A kind of 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 incomplete dissolution, low solubility, and poor electrochemical performance of batteries, and achieve the goal of inhibiting corrosion hazards, improving electrochemical performance, and improving electrochemical performance Effect

Active Publication Date: 2022-03-25
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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  • A kind of high nickel ternary lithium ion battery electrolyte and lithium ion battery
  • A kind of high nickel ternary lithium ion battery electrolyte and lithium ion battery
  • A kind of high nickel ternary lithium ion battery electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of electrolyte: In a glove box filled with argon, ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) were prepared by mass ratio as EC: PC:DEC:EMC=25:5:10:60 for mixing to obtain a mixed solution, and then slowly adding 12.5wt% lithium hexafluorophosphate (LiPF based on the total mass of the electrolyte) to the mixed solution 6 ), 1.0 wt % lithium difluorophosphate (LiPO) based on the total mass of the electrolyte 2 F 2 ) and 2.5 wt % lithium bisfluorosulfonimide (LiFSI) based on the total mass of the electrolyte, finally adding a pyridinium sulfonate additive compound (2) accounting for 0.3 wt % of the total electrolyte mass, and stirring to obtain an embodiment 1 lithium-ion battery electrolyte.

Embodiment 2-6

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

[0036]In Example 2-6 and Comparative Example 1-6, except that the composition ratio of each component 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 electrolyte composition ratio of each component 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 the sulfonic acid pyridinium salt additive is the mass percentage content in the electrolyte;

[0043] The content of each component in the conventional additive is the mass percentage content 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 an electrolyte solution for a high-nickel ternary lithium ion battery, which comprises a non-aqueous organic solvent, an electrolyte lithium salt and additives. The additives include at least one sulfonic acid pyridinium salt additive with a specific structure. The invention also discloses a lithium ion battery comprising a positive electrode sheet, a separator, a negative electrode sheet and the high-nickel ternary lithium ion battery electrolyte. The reduction potential of the sulfonic acid pyridinium salt additive of the present invention is 1.6V vs Li + / Li or so, prior to solvents and conventional additives to reduce film formation, play a role in stabilizing the negative electrode passivation film, and at the same time have the effect of positive electrode film formation, the oxidation decomposition potential is 4.35V vs Li + / Li, which can promote the protection of positive electrode materials, and can effectively improve the cycle performance, high-temperature storage performance and low-temperature performance of ternary lithium-ion batteries.

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 field of 3C digital, in recent years, mobile electronic devices, especially smart phones, have developed rapidly in the direction of lighter and thinner, which puts forward higher requirements for the energy density of lithium-ion batteries. [0003] In order to improve the energy density of lithium-ion batteries, a common measure is to increase the charge cut-off voltage of the cathode material, such as the voltage of commercial ternary material lithium-ion batteries from 4.2V→4.35V→4.4V→...

Claims

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Application Information

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Patent Type & Authority Patents(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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