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Lithium ion battery electrolyte suitable for quick charging and lithium ion battery

An electrolyte and lithium salt technology, applied in the field of lithium-ion battery materials, can solve the problems of long charging time and poor low-temperature performance, and achieve the effects of ensuring fast delivery, reducing charging impedance, and inhibiting dissolution

Active Publication Date: 2020-06-05
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of long charging time and poor low-temperature performance of existing lithium-ion batteries, the present invention provides an electrolyte for high-voltage lithium-ion batteries suitable for fast charging and a lithium-ion battery. Excellent cycle performance, at the same time it also has good high temperature storage and low temperature charge and discharge performance

Method used

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  • Lithium ion battery electrolyte suitable for quick charging and lithium ion battery
  • Lithium ion battery electrolyte suitable for quick charging and lithium ion battery
  • Lithium ion battery electrolyte suitable for quick charging and lithium ion battery

Examples

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preparation example Construction

[0044] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0045] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

[0046] The structure of the lithium salt compound shown in formula 1 involved in the following examples and comparative examples is as follows:

[0047]

[0048] The structure of the imidazole carboxylate compounds shown in formula 2 involved in...

Embodiment 1

[0051] Mix the solvent ethylene carbonate / propylene carbonate / diethyl carbonate / propyl propionate in a mass ratio of 20:15:20:45, and add 0.5% of A1 and 0.8% of B1 and 0.5% LiPF 2 o 2 As an additive, 1 mol / L lithium hexafluorophosphate was finally added to obtain the electrolyte solution of Example 1.

[0052] The electrolyte solution was injected into the non-liquid-injected cell comprising the positive electrode sheet, the negative electrode sheet and the separator to make a lithium ion battery, and the battery of Example 1 was obtained.

Embodiment 2-13 and comparative example 1-6

[0054] The preparation method of other embodiment and comparative example is the same as embodiment 1, and difference only is that the material of each component is different, specifically as shown in table 1 below:

[0055] The composition of the electrolytic solution of table 1 embodiment 1-13 and comparative example 1-6

[0056]

[0057] Electrochemical performance test is carried out to the lithium ion battery of above comparative example and embodiment gain:

[0058] 25°C normal temperature cycle test: put the batteries obtained in Examples 1-13 and Comparative Examples 1-6 in an environment of (25±2)°C, and let them stand for 2-3 hours until the battery body reaches (25±2)°C , the battery is charged according to 5C constant current with a cut-off current of 0.05C. After the battery is fully charged, it is left for 5 minutes, and then discharged at a constant current of 1C to a cut-off voltage of 3.0V. Record the highest discharge capacity of the first 3 cycles as the ...

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Abstract

The invention provides a lithium ion battery electrolyte suitable for quick charging and a lithium ion battery. By adding a lithium salt compound shown in the formula 1, an imidazole carboxylic estercompound shown in the formula 2 and the lithium difluorophosphate into the electrolyte, when the electrolyte is applied to the lithium ion battery, the high-voltage lithium ion battery suitable for high-rate charging and discharging can have excellent high-temperature storage and low-temperature discharging performance at the same time, wherein the sulfur-oxygen bonds and phosphorus-oxygen bonds in the lithium salt compound shown in the formula 1 jointly form a firm solid electrolyte interface film at a negative electrode, so that the oxidative decomposition of the electrolyte during high-ratecharging and discharging is effectively inhibited; the lithium difluorophosphate can reduce the charging impedance of the negative electrode, so that the sitation that the lithium ions are rapidly transferred in the electrolyte is guaranteed; and meanwhile, the imidazole carboxylate compound shown in the formula 2 can generate a complexing action on the surface of the positive electrode to inhibit the dissolution of metal ions of the positive electrode, so that the polarization side reaction in a battery cell during high-rate charging and discharging is reduced.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to an electrolyte solution for a lithium-ion battery and a lithium-ion battery suitable for fast charging. Background technique [0002] In recent years, lithium-ion batteries have been widely used in smartphones, tablet computers, smart wearables, power tools, and electric vehicles. With the acceleration of the pace of life and the development of electronic products, consumers have more urgent needs for shortening the charging time of lithium-ion batteries and improving the energy density of lithium-ion batteries, and accordingly put forward higher requirements for the charging speed and voltage of lithium-ion batteries; At the same time, considering that the working environment of electronic products is different, for example, batteries cannot be discharged normally in cold regions, which requires lithium-ion batteries to have excellent low-temperature perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0091Y02E60/10
Inventor 母英迪王龙王海李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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