A positive electrode material of a magnesium secondary battery and a preparation method thereof

A technology for magnesium secondary batteries and positive electrode materials, applied in secondary batteries, battery electrodes, nanotechnology for materials and surface science, etc., can solve the problem of sulfide positive electrode materials in magnesium secondary batteries that have not been applied and battery capacity attenuation and other problems, to achieve the effect of easy large-scale production, simple steps and methods, and abundant preparation raw materials

Active Publication Date: 2018-12-18
UNIV OF SCI & TECH LIAONING
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Problems solved by technology

Some researchers have prepared MoS with different structural characteristics through chemical reactions between liquids 2 It is used as a cathode material in magnesium secondary batteries, however, the discharge specific capacity of the battery is only 2-25mAh g -1 , the cycle efficiency is 10%~40%
TiS with layered structure 2 , allowing ions to intercalate into the gaps of the sheets, the researchers compared the two-dimensional layered (1-TiS 2 )TiS 2 and three-dimensional cubic (c-TiS 2 )TiS 2 at 0.2mol L -1 The chemical magnesium intercalation performance in the dibutyl magnesium electrolyte, respectively obtained Mg 0.25 TiS 2 and Mg 0.22 TiS 2 , can realize the reversible deintercalation of magnesium ions, but the capacity fading of the battery is relatively serious
[0005] Ferrous disulfide (FeS 2 ) is an important transition metal sulfide, which has attracted extensive attention from researchers due to its high theoretical energy and environmental protection. 2 The scope of application is also relatively wide, but there is no application in magnesium secondary battery sulfide cathode materials

Method used

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  • A positive electrode material of a magnesium secondary battery and a preparation method thereof
  • A positive electrode material of a magnesium secondary battery and a preparation method thereof
  • A positive electrode material of a magnesium secondary battery and a preparation method thereof

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preparation example Construction

[0030] A preparation method of a positive electrode material for a magnesium secondary battery, the specific method is as follows:

[0031] a. Preparation of composite material ferrous disulfide / nano carbon:

[0032] Mix the iron source and the sulfur source in a molar ratio, and add them into 150-170mL of deionized water, stir vigorously until the mixture is completely dissolved, then add acid-treated carbon materials into the mixed solution, and fully stir for 0.5-1h, Transfer the mixed liquid to a reaction kettle lined with polytetrafluoroethylene for heating, keep stirring rapidly during the hydrothermal reaction, cool to room temperature naturally after the hydrothermal reaction, and perform centrifugation at a speed of 8000-10000r / min. The product was repeatedly washed with absolute ethanol and deionized water, and finally freeze-dried, pre-frozen at minus 70°C, and finally brought to room temperature to complete the freeze-drying process to obtain a composite material o...

Embodiment 1

[0044] Embodiment 1: the weight percent of carbon material and ferrous disulfide in the ferrous disulfide / nano carbon composite material of the present embodiment is: carbon material 2%, ferrous disulfide 98%

[0045] Multi-walled carbon nanotubes (MWCNTs) need to be pickled, and a certain amount of MWCNTs is placed in a mixed solution of hydrochloric acid (98% concentration) and nitric acid (98% concentration) at a volume ratio of 3:1 for ultrasonic dispersion. , after uniform dispersion, repeated washing was performed until the solution was neutral, and finally filtered, and the acid-washed MWCNTs were vacuum-dried at 60°C. Take 40 mg of acid-washed MWCNTs and place them in 40 mL of deionized water for ultrasonic dispersion. After the dispersion is uniform, transfer them to 2.22 g of FeSO 4 ·7H 2 O and 3.87g C 3 h 7 NO 2 In the S mixed solution (the molar ratio is 1:4), the total amount of deionized water in the solution is 160mL, and it is fully stirred. Transfer the a...

Embodiment 2

[0050] Embodiment 2: The weight percentages of carbon material and ferrous disulfide in the ferrous disulfide / nano-carbon composite material of this embodiment are: 2% of carbon material and 98% of ferrous disulfide.

[0051] Take 40mg of graphene and place it in 40mL of deionized water for ultrasonic dispersion. After the dispersion is uniform, transfer it to 2.22g of FeSO 4 ·7H 2 O and 3.87g C 3 h 7 NO 2 In the S mixed solution, the total amount of deionized water in the solution is 160mL, and fully stirred. Transfer the above mixed solution to a clean, smooth polytetrafluoroethylene-lined reactor (volume 200 mL). Under the condition of 160 ℃, the airtight reactor containing the mixture is heated and stirred by an oil bath (such as figure 1 shown), the stirring speed is 600-800rpm, the hydrothermal reaction is 12h, cooled to room temperature, the obtained product is first separated by a centrifuge, then repeatedly washed with deionized water and absolute ethanol, and fi...

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Abstract

A positive electrode material of a magnesium secondary battery, the positive electrode material is a ferrous disulfide / nanometer carbon composite material formed by in-situ cladding of ferrous disulfide with a carbon nanometer material, and the weight percentage of the carbon material and the ferrous disulfide in the ferrous disulfide / nano carbon composite material is 2 to 5 percent of carbon material and 98 to 95 percent of ferrous disulfide. The invention adopts ferrous disulfide as a basic material, adopts doped nanometer carbon material to carry out in-situ carbon cladding, and obtains thefinal composite material by ''one-step hydrothermal method''. The material can provide more channels for the reversible diffusion of magnesium ions when used for a positive electrode material of a magnesium secondary battery, so that the battery has higher charge-discharge specific capacity and excellent cycle performance. The synthesis of the base material of the invention only needs two elements, the step method is simple and convenient, does not need high-temperature calcination, can be directly applied after preparation, the prepared raw material is rich, the cost is low, and method is easy to produce on a large scale.

Description

technical field [0001] The invention relates to the field of secondary batteries, in particular to a positive electrode material for a magnesium secondary battery and a preparation method thereof. Background technique [0002] As the world's energy consumption continues to increase and environmental pollution is increasing, people are generally aware of the importance of developing and utilizing green and renewable energy. Therefore, some new environmentally friendly and high-capacity secondary batteries have received extensive attention from researchers, including lithium-ion batteries, lead-acid batteries, and nickel-cadmium batteries. However, lithium-ion batteries have the problems of high cost and poor safety, and lead-acid batteries and nickel-cadmium batteries contain harmful elements, which can cause pollution to the environment. [0003] Metal magnesium and metal lithium are diagonal elements, so its chemical properties and ionic radius have many similarities with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/1397H01M10/054B82Y30/00
CPCB82Y30/00H01M4/1397H01M4/366H01M4/5815H01M4/625H01M10/054Y02E60/10
Inventor 路金林李卓张晓伟
Owner UNIV OF SCI & TECH LIAONING
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