A kind of electrolytic solution and lithium ion battery

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

Active Publication Date: 2019-11-22
NINGDE AMPEREX TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of electrolytic solution and lithium ion battery
  • A kind of electrolytic solution and lithium ion battery
  • A kind of electrolytic solution and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

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

reference example 1

[0068] [Reference Example 1] Synthesis of Compounds

[0069] Compound A described in the synthetic general formula

[0070] first step:

[0071]

[0072] Step two:

[0073]

[0074] Operation steps: Add 100ml of toluene to a 250ml single-necked bottle, then quantitatively add ethylene glycol (20.000g, 322.37mmol), boric acid (9.966g, 161.19mmol), and reflux for 2h under stirring. Then use a water separator to divide 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] Add LiOH (6.76g, 161.10mmol) to a 250ml single-necked bottle, white solid B-1-I (21.4g) obtained in the previous step, toluene (200ml), water (20ml), react at 80°C for 4h, after cooling down, Toluene and water were removed in vacuo, and vacuum-dried at 70° C. for 16 h to obtain white powder B-1. The product is the target compound A.

[0076] Struct...

Embodiment 1

[0081] Through the M6S process, the positive electrode LiCoO is manufactured 2 , Negative electrode graphite soft pack cell, dried at 85°C until the water content is below 200ppm, inject the prepared electrolyte into the cell. The electrolyte composition 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, 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 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 the battery, it is a common idea in the industry to continuously increase the working voltage of the positive electrode material to increase the energy density of the battery cell. However, while providing high energy density, the high-voltage cathode material also improves its own oxidation ability. 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, res...

Claims

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Application Information

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Patent Type & Authority Patents(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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