Positive active material for aqueous zinc ion secondary battery and aqueous zinc ion secondary battery

A cathode active material, zinc ion battery technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of high charge density, low activity, difficulty in de-intercalation and migration, and achieve the effect of high working voltage

Active Publication Date: 2018-11-23
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its low activity and high charge density,

Method used

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  • Positive active material for aqueous zinc ion secondary battery and aqueous zinc ion secondary battery
  • Positive active material for aqueous zinc ion secondary battery and aqueous zinc ion secondary battery
  • Positive active material for aqueous zinc ion secondary battery and aqueous zinc ion secondary battery

Examples

Experimental program
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Example Embodiment

[0042] The preparation method of the lithium vanadyl phosphate is as follows:

[0043] Mix citric acid, vanadium source compound and water for reaction;

[0044] Add an ammonium salt compound and a lithium salt compound to the above reaction product, mix, and evaporate to remove water to obtain a gel;

[0045] The gel is calcined at high temperature to obtain LiVOPO 4 ;

[0046] Specifically, the vanadium source compound is selected from vanadium pentoxide, and the molar ratio of the citric acid to the vanadium source compound is (2-8):1.

[0047] After the vanadium pentoxide is completely dissolved, add the ammonium phosphate compound and the lithium salt compound to the above solution, mix, and evaporate to remove water to obtain a gel;

[0048] Wherein, the ammonium phosphate compound is selected from ammonium dihydrogen phosphate; the lithium salt compound is selected from lithium nitrate;

[0049] The evaporation temperature is 100°C to 120°C, preferably 105 to 115°C;

[0050] Then, a...

Example Embodiment

[0085] Example 1

[0086] Accurately weigh 0.01mol vanadium pentoxide and 0.04mol citric acid, pour them into a beaker filled with distilled water, heat to 60°C and stir continuously until they become a dark blue solution. Then slowly add 0.02mol dihydrogen ammonium phosphate and 0.02mol lithium nitrate respectively, and raise the temperature to 100~120℃, evaporate and remove the water until a gel is formed; then place the obtained gel at 120℃ for air drying The precursor can be obtained in the box. Finally, after high temperature calcination at 500℃, LiVOPO is obtained 4 .

[0087] LiVOPO that can deintercalate divalent zinc ions was prepared by sol-gel method. 4 The cathode material, its XRD diffraction pattern is as figure 1 Shown. by figure 2 It can be seen that it consists of rod-shaped lithium vanadyl phosphate particles of different sizes and irregular cross-sections formed by interlacing porous layers. The material with this shape facilitates the immersion of the electr...

Example Embodiment

[0102] Example 2

[0103] This embodiment is basically the same as embodiment 1, except that the electrolyte is zinc perchlorate with a molar concentration of 7 mol / L. The method of embodiment 1 is used to construct an aqueous zinc ion battery. The assembled water-based zinc ion secondary battery was subjected to a charge and discharge test at a constant current. However, the discharge capacity of this battery is lower than that of Example 1, after being subjected to different rate cycle charge and discharge tests, which is about 120mAh g at 0.2C. -1 , It also showed a poor coulombic efficiency, less than 95%. It shows that in this example, the addition of a large amount of polyethylene glycol (the increase in concentration only reduces the water content, but the ratio of zinc perchlorate and polyethylene glycol remains unchanged) although it is beneficial to increase the voltage window of the zinc ion electrolyte And promote the stability of the material, but it greatly reduces...

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Abstract

The invention provides a positive active material for an aqueous zinc ion secondary battery. The positive active material comprises lithium vanadium phosphate. The lithium vanadium phosphate LiVOPO4 is used as the positive active material of the aqueous zinc ion battery. The positive active material is beneficial for de-intercalation of divalent zinc ions, and the built aqueous zinc ion secondarybattery has a relatively high working voltage.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a positive electrode active material for a water system zinc ion secondary battery and a water system zinc ion secondary battery. Background technique [0002] As a device for electrochemically storing energy, secondary batteries are more economical and practical in real life because they can be repeatedly charged and discharged, have high energy density, and have no memory effect. Compared with organic ion secondary batteries, the electrolyte of aqueous ion batteries uses water as a solvent, which can not only avoid strict battery assembly conditions, but also facilitate the reduction of production costs; and the ionic conductivity is two orders of magnitude higher than that of organic electrolytes, which is conducive to Realize the fast charging and discharging of the battery. Plus, it's greener and safer. Therefore, aqueous ion batteries have the advantages of ...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/36
CPCH01M4/5825H01M10/36Y02E60/10
Inventor 牛磊陈亮王武练刘兆平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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