Cyclic phosphamido lithium salt and preparation method thereof, electrolyte additive, electrolyte and battery

A cyclic phosphoramidite-based, electrolyte technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve the problems of high LUMO, low molecular stability, difficult to decompose into films, etc., to achieve High stability, effect of improving discharge performance

Pending Publication Date: 2021-06-11
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current additives still have certain problems
For example, some compounds have too high LUMO and are not easy to decompose into films, or although they have low LUMO, their molecular stability is not too high, so there are certain problems in use and storage.

Method used

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  • Cyclic phosphamido lithium salt and preparation method thereof, electrolyte additive, electrolyte and battery
  • Cyclic phosphamido lithium salt and preparation method thereof, electrolyte additive, electrolyte and battery
  • Cyclic phosphamido lithium salt and preparation method thereof, electrolyte additive, electrolyte and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] (1) Preparation of electrolyte:

[0067] In an argon glove box, 12% by weight of lithium hexafluorophosphate was dissolved in a non-aqueous solvent, the non-aqueous solvent being ethylene carbonate and diethyl carbonate, and the mass ratio of ethylene carbonate and diethyl carbonate was 1:1 , and then add 0.1% by weight of compound II to obtain the lithium-ion battery non-aqueous electrolyte of the present embodiment, denoted as C1; wherein the compound II is

[0068] (2) Preparation of lithium ion battery:

[0069] The positive active material (LiNi 0.5 co 0.2 mn 0.3 o 2 ), acetylene black, and polyvinylidene fluoride in a weight ratio of 90:5:5 and then pressed on aluminum foil to obtain a positive electrode sheet; metal lithium sheet is used as a negative electrode sheet; PE / PP composite diaphragm is used as an ion exchange membrane, Using the non-aqueous electrolyte C1 of this embodiment, a button-type battery S1 is manufactured by a conventional method in th...

Embodiment 2

[0071] The same steps as in Example 1 were used to prepare the non-aqueous electrolyte and the button battery, the difference being that: in step (1), 1.0% by weight of compound II was used to prepare the non-aqueous electrolyte C2 and the button battery of the lithium ion battery. battery S2.

Embodiment 3

[0073] The same steps as in Example 1 were used to prepare the non-aqueous electrolyte and the button battery, the difference being that in step (1), 0.5% by weight of compound III was used to replace the added compound II to prepare a non-aqueous electrolytic lithium-ion battery. liquid C3 and button cell S3, wherein compound III is

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PUM

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Abstract

The invention provides a cyclic phosphamido lithium salt, and the structural formula is as shown in formula I in the specification, wherein R1-R8 are independently selected from one of a hydrogen atom, a halogen atom, an alkyl group, a halogenated alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group, an electron withdrawing group and a heteroatom-containing heterocyclic group. The invention also provides an electrolyte additive, an electrolyte, a preparation method of the cyclic phosphamido lithium salt and a battery. The cyclic phosphamido lithium salt provided by the invention has relatively high stability when being applied to an electrolyte, and an SEI film formed in a charge-discharge cycle process is more beneficial to the passing of lithium ions, so that the electrical property of a battery can be improved.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a cyclic phosphoramidite lithium salt and a preparation method thereof, an electrolyte additive, an electrolyte and a battery. Background technique [0002] With the rapid development of the economic level, people are paying more and more attention to the environmental problems that may be brought about by the improvement of the economic level. In the past two or three centuries, fossil energy has pushed the entire human society forward rapidly, but the ensuing environmental problems have always surrounded human society, and there is a growing trend. Therefore, it is an urgent need to find new sustainable green energy. In recent years, secondary batteries represented by lithium-ion batteries have attracted more and more attention due to their substitution of fossil energy and their advantages of green cycle and sustainability. Among them, lithium-ion batteries are particularly attracti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/058H01M10/0525H01M10/42C07F9/6571
CPCH01M10/0567H01M10/058H01M10/0525H01M10/4235C07F9/657154Y02P70/50Y02E60/10
Inventor 鲁平乔飞燕郝嵘潘仪
Owner BYD CO LTD
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