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A kind of sodium magnesium secondary battery and preparation method thereof

A magnesium secondary battery and electrolyte technology, applied in the field of sodium magnesium secondary battery and its preparation, can solve the problems of slow magnesium ion intercalation process, large polarization, poor rate cycle performance, etc.

Active Publication Date: 2018-10-19
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of suitable cathode materials and electrolyte systems, and the strong Coulomb interaction between magnesium ions and other ions, the intercalation process of magnesium ions is slow, resulting in large polarization and rapid capacity decay during charge and discharge. The problem of poor rate cycle performance restricts the development of magnesium-ion batteries

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  • A kind of sodium magnesium secondary battery and preparation method thereof
  • A kind of sodium magnesium secondary battery and preparation method thereof
  • A kind of sodium magnesium secondary battery and preparation method thereof

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preparation example Construction

[0039] In the present invention, the preparation method of the positive electrode preferably includes the following steps: (a) adding TiS 2 , conductive aid and binding agent are mixed to obtain mixed slurry; (b) coating the mixed slurry obtained in the step (a) on a substrate to obtain a primary positive electrode; (c) drying the primary positive electrode After pressing, the positive electrode is obtained.

[0040] The present invention preferably uses TiS 2 , the conductive auxiliary agent and the binder are mixed to obtain a mixed slurry. In the present invention, the amount and type of raw materials in the mixed slurry are in accordance with the TiS mentioned in the above technical scheme 2 , conductive additives and binders. The present invention has no special requirements on the mixing method, and a mixing method well known to those skilled in the art can be used. The present invention preferably adopts the mode of manual agitation to mix described TiS 2 , conduct...

Embodiment 1

[0052] Preparation of electrolyte solution: put 1mol of sodium borohydride and 0.1mol of magnesium borohydride into a conical flask in the glove box, and add diethylene glycol dimethyl ether, under the action of a magnetic stirrer at 500r / min Stirring at high speed for 12 hours to obtain an electrolyte, the concentration of sodium borohydride in the obtained electrolyte is 1 mol / L, and the concentration of magnesium borohydride is 0.1 mol / L.

[0053] Preparation of positive electrode material: according to the mass ratio of 75:10:7 commercial TiS 2 , acetylene black and polyvinylidene fluoride are mixed in an agate mortar by manual stirring to obtain a mixed slurry, wherein the stirring rate is 100r / min, and the stirring time is 5min; the obtained mixed slurry is coated with On a 9μm stainless steel substrate, the amount of mixed slurry coating is based on the area of ​​the substrate as 3mg / cm 2 Then, the stainless steel substrate coated with the mixed slurry was dried for 10...

Embodiment 2

[0057] Prepare the electrolyte: put 0.5mol of sodium borohydride and 0.1mol of magnesium borohydride into the conical flask in the glove box, and add diethylene glycol dimethyl ether, under the action of a magnetic stirrer at 150r / min Stir at a high speed for 24 hours to obtain an electrolytic solution, the concentration of sodium borohydride in the obtained electrolytic solution is 0.5 mol / L, and the concentration of magnesium borohydride is 0.1 mol / L.

[0058] Preparation of positive electrode material: according to the mass ratio of 70:20:10 commercial TiS 2 , natural graphite and polyacrylic acid are mixed in an agate mortar by manual stirring to obtain a mixed slurry, wherein the stirring rate is 300r / min, and the stirring time is 5min; the obtained mixed slurry is coated with 10μm graphite On the foil substrate, the amount of mixed slurry coating is based on the area of ​​the substrate as 3mg / cm 2 Then, the graphite foil substrate coated with the mixed slurry was dried ...

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Abstract

The invention provides a sodium-magnesium secondary battery, comprising a positive electrode, a negative electrode and an electrolyte, the positive electrode includes TiS2, the negative electrode is metal magnesium, and the electrolyte is an organic solution system including sodium-magnesium ions. In the present invention, the negative electrode only has metal magnesium, and during the charging and discharging process, there is only the precipitation and dissolution of metal magnesium, which solves the problem that metal lithium is not easily inserted and removed, resulting in poor cycle performance; the organic solution system including sodium magnesium ions is used. As an electrolyte for secondary batteries, it can improve the defects of low capacity, poor reversibility, and poor rate performance and rapid capacity decay caused by the polarization of magnesium ions for electrolytes containing only magnesium ions. The electrolyte of the secondary battery avoids the generation of dendrites caused by the direct use of metal ions, and improves the safety; metal lithium is not used in the electrolyte and electrode materials, which effectively reduces the cost of the battery.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, in particular to a sodium-magnesium secondary battery and a preparation method thereof. Background technique [0002] Batteries are more and more widely used in modern society. Secondary batteries with high energy density, large capacity, high working voltage, low cost and environmental friendliness are the development direction of energy storage battery technology in the future. Lithium-ion batteries are favored by people because of their high energy density, long cycle life, high operating voltage, and wide operating temperature range. [0003] However, lithium metal is extremely active in the air, so it can be used in small-capacity secondary batteries, but it will inevitably cause safety problems when used in large-capacity storage. At the same time, the content of lithium element in nature is limited, and the price is relatively high. Studies have shown that rechargeable magnes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/054H01M10/058
CPCH01M10/054H01M10/058Y02E60/10Y02P70/50
Inventor 魏英进赵赢营边筱扉陈楠杜菲陈岗
Owner JILIN UNIV
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