Electrolyte of water system lithium zinc battery

An electrolyte and lithium-zinc technology, which is applied in the field of electrochemical energy storage, can solve problems such as dendrites, and achieve the effect of avoiding zinc dendrites, avoiding the generation of zinc dendrites, and uniform and smooth zinc deposition

Inactive Publication Date: 2012-11-07
刘昊
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defect that the above-mentioned water-based lithium-zinc battery is prone to dendrites during use, and to provide an electrolyte suitable for rechargeable water-based lithium-zinc batteries, which enables the water-based lithium-zinc battery to be charged for a long time. Uniform and smooth zinc deposition effect and good reversibility can still be obtained during the discharge process, effectively avoiding the generation of zinc dendrites, and greatly reducing the probability of battery short circuit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Spinel LiMn 2 o 4 It is the positive electrode active material, the superconducting carbon black is the conductive agent, and the polymer homopolymer PVDF is used as the binder. It is uniformly mixed according to the ratio of 92:4:4, and dispersed in the NMP solution to make a slurry. The mass ratio of solid to liquid is 1:1, and then the prepared slurry is coated on the above-mentioned surface-treated graphite foil with a coating thickness of 50 μm, dried and cut into the required size as the positive electrode sheet. The negative pole is copper foil. The diaphragm is an AGM glass fiber diaphragm. The electrolyte is a mixed aqueous solution of lithium chloride and zinc chloride containing 2mol / L lithium ions and 2mol / L zinc ions, and 4-phenyl-3-buten-2-one is dissolved in the electrolyte as a galvanizing additive. The concentration is 0.05g / L.

[0016] Assemble the above-mentioned positive electrode, negative electrode, and diaphragm into a battery and add elec...

Embodiment 2

[0019] The manufacturing and testing methods of the battery are the same as in Example 1, and the galvanizing additive in the electrolyte is 4-phenyl-3-buten-2-one with a concentration of 1 g / L.

[0020]

Embodiment 3

[0022] The manufacturing and testing methods of the battery are the same as in Example 1, and the galvanizing additive in the electrolyte is 4-phenyl-3-buten-2-one with a concentration of 5 g / L.

[0023]

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PUM

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Abstract

The invention discloses electrolyte of a chargeable water system lithium zinc battery. The existing water system lithium zinc battery is apt to occur zinc deposition of dendritic crystals in a charging and discharging process for a long period along reversible redox reaction of zinc on one side of a negative electrode so as to cause piercing of a membrane and efficacy losing caused by battery short circuit. The electrolyte comprises water, electrolyte salt and zinc-plating additive. The electrolyte salt is zinc salt and lithium salt which are soluble in water, and concentration of lithium ion and concentration of zinc ion in the electrolyte are both 0.5-5mol/L. The electrolyte enables the water system lithium zinc battery to obtain even and smooth zinc deposition effects, is good in reversibility, effectively avoids production of the dendritic crystals, and greatly reduces probability of battery short circuit.

Description

[0001] technical field [0002] The invention relates to the field of electrochemical energy storage, in particular to an electrolyte solution for a rechargeable aqueous lithium-zinc battery. Background technique [0003] As a century-old mature battery technology, lead-acid batteries occupy an absolute market share in energy storage fields such as car starter batteries, electric bicycles, and UPS. In 2010, the global annual sales reached 35 billion US dollars. Although the cycle life of the lead-acid battery is not long (about 300 times) and the energy density is not high (30~45Wh / kg), its price is low and the cost performance is very high. Therefore, many new secondary batteries such as nickel-metal hydride batteries, lithium-ion batteries, vanadium redox flow batteries, flywheel batteries, and sodium-sulfur batteries that have emerged in the past two decades cannot replace lead-acid batteries in the field of energy storage. [0004] The recent emergence of a new type o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36
CPCY02E60/12Y02E60/10
Inventor 刘昊
Owner 刘昊
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