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Non-aqueous electrolyte and lithium-ion battery employing same

A non-aqueous electrolyte and electrolyte technology, which is applied in the field of lithium-ion batteries, can solve the problems of electrolyte consumption, reduced battery capacity, and poor high-temperature performance, and achieve the effects of improved wettability, small impedance, uniform and dense impedance

Inactive Publication Date: 2016-08-10
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, at high temperature, the formed SEI film is not dense and stable enough, and the SEI film will gradually dissolve or rupture, causing the exposed negative electrode to continue to react with the electrolyte, which consumes the electrolyte and reduces the battery capacity.
[0004] In addition, another factor controlling the high and low temperature performance of the battery is the wetting ability of the electrolyte to the pole piece. If the content of low melting point and low viscosity solvent is increased, the low temperature performance of the battery will indeed be improved, but its high temperature performance will be deteriorated. take into account

Method used

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  • Non-aqueous electrolyte and lithium-ion battery employing same
  • Non-aqueous electrolyte and lithium-ion battery employing same
  • Non-aqueous electrolyte and lithium-ion battery employing same

Examples

Experimental program
Comparison scheme
Effect test

reference example 1

[0073] [Reference Example 1] Synthesis of Compound A

[0074]

[0075] First step response:

[0076]

[0077] Second step reaction:

[0078]

[0079] The third step reaction:

[0080]

[0081] Operation steps: add 200ml methylene chloride as a solvent in a sealed flask with stirring, then add methanesulfonyl chloride (19.4g, 169.4mmol) as a reaction substrate, 15g bromoethanol (121mmol) is dissolved in 18.3g triethylamine was slowly added to the above solution. After the addition was complete, the stirring reaction was continued for 3 hours, and the reaction ended. The reactant was washed with saturated brine, the upper organic phase was separated, and the solvent was removed by heating to obtain the initial product, which was purified by silica gel column separation (eluting solvent: cyclohexane / ethyl acetate=3 / 2) to obtain 22.6 g of a colorless oil , as the product compound IL-1-1 of the next reaction.

[0082] 13g (64.0mmol) of the above compound was dissol...

reference example 2

[0088] [Reference Example 2] Synthesis of Compound B

[0089]

[0090] First step response:

[0091]

[0092] Second step reaction:

[0093]

[0094] The third step reaction:

[0095]

[0096] Operation steps: add 200ml methylene chloride as solvent in a sealed flask with stirring, then add methanesulfonyl chloride (19.4g, 169.4mmol) as the reaction substrate, 15g (121mmol) bromoethanol is dissolved in 18.3g triethylamine was slowly added to the above solution. After the addition was complete, the stirring reaction was continued for 3 hours, and the reaction ended. The reactant was washed with saturated brine, the upper organic phase was separated, and the solvent was removed by heating to obtain the initial product, which was purified by silica gel column separation (elution solvent was cyclohexane / ethyl acetate=3 / 2) to obtain 22.6 g of a colorless oil , as the product compound IL-2-1 of the next reaction.

[0097] 22g (108.4mmol) of the above compound was di...

Embodiment 1

[0114] Through the M6S process, the positive electrode LiCoO is manufactured 2 , Negative electrode graphite soft pack cell, dried at 85°C until the water content is below 200ppm, inject the prepared electrolyte into the cell. The specific structure of the additive compound in the electrolyte is shown in Table 1, and the composition of the electrolyte is shown in Table 2.

[0115] Table 1:

[0116]

[0117] Table 2:

[0118]

[0119]

[0120] The performance of the lithium-ion battery electrolyte additive of the present application and the lithium-ion battery using the additive is described below through experimental data.

[0121] Test 1: capacity retention rate test, the purpose is to test the improvement of the low-temperature cycle performance of the electrolyte.

[0122] After the completion of the preparation, the 0.5C charge-discharge current of each example and the comparative example was repeatedly charged and discharged between 3.0V and 4.35V at 25°C and ...

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Abstract

The invention relates to the field of lithium-ion batteries, in particular to a non-aqueous electrolyte and a lithium-ion battery employing the same. The non-aqueous electrolyte comprises a lithium salt, a solvent and an additive, wherein the additive comprises a sulphonate quaternary ammonium salt and an SEI film-forming additive. By the non-aqueous electrolyte, the wettability of the electrolyte on an active material pole piece is significantly improved; a solid electrolyte membrane which is small in impedance, uniform and compact is generated on the surface of the pole piece; and the dynamic performance of the pole piece is improved, so that the battery has good cycle performance when the pole piece is highly compacted or at a low temperature.

Description

technical field [0001] The present application relates to the field of lithium ion batteries, in particular, to a nonaqueous electrolytic solution and a lithium ion battery using the nonaqueous electrolytic solution. Background technique [0002] In recent years, with the rapid development of lithium-ion batteries in the field of portable appliances, there is an increasing demand for small, lightweight, thin and high-performance batteries that provide power for these portable electronic devices. Due to the continuous pursuit of high energy density of batteries, the use of positive and negative electrodes with high compaction density or negative electrode materials with poor cycle performance at high capacity is a strategy commonly adopted by the industry. The resulting problem is that the electrolyte cannot fully infiltrate the electrodes, resulting in an increase in the charging platform of the battery and a decrease in the discharge platform, which affects the output perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 湛英杰颜剑
Owner NINGDE AMPEREX TECH
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