High-voltage rate electrolyte with high-and-low temperature performance and lithium ion battery using electrolyte

A technology of electrolyte and lithium salt, which is applied in the field of lithium-ion battery preparation and high-voltage rate electrolyte, can solve the problems of aggravating the catalytic decomposition of electrolyte, greatly affecting the migration ability, and reducing the retention rate of capacity, so as to improve high-temperature storage Performance, wide liquid range, and the effect of reducing gas production

Pending Publication Date: 2018-02-16
EVE ENERGY CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The high and low temperature performance of lithium-ion batteries is mainly affected by the following factors: (1) In high temperature and high voltage, the dissolution of positive metal ions intensifies the catalytic decomposition of the electrolyte, and the decomposition gas products directly lead to battery thickness expansion, solid The product is deposited on the interface of positive and negative electrodes, which increases the internal resistance of the battery and reduces the retention rate of capacity; (2), LiPF in the electrolyte 6 It is easy to decompose at high temperature, producing HF and PF 5
Among them, HF will corrode the positive electrode, leading to the dissolution of metal ions, thereby destroying the structure of the positive electrode material, resulting in capacity loss; (3), under high voltage, the electrolyte is easily oxidized at the positive electrode, causing the metal ions of the positive electrode active material to be easily reduced. Dissolution into the electrolyte, thereby destroying the structure of the positive electrode material, resulti

Method used

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  • High-voltage rate electrolyte with high-and-low temperature performance and lithium ion battery using electrolyte
  • High-voltage rate electrolyte with high-and-low temperature performance and lithium ion battery using electrolyte
  • High-voltage rate electrolyte with high-and-low temperature performance and lithium ion battery using electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Electrolyte preparation steps: In a glove box filled with argon, ethylene carbonate, propylene carbonate, diethyl carbonate, and n-propyl propionate (that is, propyl propionate) are prepared according to the mass ratio of EC:PC:DEC :PP=20:20:45:15 for mixing, then slowly add lithium hexafluorophosphate to the mixed solution so that the concentration of lithium hexafluorophosphate in the electrolyte is 1.25mol / L, and finally add 1,2-bis( 2-cyanoethoxy)ethane (DENE), 0.5wt% vinyl sulfate (DTD), 0.3wt% vinylene carbonate (VC), 4wt% fluoroethylene carbonate (FEC), 3wt% propanesulfonic acid Lactone (PS), 0.5wt% lithium bisfluorosulfonyl imide (LIFSI), 0.3wt% lithium difluorophosphate (LIPO 2 f 2 ), 0.2wt% citraconic anhydride and stir evenly, obtain the lithium-ion battery electrolyte of embodiment 1.

[0040] Inject the lithium-ion battery electrolyte prepared in the above steps into the fully dried 4.35V graphite / LiCoO 2 For polymer batteries (volume energy density 600W...

Embodiment 2～12 and comparative example 1～6

[0054] Examples 2 to 12 and Comparative Examples 1 to 6, except that the solvent ratio, additive composition and content (based on the total weight of the electrolyte) are added as shown in Table 1, the others are the same as in Example 1. For the formula composition of each embodiment, see Table 1, physical property data see Table 2.

[0055] Note: The lithium source in Example 1 has two parts, one part is lithium hexafluorophosphate, and the other part is lithium difluorophosphate as an additive. The amount and concentration of lithium hexafluorophosphate in Examples 2-12 and Comparative Examples 1-6 are the same as in Example 1, while the content of lithium difluorophosphate varies according to Table 1.

[0056] The formula composition of each embodiment of table 1

[0057]

[0058]

[0059]

[0060] In the above table, the abbreviated names of each chemical substance are as follows:

[0061] EC (ethylene carbonate), PC (propylene carbonate), DEC (diethyl carbona...

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Abstract

The invention discloses a high-voltage rate electrolyte with high-and-low temperature performance and a lithium ion battery using the electrolyte. The electrolyte comprises a non-aqueous solvent, a lithium salt dissolved in the non-aqueous solvent and additives, wherein the non-aqueous solvent comprises propylene carbonate (PC) and linear carboxylic ester; and the additives comprise citraconic anhydride, lithium difluorophosphate (LiPO<2>F<2>), fluoroethylene carbonate, ethylene sulfate and 1, 2-di(2-cyanoethoxyl)ethane. By applying the synergistic effect generated by the solvent system and the additive optimization combination to the lithium ion battery, excellent cycle life, low-temperature discharge characteristic and high-temperature storage characteristic of the battery still can be maintained at high-voltage rate.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery preparation, in particular to a high-voltage rate electrolyte solution with both high and low temperature performance and a lithium-ion battery using the electrolyte solution. Background technique [0002] Lithium-ion battery is the most competitive battery of the new generation. It has the advantages of high working voltage, large specific capacity, long cycle life, no memory effect and environmental friendliness. It is widely used in digital, energy storage, power and military aerospace, etc. field. In recent years, lithium-ion batteries have achieved great success in the field of high-energy batteries, but consumers can still have batteries with comprehensive performance that meet high-low temperature, high-voltage rate, and this depends on the research on new electrolyte systems and additives and development. [0003] The high and low temperature performance of lithium-ion batter...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0569H01M2300/0025H01M2300/0037Y02E60/10
Inventor 曾庆鹏葛辉明李桂平张智建刘金成
Owner EVE ENERGY CO LTD
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