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Preparation method of high-energy-density and high-voltage graphite-zinc-based ion battery based on aqueous electrolyte

A high energy density, water-based electrolyte technology, applied in the field of preparation of water-based electrolyte graphite-zinc-based ion batteries, can solve the problems of narrow voltage window, low voltage, low energy density, etc., and achieve the effect of low price

Active Publication Date: 2020-06-05
NANKAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing an aqueous electrolyte graphite-zinc ion battery capable of achieving high voltage and high energy density, aiming at the problem of low energy density caused by the low working voltage and narrow voltage window of the current aqueous zinc-based ion

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  • Preparation method of high-energy-density and high-voltage graphite-zinc-based ion battery based on aqueous electrolyte
  • Preparation method of high-energy-density and high-voltage graphite-zinc-based ion battery based on aqueous electrolyte
  • Preparation method of high-energy-density and high-voltage graphite-zinc-based ion battery based on aqueous electrolyte

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Embodiment 1

[0029] A method for preparing a high-energy density, high-voltage graphite-zinc-based ion battery based on an aqueous electrolyte, comprising the following steps:

[0030] (1) Synthesis of aqueous electrolyte:

[0031] The configuration concentration is 5.89mol kg -1 (30mol / L) zinc chloride and 0.38mol kg -1 (0.4mol / L) potassium bromide aqueous solution, the molar ratio of zinc chloride and potassium bromide in the aqueous solution is 750:1, as the electrolyte.

[0032] (2) 900 mg of artificial graphite positive electrode material and 3.33 g of 3% sodium carboxymethyl cellulose aqueous solution were fully stirred, then coated with a wet film-making method, and vacuum-dried at 80° C. for 10 hours to obtain a positive electrode sheet. The material characterization of the graphite cathode material used is as follows figure 1 , powder X-ray results show the phase purity of graphite; figure 2 The field emission scanning electron microscope image shows that the morphology of g...

Embodiment 2

[0035] A method for preparing a high-energy density, high-voltage graphite-zinc-based ion battery based on an aqueous electrolyte, comprising the following steps:

[0036] (1) Synthesis of electrolyte:

[0037] Dissolve zinc chloride (81.78g, 0.6mol) and potassium bromide (0.47g, 0.004mol) in water (20mL) to obtain potassium bromide (0.2mol / L) and zinc chloride (30mol / L) the electrolyte;

[0038] Dissolve zinc chloride (81.78g, 0.6mol) and potassium bromide (0.95g, 0.008mol) in water (20mL) to obtain potassium bromide (0.4mol / L) and zinc chloride (30mol / L) the electrolyte;

[0039]Dissolve zinc chloride (81.78g, 0.6mol) and potassium bromide (1.90g, 0.016mol) in water (20mL) to obtain potassium bromide (0.8mol / L) and zinc chloride (30mol / L) the electrolyte;

[0040] Dissolve zinc chloride (81.78g, 0.6mol) and potassium bromide (3.57g, 0.03mol) in water (20mL) to obtain potassium bromide (1.5mol / L) and zinc chloride (30mol / L) of electrolyte.

[0041] (2) 900 mg of artific...

Embodiment 3

[0044] A method for preparing a high-energy density, high-voltage graphite-zinc-based ion battery based on an aqueous electrolyte, comprising the following steps:

[0045] (1) Synthesis of electrolyte:

[0046] Dissolve zinc chloride (81.78g, 0.6mol) and potassium bromide (0.95g, 0.008mol) in water (20mL) to obtain potassium bromide (0.4mol / L) and zinc chloride (30mol / L) of electrolyte.

[0047] (2) 850 mg of artificial graphite positive electrode material, 50 mg of Super P conductive agent, and 3.33 g of 3% sodium carboxymethylcellulose aqueous solution were fully stirred, and then coated with a wet film-making method, and vacuum-dried at 60 ° C for 12 hours to obtain a positive electrode piece. The material characterization of the graphite cathode material used is as follows figure 1 , powder X-ray results show the high purity of graphite; figure 2 The field emission scanning electron microscope image shows that the morphology of graphite is micron-sized particles; i...

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Abstract

A preparation method of the high-energy-density and high-voltage graphite-zinc-based ion battery based on the aqueous electrolyte comprises the following steps: (1) dissolving soluble bromine salt into a saturated zinc chloride solution to obtain a high-concentration (-30mol / L) electrolyte; and (2) coating the graphite positive electrode material with a film by using a wet film preparation methodto prepare the positive electrode plate;(3) assembling the electrolyte, the positive pole piece and the negative pole metal zinc foil into the simple soft package battery. According to the invention,a novel high-concentration zinc chloride + bromine salt aqueous electrolyte is designed as a core, a reversible intercalation reaction can be carried out in a graphite electrode based on the electrolyte, and the high capacity of 257mAh g <-1 > can be obtained under the condition that the average potential is 1.71 V (p-Zn / Zn < 2 + >). The graphite-zinc-based dual-ion battery with the limit voltageof 2V or above is assembled, and the energy density of the battery can reach 440Wh kg <-1 >. The halogen anion intercalation mechanism is combined with the high energy density of the conversion reaction, so that the energy density of the aqueous zinc-based battery is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of secondary ion batteries, and in particular relates to the preparation of an aqueous electrolyte graphite-zinc-based ion battery capable of realizing high voltage and high energy density. Background technique [0002] Since the invention of zinc-manganese batteries in the 1860s, zinc batteries have been widely used in the field of primary batteries. In the 1960s, secondary alkaline zinc-manganese batteries were widely developed, but their cycle life was short due to the irreversible by-products produced during the discharge process. The development of electric vehicles and smart grids, as well as the increasing popularity of intermittent energy sources such as solar energy, wind energy, and tidal energy, urgently require the development of new large-scale energy storage systems. Secondary batteries are one of the important large-scale energy storage systems. An ideal secondary battery for ...

Claims

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Application Information

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IPC IPC(8): H01M10/36H01M10/38
CPCH01M10/36H01M10/38H01M2300/0002Y02E60/10Y02P70/50
Inventor 师唯刘洪文杨皓程鹏
Owner NANKAI UNIV
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