Electrolyte for lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of low charging and discharging efficiency of lithium-ion batteries, poor cycle performance, restricting the development of high-voltage lithium-ion batteries, etc., so as to improve cycle performance and rate performance, Not easy to decompose and improve cycle performance

Active Publication Date: 2014-02-05
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrolyte of lithium-ion batteries is easy to decompose under high voltage (above 4.5V), resulting in low charge and discharge efficiency and poor cycle performance of lithium-ion batteries, which limits the further development of high-voltage lithium-ion batteries

Method used

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  • Electrolyte for lithium ion battery
  • Electrolyte for lithium ion battery
  • Electrolyte for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The present embodiment lithium-ion battery uses electrolytic solution:

[0030] According to the mass ratio of 1:1:1, ethylene carbonate, dimethyl carbonate, and ethyl methyl carbonate were respectively weighed to form mixed solvent A, and then mixed solvent A accounting for 50% of the total mass of the electrolyte was mixed with 35% of the total mass of the electrolyte. % trifluoromethyltrimethylsilane solvent mixed to form a mixed solvent B; in the mixed solvent B, add LiPF 6 Prepare an electrolyte solution with a lithium salt concentration of 1mol / L, and then add 1,3-propane sultone to obtain it. The amount of 1,3-propane sultone accounts for 2% of the total mass of the electrolyte.

Embodiment 2

[0032] The present embodiment lithium-ion battery uses electrolytic solution:

[0033] Weigh ethylene carbonate, dimethyl carbonate and diethyl carbonate according to the mass ratio of 2:2:1 to form mixed solvent A, and then mix solvent A accounting for 64% of the total mass of the electrolyte with 25% of the total mass of the electrolyte. % of trifluoromethyltriethylsilane solvent mixed to form mixed solvent B; in mixed solvent B, add LiClO 4 Make the lithium salt concentration 0.8mol / L, and then add 1,3-propane sultone to obtain it. The amount of 1,3-propane sultone accounts for 1% of the total mass of the electrolyte.

Embodiment 3

[0035] Synthesis of trifluoromethyl-n-propyldimethylsilane:

[0036] Add 70ml of N-methylpyrrolidone (NMP) into a 150ml stainless steel autoclave, then add 0.78g of aluminum powder (100-200μm), and then add 5.46g of propyl dimethyl chlorosilane and 6.2g of trifluoro Methyl bromide, heated at 50°C for 5 minutes to initiate the reaction, reacted at room temperature for 3 hours, and filtered. The filtrate was distilled at atmospheric pressure, and the fraction at 105°C was collected.

[0037] The present embodiment lithium-ion battery uses electrolytic solution:

[0038] Take by weighing propylene carbonate accounting for 25% of the total mass of the electrolyte, mix with trifluoromethyl-n-propyldimethylsilane accounting for 45% of the total mass of the electrolyte, and make a mixed solvent; add a mass ratio of 3 in the mixed solvent: 1:2 LiBF 4 , LiTFSI and LiFSI mixed lithium salt to make the lithium salt concentration 1.8mol / L, and then add 1,4-butane sultone to get it. The...

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Abstract

The invention discloses an electrolyte for a lithium ion battery. The electrolyte comprises an organic solvent, lithium salt and an additive, wherein the usage amount of the additive accounts for 0.1%-3% of the total weight of the electrolyte; the concentration of the lithium salt in the electrolyte is 0.1-1.8 mol/L; the organic solvent comprises a carbonate solvent and a fluoro silane solvent; the structural formula of fluoro silane is as shown in the specification, R1, R2 and R3 are same or different C1-C6 linear alkyl. The electrolyte disclosed by the invention can be used under the condition of high voltage more than 4.5 V, thereby solving the problem that the lithium ion battery is reduced in the cycle property, storage property and safety property because the lithium ion battery is easy to decompose under the conditions of high voltage charging and discharging. Experiments prove that the electrolyte disclosed by the invention is difficult to decompose at high voltage and can achieve the capacity conservation rate more than 95% after being cycled for 100 times, thereby greatly enhancing the cycle property and magnification property of the lithium ion battery under the condition of high voltage.

Description

technical field [0001] The invention relates to an electrolyte solution for lithium ion batteries, belonging to the field of lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, large specific capacity, long cycle life, no memory effect, and environmental friendliness, and are widely used in mobile consumer electronics products. However, with the continuous expansion of the application of lithium-ion batteries in electric vehicles and other fields, higher requirements are put forward for the energy density and working voltage of lithium-ion batteries. [0003] In order to meet the requirements for the energy density and working voltage of lithium-ion batteries, researchers have made a lot of improvements to lithium-ion batteries and developed a variety of high-voltage cathode materials, such as: LiNi 0.5 mn 1.5 o 4 、LiCoPO 4 etc. (greater than 4.7V). However, the electrolyte of lithium-ion batteries is e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/0567
CPCH01M10/0569H01M2300/0034Y02E60/10
Inventor 杨书廷岳红云吕秀夯曹朝霞陶亮亮尹艳红闫晓宾
Owner HENAN NORMAL UNIV
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