A kind of nonaqueous electrolytic solution for lithium ion battery and lithium ion battery using the nonaqueous electrolytic solution
A non-aqueous electrolyte, lithium-ion battery technology, applied in non-aqueous electrolytes, battery electrodes, secondary batteries, etc., can solve the problems of high impedance, inability to balance high-temperature performance and low-temperature performance, and lack of high-temperature effects of low-impedance additives. Achieve the effects of low membrane impedance, excellent high temperature storage performance, and improved toughness
Active Publication Date: 2021-11-09
ZHUHAI COSMX BATTERY CO LTD
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Problems solved by technology
[0003] Most lithium-ion battery products have the problem that high-temperature performance and low-temperature performance cannot be balanced. For this reason, additives are usually added to the electrolyte to improve the high-low temperature performance of lithium-ion batteries. However, when general additives have better high-temperature effects, the impedance will be lower. Larger, and the high temperature effect of low impedance additives is lacking, so it is necessary to optimize the combination of additives to obtain better high and low temperature performance
Method used
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Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1-13 and comparative example 2-9
[0082] The preparation process of Examples 1-13 and Comparative Examples 2-9 is the same as that of Comparative Example 1, the only difference lies in the components and contents of the electrolyte solution, and the specific added components and contents are shown in Table 1. The test results are listed in Table 2.
[0083] It can be seen from the above Table 2 that the batteries prepared in the examples of the present application have achieved better electrical properties, and the specific analysis is as follows:
[0084] Through the comparison of Comparative Example 1 and Comparative Examples 2-10, it can be found that on the basis of the blank electrolyte, the compound shown in the additive formula 1, the nitrile compound and vinyl sulfate can improve the cycle performance and high-temperature storage performance of the battery, but both Deterioration of low-temperature cycle performance.
[0085] By comparing Examples 2-10 and Examples 1-6, it can be found that the compou...
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Abstract
The invention provides a nonaqueous electrolytic solution for a lithium ion battery and a lithium ion battery using the nonaqueous electrolytic solution. The non-aqueous electrolytic solution includes (a) lithium salt, (b) non-aqueous organic solvent, (c) at least one compound shown in formula 1; wherein, the non-aqueous electrolytic solution also includes the following components (d ) and (e): (d) a nitrile compound comprising at least one of 1,3,6-hexanetrinitrile, glycerol trinitrile, 3-methoxypropionitrile, and (e ) vinyl sulfate. Through the synergistic effect between them, while protecting the positive electrode, the negative electrode also plays a certain protective role, and the membrane impedance is low, and the battery has better high-temperature storage performance, cycle performance and low-temperature charge-discharge performance.
Description
technical field [0001] The invention belongs to the technical field of electrolyte solution for lithium ion batteries, and in particular relates to a nonaqueous electrolyte solution for lithium ion batteries and a lithium ion battery using the nonaqueous electrolyte solution. Background technique [0002] Since its commercialization, lithium-ion batteries have been widely used in digital, energy storage, power, military aerospace and communication equipment and other fields due to their light weight, high specific energy, no memory effect, and good cycle performance. With the wide application of lithium-ion batteries, consumers have put forward higher requirements for the energy density, cycle life, high temperature performance, safety and other performance of lithium-ion batteries. [0003] Most lithium-ion battery products have the problem that high-temperature performance and low-temperature performance cannot be balanced. For this reason, additives are usually added to t...
Claims
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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025H01M4/587H01M4/525Y02E60/10H01M4/131H01M4/133H01M4/134H01M4/366H01M4/386H01M4/505H01M10/0569H01M2004/027H01M2004/028
Inventor 曾长安李素丽
Owner ZHUHAI COSMX BATTERY CO LTD