Lithium ion battery electrolyte and lithium ion battery using same
A lithium-ion battery and electrolyte technology, which is applied in the field of lithium-ion battery electrolyte and lithium-ion batteries, can solve the problems of lithium-ion battery electrochemical performance deterioration, achieve excellent normal temperature cycle performance, and reduce gas production.
Inactive Publication Date: 2021-08-31
河源市联懋新材料有限公司
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Problems solved by technology
However, the high content of nickel metal in the ternary cathode material makes it highly oxidizable, which leads to the electrochemical oxidation reaction of the electrolyte on the surface of the cathode, and at the same time causes changes in the structure of the cathode material to cause reduction reactions of transition metals such as nickel and cobalt. And stripping, thus causing the deterioration of the electrochemical performance of lithium-ion batteries
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[0018] The present invention will be described in detail below in conjunction with specific preferred embodiments, so that the advantages and characteristics of the present invention can be more easily understood by those skilled in the art. These embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. limited.
[0019] A kind of ternary cathode lithium ion battery electrolyte, comprises non-aqueous organic solvent, lithium salt and additive, and described additive comprises cyclic sulfuric acid ester compound and fluoroethylene carbonate compound and vinylene sulfate, three (trimethylsilyl Two or more of the phospholipids.
[0020] Further, the non-aqueous organic solvent is selected from at least one of ethylene carbonate, propylene carbonate, fluoroethylene carbonate, ethyl methyl carbonate, dimethyl carbonate, and diethyl carbonate.
[0021] Further, the lithium salt in the electrolyte contains an inorganic lithium ...
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The invention discloses a lithium ion battery electrolyte and a lithium ion battery using the same. The lithium ion battery electrolyte comprises a non-aqueous organic solvent, a lithium salt and an additive, wherein the additive comprises a cyclic sulfate compound, a fluoroethylene carbonate compound, and two or more of vinylene sulfate and tris(trimethylsilyl) phosphate. The lithium ion battery using the electrolyte has excellent normal-temperature cycle performance, high-temperature cycle performance and long high-temperature storage life, the gas production rate in the high-temperature storage process can be remarkably reduced, and meanwhile, a positive electrode material of a positive electrode plate of the ternary lithium ion battery has good fluidity and has good adhesion with a foil material during coating.
Description
Technical field: [0001] The invention relates to the technical field of battery manufacturing and processing, in particular to a lithium-ion battery electrolyte and a lithium-ion battery using the electrolyte. Background technique: [0002] At present, the market prospect of power lithium-ion batteries for electric vehicles is broad, and ternary power batteries with high energy density are increasingly recognized by various car manufacturers and battery manufacturers, and the demand is large. [0003] In order to ensure long battery life, ternary power batteries are also constantly developing towards nickel-rich direction. Nickel-rich here refers to the continuous increase of Ni content in the ternary materials used. Endurance has put forward higher requirements. The main purpose is to improve the stability of the Ni element, which is definitely better for ordinary ternary materials. In order to improve the energy density of lithium-ion batteries, it is one of the effective...
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IPC IPC(8): H01M10/0567H01M10/0569H01M10/0568H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0569H01M10/0568H01M10/0525H01M10/4235H01M2300/0025Y02E60/10
Inventor 余志文陈水彬付诗清陈鑫
Owner 河源市联懋新材料有限公司