A kind of lithium-ion battery non-aqueous electrolytic solution and lithium-ion battery comprising the electrolytic solution

A non-aqueous electrolyte and lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve the problems that affect the actual use of batteries, the viscosity of the electrolyte is high, and the battery cycle performance and low-temperature performance cannot be considered.

Active Publication Date: 2022-02-11
ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when most additives improve the high-temperature performance of the battery, they often bring defects such as excessive viscosity of the electrolyte or large film-forming resistance, which cannot take into account the cycle performance and low-temperature performance of the battery, which greatly affects the actual use of the battery.

Method used

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  • A kind of lithium-ion battery non-aqueous electrolytic solution and lithium-ion battery comprising the electrolytic solution
  • A kind of lithium-ion battery non-aqueous electrolytic solution and lithium-ion battery comprising the electrolytic solution
  • A kind of lithium-ion battery non-aqueous electrolytic solution and lithium-ion battery comprising the electrolytic solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 1) Preparation of non-aqueous electrolyte:

[0049] In a 99.999% nitrogen glove box, mix ethylene carbonate (EC), ethylmethyl carbonate (EMC) and diethyl carbonate (DEC) in a mass ratio of 1:1:1, and then add lithium hexafluorophosphate to a concentration of 1.0mol / L; In the above mixed solution containing lithium salt, add the components shown in the mass percentage of Example 1 in Table 1, and mix evenly.

[0050] 2) Production of lithium-ion batteries:

[0051] The electrolyte was injected into the ternary material Li(Ni 0.5 co 0.2 mn 0.3 )O 2 In a soft-packed lithium-ion battery with the positive electrode and the graphite material as the negative electrode, charge with a constant current of 0.05C for 1 hour, then charge with a constant current of 0.2C to 4.0V, and then charge to 4.2V with a current of 0.05C, and finally put the battery in 55 Aged in an oven at ℃ for 24h, and discharged to 3.0V with a constant current of 0.2C.

[0052] 3) Li-ion battery perfor...

Embodiment 2～14

[0063] This embodiment is used to illustrate the lithium-ion battery non-aqueous electrolyte disclosed by the present invention and its preparation method, including most of the operating steps in Example 1, the difference being:

[0064] In the preparation step of the non-aqueous electrolytic solution, the non-aqueous electrolytic solution is added with the components shown in Table 1, Example 2-Example 14 in mass percentage.

[0065] The specific test method is consistent with that of Example 1, and the test results are shown in Table 2.

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Abstract

The invention discloses an electrolytic solution for a lithium ion battery. The electrolytic solution comprises a non-aqueous organic solvent, an electrolyte lithium salt, a conventional additive and a functional additive, and the functional additive is a phosphorous-containing diimidazole compound. After adding this additive to the electrolyte, the battery can form an interfacial film with excellent electrochemical stability and ion conductivity at the interface of the positive electrode and the negative electrode material during the formation stage, which can effectively improve the cycle performance, high temperature cycle performance and high temperature of the lithium ion battery. storage performance.

Description

[technical field] [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery non-aqueous electrolyte and a lithium ion battery. [Background technique] [0002] At present, lithium-ion batteries have been widely used in people's daily life, and their demand is gradually increasing. In order to adapt to the rapid development of power vehicles, energy storage devices, and digital electronic devices, improving the energy density and safety performance of lithium-ion batteries has become a key development direction for relevant researchers. [0003] In general, increasing the gram capacity density and operating voltage window of positive and negative electrode materials can significantly increase the energy density of lithium-ion batteries. Compared with the development of positive and negative electrode materials, finding an electrolyte suitable for matching these materials has become a bottleneck restricting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/058H01M10/0525H01M10/42
CPCH01M10/0567H01M10/058H01M10/0525H01M10/4235Y02E60/10Y02P70/50
Inventor 杨富杰毛冲王霹霹黄秋洁梁洪耀欧霜辉戴晓兵
Owner ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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