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Electrolyte and lithium ion battery

A technology of electrolyte and electrolyte salt, which is applied in the field of lithium-ion batteries, can solve problems affecting battery performance, strong oxidation of electrolyte, and easy precipitation, etc., and achieve the effect of improving cycle performance, facilitating dissociation, and improving cycle performance

Active Publication Date: 2016-08-17
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current commercial lithium-ion battery electrolyte is mainly based on carbonate-based organic solvents. When the voltage is higher than 4.4V, the electrolyte will be strongly oxidized, resulting in deterioration of battery performance.
[0003] Analyzing the above problems, in order to adapt to highly oxidizable positive electrode materials, adding positive electrode passivation additives to reduce the oxidation activity of the positive electrode surface is still the main method at present. Lithium oxalate borate LiB(C 2 o 4 ) 2 (abbreviated as LiBOB) and lithium difluorooxalate borate LiBF 2 (C 2 o 4 ) (abbreviated as LiDFOB) is a relatively common type of passivation agent, however, because these compounds contain oxalic acid groups in the structure, it is easy to generate CO during the cycle 2 , In addition, these compounds have poor solubility and are easy to precipitate at low temperature, which affects the performance of the battery

Method used

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  • Electrolyte and lithium ion battery
  • Electrolyte and lithium ion battery
  • Electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
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Embodiment

[0067] The present invention will be specifically described below by way of examples, but the present invention is not limited by these examples.

reference example 1

[0068] [Reference Example 1] Synthesis of Compound

[0069] Synthesis of compound A of the general formula

[0070] first step:

[0071]

[0072] Step 2:

[0073]

[0074] Operation steps: add 100 ml of toluene into a 250 ml single-necked bottle, then quantitatively add ethylene glycol (20.000 g, 322.37 mmol) and boric acid (9.966 g, 161.19 mmol), and reflux for 2 h under stirring conditions. Then use a water separator to separate the water, collect about 8.7g of water, stop the reaction, cool, concentrate to remove the solvent toluene, and fully remove the excess solvent with an oil pump to obtain 21.4g of white solid B-1-I.

[0075] LiOH (6.76g, 161.10mmol) was added to a 250ml single-necked bottle, the white solid B-1-I (21.4g) obtained in the previous step, toluene (200ml), and water (20ml) were reacted at 80°C for 4h, and after cooling down, Toluene and water were removed in vacuo, and dried in vacuo at 70 °C for 16 h to obtain a white powder B-1. This product...

Embodiment 1

[0081] Through the M6S process, the cathode is LiCoO 2 , the negative electrode is a soft-packed battery core of graphite, dried at 85°C to a moisture content of less than 200ppm, and the prepared electrolyte is injected into the battery core. The composition of the electrolyte is shown in Table 3, and the structural formula of the boron salt additive is shown in Table 1.

[0082] table 3:

[0083]

[0084]

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Abstract

The invention relates to the field of lithium ion batteries, in particular to an electrolyte and a lithium ion battery. The electrolyte contains electrolyte salt, an organic solvent and an additive. The additive contains a boron salt additive. The additive further contains an SEI film-forming additive. The anion part of the boron salt additive can effectively disperse the negative charge density of anions, a negative charge center is shielded by a ligand with a large structure, therefore, an anode is effectively protected during circulation, and the circulation performance of the high-voltage battery is improved.

Description

technical field [0001] The present application relates to the field of lithium ion batteries, and in particular, to an electrolyte and a lithium ion battery. Background technique [0002] In recent years, with the rapid development of lithium-ion batteries in the field of portable electrical appliances, there is an increasing demand for small, lightweight, thin, and high-performance batteries that provide power for these portable electronic devices. Due to the continuous pursuit of high energy density of batteries, it is a common idea in the industry to continuously improve the working voltage of cathode materials to improve the energy density of cells. However, while providing high energy density, the high-voltage cathode material also improves its own oxidative capacity. The current commercial lithium-ion battery electrolytes are mainly based on carbonate-based organic solvents. When the voltage is higher than 4.4V, the electrolyte will be strongly oxidized, resulting in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 颜剑湛英杰付成华
Owner NINGDE AMPEREX TECH
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