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Electrolyte solution, calcium ion secondary battery and preparation method thereof

A secondary battery, electrolyte technology, applied in secondary batteries, electrolytes, circuits, etc., can solve the problems of restricting the development and application of calcium ion secondary batteries, poor ionic conductivity, serious self-discharge phenomenon, etc., to reduce solvation. effect, low cost, simple material effect

Active Publication Date: 2021-07-20
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor ionic conductivity of calcium ions in non-aqueous electrolytes, strong solvation effects, and serious self-discharge phenomena, the development and application of calcium ion secondary batteries are restricted to a certain extent.

Method used

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  • Electrolyte solution, calcium ion secondary battery and preparation method thereof
  • Electrolyte solution, calcium ion secondary battery and preparation method thereof
  • Electrolyte solution, calcium ion secondary battery and preparation method thereof

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Embodiment approach

[0054] As an optional embodiment of the present invention, the calcium salt includes calcium hexafluorophosphate, calcium tetrafluoroborate, calcium chloride, calcium carbonate, calcium sulfate, calcium nitrate, calcium fluoride, calcium trifluoromethanesulfonate, bis( Any one or a combination of at least two of calcium trifluoromethylsulfonyl)imide, calcium bisfluorosulfonyl imide, or calcium perchlorate, preferably calcium hexafluorophosphate and / or calcium tetrafluoroborate.

[0055] As an optional embodiment of the present invention, the lithium salt includes any one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium bis(trifluoromethylsulfonyl)imide, lithium perchlorate or lithium trifluoromethanesulfonate Or a combination of at least two, preferably lithium hexafluorophosphate and / or lithium tetrafluoroborate;

[0056] And / or, the sodium salt includes any one or a combination of at least two of sodium hexafluorophosphate, sodium perchlorate, sodium nitrat...

Embodiment 1

[0105] This embodiment is a calcium ion secondary battery, including a negative electrode, a separator, an electrolyte and a positive electrode.

[0106] Wherein, the electrolytic solution includes calcium salt and lithium salt, the calcium salt is calcium hexafluorophosphate, and the lithium salt is lithium hexafluorophosphate.

[0107] The specific material composition and preparation method of the calcium ion secondary battery provided in this embodiment are as follows:

[0108] (a) Preparation of positive electrode: Add 0.8g expanded graphite, 0.1g conductive carbon black, and 0.1g polyvinylidene fluoride to 2mL nitrogen methyl pyrrolidone solution, grind thoroughly to obtain a uniform slurry; then evenly coat the slurry on aluminum foil The surface (i.e. the positive electrode current collector) is vacuum-dried, and the dried electrode sheet is cut into a disc with a diameter of 10mm, and it is used as the positive electrode after compaction (10MPa, 10s);

[0109] (b) Pr...

Embodiment 2

[0114] This embodiment provides a calcium ion secondary battery. The mass of calcium hexafluorophosphate in the electrolyte is adjusted to 0.66 g, and the rest of the composition and preparation method are the same as those in Embodiment 1.

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Abstract

The invention provides an electrolyte solution, a calcium ion secondary battery and a preparation method thereof, and relates to the field of batteries. The electrolytic solution includes an electrolyte and a non-aqueous solvent, wherein the electrolyte includes a calcium salt and a non-calcium salt, and the non-calcium salt includes any one or a combination of at least two of lithium salts, sodium salts, or potassium salts, through the calcium salt and the non-calcium salt The hybridization of two or more different cations corresponding to the calcium salt makes the electrolyte have higher ionic conductivity, which can weaken the solvation effect. It is applied to the calcium ion secondary battery, which can reduce the self-discharge phenomenon of the battery, and at the same time It is beneficial to form a good solid electrolyte interface film and improve the energy density and cycle performance of the battery. The present invention also provides a calcium-ion secondary battery, which includes the above electrolytic solution. In view of the advantages of the electrolytic solution, the calcium-ion secondary battery has relatively excellent energy density and cycle performance. The present invention also provides a preparation method of the calcium ion secondary battery, which is simple and stable.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an electrolyte, a calcium ion secondary battery and a preparation method thereof. Background technique [0002] Lithium-ion battery is a relatively common energy storage unit. Although it has been widely used in various fields, its product development is not very mature, and there are still some defects that are not easy to overcome. For example, lithium-ion batteries that usually use carbon materials or metal lithium as the negative electrode and lithium iron phosphate as the positive electrode have poor cycle stability and are likely to pollute the environment; and due to the limited and highly active lithium reserves on the earth, existing lithium-ion The price of batteries remains high, and there are certain safety hazards. Therefore, developing a new type of energy storage device with high energy density, low manufacturing cost, safety and high efficiency is the current r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/054
CPCH01M10/054H01M10/0567H01M2300/0037H01M2300/0091Y02E60/10
Inventor 唐永炳常兴奇周小龙
Owner SHENZHEN INST OF ADVANCED TECH
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