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Mixed water system ionic battery and application thereof

An ion battery, water system technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of short-circuit batteries, low energy density, crystallization, etc., to solve the problem of short cycle life, high cycle stability, and simple manufacturing process Effect

Active Publication Date: 2018-07-24
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mass of the positive electrode active material in this battery system is much larger than that of the negative electrode, and the capacity of the negative electrode active material is only 90mAh / g, so the energy density of the battery system is much lower than that of lead-acid batteries.
At the same time, due to the narrow electrochemical stability window (1.23V) of water, the output voltage and energy density of the aqueous lithium-ion battery are low.
Although Wang Chunsheng et al. (Document 5, L.M.Suo, Oleg Borodin, Tao Gao, Scince. 2015, 350, 938-943) successfully solved this problem by using an ultra-high concentration lithium ion aqueous solution as the electrolyte, the organolithium salt they used was expensive , cannot be applied on a large scale; and the ultra-high concentration lithium ion solution is temperature-dependent, and organic lithium salts will crystallize at temperatures below room temperature, piercing the separator and causing short circuits and battery damage

Method used

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  • Mixed water system ionic battery and application thereof
  • Mixed water system ionic battery and application thereof
  • Mixed water system ionic battery and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] In a beaker, weigh 78g of sodium carbonate, 1000g of tetrabutyl titanate, 508g of phosphoric acid and 50g of acetylene black, and disperse them in 5L of ethanol, ball mill and stir at 50Hz for 1h, and dry at 90°C to obtain the precursor; then dry The precursor was transferred from the beaker to an agate mortar and ground for half an hour, and then the uniformly ground powder sample was transferred to a 10L capacity nitrogen atmosphere reaction furnace, and the temperature in the reaction furnace was raised at a rate of 5°C / min. When the temperature When the temperature is raised to 400°C, the temperature is kept constant for 5 hours, then the temperature is raised to 800°C at 5°C / min, the temperature is kept constant for 10 hours, and finally cooled to room temperature naturally to obtain carbon composite NaTi 2 (PO 4 ) 3 Material.

[0066] Adopt X-ray powder diffractometer to the carbon composite NaTi that present embodiment 1 obtains 2 (PO 4 ) 3 The material was ...

Embodiment 2

[0071] In a beaker, weigh 36g of disodium edetate, 500g of titanium dioxide and 508g of phosphoric acid, and disperse them in 5L of methanol, then add 50g of graphite, stir by ball milling at 50Hz for 1h, and dry at 85°C to obtain the precursor; Then transfer the dry precursor from the beaker to an agate mortar and grind for half an hour, then transfer the uniformly ground powder sample to a 10L capacity argon atmosphere reaction furnace, and place the reaction furnace at a rate of 6°C / min Raise the temperature, when the temperature rises to 500°C, keep the temperature constant for 5 hours, then raise the temperature to 850°C at 6°C / min, keep the temperature constant for 10 hours, and finally cool down to room temperature naturally to obtain carbon-composite NaTi 2 (PO 4 ) 3 Material.

[0072] Similar to Example 1, X-ray diffraction analysis, scanning electron microscope analysis, transmission electron microscope analysis and Raman spectroscopic analysis (figure not shown) a...

Embodiment 3

[0074] In a beaker, weigh 50g of disodium phosphate, 800g of metatitanic acid, 508g of phosphoric acid and 50g of Ketjen black, and disperse them in 5L of isopropanol, stir by ball milling at 50Hz for 1h, and dry at 95°C to obtain the precursor; then Transfer the dry precursor from the beaker to an agate mortar and grind for half an hour, then transfer the uniformly ground powder sample to a 10L capacity hydrogen atmosphere reaction furnace, and raise the temperature in the reaction furnace at a rate of 5°C / min. When the temperature was raised to 450°C, the temperature was kept constant for 5 hours, then the temperature was raised to 900°C at 6°C / min, the temperature was kept constant for 10 hours, and finally cooled naturally to room temperature to obtain carbon-composite NaTi 2 (PO 4 ) 3 Material.

[0075] Similar to Example 1, X-ray diffraction analysis, scanning electron microscope analysis, transmission electron microscope analysis and Raman spectroscopic analysis (figu...

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Abstract

The invention provides a mixed water system ionic battery and application thereof. The battery comprises a positive electrode, a negative electrode, a diaphragm and quaternary mixed electrolyte, wherein the negative electrode takes a carbon composite NaTi2(PO4)3 material as a negative active substance; the diaphragm is arranged between the positive electrode and the negative electrode; the quaternary mixed electrolyte is prepared from water, a material selected from one or more of urea, N,N-dimethyl formamide, dimethyl sulfoxide, diethyl carbonate and dimethyl carbonate, a material selected from one or more of sodium perchlorate and sodium nitrate as well as a material selected from one or more of lithium perchlorate or lithium nitrate. The materials of the battery are non-toxic, pollution-free, non-combustible, non-explosible, safe and reliable, the output voltage of the total battery can reach 1.65 V, the energy density is up to 50 Wh / kg, and the service life is up to 1000 times or longer. Compared with the conventional water system ionic battery, the battery provided by the invention has high circulation stability; the manufacturing process is simple; the raw materials are cheapand have wide sources; the energy density is high; the problems that the conventional water system ionic battery has short circulation life and low energy density can be solved effectively.

Description

technical field [0001] The invention relates to a mixed aqueous ion battery and its application in electrochemical energy storage. Background technique [0002] The Frenchman Plant invented the lead-acid battery in 1859. It has experienced nearly 150 years of development. Lead-acid batteries have made great progress in theoretical research, product types and varieties, and product electrical properties. Lead-acid batteries have played an indispensable and important role in various economic fields such as transportation, communication, electric power, military affairs or navigation and aviation. However, lead-acid batteries have low energy density (about 30Wh / kg), short service life (about 200 cycles), and serious environmental pollution (such as the use of acid electrolytes, heavy metals, etc.). [0003] Lithium-ion batteries have higher energy density and longer service life, making them an excellent alternative to lead-acid batteries. But lithium-ion batteries cost more ...

Claims

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Application Information

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IPC IPC(8): H01M10/36H01M4/48H01M4/58
CPCH01M4/48H01M4/58H01M10/36Y02E60/10
Inventor 钱逸泰朱永春侯之国
Owner UNIV OF SCI & TECH OF CHINA
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