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Additive composition for preparing electrolyte, electrolyte containing additive composition and lithium ion secondary battery

A lithium secondary battery and electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, organic electrolytes, etc., can solve the problem of unsatisfactory high and low temperature performance and temperature range, reduced battery high and low temperature cycle life, sulfuric acid Solve problems such as low salt solubility, and achieve the effects of being beneficial to the storage and transportation process, low-temperature storage expansion, and good low-temperature circulation

Active Publication Date: 2021-04-06
JIUJIANG TINCI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the application, the high and low temperature performance and temperature range are not ideal.
[0009] It can be seen that the use of S=O group compounds has been given in the prior art to improve the battery while having good high-temperature and low-temperature electrical properties, and to obtain a wide temperature range, but due to the S=O group compounds in the electrolysis The liquid is unstable in the use environment, and it is easy to decompose to produce sulfate salt. The solubility of sulfate in the electrolyte is relatively small, and it is easy to precipitate from the electrolyte, resulting in turbidity of the electrolyte.
In the battery, sulfate deposits on the surface of the positive and negative electrodes of the battery increase the internal resistance of the battery, resulting in a decrease in the high and low temperature cycle life of the battery. Excessive sulfate deposition on the surface of the positive and negative electrodes can easily cause the separator to be pierced and cause a short circuit of the battery, which brings serious damage to the battery. big security risk

Method used

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  • Additive composition for preparing electrolyte, electrolyte containing additive composition and lithium ion secondary battery
  • Additive composition for preparing electrolyte, electrolyte containing additive composition and lithium ion secondary battery
  • Additive composition for preparing electrolyte, electrolyte containing additive composition and lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] (1) Preparation of electrolyte for lithium secondary battery

[0059] The electrolyte of the lithium secondary battery is lithium hexafluorophosphate (LiPF 6 ) is a lithium salt, with a mixture of ethylene carbonate (EC), ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) as a non-aqueous organic solvent, accounting for 61.99% of the total mass of the electrolyte, of which ethylene carbonate , ethyl methyl carbonate, diethyl carbonate mass ratio is 3:5:2. The additives are compound 1 and lithium bisfluorosulfonimide, accounting for 2% and 35% of the total mass of the electrolyte, respectively. Li 2 SO 4 The content is 0.01%.

[0060] (2) Preparation of positive electrode sheet for lithium secondary battery

[0061] 960g of positive electrode active material lithium nickel cobalt manganate (LiN 0.6 co 0.2 mn 0.2 o 2 ), 20g conductive agent Super-P, and 20g binder PVDF were dissolved in 320g solvent N-methylpyrrolidone according to the mass ratio of 96:2.0:...

Embodiment 2

[0067] Prepare lithium secondary battery according to the method for embodiment 1, difference is that the electrolyte of lithium secondary battery accounts for lithium hexafluorophosphate (LiPF6) of 1% of electrolyte gross mass as lithium salt, and non-aqueous organic solvent is ethylene carbonate (EC) , ethyl methyl carbonate (EMC), and diethyl carbonate (DEC), accounting for 64.18% of the total mass of the electrolyte, with a mass ratio of 3:5:2. The additives are compound 2 and lithium bisfluorosulfonimide, accounting for 1.8% and 33% of the total mass of the electrolyte, respectively. Li 2 SO 4 The content is 0.02%. The cathode material used in lithium secondary batteries is LiNi 0.8 co 0.1 mn 0.1 o 2 , the negative electrode material is silicon carbon.

Embodiment 3

[0069] A lithium secondary battery was prepared according to the method of Example 1, except that the non-aqueous organic solvent was ethylene carbonate (EC), ethyl methyl carbonate (EMC), diethyl carbonate (DEC), accounting for 67.27% of the total mass of the electrolyte , the mass ratio is 3:5:2. The additives are compound 3 and lithium bisfluorosulfonyl imide, accounting for 1.7% and 30% of the total mass of the electrolyte, respectively, and lithium hexafluorophosphate (LiPF6) is a lithium salt and accounting for 1% of the total mass of the electrolyte. Li 2 SO 4 The content is 0.03%. The cathode material used in lithium secondary batteries is LiNi 0.8 co 0.15 Al 0.05 o 2 , the negative electrode is graphite.

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Abstract

The invention provides an additive composition for preparing an electrolyte, the electrolyte containing the additive composition, and a lithium ion secondary battery. The additive composition for preparing the electrolyte is composed of a diisocyanate compound and a compound containing an S=O group according to a specific ratio. The content of a substance (1 / nA<n+>)2SO4<2-> (wherein A represents a cation other than H and n represents an integer greater than or equal to 1 and less than or equal to 10) in an electrolyte formed by the composition, an electrolyte solvent and a lithium salt accounts for less than or equal to 0.1% of the total mass of the electrolyte, and the lithium ion secondary battery prepared from the electrolyte also has very good high and low temperature performance and high rate cycle life.

Description

technical field [0001] The present invention is used to prepare an additive composition for electrolyte, an electrolyte containing the additive composition, and a lithium ion secondary battery using the electrolyte. Background technique [0002] Due to the characteristics of high energy density, long cycle life and no pollution, lithium secondary batteries have broad application prospects in consumer electronics, power vehicle batteries and energy storage power supplies. [0003] In recent years, with the depletion of global petroleum energy and the development of new energy technologies, the lithium secondary battery technology used in automobile power has developed rapidly. Higher requirements are placed on the performance of lithium secondary batteries. For example, batteries need to have a longer service life, need to be able to be used under extreme temperatures, need to have good high temperature resistance performance, and need to have better safety. [0004] Lithiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0568H01M10/0569H01M10/0525H01M10/4235H01M2300/0025Y02E60/10
Inventor 范伟贞信勇赵经纬
Owner JIUJIANG TINCI ADVANCED MATERIALS CO LTD
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