Lithium battery electrolyte and preparation method thereof

An electrolyte and lithium battery technology, applied in the field of lithium battery electrolyte and its preparation, can solve the problems of increased aging of lithium batteries, degradation of lithium battery performance, easy combustion or explosion, etc., and achieves excellent safety performance and high-temperature cycle performance. The effect of gas production and repairing damage

Inactive Publication Date: 2018-06-08
SHENZHEN ANDING NEW ENERGY TECH DEV CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the electrolyte is the main reason affecting the high temperature performance of the lithium battery, because the decomposition of the conventional electrolyte is accelerated in a high temperature environment, which leads to the aging of the lithium battery and shortens the life of the lithium battery by 30-60%.
Understandably, conventional electrolytes are usually LiPF 6 Carbonate organic solution system, LiPF 6 It will start to decompose at 60°C, and HF will corrode the current collector, SEI film (solid electrolyte mask) and electrode active materials, resulting in rapid degradation of lithium battery performance, and even flammability or explosion in severe cases

Method used

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  • Lithium battery electrolyte and preparation method thereof
  • Lithium battery electrolyte and preparation method thereof
  • Lithium battery electrolyte and preparation method thereof

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preparation example Construction

[0032] see figure 1 , the present invention also provides a kind of preparation method of lithium battery electrolyte, comprises the following steps:

[0033]1) Molecular sieves are used to remove moisture and impurities in the carbonate organic solvent, so that the water content of the carbonate organic solvent is ≤5ppm and the purity is ≥99.995%;

[0034] 2) Use a refrigeration device to lower the carbonate organic solvent from room temperature to 3-5°C and control the time required for cooling to 15-25min, and then keep it warm at 3-5°C for 10-20min;

[0035] 3) Slowly add the conductive lithium salt to the carbonate organic solvent and ensure that the temperature during the addition process is lower than 10°C, and the adding time of the conductive lithium salt is controlled at 60-90min;

[0036] 4) Add functional additives and benzene p-diphosphate compounds as high-temperature stabilizers and mix and stir for 20-30 minutes, and make the conductive lithium salt, the funct...

Embodiment 1

[0042] In this embodiment, the organic solvent is a carbonate-based organic solvent mixed with various carbonates. Specifically, the carbonate-based organic solvent contains carbonic acid with a mass fraction of 25%, 45%, 20% and 10% respectively. Ethyl methyl ester, dimethyl carbonate, ethylene carbonate and propylene carbonate; LiPF is used for conductive lithium salt 6 with LiBF 4 The functional additive selects vinylene carbonate and biphenyl for use; the p-diphosphate benzene compound selects p-diphosphate methyl benzene as the high-temperature stabilizer, and its structural formula is as follows:

[0043]

[0044] LiPF 6 、LiBF 4 The mass fractions of , vinylene carbonate, biphenyl and methyl p-diphosphate relative to the total mass of the electrolyte are 12%, 2%, 5%, 0.8% and 1.5%, respectively.

[0045] In the preparation process, first, ethyl methyl carbonate, dimethyl carbonate, ethylene carbonate and propylene carbonate are respectively removed from moisture an...

Embodiment 2

[0047] The preparation method is basically the same as in Example 1, except that the p-diphosphate benzene compounds used as the high-temperature stabilizer are selected from p-diphosphate ethyl benzobenzene, and its structural formula is as follows:

[0048]

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Abstract

The invention provides lithium battery electrolyte, which is prepared from carbonic ester type organic solvents (accounting for 10 to 18 mass percent of the total mass of the electrolyte), conductivelithium salts (accounting for 2 to 15 mass percent of the total mass of the electrolyte) and functional additive and p-diphenyl phosphate compounds (accounting for 0.01 to 15 mass percent of the totalmass of the electrolyte). The invention also provides a preparation method of the lithium battery electrolyte. The method is used for preparing the lithium battery electrolyte.

Description

【Technical field】 [0001] The invention belongs to the technical field of lithium batteries, in particular to a lithium battery electrolyte and a preparation method thereof. 【Background technique】 [0002] Lithium batteries have been widely used because of their ability to store energy, high energy density, long cycle life, and environmental friendliness. In recent years, with the increasingly serious shortage of fossil energy and environmental pollution, lithium batteries have been popularized and applied in the automotive industry. However, the operating temperature range of lithium batteries is narrow, and when the temperature is higher than 60°C, the capacity decays quickly, and it is easy to burn or explode. In actual use, the local temperature of lithium batteries is higher than 60°C during high current discharge, so it is very necessary to study and improve the high temperature performance of lithium batteries. [0003] In the prior art, the electrolyte is the main r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0566H01M10/0567H01M10/0569H01M10/42H01M10/0525
CPCH01M10/0525H01M10/0566H01M10/0567H01M10/0569H01M10/4235Y02E60/10
Inventor 饶睦敏彭小坡林春明王林刘弦开田雷雷李金林
Owner SHENZHEN ANDING NEW ENERGY TECH DEV CO LTD
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