Non-aqueous electrolyte and lithium ion battery

A non-aqueous electrolyte and lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve problems affecting battery power characteristics, lithium-ion battery rate performance decline, and reduce battery power characteristics, so as to improve oxidation stability and enhance ion conductivity efficiency and improve cycle performance

Active Publication Date: 2020-03-24
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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Problems solved by technology

However, the use of positive electrode additives often leads to a decrease in the rate performance of lithium-ion batteries, thereby affecting the power characteristics of the battery, such as common positive electrode film-forming additives vinylene carbonate (VC) and 1,3-propane sultone (1, 3-PS), 1,3-propene sultone (PES) will reduce the power characteristics of the battery

Method used

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  • Non-aqueous electrolyte and lithium ion battery

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preparation example Construction

[0061] 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:

[0062] S1: Add the electrolyte lithium salt into the solvent, stir to completely dissolve the lithium salt, and obtain a lithium salt solution;

[0063] S2: adding functional additives and optionally other additives to the above lithium salt solution, and mixing uniformly to obtain the lithium ion battery electrolyte.

[0064] 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.

[0065] According to some embodiments of the present invention, the dissolution temperature of the electrolyte lithium salt in the organic solvent is 10-20°C.

[0066] The selection and consumption of the electrolyte lit...

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Abstract

The invention provides a non-aqueous electrolyte and a lithium ion battery. The non-aqueous electrolyte comprises a solvent, an electrolyte lithium salt and a functional additive, and the functional additive comprises pentafluorophenyl vinyl sulfonate, 3-trifluoromethyl-5-methoxybenzonitrile and lithium difluorophosphate. When the electrolyte disclosed by the invention is applied to the lithium ion battery of a nickel-cobalt-manganese ternary material/graphite system, the high-voltage resistance of the lithium ion battery is improved, and the rate capability, the normal-temperature cycle, thehigh-temperature cycle and the high-temperature storage performance of the lithium ion battery are remarkably improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a non-aqueous electrolyte for lithium-ion batteries of a nickel-cobalt-manganese ternary material / graphite system and a lithium-ion battery. Background technique [0002] The traditional lithium-ion battery material uses lithium cobalt oxide as the positive electrode, and graphite as the negative electrode. The way to increase the energy density of this type of lithium-ion battery is usually achieved by increasing the operating voltage of the battery, and the high operating voltage will cause the electrolyte to The rapid decomposition of lithium cobalt oxide and the destruction of the structure of the lithium cobalt oxide material greatly reduce the cycle life of the battery, making it difficult to meet the needs of actual use. A large number of studies have confirmed that one of the most effective ways to develop high-energy-density lithium-ion batteries is to use ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M10/0525
CPCH01M10/0567H01M10/0568H01M10/0569H01M10/0525H01M2300/0025Y02E60/10
Inventor 邹志群余意
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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