A kind of nonaqueous electrolytic solution and lithium ion battery for lithium ion battery
A non-aqueous electrolyte and lithium-ion battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of increasing negative electrode impedance, increasing battery impedance, and degrading low-temperature performance
Active Publication Date: 2021-05-14
SHENZHEN CAPCHEM TECH CO LTD
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Problems solved by technology
However, scientific and technical workers in this field have found in their research that the triple-bond phosphate additive can not only form a film on the positive electrode, but also form a film on the negative electrode. performance
[0006] Cyclic unsaturated carboxylic acid anhydrides have been used as lithium battery electrolyte additives for a long time in some related documents and patents. Cyclic unsaturated carboxylic acid anhydrides have similar functional characteristics to triple-bond phosphate esters and can significantly improve high-temperature performance, but At the same time, it will increase the battery impedance, degrade the low-temperature performance, and inhibit the application of non-aqueous lithium-ion batteries under low temperature conditions.
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[0042] In this example, the electrolyte solution was prepared according to the components and proportions shown in Table 1, wherein a number of non-aqueous electrolyte solutions for lithium-ion batteries of the present application and a number of comparative examples were designed, see Table 1 for details.
[0043] The lithium salt of this example is lithium hexafluorophosphate. It can be understood that the lithium salt used in this example is only a specific embodiment, and other commonly used lithium salts in this field, such as LiBF 4 , LiBOB, LiDFOB, LiPO 2 f 2 , LiSbF 6 , LiAsF 6 , LiN(SO 2 CF 3 ) 2 , LiN(SO 2 C 2 f 5 ) 2 , LiC(SO 2 CF 3 ) 3 and LiN(SO 2 F) 2 , can also be used in this example, and is not specifically limited here.
[0044] The preparation method of the electrolyte solution of this example is: according to the volume ratio of EC / EMC / DEC=1 / 1 / 1 (volume ratio), prepare non-aqueous organic solvent, then add the lithium hexafluorophosphate tha...
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Abstract
The application discloses a non-aqueous electrolytic solution for a lithium ion battery and the lithium ion battery. The non-aqueous electrolytic solution of the present application includes unsaturated phosphoric acid ester compounds and cyclic unsaturated carboxylic acid anhydride compounds, and the unsaturated phosphoric acid ester compounds have a structure shown in formula one, formula one: wherein, R1, R2, R3 are independently selected from hydrocarbon groups with 1-5 carbon atoms, and at least one of R1, R2, and R3 is an unsaturated hydrocarbon group containing a double bond or a triple bond; the unsaturated cyclic carboxylic acid anhydride compound has the formula II The structure is shown in Formula 2: wherein, R4 is selected from an alkenylene group with 2-4 carbon atoms or an alkenylene group with 2-4 carbon atoms substituted by fluorine. The non-aqueous electrolyte solution of the present application, through the synergistic effect of the first compound and the second compound, on the one hand has excellent high-temperature cycle performance and storage performance, and at the same time has low impedance and excellent low-temperature performance.
Description
technical field [0001] The present application relates to the field of lithium-ion battery electrolytes, in particular to a non-aqueous electrolyte for lithium-ion batteries and lithium-ion batteries. Background technique [0002] Lithium-ion batteries have the characteristics of high specific energy, high specific power, and long cycle life. At present, they are mainly used in the fields of 3C digital consumer electronics products, new energy vehicles and energy storage fields. With the continuous improvement of the mileage requirements of new energy vehicles and the continuous miniaturization of digital consumer electronics products, high energy density has become the main development trend of lithium-ion batteries. Improving the working voltage of lithium-ion batteries is an effective way to increase the energy density of batteries. [0003] Increasing the operating voltage of lithium-ion batteries often leads to performance degradation. Because under high voltage, on t...
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IPC IPC(8): H01M10/0566H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0566H01M10/0567Y02E60/10
Inventor 石桥林木崇曾长安
Owner SHENZHEN CAPCHEM TECH CO LTD