Functional additives for non-aqueous electrolytes, non-aqueous electrolytes and lithium-ion batteries
A non-aqueous electrolyte and functional additive technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problems of inability to meet use requirements, poor high-pressure cycle performance and high-temperature storage performance, and achieve high-temperature storage performance. Improve, improve high pressure performance, improve the effect of circulation
Active Publication Date: 2020-12-29
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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Problems solved by technology
[0006] In view of the fact that the existing electrolyte cannot meet the requirements for the use of lithium-ion batteries with high-nickel ternary materials as the positive electrode, especially the high-voltage cycle performance and high-temperature storage performance of single-crystal high-nickel ternary materials / graphite lithium-ion batteries in the prior art are relatively low. poor problem, the present invention provides a new functional additive and non-aqueous electrolyte containing it
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[0062] According to some embodiments of the present invention, the preparation method of the lithium-ion battery electrolyte as described above, the preparation method includes the following steps:
[0063] S1: Add the electrolyte lithium salt into the solvent, stir to completely dissolve the lithium salt, and obtain a lithium salt solution;
[0064] S2: Add the functional additive of formula (I) and optionally other additives into the above lithium salt solution, and mix uniformly to obtain the lithium ion battery electrolyte.
[0065] Preferably, the solvent is purified. The purification refers to the removal of impurities and water from the solvent, preferably through molecular sieves and activated carbon. Described molecular sieve can adopt type, type or type.
[0066] According to some embodiments of the present invention, the dissolution temperature of the electrolyte lithium salt in the organic solvent is 10-20°C.
[0067] The selection and consumption of the e...
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Abstract
The invention provides a non-aqueous electrolyte functional additive, a non-aqueous electrolyte and a lithium-ion battery. The non-aqueous electrolyte comprises a solvent, an electrolyte lithium saltand a functional additive, wherein the functional additive is shown as a formula (I). When the electrolyte disclosed by the invention is applied to the lithium-ion battery of a high-nickel ternary material / graphite system, the high-voltage resistance of the battery is improved, and the normal-temperature cycle and high-temperature storage performance of the battery are remarkably improved.
Description
technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a novel functional additive, a non-aqueous electrolyte containing the same and a lithium-ion battery. 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 have been widely used in electronic products such as communication tools and notebook computers. With the application of lithium-ion batteries in electric vehicles and hybrid electric vehicles, people have put forward higher requirements for the energy density of lithium-ion batteries, especially the mass energy density; there are many ways to improve the energy density of batteries and improve the positive electrode materials. The gram capacity is an effective way. Among them, the current conventional method is to use a high-nickel ternary material as the positive electrode ...
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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 朱辉余意何凤荣
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD