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Crown ether electrolyte and application thereof

A technology of electrolyte and crown ether, which is applied in the field of materials, can solve the problems of rapid cycle performance attenuation, and achieve the effects of improving Li+ solubility, improving negative electrode efficiency, and improving cycle performance

Inactive Publication Date: 2020-06-16
ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS
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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 rates decays rapidly.

Method used

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  • Crown ether electrolyte and application thereof
  • Crown ether electrolyte and application thereof
  • Crown ether 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, in the electrolyte, add 1% of the total amount of electrolyte ethylene carbonate, 3% of the total amount of electrolyte 1,3-propane sultone and 0.02% of the total amount of electrolyte shown in formula (2) crown ether derivatives.

[0025] Use the lithium iron phosphate lithium ion battery containing the electrolyte as the positive electrode and graphite as the negative electrode, and charge and discharge the battery at 0.1C to form the battery, and measure its first charge and discharge efficiency. , 10C current charging to 3.65V, charging at 3.65V constant voltage, cut-off current 0.2C, and correspondingly use the corresponding current constant current to conduct cycle charge and discharge tests at different rates. The test results are shown in Table 1.

[0026]

Embodiment 2

[0028] in an argon-filled glove box (H 2 O6 ) in which, in the electrolyte, add ethylene carbonate of 1% of the total amount of electrolyte, 3% of the total amount of electrolyte 1,3-propane sultone and 0.2% of the total amount of electrolyte shown in formula (2) crown ether derivatives.

[0029] Use the prepared lithium-ion battery containing the electrolyte, charge and discharge the battery at 0.1C to form the battery, measure its first charge and discharge efficiency, and use constant currents of 1C, 2C, 5C, and 10C to charge to 3.65V at room temperature, respectively. It is charged at a constant voltage of 3.65V, and the cut-off current is 0.2C, and the corresponding constant current is used to perform cycle charge and discharge tests at different rates. The test results are shown in Table 1.

Embodiment 3

[0031] in an argon-filled glove box (H 2 O6 ) in which, in the electrolyte, add ethylene carbonate of 1% of the total amount of electrolyte, 3% of the total amount of electrolyte 1,3-propane sultone and 0.2% of the total amount of electrolyte shown in formula (3) crown ether derivatives.

[0032] Use the prepared lithium-ion battery containing the electrolyte, charge and discharge the battery at 0.1C to form the battery, measure its first charge and discharge efficiency, and use constant currents of 1C, 2C, 5C, and 10C to charge to 3.65V at room temperature, respectively. It is charged at a constant voltage of 3.65V, and the cut-off current is 0.2C, and the corresponding constant current is used to perform cycle charge and discharge tests at different rates. The test results are shown in Table 1.

[0033]

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Abstract

The invention relates to a crown ether electrolyte. An additive comprises a crown ether derivative with a structural formula descried in the descriptions of the invention. According to the structuralformula, R1, R2, R3, R4, R5, R6, R7 and R8 are independently selected from one of hydrogen, alkyl, alkoxy, phenyl, phenoxy, halogenated alkyl, halogenated alkoxy, sulfydryl alkoxy, halogenated phenyl,halogenated phenoxy and one of group bases consisting of H, C, N, O, F, S, Si and P; or R2 and R3, or R4 and R5, or R6 and R7, or R1 and R8 are connected to form a cycloalkyl group, a halogenated cycloalkyl group, an aryl group or a halogenated aryl group. According to the crown ether electrolyte of the invention, t he crown ether derivative is added and can be coordinated with Li <+> in a solution, so that the electron mobility of Li <+> is improved, the conductivity and the solubility of Li <+> in the solution are improved; the negative electrode efficiency of a battery is improved; the battery has relatively good ion conductivity; and the cycle performance of the battery at a high rate is improved.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a crown ether electrolyte and an application thereof. Background technique [0002] As a clean and convenient energy source, lithium-ion batteries play a very important role in people's daily life. More and more electrical equipment needs to use lithium-ion batteries to supply energy for them. However, different devices work in different ways. The supply current required under environmental conditions is usually different, which leads to higher and higher requirements on the discharge current of lithium-ion batteries. The high-rate discharge performance of general lithium-ion batteries is limited by the material itself, and it cannot maintain good cycle stability under high-rate conditions for a long time. + The ions cannot move to the negative electrode quickly, resulting in a large polarization of the positive and negative electrodes, which limits the cycle perfo...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025H01M2300/0037Y02E60/10
Inventor 顾名遥
Owner ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS