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Nano-structure lithium battery electrolyte additive, preparation method thereof and electrolyte

A technology of electrolyte additives and nanostructures, which is applied in the manufacture of electrolyte batteries, nanotechnology, secondary batteries, etc., and can solve problems that cannot meet the needs of the battery's full life cycle

Active Publication Date: 2017-12-29
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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  • Nano-structure lithium battery electrolyte additive, preparation method thereof and electrolyte
  • Nano-structure lithium battery electrolyte additive, preparation method thereof and electrolyte
  • Nano-structure lithium battery electrolyte additive, preparation method thereof and electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Preparation of additives

[0027] The preparation method of the additive of this embodiment includes the following steps:

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

[0029] (2) Transfer the mixture obtained in step (1) to the inner tank of a hydrothermal kettle made of polytetrafluoroethylene, then cover it, put it in the hydrothermal kettle, and react hydrothermally at 150°C for 6 hours, and centrifuge or filter to obtain solid matter. Wash with ultrapure water until the washing water is neutral, and dry it in vacuum at 75°C for 24h, and it is ready.

[0030] The additive of this embodiment is a white solid powder, which has a low solubility in the electrolyt...

Embodiment 2

[0035] The preparation method of the additive is basically the same as in Example 1, but the reaction temperature is reduced 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 batteries, the amount of electrolyte does not change. Test its cycle performance at 60°C.

Embodiment 3

[0037] 1. Preparation of additives

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

[0039] (2) Transfer the mixture obtained in step (1) to the inner tank of a hydrothermal kettle made of polytetrafluoroethylene, and then cover it, put it into the hydrothermal kettle, and react with 180 hydrothermal for 8 hours, centrifuge or filter to obtain the solid substance. Wash with ultrapure water until the washing water is neutral, and dry it in vacuum at 75°C for 24 hours, and it is ready.

[0040] 2. Preparation of electrolyte

[0041] Use molecular sieve to remove water from PC, FEC and DMC and filter to obtain a dry solvent with a water content of less ...

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Abstract

The invention discloses a nano-structure lithium battery electrolyte additive, a preparation method thereof and electrolyte. The nano-structure lithium battery electrolyte additive is a nano-structure lithium salt and comprises an inorganic rigid nuclear and an organic flexible villus-shaped side chain, and can be stably and uniformly dispersed in the electrolyte. The nano-structure lithium battery electrolyte additive provided by the invention can effectively increase a migration number of lithium ions of the electrolyte, can improve the high-low-temperature performance and safety of the electrolyte, and has significant effect for inhibiting dendritic crystals of a lithium ion battery and a metal lithium battery when in low-temperature fast charging.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion battery electrolyte, and specifically relates to a nano-structured 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 consumer electronics, electric vehicles, large-scale energy storage and other fields has shown explosive growth. The ions themselves are highly active and use liquid organic electrolyte. The battery has potential safety hazards, especially in fast charging, low temperature and other occasions. Because the lithium ion migration speed is slow, or it is too late to insert into the negative electrode, it will deposit on the negative electrode surface and form dendrites. Cause a short circuit and cause a safety accident. The lithium battery ...

Claims

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Application Information

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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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