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Non-aqueous electrolyte and application thereof

A non-aqueous electrolyte and additive technology, which is applied in the field of materials, can solve the problems of rapid cycle performance attenuation, and achieve the effect of improving high temperature and normal temperature cycle performance

Inactive Publication Date: 2014-03-26
ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium iron phosphate also has disadvantages. More and more studies have shown that the cycle performance at high temperatures decays rapidly

Method used

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  • Non-aqueous electrolyte and application thereof
  • Non-aqueous electrolyte and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] in an argon-filled glove box (H 2 O6 ) in which, 2% by mass of vinyl vinyl sulfate was added to the electrolyte.

[0025] Inject the electrolyte into a 1.5A lithium iron phosphate soft pack battery, charge and discharge the battery at 0.1C to form the battery, measure its first charge and discharge efficiency, and then test its average charge and discharge capacity at 0.2C charge and discharge cycle for 10 weeks. The results are shown in Table 1.

Embodiment 2

[0027] in an argon-filled glove box (H 2 O6 ) in which, 5% by mass of vinyl vinyl sulfate was added to the electrolyte.

[0028] The above electrolytic solution was formed under the same conditions as in Example 1, and then its average charge-discharge capacity was tested under the same conditions as in Example 1. The results are shown in Table 1.

Embodiment 3

[0035] in an argon-filled glove box (H 2 O6 ) in which, 1% by mass of vinyl vinyl sulfate, 0.2% of triphenyl phosphite and 2% of cyclohexylbenzene were added to the electrolyte.

[0036] Inject the electrolyte solution into a 10A lithium iron phosphate aluminum shell battery, charge and discharge the battery at 0.1C to form the battery, measure its first charge and discharge efficiency, and then conduct a 1C charge and discharge cycle at room temperature and high temperature at 45°C to test its cycle at room temperature and high temperature performance, and the results are shown in Table 2.

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Abstract

The invention relates to a non-aqueous electrolyte which comprises an organic solvent, lithium salt and an additive, wherein the additive comprises an additive A, and the mass of the additive A accounts for 0.05%-5% of that of the non-aqueous electrolyte; the structural formula of the additive A is as follows: R1 represents the formula, R5 and R6 are independently selected from one of hydrogen, alkyl, alkoxy, phenyl, phenoxyl, halogen, halogen alkyl, halogen alkoxy, halogen phenyl and halogen phenoxyl, and n is an integer ranging from 1 to 10; and R2, R3 and R4 are independently selected from one of hydrogen, alkyl, alkoxy, phenyl, phenoxyl, halogen, halogen alkyl, halogen alkoxy, halogen phenyl and halogen phenoxyl, and halogen is fluorine, chlorine or bromine. The additive A is added into electrolyte, so that the high-temperature and normal-temperature cycling performance of a lithium ion battery are improved.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a non-aqueous electrolyte and its application. Background technique [0002] Lithium-ion batteries are more and more widely used in people's production and life, which makes its temperature environment a focus of attention. Relatively speaking, lithium-ion batteries are more prone to problems in high-temperature environments. For example, although LiMn with spinel structure 2 o 4 Compared to LiMnO 2 Both the theoretical capacity and the actual capacity have been greatly improved, but there is still the problem of structural instability during the charge and discharge process. During the charge and discharge process, the crystal structure changes repeatedly between the layered structure and the spinel structure. , resulting in repeated expansion and contraction of the electrode volume, resulting in poor cycle performance of the battery, and LiMnO 2 There are also...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/122H01M10/0525H01M10/0567H01M10/0569Y02E60/10
Inventor 陈晓琴甘朝伦李怀明袁翔云
Owner ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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