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Lithium ion battery, electrolyte and additive thereof

An electrolyte additive and lithium-ion battery technology, which is applied in secondary batteries, circuits, electrical components, etc., can solve the problems of reducing the rate of charge and discharge of lithium-ion batteries, cycle performance, and hidden safety problems, so as to improve the charging window and cycle. performance, slowing propagation, and improving the effect of rate charge and discharge performance

Pending Publication Date: 2022-04-12
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the cycle process, the growth of lithium dendrites causes lithium precipitation, which makes its safety a huge hidden danger, and also reduces the rate charge and discharge and cycle performance of lithium-ion batteries.

Method used

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  • Lithium ion battery, electrolyte and additive thereof
  • Lithium ion battery, electrolyte and additive thereof
  • Lithium ion battery, electrolyte and additive thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of an electrolyte: In a glove filled with argon, the vinyl carbonate, carbonate, and diethyl ethyl carbonate is mixed by mass Ec: Pc: DEC = 1: 1: 3, and then slow to the mixed solution. The addition of lithium hexafluorophosphate based on the total weight of the electrolyte and 0.5 wt% diofluorite is added, and finally the lithium fluoride based on the total weight of the electrolyte, 0.5% by weight of fluoride, 6.0% by weight of fluoride. The vinyl carbonate and 1.0% by weight of the vinyl sulfate, the mixture is mixed, and the lithium ion battery electrolyte is obtained.

[0027] Preparation of a lithium ion battery: The resulting positive electrode plate, the diaphragm, and negative electrode sheets are stacked in order, so that the diaphragm is between the positive electrode plate and the negative electrode plate, wound to obtain a bare core; In an aluminum-plastic film outer package, the above-mentioned electrolyte is injected into a dry battery, sealed, st...

Embodiment 2

[0029] The preparation of the electrolytic solution of the present embodiment is the same as that of the lithium ion battery, and the present embodiment is added to the electrolytic solution of 0.5% by weight of lithium fluoride and 0.3% by weight when the electrolyte is disposed. Fluorine.

[0030] The rest is the same as in Example 1, and details will not be described herein.

Embodiment 3

[0032] The preparation of the electrolytic solution of the present embodiment is the same as that of the lithium ion battery, and the present embodiment is in that the present embodiment is added to the electrolyte total weight of 0.5% by weight of fluorinated lithium fluoride and 0.1% by weight. Fluorine.

[0033] The rest is the same as in Example 1, and details will not be described herein.

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Abstract

The invention discloses a lithium ion battery, an electrolyte and an additive thereof, the additive comprises at least two metal fluorides, and the metal in the metal fluorides comprises any one of lithium, sodium, potassium, rubidium, cesium and francium. According to the invention, the metal fluoride is added into the electrolyte, and in the charging process of the lithium battery using the electrolyte, the proportion of the metal fluoride component in an SEI film is increased, so that the stability of the SEI film is enhanced, inhibition of lithium dendrites is realized, the rate charge-discharge performance is improved, and in the lithium deposition process, metal ions are absorbed on the surface of lithium, so that the surface of the SEI film is prevented from being damaged. The lithium ion battery has the advantages that the lithium ion battery is not reduced, the lithium deposition which is not reduced and irregular occurs, more metal ions can be attracted to the tip part by the accumulation of charges, so that electrostatic shielding is formed, the non-uniform deposition of the lithium ions is prevented, the propagation of lithium dendrites can be slowed down, and the growth of the lithium dendrites is inhibited to a certain extent.

Description

Technical field [0001] The present invention relates to the technical field of lithium ion batteries, and more particularly to a lithium ion battery, an electrolyte and its additive thereof. Background technique [0002] Lithium-ion batteries are widely used in electronic digital, electric vehicles, energy storage applications and aerospace sectors due to their high operating voltages, long cycle life, high energy density, environmental green friendship, wide application. As the "blood" of the lithium-ion battery, the electrolyte is one of the important composition of the lithium ion battery. It is responsible for transmitting power between the positive and negative poles, and the performance of lithium battery is critical, solvent, lithium salt, additive pair Lithium-ion batteries have an important role in low temperature, cycle, storage and safety performance. During the cycle, due to the lithium lithium phenomenon, the safety problem has become a huge hazard, and the magnifica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
Inventor 杨新哲李江蓝熊伟马斌陈杰
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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