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Lithium battery electrolyte with wettability improved, and lithium battery

A lithium battery and electrolyte technology, applied in the field of electrochemistry, can solve the problems of battery performance damage, long industrialization process, etc., and achieve the effect of improved wettability and good high-temperature output characteristics

Inactive Publication Date: 2017-07-04
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

[0002] Lithium-ion batteries are more and more widely used in people's production and life, which makes its safety issue become the focus of attention. There are two ways to solve the safety problem of lithium-ion batteries in terms of electrolytes. Way 1: All solid-state lithium-ion battery electrolyte Research is still in the research and development stage, immature, and the road to industrialization is still very long; Approach 2: Improve the electrolyte system of the existing lithium-ion battery, that is, use flame-retardant or even non-flammable solvents (fluorine-containing solvents) or flame-retardant It is one of the most promising ways to solve the flammability problem of lithium-ion battery electrolyte. They have less damage to battery performance and have obvious effects on inhibiting electrolyte combustion.

Method used

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  • Lithium battery electrolyte with wettability improved, and lithium battery
  • Lithium battery electrolyte with wettability improved, and lithium battery
  • Lithium battery electrolyte with wettability improved, and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] in an argon-filled glove box (H 2 O6 / VC / PS=35 / 10 / 35 / 15 / 2 / 3 mass ratio mix evenly, then add the total amount of electrolyte 0%, 0.05%, 0.1%, 0.3%, 0.5%, 1% respectively to the electrolyte And 2% of 2-[ethyl[(heptadecafluorooctyl)sulfonyl]amino]ethanol polyoxyethylene ether.

[0029] The ternary graphite battery was selected to be charged and discharged at 0.1C to form the battery, and the cycle performance of the battery at room temperature was tested. Test results such as figure 1 shown.

Embodiment 2

[0037] in an argon-filled glove box (H 2 O6 ) in which, 2-[ethyl[(heptadecafluorooctyl)sulfonyl]amino]ethanol polyoxyethylene ether of 0.5% of the total amount of the electrolyte and 1% of the total amount of the electrolyte of vinylene carbonate were added to the electrolyte ester.

[0038] The lithium cobaltate graphite battery is selected, and the battery is formed by charging and discharging at 0.1C, and the first charge and discharge efficiency is measured, and it is cycled at room temperature. The test results are shown in Table 1 and figure 2 shown.

[0039] Table 1

[0040]

Embodiment 3

[0048] in an argon-filled glove box (H 2 O6 ) in which, 2-[ethyl[(heptadecafluorooctyl)sulfonyl]amino]ethanol polyoxyethylene ether of 0.05% of the total amount of the electrolyte and 1% of the total amount of the electrolyte of vinylene carbonate were added to the electrolyte ester.

[0049] Lithium cobaltate graphite battery was selected, and the battery was formed by charging and discharging at 0.1C, and the first charge and discharge efficiency was measured, and it was cycled at room temperature and high temperature and placed at 85°C for 4H. The test results are shown in Tables 2, 3, 4 and image 3 As shown, among them, Table 2 and Table 3 are the test results of 85°C high-temperature storage for 4H, and Table 4 is the test result of room temperature 45C rate.

[0050] Table 2

[0051]

[0052] table 3

[0053]

[0054] Table 4

[0055]

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Abstract

The invention relates to a lithium battery electrolyte with wettability improved. The lithium battery electrolyte comprises a lithium salt, an organic solvent and an additive, wherein the additive comprises an additive A; the additive A is selected from one or a combination of the components as the structural formula as follows: a formula is as shown in the specification, wherein R1, R2, R3, R4 and R5 are one of hydrogen, hydroxyl group, alkyl group, alkoxyl group, alkenyl group, ketone group, phenyl group, phenoxyl group, fluoroalkyl group, fluoroalkoxy group, fluoroalkenyl group, fluoroketone group, fluorobenzene group and fluorophenoxyl group independently, wherein fluoro refers to partial substitution or complete substitution. By adding the additive A to the lithium battery electrolyte, the wettability of the electrolyte is obviously improved; and the lithium battery adopting the electrolyte has high high-temperature output characteristic, rate capability and cycling performance.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a lithium battery electrolyte and a lithium battery with improved wettability. Background technique [0002] Lithium-ion batteries are more and more widely used in people's production and life, which makes its safety issue become the focus of attention. There are two ways to solve the safety problem of lithium-ion batteries in terms of electrolytes. Way 1: All solid-state lithium-ion battery electrolyte Research is still in the research and development stage, immature, and the road to industrialization is still very long; Approach 2: Improve the electrolyte system of the existing lithium-ion battery, that is, use flame-retardant or even non-flammable solvents (fluorine-containing solvents) or flame-retardant It is one of the most promising ways to solve the flammability problem of the electrolyte of lithium-ion batteries at present. They have little damage to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/0569
CPCH01M10/0525H01M10/0567H01M10/0569Y02E60/10
Inventor 陈晓琴甘朝伦方星星秦虎王峰
Owner ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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