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A kind of lithium ion battery electrolyte and lithium ion battery containing the electrolyte

A lithium ion battery and electrolyte technology, applied in the field of lithium ion batteries, can solve the problems of high temperature storage and poor cycle performance of electrolyte, and achieve the effects of excellent high temperature cycle performance, reducing dissolution and improving stability

Active Publication Date: 2021-01-05
SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a lithium-ion battery electrolyte to improve the stability of the interface between the electrolyte and the positive and negative electrodes and reduce the battery life. Capacity decay and high-temperature gas generation during use, thereby improving the high-temperature storage performance and high-temperature cycle performance of lithium-ion batteries

Method used

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  • A kind of lithium ion battery electrolyte and lithium ion battery containing the electrolyte
  • A kind of lithium ion battery electrolyte and lithium ion battery containing the electrolyte
  • A kind of lithium ion battery electrolyte and lithium ion battery containing the electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Electrolyte preparation:

[0039] In a glove box filled with argon (moisture content 6 , and stirred until it was completely dissolved, that is, the lithium-ion battery electrolyte of Example 1 was obtained.

[0040] Preparation of lithium-ion batteries:

[0041] The positive electrode active material LiNi 0.6 co 0.2 mn 0.2 o 2 , the conductive agent acetylene black, and the binder polyvinylidene fluoride (PVDF) in the N-methylpyrrolidone solvent system in a mass ratio of 95:3:2 are fully stirred and mixed evenly, and then coated on Al foil, dried, and cooled. Press to obtain the positive electrode sheet, and its compacted density is 3.5g / cm 3 .

[0042] Negative electrode active material graphite, conductive agent acetylene black, binder styrene-butadiene rubber (SBR), thickener sodium carboxymethyl cellulose (CMC) were mixed in a deionized water solvent system according to the mass ratio of 96:2:1:1 After fully stirring and mixing evenly, it is coated on Cu foi...

Embodiment 2～22

[0045] The preparation of embodiment 2~22 and comparative example 1~6 electrolyte:

[0046] The preparation method of the electrolyte solution of Examples 2-22 and Comparative Examples 1-6 is similar to the preparation method of the electrolyte solution of Example 1, that is, in a glove box (moisture content<10ppm, oxygen content<1ppm) filled with argon, according to The solvents listed in Table 1 and the proportions of various additives were prepared, wherein the addition amount of lithium hexafluorophosphate was 12.5%. Wherein, the listed additives of B1-B13 respectively correspond to the following compounds:

[0047] i.e. R 1 = R 2 = phenyl, R 5 = methylene;

[0048] i.e. R 1 = R 2 = p-fluorophenyl, R 5 = methylene;

[0049] i.e. R 1 = R 2 = ethyl, R 5 = methylene;

[0050] i.e. R 1 = R 2 = benzyl, R 5 = methylene;

[0051] i.e. R 1 = R 2 = Allyl, R 5 = methylene;

[0052] i.e. R 1 = R 2 =2-trifluoromethylphenyl, R 5 = methylene;

[0053]...

Embodiment 2～18

[0060] Preparation of Li-ion batteries (ternary NCM batteries) in Examples 2-18 and Comparative Examples 1-5:

[0061] The preparation method of the lithium-ion battery of Examples 2-18 and Comparative Examples 1-5 is similar to that of Example 1, and the positive electrode active material used is consistent with the ternary positive electrode material (NCM) used in Example 1, and then Inject the electrolytes corresponding to Examples 2-18 and Comparative Examples 1-5 respectively, and undergo processes such as packaging, shelving, chemical formation, aging, secondary packaging, and volume separation to obtain Examples 2-18 and Comparative Examples 1-5 High-nickel ternary cathode material soft pack lithium-ion battery.

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Abstract

The invention relates to the technical field of lithium-ion batteries, in particular to an electrolyte of the lithium-ion battery and the lithium-ion battery containing the electrolyte. The electrolyte comprises a lithium salt, a non-aqueous organic solvent and an additive, wherein the additive comprises a film-forming additive A and a stabilizing additive B; the stabilizing additive B is a chainlike disulfonic acid ester compound as shown in a formula I and / or a formula II; and the film-forming additive A forms an SEI film on a negative electrode surface of the battery and the side reaction of a negative electrode interface and the electrolyte is reduced, so that the film-forming additive A is an necessary precondition that the battery has relatively good cycle performance. The stabilizing additive B can form a CEI film on a positive electrode surface, the activity of a positive electrode interface and the electrolyte is inhibited, direct contact oxidation of a positive electrode and the electrolyte is reduced, meanwhile, the structure stability of a positive electrode material is improved and the structure is not easy to collapse and crush due to generation of the stress, so that the electrolyte has excellent high-temperature storage performance and high-temperature cycle performance through combination of the additive A and the additive B.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery electrolyte and a lithium ion battery containing the electrolyte. Background technique [0002] At present, lithium-ion batteries are widely used in digital products, electric vehicles and other fields, and people have put forward higher requirements for the energy density of lithium-ion batteries. In order to improve the energy density of the lithium-ion battery, two schemes are mainly adopted in the prior art, one is to increase the charge cut-off voltage of the lithium-ion battery, for example, the charge cut-off voltage is increased to above 4.35V; the other is to increase the capacity of the positive electrode material, such as High-nickel ternary cathode material is used. However, both the high-voltage scheme and the high-capacity material scheme put forward higher requirements on the cycle performance and high-temperature storage perfor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/0568H01M10/4235H01M2300/0025Y02E60/10
Inventor 朱学全周文超郑洋冯博鑫
Owner SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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