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Electrolyte additive, electrolyte and lithium ion secondary battery

An electrolyte additive and electrolyte technology, applied in the field of lithium batteries, to achieve the effect of excellent discharge load characteristics, wide application value, and improved high temperature performance

Active Publication Date: 2021-04-06
GUANGZHOU TINCI MATERIALS TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrolyte additive can form a thin and uniform passivation protective film on the surface of the electrode active material, which can effectively solve the stability and impedance of the interface film of the electrolyte in a high temperature environment, and improve cycle performance and safety performance

Method used

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  • Electrolyte additive, electrolyte and lithium ion secondary battery
  • Electrolyte additive, electrolyte and lithium ion secondary battery
  • Electrolyte additive, electrolyte and lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] This embodiment provides a lithium secondary battery, the preparation process of which is as follows:

[0056] (1) Preparation of positive electrode sheet of lithium secondary battery

[0057] The positive electrode active material lithium nickel cobalt manganese oxide (LiNi 0.6 co 0.2 mn 0.2 o 2 ), the conductive agent Super-P, and the binder PVDF are dissolved in the solvent N-methylpyrrolidone at a mass ratio of 96:2.0:2.0 and mixed evenly to make a positive electrode slurry, and then the positive electrode slurry is evenly coated on the current collector aluminum foil , coating amount is 0.018g / cm 2 , followed by drying at 85°C, cold pressing, trimming, cutting, and stripping, and then drying at 85°C for 4 hours under vacuum conditions, welding the tabs, and making a positive electrode sheet of a lithium secondary battery that meets the requirements.

[0058] (2) Preparation of the negative electrode sheet of the lithium secondary battery

[0059] Negative ele...

Embodiment 2～4

[0070] This example provides three kinds of lithium secondary batteries, the preparation process of which is the same as that of Example 1, the main difference being that the compound (1-1) accounts for 0.1%, 0.3%, and 1% of the total mass of the lithium secondary battery electrolyte.

Embodiment 5

[0072] This embodiment provides a lithium secondary battery, the preparation process of which is the same as in Embodiment 1, the main difference being that the non-aqueous solvent is replaced by cyclic fluoroethylene carbonate (FEC), ethylene carbonate (EC) and dimethyl carbonate (DMC) A mixed solvent mixed in a mass ratio of FEC:EC:DMC=1:2:2.

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Abstract

The invention relates to an electrolyte additive, an electrolyte and a lithium ion secondary battery. The composition of the electrolyte additive comprises a compound with structural characteristics shown in the specification. The electrolyte additive can form a thin and uniform passivation protection film on the surface of an electrode active material, can improve the cycle characteristic and the storage performance of a battery used in a high-temperature environment when applied to an electrolyte, has low internal resistance and excellent discharge load characteristic at a high temperature, and can perform high-speed discharge. Meanwhile, the interface film impedance formed by participation of the additive can inhibit decomposition of LiPF6 at high temperature, alleviate high-temperature cyclic gas production caused by reaction of PF5 and a solvent, and further improve the high-temperature performance of the battery. In addition, the additive can adapt to various electrode materials and has wide application value.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to electrolyte additives, electrolytes and lithium ion secondary batteries. Background technique [0002] In response to the rapid development of large-scale energy storage, electric vehicles and portable electronic devices, it is imperative to develop new batteries with high efficiency, safety, high volume and energy density. Among all commercialized energy storage devices, lithium-ion secondary Batteries have attracted much attention because of their high energy density, high power density, long cycle life, no memory effect, and environmental protection. Lithium-ion batteries play a huge role in the normal operation of mobile phones, charging treasures, and power battery equipment. While the application range of lithium-ion batteries is expanding, people are also pursuing batteries with better overall performance. The use range of lithium-ion batteries is not only limit...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0566H01M10/0525
CPCH01M10/0567H01M10/0566H01M10/0525H01M2300/0025Y02E60/10
Inventor 洪广宁周立李闯盛寿日马美朋
Owner GUANGZHOU TINCI MATERIALS TECH