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A kind of lithium ion battery and preparation method thereof

A technology of lithium-ion batteries and battery casings, applied in the field of lithium-ion batteries, can solve the problems of lithium-ion battery performance degradation and the inability to guarantee the SEI film of lithium-ion batteries, etc., to facilitate large-scale production, reduce irreversible capacity loss, and improve ion capacity. The effect of transfer rate

Active Publication Date: 2017-08-25
CHINA AVIATION LITHIUM BATTERY LUOYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, adding the above-mentioned film-forming additives in the electrolyte is greatly affected by the solubility of the film-forming additives in the electrolyte solvent. After the electrolyte solvent type changes, the amount of the film-forming additives that can be dissolved in the electrolyte is affected. There is no guarantee that there is sufficient SEI film on the surface of the negative electrode of the lithium-ion battery, especially during the charging and discharging process of the battery, with the consumption of the SEI film, the performance of the lithium-ion battery will decline again

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  • A kind of lithium ion battery and preparation method thereof
  • A kind of lithium ion battery and preparation method thereof

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Embodiment 1

[0023] The lithium-ion battery of this embodiment is a soft-packed ternary material lithium-ion battery, comprising a sealed battery case and an electric core contained in the battery case, the electric core such as figure 1 As shown in middle A, the battery casing of this embodiment is an aluminum-plastic film soft bag, and the aluminum-plastic film soft bag is filled with a mixed gas of film-forming gas and argon, and the film-forming gas is CO 2 Gas, film-forming gas CO in mixed gas 2 The volume percent concentration is 1%, and the pressure of the mixed gas in the aluminum-plastic film soft bag is 120kPa.

[0024] The preparation method of the lithium ion battery of the present embodiment comprises the steps:

[0025] 1) Put the ternary material soft-packed lithium-ion battery after one-time formation in a vacuum static box, and pump air into the aluminum-plastic film soft bag of the soft-packed lithium-ion battery. The pumping time is 5 minutes, and the pumping is complet...

Embodiment 2

[0028] The lithium-ion battery of this embodiment is a soft-packed ternary material lithium-ion battery, including a sealed battery case and an electric cell housed in the battery case. The battery case of this embodiment is an aluminum-plastic film soft case, and an aluminum-plastic film The soft bag is filled with a mixed gas of film-forming gas and argon, and the film-forming gas is SO 2 Gas, film-forming gas SO in mixed gas 2 The volume percent concentration is 0.5%, and the pressure of the mixed gas in the aluminum-plastic film soft bag is 105kPa.

[0029] The preparation method of the lithium ion battery of the present embodiment comprises the steps:

[0030] 1) Place the ternary material soft-packed lithium-ion battery after one-time formation in a vacuum static box, and pump air into the aluminum-plastic film soft bag of the soft-packed lithium-ion battery. The pumping time is 1 minute, and the pumping is completed. Afterwards, the vacuum degree in the aluminum-plast...

Embodiment 3

[0033] The lithium-ion battery of this embodiment is a soft-packed ternary material lithium-ion battery, including a sealed battery case and an electric cell housed in the battery case. The battery case of this embodiment is an aluminum-plastic film soft case, and an aluminum-plastic film The soft bag is filled with a mixed gas of film-forming gas and argon, and the film-forming gas is N 2 O gas, film-forming gas N in the mixed gas 2The volume percent concentration of O is 2%, and the pressure of the mixed gas in the aluminum-plastic film soft bag is 150kPa.

[0034] The preparation method of the lithium ion battery of the present embodiment comprises the steps:

[0035] 1) Place the ternary material soft-packed lithium-ion battery after one-time formation in a vacuum static box, and pump air into the aluminum-plastic film soft bag of the soft-packed lithium-ion battery. The pumping time is 10 minutes, and the pumping is completed Afterwards, the vacuum degree in the aluminu...

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Abstract

The invention relates to a lithium ion battery and a preparation method thereof, belonging to the technical field of lithium ion batteries. The lithium ion battery of the present invention includes a sealed battery casing, and the battery casing is filled with a film-forming gas, and the film-forming gas is CO2 or SO2 or N2O. The film-forming gas is filled inside the lithium-ion battery of the present invention, the first discharge efficiency and cycle performance of the battery are significantly improved, the first charge and discharge efficiency is above 89.70%, and the capacity retention rate after 60°C and 500 cycles is 94.7% above. The safety performance of lithium-ion batteries has also been greatly improved.

Description

technical field [0001] The invention relates to a lithium ion battery and a preparation method thereof, belonging to the technical field of lithium ion batteries. Background technique [0002] During the charging and discharging process of lithium-ion batteries, the electrode material and the electrolyte react at the solid-liquid phase interface, and the electrolyte is reduced and decomposed, and a passivation film will be formed on the surface of the negative electrode material, which is usually called the solid electrolyte interface (solid electrolyte interface). interface) film, that is, SEI film, the film thickness of SEI film is about 100-120nm, and the film layer mainly contains Li 2 CO 3 , LiF, Li 2 O, LiOH and other inorganic components and ROCO 2 Li, ROLi, (ROCO 2 Li) 2 and other organic ingredients. The charging and discharging process of lithium-ion batteries includes the insertion or extraction of lithium ions in the negative electrode material, and the ins...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M10/0567H01M10/058
CPCH01M10/0525H01M10/0567H01M10/058Y02E60/10Y02P70/50
Inventor 赵晓锋张方方
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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