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Electrolyte solution, calcium ion secondary battery and preparation method of calcium ion secondary battery

A secondary battery and electrolyte technology, applied in the direction of secondary batteries, electrolytes, circuits, etc., can solve the problems that restrict the development and application of calcium ion secondary batteries, serious self-discharge phenomenon, poor ion conductivity, etc., to reduce solvation effect, increase the speed of dealloying, and the effect of low cost

Active Publication Date: 2020-06-23
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 of calcium ion secondary battery
  • Electrolyte solution, calcium ion secondary battery and preparation method of calcium ion secondary battery
  • Electrolyte solution, calcium ion secondary battery and preparation method of calcium ion secondary battery

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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 of the calcium ion secondary battery, and relates to the field of batteries. The electrolyte solution comprises an electrolyte and a non-aqueous solvent, wherein the electrolyte comprises calcium salt and non-calcium salt; the non-calcium salt comprises any one or a combination of at least twoof lithium salt, sodium salt and potassium salt; more than two different cations corresponding to calcium salt and non-calcium salt are hybridized to enable the electrolyte solution to have high ionicconductivity, the solvation effect can be weakened, the self-discharge phenomenon of the battery can be reduced when the electrolyte solution is applied to the calcium ion secondary battery, a good solid electrolyte interface film is facilitated to be formed at the same time, and the energy density and the cycle performance of the battery can be improved. The invention further provides a calciumion secondary battery comprising the electrolyte solution. In view of the advantages of the electrolyte solution, the calcium ion secondary battery has excellent energy density and cycle performance.The invention also provides a preparation method of the calcium ion secondary battery. The preparation method 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 Applications(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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