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Lithium ion battery taking schwertmannite as positive electrode material

A lithium-ion battery and cathode material technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor conductivity, unsatisfactory high-current charge and discharge performance, and expensive lithium cobalt oxide materials for large batteries. Variety, safe and reliable use, high-capacity effects

Inactive Publication Date: 2016-03-23
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium cobalt oxide materials are expensive and cannot be used for large batteries above 5Ah; lithium manganese oxide materials have more prominent high-temperature performance and capacity attenuation problems; lithium iron phosphate materials have poor conductivity, resulting in unsatisfactory high-current charge and discharge performance

Method used

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  • Lithium ion battery taking schwertmannite as positive electrode material
  • Lithium ion battery taking schwertmannite as positive electrode material
  • Lithium ion battery taking schwertmannite as positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 500mL of distilled water to the three-neck flask, preheat in a water bath at 85°C; weigh 2.6g of Fe 2 (SO 4 ) 3 , poured into 500mL of preheated distilled water; quickly insert a mechanical stirring paddle, and keep stirring at 85°C for 1h; stop stirring, cool down, pour the supernatant, and wash the solid with distilled water 3 times, 500mL each time. After centrifugal separation and freeze-drying, the schwertmannite mineral powder is obtained. The X-ray diffraction analysis and SEM of the product obtained are as follows: figure 1 , figure 2 shown.

[0024] Mix the prepared schwertmannite mineral powder as the positive electrode active material with the conductive agent acetylene black and polytetrafluoroethylene (PTFE) binder in a certain mass ratio (80:10:10), put it into a small beaker, and add an appropriate amount of Anhydrous ethanol, ultrasonically disperse evenly, then stir and mix thoroughly with a glass rod until agglomerated. Put the agglomerated ...

Embodiment 2

[0026] Add 500mL of distilled water to the three-neck flask, preheat in a water bath at 85°C; weigh 2.6g of Fe(NO 3 ) 3 , poured into 500mL of preheated distilled water; quickly insert a mechanical stirring paddle, and keep stirring at 85°C for 1h; stop stirring, cool down, pour the supernatant, and wash the solid with distilled water 3 times, 500mL each time. After centrifugal separation and freeze-drying, the schwertmannite mineral powder is obtained.

[0027] Other steps are with embodiment 1.

Embodiment 3

[0029] Add 500mL of distilled water to the three-neck flask, preheat in a water bath at 85°C; weigh 2.6g of FeCl 3 , poured into 500mL of preheated distilled water; quickly insert a mechanical stirring paddle, and keep stirring at 85°C for 1h; stop stirring, cool down, pour the supernatant, and wash the solid with distilled water 3 times, 500mL each time. After centrifugal separation and freeze-drying, the schwertmannite mineral powder is obtained.

[0030] Other steps are with embodiment 1.

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Abstract

The invention provides a lithium ion battery taking schwertmannite as a positive electrode material. A manufacturing method for the battery comprises the following steps of: (1) adding a certain amount of distilled water into a three-mouth flask and performing preheating in water bath with the temperature of 85 DEG C; (2) weighing a certain amount of iron salt, pouring the iron salt into the preheated distilled water, and stirring at a constant temperature of 85 DEG C for 1 hour; and (3) stopping stirring, cooling, pouring out a supernatant liquor, washing solid with the distilled water for 3 times, performing centrifugal separation, and performing freeze-drying to obtain schwertmannite powder. A process is simple, convenient and easy to control; and a structural form of the obtained schwertmannite is a crystalline form or an amorphous form. The obtained schwertmannite has very good compatibility with key components such as a diaphragm, an electrolyte solution and the like in the commercialized lithium ion battery; and the lithium ion battery taking the schwertmannite as the positive electrode material has relatively high capacity, does not pollute the environment and is safe and reliable to use.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a positive electrode material of a lithium ion battery and a lithium ion battery containing the positive electrode material. Background technique [0002] In recent years, large-capacity lithium-ion batteries are regarded as the main choice for large-scale energy storage batteries such as electric vehicles and energy storage power stations in the future, and their application research continues to increase. With the development of large-scale and gigantic lithium-ion batteries, battery cost has become a key issue in the development of lithium-ion batteries. At present, in commercially produced lithium-ion batteries, the cost of cathode materials accounts for about 40% of the cost of the entire battery. Traditional lithium-ion battery cathode materials mainly include lithium cobalt oxide, lithium manganese oxide, and lithium iron phosphate. Lithium cobalt oxide materials are e...

Claims

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Application Information

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IPC IPC(8): H01M4/52H01M4/58H01M10/0525
CPCH01M4/52H01M4/5825H01M10/0525Y02E60/10
Inventor 阮艳莉刘萍刘京京何艺伟韩煦赵昭
Owner TIANJIN POLYTECHNIC UNIV
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