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Silicon-anode lithium battery electrolyte and silicon-anode lithium battery

An electrolyte and lithium battery technology, applied in the field of electrochemistry, can solve the problems of large battery expansion and poor battery cycle performance, and achieve the effects of reducing battery flatulence, good electrochemical improvement effect, and improving charge and discharge performance

Inactive Publication Date: 2014-12-24
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

[0006] However, although this type of compound improves the cycle performance of the silicon negative electrode battery at room temperature, the cycle performance of the battery is not good at high temperatures, and the gas generation is very significant, and the battery expands greatly.

Method used

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  • Silicon-anode lithium battery electrolyte and silicon-anode lithium battery
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  • Silicon-anode lithium battery electrolyte and silicon-anode lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In an argon glove box with a water content of less than 10ppm, prepare lithium-ion battery electrolyte: lithium salt LiPF 6 Soluble in a mixed solvent of EC / DMC / EMC (mass ratio 1:1:1), in which LiPF 6 The final concentration is 1mol / L; then add 2% vinyl sulfite and FEC accounting for 10% of the total mass of the electrolyte to the electrolyte, and then use the electrolyte to prepare a silicon negative lithium ion battery. The specific test method of the battery: the silicon negative electrode lithium battery is charged to a voltage of 4.2V at a constant current / constant voltage and discharged to a voltage of 2.5V at a constant current, and the charge and discharge cycle is repeated 100 times. The discharge capacity of the lithium battery cell was measured at each cycle and the thickness before and after the cycle was measured. The tests were performed at 25°C and 60°C, respectively. The capacity retention (%) was obtained as a percentage calculated by dividing the dis...

Embodiment 2

[0030] In an argon glove box with a water content of less than 10ppm, prepare lithium-ion battery electrolyte: lithium salt LiPF 6 Soluble in a mixed solvent of EC / DMC / EMC (mass ratio 1:1:1), in which LiPF 6 The final concentration is 1mol / L; then add 5% vinyl sulfite and FEC accounting for 10% of the total mass of the electrolyte to the above electrolytic solution, and then use the electrolytic solution to prepare a silicon negative electrode lithium-ion battery. The test method is the same as in Example 1, and the test results are shown in Table 1.

Embodiment 3

[0032] In an argon glove box with a water content of less than 10ppm, prepare lithium-ion battery electrolyte: lithium salt LiPF 6 Soluble in a mixed solvent of EC / DMC / EMC (mass ratio 1:1:1), in which LiPF 6 The final concentration is 1mol / L; then add vinyl sulfite and FEC accounting for 10% of the total mass of the electrolyte to the above electrolyte, and then use the electrolyte to prepare a silicon negative lithium-ion battery. The test method is the same as in Example 1, and the test results are shown in Table 1.

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Abstract

The invention relates to silicon-anode lithium battery electrolyte. The silicon-anode lithium battery electrolyte consists of an organic solvent, a lithium salt and additives, wherein the concentration of the lithium salt is 0.001-2 mol / L; the additives consist of an additive A and fluorinated ethylene carbonate; the mass of the additive A accounts for 0.1-20% of the mass of the electrolyte; the mass of the fluorinated ethylene carbonate accounts for 0.1-10% of the mass of the electrolyte; the additive A is a sulfite compound. In a silicon-anode lithium ion battery, in non-aqueous electrolyte, the sulfite compound and the FEC (fluorinated ethylene carbonate) are used, and in EC (ethylene carbonate)-based electrolyte, electrochemical improvement effect on a silicon anode is good, and a formed SEI (solid electrolyte interface) film is thicker, so that the defect that the silicon anode has large volume expansion change in the cycle is made up, the charge and discharge performance of the silicon-anode lithium ion battery can be improved more effectively, side reactions can be reduced, thereby reducing battery expansion and improving the cycle life of the battery, and thus the room temperature performance and the high temperature performance of the battery are very good.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to an electrolyte solution of a silicon negative electrode lithium battery and a silicon negative electrode lithium battery. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, large specific energy, no pollution, no memory effect, and long life. They are widely used in portable electrical devices such as mobile phones, digital cameras, and notebook computers. At the same time, they are used as an alternative energy source for petroleum in electric vehicles. And hybrid vehicles will also be applied on a large scale. Silicon anode has a large lithium storage capacity and is abundant in the earth, making it an ideal anode material for lithium-ion batteries. [0003] Using a silicon negative electrode as the negative electrode of a lithium-ion battery, during the charge-discharge cycle, the reversible formation and deco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056
CPCH01M10/0567H01M2300/0025Y02E60/10
Inventor 袁杰秦虎王峰朱亚峰袁翔云甘朝伦
Owner ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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