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Nanostructure lithium battery electrolyte additive, its preparation method and electrolyte

An electrolyte additive and nanostructure technology, which can be used in the manufacture of electrolyte batteries, nanotechnology, secondary batteries, etc., can solve problems such as the inability to meet the needs of the full life cycle of batteries

Active Publication Date: 2020-02-07
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, additives based on the principle of "self-sacrifice" will gradually be exhausted with the cycle of the battery and cannot meet the needs of the entire life cycle of the battery. Therefore, an additive that is different from the "self-sacrifice" mechanism is urgently needed to increase the lithium ion migration number. Improve battery safety performance

Method used

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  • Nanostructure lithium battery electrolyte additive, its preparation method and electrolyte
  • Nanostructure lithium battery electrolyte additive, its preparation method and electrolyte
  • Nanostructure lithium battery electrolyte additive, its preparation method and electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Preparation of additives

[0027] The preparation method of the additive of the present embodiment comprises the steps:

[0028] (1) 0.6g (about 1mM) nanostructured SiO 2 (about 7nm in diameter) was added to 10mL of water, and ultrasonically dispersed for 30min to make SiO 2 Disperse uniformly in water, then add 1.23g of 1-bromopropane to disperse uniformly, then slowly add saturated LiOH solution until the pH value is 14, and then continue ultrasonic dispersion for 20min to obtain a mixture;

[0029] (2) Transfer the mixture prepared in step (1) to the liner of a polytetrafluoroethylene-made hydrothermal kettle, then cover it, put it into the hydrothermal kettle, conduct a hydrothermal reaction at 150°C for 6 hours, centrifuge or filter to obtain a solid substance, Wash with ultrapure water until the washing water is neutral, and dry in vacuum at 75°C for 24 hours to obtain the obtained product.

[0030] The additive in this embodiment is a white solid powder, wh...

Embodiment 2

[0035] The preparation method of the additive is basically the same as in Example 1, but the reaction temperature is lowered to 120°C, and the reaction time is 8 hours. In addition, the electrolyte uses EC instead of PC, that is, the composition of the electrolyte is 1M LiPF 6 / EC+EMC+DMC(4:3:3, wt), also used for ternary materials||lithium titanate soft pack battery, the amount of electrolyte remains unchanged. Test its cycle performance at 60°C.

Embodiment 3

[0037] 1. Preparation of additives

[0038] (1) 0.6g (about 1mM) nanostructured SiO 2 (about 7nm in diameter) was added to 10mL of water, and ultrasonically dispersed for 30min to make SiO 2 Disperse uniformly in water, then add 3g of 1-chlorotetraethylene glycol dimethyl ether to disperse uniformly, then slowly add saturated LiOH solution until the pH value is 13, and then continue ultrasonic dispersion for 30min to obtain a mixture;

[0039] (2) Transfer the mixture prepared in step (1) to the liner of the polytetrafluoroethylene material hydrothermal kettle, then cover it, put it into the hydrothermal kettle, react with water at 180°C for 8h, centrifuge or filter to obtain solid matter, and use Wash with ultrapure water until the washing water is neutral, and dry in vacuum at 75°C for 24 hours to obtain the final product.

[0040] 2. Electrolyte preparation

[0041] Use molecular sieves to remove water from PC, FEC, and DMC, and filter to obtain a dry solvent with a wate...

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Abstract

The invention discloses a nanostructure lithium battery electrolyte additive, its preparation method and electrolyte. The nanostructured lithium battery electrolyte additive is a nanostructured lithium salt, including an inorganic rigid core and an organic flexible fluffy side chain, which can be stably and uniformly dispersed in the electrolyte. The nano-structured lithium battery electrolyte additive of the present invention can effectively increase the lithium ion migration number of the electrolyte, improve the high and low temperature performance and safety of the electrolyte, and especially inhibit the loss of lithium ion batteries and metal lithium batteries during fast charging at low temperatures. Dendrites have a dramatic effect.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery electrolyte, and in particular relates to a nanostructure lithium battery electrolyte additive, a preparation method thereof and an electrolyte. Background technique [0002] In recent years, due to its high energy density, no memory effect, high energy conversion efficiency, safety and environmental protection, the application of lithium-ion batteries in the fields of consumer electronics, electric vehicles, and large-scale energy storage has shown explosive growth. The ion itself is highly active, and the liquid organic electrolyte is used, so the battery has potential safety hazards, especially in the occasions such as fast charging and low temperature, because the migration speed of lithium ions is slow, or it is too late to be embedded in the negative electrode, it will deposit on the surface of the negative electrode, forming dendrites, and gradually Cause a short circuit and cau...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/058B82Y40/00
CPCB82Y40/00H01M10/0567H01M10/058H01M2300/0025Y02E60/10Y02P70/50
Inventor 张兰石朝辉张晓妍张海涛张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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