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Preparation method of zinc-nickel battery negative electrode silicate crystal material

A crystal material, zinc-nickel battery technology, applied in nickel storage batteries, battery electrodes, alkaline storage batteries, etc., can solve the problems of zinc anode material expansion and dendrite growth, etc., to achieve the effect of simple process, low cost and reduced possibility

Active Publication Date: 2020-03-27
河南创力新能源科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current method cannot solve the problems of expansion and shedding and dendrite growth of zinc anode materials in zinc-nickel batteries.

Method used

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  • Preparation method of zinc-nickel battery negative electrode silicate crystal material
  • Preparation method of zinc-nickel battery negative electrode silicate crystal material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Add zinc chloride, stannous chloride, and calcium chloride into deionized water at 60°C according to the molar ratio of elements Zn:Sn:Ca=1.5:0.25:0.25 and stir until dissolved, then add 1M Na 2 SiO 3 Aqueous solution and keep the pH value of the mixed system at 9, after fully reacting for 2 hours, naturally cool and age for 6 hours to room temperature, filter, wash, dry and pulverize the precipitate at a temperature of 100°C to obtain the precursor of the target product.

Embodiment 2

[0015] Add zinc sulfate, stannous sulfate and calcium nitrate into deionized water at 60°C according to the ratio of element molar ratio Zn:Sn:Ca=1:0.5:0.5 and stir until dissolved, then add 1M Na 2 SiO 3 Aqueous solution and keep the pH value of the mixed system at 9, after fully reacting for 2 hours, naturally cool and age for 6 hours to room temperature, filter, wash, dry and pulverize the precipitate at a temperature of 100°C to obtain the precursor of the target product.

Embodiment 3

[0017] The silicate precursor crystal material obtained in Example 1 was placed in a muffle furnace for sintering at 850°C for 2 hours, and then cooled to room temperature with the furnace to obtain the target product silicate crystal material ZnCa 0.25 sn 0.25 SiO 4 , the sintered material is crushed and sieved for use.

[0018] The ZnCa 0.25 sn 0.25 SiO 4 Add 5wt% conductive graphite to the silicate crystal material, use HPMC and SBR binder to prepare a slurry with a viscosity of about 10000cP and coat it on a density of 350g / m 2 On the nickel foam substrate, after drying and rolling, the tabs are spot-welded to form a negative electrode, and a negative electrode is sandwiched between two nickel hydroxide positive electrodes, and the positive and negative electrodes are separated by a diaphragm. In 7M KOH solution , after 300 charge-discharge cycles at a current of 0.2C, the measured capacity is 230mAh / g.

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PUM

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Abstract

The invention discloses a preparation method of a zinc-nickel battery negative electrode silicate crystal material. The preparation method comprises the following steps: dispersing and dissolving soluble zinc salt, soluble tin salt and soluble calcium salt in deionized water in proportion, adding a sodium silicate solution, keeping the pH value at 9-10, carrying out a coprecipitation reaction, andfiltering and drying the product to obtain a precursor of the silicate crystal material; and sintering the prepared precursor at the temperature of 700-1050 DEG C for 1-10 hours to obtain the targetproduct silicate crystal material. The crystalline material with higher crystallinity and good expansion resistance can be used as a battery negative electrode active substance or a negative electrodeadditive.

Description

technical field [0001] The invention belongs to the technical field of alkaline secondary battery negative electrode materials, and in particular relates to a preparation method of a negative electrode silicate crystal material of a zinc-nickel battery. Background technique [0002] The currently available square secondary batteries are mainly lead-acid batteries, nickel-hydrogen batteries and lithium-ion batteries. Among them, the specific energy of lead-acid batteries is low, generally only reaching 30~35Wh / Kg, and the cycle life is about 300~350 times. It needs a long charging time, and lead is a toxic heavy metal. If it is not handled properly during the production process and recycling, it will cause serious pollution to the environment, and its production and use have been restricted by countries all over the world. Nickel-hydrogen batteries have a low working voltage and high self-discharge at high temperatures. They need to use a large amount of rare earth raw materi...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/30
CPCH01M4/5825H01M10/30Y02E60/10
Inventor 杨玉锋徐平李群杰李喜歌王晓燕明兰彭英长
Owner 河南创力新能源科技股份有限公司
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