention also provides a preparation method of the above-mentioned lithium battery current collector. For the process flow of the preparation method of the lithium battery current collector, please refer to figure 1 , including the following steps:

[0076] S01. Prepare a suspension containing lithium source material: disperse the above-mentioned lithium source material into a solvent containing a binder, and prepare a suspension; wherein, the mass ratio of the lithium source material to the binder is 1:(0.005~1:0.05);

[0077] S02. Coating the suspension on the porous current collector body: coating the suspension prepared in step S01 on the above porous current collector body, and then drying to obtain the lithium battery current collector.

[0078] Specifically, in the above step S01, the selection of lithium source materials and binders is as described above, and in order to save space, details are not repeated here. ...

Embodiment 1

[0120] A lithium battery current collector, the preparation method of which is:

[0121] The stabilized lithium metal powder-stabilized lithium MetalPowder (SLMP) of the FMC company of 3.8% by weight is dispersed in the NMP solution containing the PVdF polymer binder of 0.02% by weight to obtain a mixed solution, and then the copper foam is impregnated in the mixed solution, Vacuumize and immerse for 10 minutes, so that the above mixture can completely enter the foamed copper, and finally dry it under the protection of argon gas to obtain a porous current collector embedded with a lithium source, that is, the lithium battery current collector.

[0122] A lithium battery pole piece (lithium battery negative pole piece), the preparation method of which is:

[0123] 90% by weight of silicon-carbon composite material, 5% by weight of PVdF, 3% by weight of SP and 2% by weight of CNT were mixed in NMP solution to prepare negative electrode active material slurry, which was coated on...

Embodiment 2

[0129] A lithium battery current collector, the preparation method of which is:

[0130] Lithium metal is placed in an evaporation boat under a vacuum environment, and the lithium metal is heated sufficiently to evaporate the lithium metal; foamed copper is placed on the evaporation boat, and metallic lithium is evenly deposited in the foamed copper, thereby obtaining the lithium battery current collector.

[0131] A lithium battery pole piece (lithium battery negative pole piece), the preparation method of which is:

[0132] Mix 90% by weight of silicon-carbon composite material, 5% by weight of PVdF, 3% by weight of SP and 2% by weight of CNT in NMP solution to prepare negative electrode active material slurry, which is coated on the intercalated lithium On the source of foamed copper, dry at 100 ° C, and roll to obtain the negative electrode sheet of the lithium battery.

[0133] Preparation of lithium secondary battery:

[0134] Preparation of negative electrode sheet of...

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Abstract

The invention discloses a lithium battery current collector and a preparation method thereof, a lithium battery pole piece and a preparation method thereof, a lithium battery and a preparation method and application thereof. The lithium battery current collector includes a porous current collector body, which is filled or / and deposited with a lithium source material. The lithium source material is a lithium metal or / and lithium-rich material. The lithium battery pole piece and the lithium battery both contain the lithium battery current collector. The lithium battery current collector provided by the invention enables the lithium source material to be effectively fixed in the current collector body. The lithium battery pole piece containing the lithium battery current collector can make the lithium in the lithium source material ionize during electrochemical activation and completely absorbed by a positive active material in an anode layer or a negative active material in a cathode layer so as to compensate the lithium ion lost in an initial charge / discharge process, thereby reducing the irreversible capacity. Therefore, the lithium battery has high initial coulombic efficiency and capacity as well as safety performance.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a lithium battery current collector and a preparation method thereof, a lithium lithium battery pole piece and a preparation method thereof, a lithium battery and a preparation method thereof, and an application of the lithium battery. Background technique [0002] Among numerous energy storage technologies, lithium-ion batteries are considered to be the next generation of high-efficiency portable chemical power sources due to their high energy density, long cycle life, light weight, and no pollution. At present, it has been widely used in digital cameras, smart phones, notebook computers and so on. With the further improvement of the energy density of lithium-ion batteries, its application fields have expanded. [0003] With the increasing demand for high-capacity, long-life batteries for mobile electronic devices, people have put forward higher requirements for t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/13H01M4/139H01M10/0525H01M10/058
CPCH01M4/13H01M4/139H01M4/666H01M4/80H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 陈伟
Owner HUAWEI TECH CO LTD
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