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

A non-aqueous electrolyte, lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve the problems of storage performance and safety performance decline, easy expansion, etc., to achieve the effect of protecting silicon-based active materials, alleviating cracks, and improving cycle performance

Active Publication Date: 2021-05-25
ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the existing silicon-based negative electrode lithium-ion battery has poor cycle performance and storage performance under high temperature environment, the present invention provides a non-aqueous electrolyte solution for lithium-ion battery, which effectively solves the problem of silicon-based negative electrode lithium-ion battery Easy expansion under high temperature conditions leads to the problem of decreased battery cycle performance, storage performance and safety performance. On the other hand, a lithium-ion battery using the non-aqueous electrolyte is provided

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

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Experimental program
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Embodiment 1

[0024] 1) Preparation of non-aqueous electrolyte:

[0025] 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.

[0026] 2) Production of lithium-ion batteries:

[0027] Inject the electrolyte into the ternary material Li(Ni 0.6 co 0.2 mn 0.2 )O 2 For the positive electrode, SiO X (0<X<1) and a graphite composite material as the negative electrode of the soft-packed lithium-ion battery, charge at a constant current of 0.05C for 1 hour, then charge at a constant current of 0.2C to 4.0V, and charge at 0.05C to 4.2V, Finally, put the battery in a 55°C oven for aging for 24 hours, and discharge it to 3V at a constant current of 0.2C.

[0028] 3) Li-ion battery performance t...

Embodiment 2～14

[0039] 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:

[0040] 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.

[0041] 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 a lithium-ion battery non-aqueous electrolyte and a lithium-ion battery containing the electrolyte. The electrolyte contains a non-aqueous organic solvent, an electrolyte lithium salt, a conventional additive and a functional additive. The functional additive is Soluble silicon-containing organolithium salt. After adding the additive to the electrolyte, the battery can form an SEI film with excellent mechanical properties at the interface of the silicon negative electrode material during the formation stage, which can alleviate the rupture of the silicon negative electrode particles due to volume expansion during the charging process, thereby improving the cycle performance of the battery and 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] With the rapid development of new energy technologies all over the world, more and more electrochemical energy storage devices have gradually appeared in people's daily life, and the products involve mobile phones, cameras, laptop computers, and power vehicles. Among these electrochemical devices, rechargeable lithium-ion batteries have gained unanimous praise due to their high energy density. In recent years, the demand for lithium-ion batteries with high energy density has gradually increased. Non-carbon negative electrode active materials such as silicon-based negative electrode active materials have been widely used to improve battery capacity, among which SiO active materials have been studied more. Although the energy density of a single lith...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/42H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 杨富杰毛冲戴晓兵王霹霹梁洪耀黄秋洁于智力
Owner ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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