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High-nickel ternary lithium ion battery electrolyte and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of poor battery electrochemical performance, low solubility, and inability to dissolve completely, and achieve the advantages of improving electrochemical performance, inhibiting corrosion damage, and improving electrochemical performance. Effect

Active Publication Date: 2020-10-27
SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the solubility of the propanesulfonate pyridinium salt additive in the electrolyte is very low, and when the amount added exceeds 1% of the total mass of the electrolyte, this type of substance cannot be completely dissolved
When the addition amount reaches 10% of the total mass of the electrolyte, the electrochemical performance of the battery is very poor compared with the control group

Method used

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  • High-nickel ternary lithium ion battery electrolyte and lithium ion battery
  • High-nickel ternary lithium ion battery electrolyte and lithium ion battery
  • High-nickel ternary lithium ion battery electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Electrolyte preparation: In a glove box filled with argon, ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) were prepared as EC in mass ratio: PC:DEC:EMC=25:5:10:60 mixed to obtain a mixed solution, and then slowly added 12.5wt% lithium hexafluorophosphate (LiPF 6 ), based on 1.0wt% lithium difluorophosphate (LiPO 2 f 2 ) and lithium bisfluorosulfonimide (LiFSI) based on 2.5wt% of the total mass of the electrolyte, and finally add sulfonic acid pyridinium salt additive compound (2) accounting for 0.3wt% of the total mass of the electrolyte, and stir evenly to obtain the embodiment 1 Lithium-ion battery electrolyte.

Embodiment 2-6

[0035] Embodiment 2-6 and comparative example 1-6

[0036]In Examples 2-6 and Comparative Examples 1-6, except that the composition ratio of the components of the electrolyte solution is added as shown in Table 1, the others are the same as in Example 1.

[0037] Table 1 embodiment 1-6 and the composition ratio of each component of the electrolyte of comparative example 1-6

[0038]

[0039]

[0040]

[0041] Note: The concentration of each component in the lithium salt is the mass percentage in the electrolyte;

[0042] The content of sulfonic acid pyridinium salt additive is the mass percentage composition in electrolyte;

[0043] The content of each component in the conventional additive is the mass percentage in the electrolyte;

[0044] The ratio of each component in the non-aqueous organic solvent is the mass ratio.

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Abstract

The invention discloses a high-nickel ternary lithium ion battery electrolyte, which comprises a non-aqueous organic solvent, an electrolyte lithium salt and an additive, wherein the additive comprises at least one pyridinium sulfonate additive with a specific structure. The invention also discloses a lithium ion battery comprising a positive plate, an isolating membrane, a negative plate and thehigh-nickel ternary lithium ion battery electrolyte. The reduction potential of the pyridinium sulfonate additive is about 1.6V vs Li<+> / Li, the pyridinium sulfonate additive is reduced to form a filmprior to the solvent and a conventional additive, and a role of stabilizing a negative electrode passivation film is played. Meanwhile, a positive electrode film forming effect is achieved, the oxidative decomposition potential is 4.35V vs Li<+> / Li, protection of a positive electrode material is promoted, and the cycle performance, the high-temperature storage performance and the low-temperatureperformance of a ternary lithium ion battery can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-nickel ternary lithium-ion battery electrolyte and a lithium-ion battery. Background technique [0002] Lithium-ion batteries are widely used in 3C digital products, power tools, electric vehicles, aerospace and other fields due to their high operating voltage, high energy density, long life, wide operating temperature range, and environmental friendliness. Especially in the 3C digital field, in recent years, mobile electronic devices, especially smart phones, have been developing rapidly towards lighter and thinner, which puts forward higher requirements for the energy density of lithium-ion batteries. [0003] In order to increase the energy density of lithium-ion batteries, a common measure is to increase the charge cut-off voltage of the positive electrode material, such as the commercial ternary material lithium-ion battery voltage from 4.2V→4.35V→4.4V→4...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0563H01M10/0525
CPCH01M10/0563H01M10/0525H01M2300/002Y02E60/10
Inventor 潘立宁黄慧聪郭力朱学全王建斌
Owner SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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