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Preparation method and application of inorganic colloidal electrolyte of aqueous zinc ion battery

A technology of zinc-ion batteries and inorganic colloids, applied in the direction of electrolyte immobilization/gelation, secondary batteries, circuits, etc., can solve problems such as reducing ion conductivity and battery life, not suitable for practical applications, and polymer structure reorganization , to achieve good biocompatibility and thermal stability, easy to implement, and increase the diffusion rate

Pending Publication Date: 2020-08-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as "water in salt" electrolyte, a high-concentration electrolyte solution can effectively inhibit the interaction between zinc ions and water molecules and avoid side reactions, but the use of a large amount of zinc salt also increases the cost and is not suitable for practical application
However, colloidal electrolytes have potential development prospects due to their limited active water and good ionic conductivity. At the same time, they can effectively solve the problem of electrolyte leakage after battery damage. Prepared by plasticization, but the polymer is prone to structural reorganization and highly crystalline, which reduces ionic conductivity and battery life

Method used

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  • Preparation method and application of inorganic colloidal electrolyte of aqueous zinc ion battery
  • Preparation method and application of inorganic colloidal electrolyte of aqueous zinc ion battery
  • Preparation method and application of inorganic colloidal electrolyte of aqueous zinc ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Solution configuration: ① Dissolve zinc sulfate in deionized solution to prepare 2mol / L zinc sulfate; ② Dissolve zinc sulfate and manganese sulfate in deionized water to prepare 2mol / L zinc sulfate + 0.1mol / L manganese sulfate liquid electrolyte.

[0037]Add calcium hydroxyphosphate into 2mol / L zinc sulfate solution at a mass ratio of 3:10. After mixing, let it stand for 12 hours to allow sufficient calcium-zinc ion exchange reaction to occur, and then carry out suction filtration. Drying for 12 hours under the hood to obtain inorganic powder;

[0038] Grind the inorganic powder into a fine powder in a mortar, add it into the liquid electrolyte according to the fact that the inorganic powder accounts for 60% of the mass of the electrolyte, mix evenly, and press it into a sheet with a thickness of 0.5 mm to obtain the inorganic colloidal electrolyte.

[0039] The inorganic powder and calcium hydroxyphosphate prepared in this example were characterized by an X-ray diffra...

Embodiment 2

[0044] The colloidal electrolyte preparation method of this embodiment is basically the same as that of Example 1, but the thickness of the colloidal electrolyte used to assemble the zinc-ion battery is 0.8mm, and the CR2016 button battery is assembled together with the manganese dioxide positive electrode and the zinc sheet negative electrode, at 0.5A g -1 Under the current density of 0.85 ~ 1.8V voltage range, use the LAND test system to measure its electrochemical performance, get Figure 6 The cycle performance diagram and partial charge-discharge curve diagram.

[0045] Figure 6 a is the cycle performance diagram of the zinc-ion battery assembled by the colloidal electrolyte of this embodiment, and the initial specific volume is 163mA h g -1 , the specific capacity after 100 cycles is 164mA h g -1 , the curve is basically level, compared with Example 1, it shows that increasing the thickness of the colloidal electrolyte can effectively improve the cycle stability of th...

Embodiment 3

[0047] Solution configuration: ① Dissolve zinc sulfate in deionized solution to prepare 2mol / L zinc sulfate; ② Dissolve zinc sulfate and manganese sulfate in deionized water to prepare 2mol / L zinc sulfate + 0.1mol / L manganese sulfate liquid electrolyte.

[0048] Add calcium hydroxyphosphate into 2mol / L zinc sulfate solution at a mass ratio of 3:10. After mixing, ultrasonically treat for 2 hours to allow sufficient calcium-zinc ion exchange reaction to occur, and then carry out suction filtration. Drying for 12 hours under the hood to obtain inorganic powder;

[0049] Grind the inorganic powder into a fine powder in a mortar, add it into the liquid electrolyte according to the fact that the inorganic powder accounts for 60% of the mass of the electrolyte, mix evenly, and press it into a sheet with a thickness of 0.5 mm to obtain the inorganic colloidal electrolyte.

[0050] Using the colloidal electrolyte prepared in this example, the positive electrode of manganese dioxide, a...

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Abstract

The invention discloses a preparation method and application of an inorganic colloidal electrolyte of an aqueous zinc ion battery. The method comprises the following steps of 1) immersing hydroxyl calcium phosphate into a zinc salt solution, carrying out ion exchange treatment, filtering and drying to obtain inorganic powder after the treatment is finished, and 2) grinding the inorganic powder, mixing the ground inorganic powder with a conventional liquid electrolyte, uniformly mixing, and pressing into a sheet with a set thickness to obtain the inorganic colloidal electrolyte. Calcium ions and zinc ions in hydroxyl calcium phosphate are subjected to ion exchange to obtain inorganic matter in a mixed form of hydroxyl zinc phosphate and hydroxyl calcium phosphate; the colloidal electrolytecan be obtained only by mixing with a small amount of conventional liquid electrolyte and then pressing; a role of positive and negative electrode isolation is plated; the active water amount is reduced; alleviation of the water decomposition side reaction is carried out; the capacity attenuation is avoided; the high specific capacity and the high cycle stability are ensured; the preparation process is simple, safe and nontoxic; and application prospect in the field of development of high-stability colloidal zinc ion batteries.= is achieved.

Description

technical field [0001] The invention belongs to the technical field of preparation of colloidal electrolytes for water-based zinc-ion batteries, and in particular relates to a preparation method and application of inorganic colloidal electrolytes for water-based zinc-ion batteries. Background technique [0002] In recent years, due to the high theoretical capacity of metal zinc (820mA·h·g -1 ), rich in reserves, safe, green and non-toxic, and other outstanding advantages, it has attracted widespread attention and has potential application value in the field of large-scale energy storage. Electrolyte is one of the important components in the composition of batteries. Nowadays, the electrolytes of zinc-ion batteries are mostly water-based liquid electrolytes. A large amount of active water will cause many side reactions, such as hydrogen evolution, corrosion, passivation, etc., and further lead to the occurrence of zinc-ion batteries. Capacity fading, low Coulombic efficiency...

Claims

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Application Information

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IPC IPC(8): H01M10/38
CPCH01M10/38H01M2300/0085Y02E60/10Y02P70/50
Inventor 梁叔全解雪松邢振月周江
Owner CENT SOUTH UNIV
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