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A kind of electrolyte additive and its use in lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as fast capacity decay, system instability, and increased battery impedance, and achieve the effects of reduced losses, suppressed by-products, and high oxidation stability

Active Publication Date: 2022-05-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned existing problems or deficiencies, in order to solve the problems of existing lithium-ion battery transition metal dissolution and electrolyte system instability, which in turn lead to increased battery impedance and rapid capacity decay, the present invention provides an electrolyte additive and its use in lithium ion batteries. Use in ion batteries

Method used

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  • A kind of electrolyte additive and its use in lithium ion battery
  • A kind of electrolyte additive and its use in lithium ion battery
  • A kind of electrolyte additive and its use in lithium ion battery

Examples

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Embodiment 1

[0038] This example mainly illustrates the preparation of batteries and the preparation of electrolytes containing additives.

[0039] 1. Electrode Preparation

[0040] The mass ratio of the solid matter on the electrode is respectively active material: acetylene black: polyvinylidene fluoride (PVDF) = 8:1:1. The preparation process is as follows: first dissolve PVDF in 20-30 times the mass of N-methylpyrrolidone (NMP) to form a transparent solution, then mix and grind the active material and acetylene black, add it to the transparent solution, and stir for 8-24 hours to obtain a slurry material. The slurry was uniformly coated on the aluminum foil with a 100 μm doctor blade, heated in an oven at 80°C for 1 hour to dry, and rolled to a suitable compaction density using a pair of rollers. Heated at 100°C for 10 hours under vacuum and dried, punched into pole pieces with a diameter of 14mm, weighed, and finally heated at 120°C for 10 hours under vacuum and dried again, and dir...

Embodiment 2

[0048] Electrolyte and lithium-ion battery are prepared according to the same method as in Example 1, except that an electrolyte additive with a mass percentage content of 0.5% is added to the electrolyte, and the obtained electrolyte is numbered as T 2 .

Embodiment 3

[0050] Electrolyte and lithium ion battery are prepared according to the same method as in Example 1, except that an electrolyte additive with a mass percentage content of 0.1% is added to the electrolyte, and the obtained electrolyte is numbered as T 3 .

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Abstract

The invention belongs to the technical field of lithium ion batteries, and in particular relates to an electrolyte additive and its use in lithium ion batteries. The invention discloses an electrolyte additive, and provides an electrolyte containing the additive and a lithium ion battery using the electrolyte. The electrolyte additive is a biphenyl derivative, and the molecular skeleton structure is a biphenyl group, wherein one benzene ring is substituted by a perfluorine atom, and the other benzene ring contains a methoxyl group. The electrolyte additive of the present invention helps to form a uniform and stable protective layer on the surface of the positive electrode sheet, improves the phase stability between the electrode and the electrolyte, thereby improving the capacity retention performance and rate of the lithium-ion battery during the charge-discharge cycle process performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an electrolyte additive and its use in lithium ion batteries. Background technique [0002] Due to its high energy, high density, and light weight design, lithium-ion batteries have attracted much attention in the fields of portable electronic equipment, aerospace, electric and hybrid vehicles, and people have also raised concerns about their electrochemical cycle performance and safety performance. higher requirement. Traditional electrolyte systems, such as electrolyte lithium salt (LiPF 6 ) dissolved in organic solvents such as ethylene carbonate (EC), dimethyl carbonate (DMC) and ethyl carbonate (EMC) in a mixed solvent of cyclic carbonate and linear carbonate, the electrochemical performance of the electrolyte is not stable. During the charging and discharging process of the battery, the electrolyte continuously oxidizes and decomposes on the elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235H01M2300/0025Y02E60/10
Inventor 张庶谭珊
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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