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High-temperature electrolyte for lithium battery

An electrolyte, lithium-ion battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as insufficient performance and attenuation, achieve good high-temperature cycle performance, and improve cycle performance.

Inactive Publication Date: 2015-09-30
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, the performance of lithium-ion batteries can not fully meet the requirements of power lithium-ion batteries, especially its high-temperature cycle stability, and the battery capacity decays rapidly at higher ambient temperatures (>50°C), especially with sharp Spar LiMn 2 o 4 Lithium-ion batteries as cathode materials

Method used

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  • High-temperature electrolyte for lithium battery
  • High-temperature electrolyte for lithium battery
  • High-temperature electrolyte for lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The positive active material is LiMn 2 o 4 , the LiMn 2 o 4 , binder PVDF, and conductive agent super P in a mass ratio of 8:1:1, mixed with organic solvent NMP to form a paste, evenly coated on 20 μm aluminum foil, dried in vacuum at 120°C for 12 hours, rolled, sliced, weighed amount, and then vacuum-dried at 80°C for 15 hours to make a positive electrode sheet. The positive electrode sheet, the negative electrode Li sheet, the separator Celard2325, and the electrolyte 1mol / L LiPF 6 ,EC:DMC:EMC=1:1:1 (wt%), 0.5wt% SPDN in the vacuum glove box (H 2 O, O 2 Less than 10ppm) assembled into a 2025-type button battery.

Embodiment 2

[0027] Except for adjusting the amount of SPDN to 1 wt%, other compositions and proportions of the electrolyte and the preparation method and steps of the battery are the same as in Example 1.

Embodiment 3

[0029] Except that the amount of SPDN was adjusted to 2wt%, other compositions and proportions of the electrolyte and the preparation method and steps of the battery were the same as in Example 1.

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Abstract

The invention provides high-temperature electrolyte for a lithium battery. The high-temperature electrolyte for the lithium battery comprises a nonaqueous organic solvent, a lithium salt and an electrolyte additive. The electrolyte additive is sulfuryl dipropanenitrile and is characterized by comprising two end cyano groups and one sulfonyl group, wherein the use amount of the electrolyte additive is 0.3wt%-5wt% of the total weight of the electrolyte. By use of the high-temperature electrolyte, the cycle performance of the lithium battery under a high temperature (55 DEG C) can be effectively improved.

Description

technical field [0001] The invention relates to a high-temperature lithium battery electrolyte, which can effectively improve the cycle performance of the lithium battery under high-temperature conditions. Background technique [0002] Lithium-ion secondary batteries have become the most popular secondary batteries due to their outstanding advantages such as high energy density, no memory effect, and no pollution. After years of development, lithium-ion batteries have been widely used in portable electronic devices such as mobile phones, notebook computers, and digital cameras. But so far, the performance of lithium-ion batteries can not fully meet the requirements of power lithium-ion batteries, especially its high-temperature cycle stability, and the battery capacity decays rapidly at higher ambient temperatures (>50°C), especially with sharp Spar LiMn 2 o 4 Lithium-ion batteries as cathode materials. Electrolyte, as one of the key materials of lithium-ion batteries...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567
CPCY02E60/10
Inventor 吴茂祥黄韬王文国潘荧方桂煌
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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