High-rate long-service-life aqueous zinc-based battery based on double-electron reaction

A zinc-based battery, high-rate technology, applied in battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve the problems of manganese dioxide structure collapse, reaction limitations, etc. The effect of specific capacity improvement and high rate performance

Inactive Publication Date: 2021-04-02
浙江浙能中科储能科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the deepening of the research, the performance improvement of the material has reached a bottleneck only through the means of material modification, the reaction is limited to the single-electron reaction process, and with the charging and discharging, manganese dioxide is prone to structural collapse, so the battery The cycle life of the battery is facing severe challenges, so the design of a new system is required to further improve the electrochemical performance of the battery

Method used

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  • High-rate long-service-life aqueous zinc-based battery based on double-electron reaction
  • High-rate long-service-life aqueous zinc-based battery based on double-electron reaction
  • High-rate long-service-life aqueous zinc-based battery based on double-electron reaction

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Effect test

Embodiment 1

[0028] An aqueous zinc-based secondary battery based on a two-electron reaction, the negative electrode is zinc foil, and the positive electrode is graphite felt containing electrodeposited manganese (IV) oxide.

[0029] The organic carboxylic acid zinc salt / manganese salt electrolyte contains 1 mol / L zinc acetate and 0.5 mol / L manganese acetate. 1.8V constant voltage charging to 0.5mAh / cm 2 , followed by 5mA / cm 2 Constant current discharge to 1V under current density. The battery test results are attached figure 1 As shown, the Coulombic efficiency of the first cycle is 68.35%, but after 100 cycles, the Coulombic efficiency is stable at 88.37%, indicating that the two-electron reaction aqueous zinc-based secondary battery has good reversibility and cycle stability.

Embodiment 2

[0031] An aqueous zinc-based secondary battery based on a two-electron reaction, the negative electrode current collector is zinc foil, and the positive electrode is graphite felt containing electrodeposited manganese (IV) oxide.

[0032] The organic carboxylic acid zinc salt / manganese salt electrolyte contains 1 mol / L zinc acetate, 0.5 mol / L manganese acetate, and 0.3 mol / L acetic acid. 1.8V constant voltage charging to 0.5mAh / cm 2 , then at 5mA / cm 2 Constant current discharge to 1V under current density. The battery test results are attached figure 2 As shown, the Coulombic efficiency in the first cycle is 95.28%, and the Coulombic efficiency stabilizes at 97.04% after 100 cycles. Therefore, the introduction of organic carboxylic acid into the electrolyte can improve the Coulombic efficiency and cycle life of the two-electron reaction aqueous zinc-based secondary battery.

Embodiment 3

[0034] An aqueous zinc-based secondary battery based on a two-electron reaction, the negative electrode current collector is zinc foil, and the positive electrode is graphite felt containing electrodeposited manganese (IV) oxide.

[0035] The electrolyte solution contains 1 mol / L zinc acetate, 0.5 mol / L manganese acetate, and 0.5 mol / L acetic acid. 1.8V constant voltage charging to 0.5mAh / cm 2 , then at 5mA / cm 2 Constant current discharge to 1V under current density. The battery test results are attached image 3 As shown, the Coulombic efficiency of the first cycle is 98.15%, and the Coulombic efficiency is stable at 97.99% after 100 cycles. Therefore, increasing the concentration of organic carboxylic acid can improve the coulombic efficiency and cycle life of the two-electron reaction aqueous zinc-based secondary battery.

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Abstract

The invention relates to a high-rate long-service-life aqueous zinc-based battery based on a double-electron reaction. According to the invention, an aqueous electrolyte of the battery is an electrolyte with organic carboxylic zinc/manganese salt as solute and also comprises a halogen-based ion enhanced additive; a positive electrode is manganese oxide, and a negative electrode is metal zinc or zinc alloy. During discharging, the manganese oxide of the positive electrode obtains electrons, is reduced into manganese ions and is dissolved in the electrolyte; and meanwhile, the zinc/zinc alloy ofthe negative electrode gives out electrons to generate zinc ions into the solution. During charging, manganese ions in a positive electrode region lose electrons, are oxidized into manganese oxide and are deposited on a positive electrode current collector, and zinc ions at the negative electrode obtain electrons and are reduced into metal zinc/zinc alloy. The charging and discharging processes are alternately carried out. The weakly-acidic reaction system of the aqueous zinc-based battery provided by the invention has the beneficial effects that the weakly-acidic reaction system utilizes thedouble-electron transfer reaction of manganese oxide, and compared with a traditional single-electron transfer reaction, specific capacity is doubled, and higher energy density is obtained.

Description

technical field [0001] The invention relates to the field of zinc batteries, in particular to a high-rate and long-life aqueous zinc-based battery based on a double-electron reaction. Background technique [0002] In the context of increasingly serious environmental pollution and energy crisis, it is very important to explore clean and renewable energy storage technologies for the sustainable development of human society. Among various energy storage technologies, commercialized organic lithium-ion batteries have limited their large-scale application due to high cost, flammability and explosive problems. Aqueous zinc-based batteries based on neutral aqueous electrolytes use metal zinc anodes, which have the advantages of low cost and high capacity. At the same time, aqueous electrolytes have good safety performance. Therefore, aqueous zinc-based batteries have good applications in the field of large-scale energy storage. prospect. In particular, aqueous zinc-manganese batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/38H01M4/50H01M10/42
CPCH01M4/50H01M10/38H01M10/4235H01M2300/0005Y02E60/10Y02P70/50
Inventor 迟晓伟武静王玉弘张婧李卓斌沈建明
Owner 浙江浙能中科储能科技有限公司
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