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Flame retardant electrolyte applied to lithium ion power battery and lithium ion power battery prepared from same
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A power battery and electrolyte technology, applied in the field of lithium ion batteries, can solve the problems of high freezing point, application limitation, high viscosity, etc., and achieve the effects of high electrical conductivity, good flame retardant effect, and good flame retardant performance.
Active Publication Date: 2014-05-21
WANXIANG 123 CO LTD
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However, most of these have high viscosity, high freezing point, and low solubility of lithium salts. They are used as flame retardant additives, and the dosage is usually large (above 10%) to achieve the flame retardant effect, but the addition of a large amount of flame retardant additives will affect the performance of the battery. There is a great negative impact, and the application of these flame retardant additives is limited. Therefore, it is urgent to develop electrolytes that can achieve flame retardant properties without affecting the basic performance of lithium-ion batteries.
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Embodiment 1
[0021] Preparation of flame retardant electrolyte for lithium ion power battery:
[0022] Organic solvents: ethylenecarbonate, propylene carbonate, ethyl methyl carbonate and diethyl carbonate were mixed according to the volume ratio in Table 1, and then triethylamine, lithium hexafluorophosphate and lithium dioxalate borate were added according to the addition amount in Table 1 to form Film additives: vinylene carbonate and propylene sulfite, flame retardant: 2-ethoxy-2,4,4,6,6-pentafluoro-2λ 5 ,4λ 5 ,6λ 5 - [1,3,5,2,4,6]tripolyphosphazene, and heating at 55°C to dissolve each component, then add it at the end, mix well to obtain an electrolyte solution.
Embodiment 2
[0024] Preparation of flame retardant electrolyte for lithium ion power battery:
[0025] According to the method of Example 1, the electrolyte solution was prepared according to the volume ratio and addition amount in Table 1, wherein the flame retardant was 2,4-diethoxy-2,4,6,6-tetrafluorotripolyphosphazene.
Embodiment 3
[0027] Preparation of flame retardant electrolyte for lithium ion power battery:
[0028] According to the method of Example 1, the electrolyte solution was prepared according to the volume ratio and addition amount in Table 1, wherein the flame retardant was 2,2,4,4,6-pentafluoro-6-phenoxytripolyphosphazene.
[0029] Table 1
[0030] Component content and ratio Embodiment one Embodiment two Embodiment Three Lithiumhexafluorophosphate mol / L 0.5 0.9 1.2 Lithium dioxalate borate mol / L 0.1 0.3 0.1 Proportion of organic solvent 5:1:5:3 10:1:8: 6 6:1:7:8 Triethylamine % 1 2 1.3 Film former % Vinylene carbonate % 1.0 3.0 2.0 Propylene sulfite % 1.0 1.5 2.0 flame retardant % 2-Ethoxy-2,4,4,6,6-pentafluoro-2λ 5 ,4λ 5 ,6λ 5 -[1,3,5,2,4,6]trimeric phosphazene 5 2,4-diethoxy-2,4,6,6-tetrafluorotriphosphazene 6 2,2,4,4,6-Pentafluoro-6-phenoxytripolyphosphaz...
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Abstract
The invention relates to the technical field of lithiumion batteries, and in particular relates to a flame retardant electrolyte applied to a lithiumionpower battery and a lithiumionpower battery prepared from the same. The problem that in order to improve the safety of the lithium ion battery, the used electrolyte produces a serious negative impact on the battery of the existing lithium ion power batteryelectrolyte is solved. The electrolyte is composed of an organic solvent, an electrolyte, a film forming additive and a flame retardant additive. The molar concentration of the electrolyte in the organic solvent is 0.6 to 1.3mol / L. The weight percentages of the film forming additive and the flame retardant additive in the electrolyte are respectively 2 to 5% and 5 to 8%. The flame retardant additive is a cyclic trimerphosphazene compound. According to the invention, the flame retardant has the advantages of high boiling point and low viscosity; by combined with other components, the electrolyte has a good flame retardant effect; and on the basis that the battery performance of the power battery using the electrolyte is not affected, a good flame retardant performance is realized, and an expected objective is realized.
Description
technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a flame-retardant electrolyte for lithium-ion power batteries and a lithium-ion power battery prepared by using the same. Background technique [0002] The huge application prospects of lithium-ion power batteries in the field of electric vehicles and large-scale energy storage equipment and other power energy fields have attracted the attention of many scientists and business units. Due to the advantages of high energy density, high working voltage, long cycle life, high power, and environmental friendliness, lithium-ion batteries have become a hot research topic in the field of new energy. With the rapid development of lithium-ion batteries and the demand for large-capacity lithium-ion batteries for electric vehicles, it is urgent to develop lithium-ion power batteries with high safety, high capacity, high power, long life and environmental protection. At present...
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