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A kind of lithium-ion battery electrolyte and battery preparation method

A lithium-ion battery and electrolyte technology, which is applied in the field of lithium-ion batteries, can solve problems such as the inability to reduce moisture, and achieve the effects of reducing moisture, improving performance, and optimizing process effects

Active Publication Date: 2018-06-01
东莞市天丰电源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it can't make the moisture in the battery drop to 10ppm or below

Method used

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  • A kind of lithium-ion battery electrolyte and battery preparation method
  • A kind of lithium-ion battery electrolyte and battery preparation method

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preparation example Construction

[0030] The present invention also provides a lithium-ion battery preparation method, which includes the following steps in sequence, active material batching, coating, pole piece preparation, pole piece baking, winding, core winding into the shell, welding, and pre-vacuum baking. The vacuum drying temperature before the above is 80±5℃, the vacuum degree is -0.095~0.10Mpa, the atmosphere inside the vacuum oven is replaced with nitrogen every 1-2H, and the baking time is 2~48h; inject the solvent of the additive, and turn the liquid injection port upside down. Stand still for 1-5 minutes, set the vacuum degree -0.05~-0.1Mpa to extract the solvent injected into the battery, and then perform post-vacuum baking. The drying temperature of the post-vacuum baking described above is 80±5°C, and the vacuum degree is -0.095 ~0.10Mpa, replace the atmosphere inside the vacuum oven with nitrogen every 1-2H, the baking time is 2~48h, the sum of the pre-vacuum baking time and the post-vacuum b...

Embodiment 1

[0034]A method for preparing a lithium-ion battery, comprising the steps of batching active materials, coating, making pole pieces, baking pole pieces, winding, winding cores into shells, welding, pre-vacuum baking, and pre-vacuum drying The temperature is 80°C, the vacuum degree is -0.095~0.10Mpa, the atmosphere inside the vacuum oven is replaced with nitrogen every 1-2H, and the baking time is 3h; the solvent dimethyl carbonate (DEC) is injected into the additive, the liquid injection port is inverted, and the To 1-5min, set the vacuum degree -0.05 ~ -0.1Mpa, so that the solvent dimethyl carbonate (DEC) injected into the battery is drawn out, and then the post-vacuum baking is carried out. The drying temperature of the post-vacuum baking is 80°C, vacuum The temperature is -0.095~0.10Mpa, the atmosphere in the vacuum oven is replaced with nitrogen every 1-2H, the baking time is 24h, the sum of the pre-vacuum baking time and the post-vacuum baking time is 27h, and then electrol...

Embodiment 2

[0036] The difference from Example 1 is: the solvent for injecting the additive is ethyl methyl carbonate (EMC) solution to clean the lithium-ion battery, and the injected electrolyte includes solvent, lithium salt and additive; the solvent is dimethyl carbonate 50wt%, carbonic acid Diethyl ester 20wt% and ethyl methyl carbonate 25wt%. The lithium salt is LiPF 6 , and its concentration is 1.0mol / L; the additives include chromium complex coupling agent 1wt%, titanate coupling agent 1wt%, vinylene carbonate 1wt%, 1,3-propane sultone 2wt% %. Others are the same as those in Embodiment 1 and will not be repeated here.

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Abstract

The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a lithium-ion battery electrolyte and a battery preparation method thereof. Between pre-vacuum baking and injection of the electrolyte, the solvent of the additive is injected, and the vacuum is set for 1-5min. Temperature -0.05~-0.1Mpa, so that the solvent injected into the battery is extracted, used as a cleaning solvent and as a functional additive, to achieve an optimized process effect, and at the same time do not introduce impurities, and then carry out post-vacuum baking, the additive solution is under high temperature conditions , Moisture is brought out during the drying and evaporation process, followed by the electrolyte injection operation. The additives left in the battery react with active groups such as water and hydroxyl groups in the battery to participate in the formation of the SEI film; at the same time, they can combine positive and negative electrode materials, separators, and pole pieces; they can support and maintain the microscopic positive and negative electrode particles inside the entire battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery electrolyte and a battery preparation method. Background technique [0002] With the popularity of electronic products in people's daily life, lithium-ion batteries have been widely used in civilian power supplies due to their environmental protection, high energy density, light weight, and safety. At the same time, users have higher and higher requirements for battery energy density, usage time and ambient temperature. [0003] At present, the electrolyte solution for non-aqueous secondary lithium batteries usually adopts an organic solvent containing cyclic carbonate and a linear carbonate. Cyclic carbonate includes ethylene carbonate (EC), propylene carbonate (PC), linear carbonate The ester includes ethyl methyl carbonate (EMC), diethyl carbonate (DEC) or a solvent system composed of any of them, with lithium hexafluorophosphat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/058
CPCH01M10/0525H01M10/0567H01M10/058Y02E60/10Y02P70/50
Inventor 邱先虎万梅薛利黄永松杨勇
Owner 东莞市天丰电源材料有限公司
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