Non-aqueous electrolyte for lithium ion battery and lithium ion battery comprising same

A non-aqueous electrolyte and lithium-ion battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as large impedance, inability to balance high-temperature performance and low-temperature performance, and lack of high-temperature effect of low-impedance additives to achieve reduction Effects of dissolution and high-temperature storage performance

A non-aqueous electrolyte and lithium-ion battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as large impedance, inability to balance high-temperature performance and low-temperature performance, and lack of high-temperature effect of low-impedance additives to achieve reduction Effects of dissolution and high-temperature storage performance

CN112803070AInactive Publication Date: 2021-05-14ZHUHAI COSMX BATTERY CO LTD
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  • Non-aqueous electrolyte for lithium ion battery and lithium ion battery comprising same
  • Non-aqueous electrolyte for lithium ion battery and lithium ion battery comprising same
  • Non-aqueous electrolyte for lithium ion battery and lithium ion battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-11 and comparative example 2-5

[0064] The preparation process of Examples 1-11 and Comparative Examples 2-5 is the same as Comparative Example 1, the only difference being that the components and contents of the electrolyte are different, specifically:

[0065]In a glove box filled with argon gas and qualified water and oxygen content, mix ethylene carbonate, diethyl carbonate, and ethyl methyl carbonate in a mass ratio of 30:50:20 (the solvent and additives need to be normalized together) , and then quickly add additives (at least one of the compounds shown in formula 1, at least one of the compounds shown in formula 2, vinyl sulfate, lithium bisfluorosulfonyl imide) to it, and mix the solution in- Freeze at a low temperature of about 10°C for 2-5h, and then quickly add 12.5wt% fully dried lithium hexafluorophosphate (LiPF 6 ), stirred evenly, and obtained the electrolytes of Examples 1-11 and Comparative Examples 2-5 after passing the moisture and free acid tests. The specific components and contents add...

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Abstract

The invention provides a non-aqueous electrolyte for a lithium ion battery and the lithium ion battery comprising the non-aqueous electrolyte. The non-aqueous electrolyte comprises lithium salt and a non-aqueous organic solvent, and further comprises at least one of compounds as shown in a formula 1 and a compound as shown in a formula 2; according to the present invention, the compound represented by the formula 1 can form the low impedance protection film on the positive electrode and the negative electrode, the compound represented by the formula 2 provides the protection effect on the positive electrode, and through the synergistic effect, the positive electrode is protected while the negative electrode provides the certain protection effect, such that the battery has advantages of excellent cycle performance, excellent high temperature storage performance and excellent low temperature 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 including 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 because of 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. To improve the energy density, on the one hand, it is possible to increase the charging voltage of the positive electrode, or to use a silicon negative electrode with better capacity. Mo...

Claims

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Application Information

Patent Timeline
14 May 2021
Publication
CN112803070A
IPC
H01M10/0567; H01M10/0525
CPC
H01M10/0525; H01M10/0567; Y02E60/10
Inventors
曾长安; 李素丽