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Preparation method for molybdenum disulfide/carbon microsphere negative electrode material of lithium ion battery

A lithium-ion battery and molybdenum disulfide technology, applied in battery electrodes, secondary batteries, negative electrodes, etc., can solve the problems of poor controllability of material structure and morphology, expensive template method, harsh reaction conditions, etc., and achieve excellent Electrochemical performance and cycle performance, material structure and morphology can be controlled, and the effect of mild conditions

Inactive Publication Date: 2017-08-18
HEFEI GUOXUAN HIGH TECH POWER ENERGY CO LTD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the prior art, the chemical preparation of metal oxide / sulfide materials with pore structure is mainly carried out by template method and template-free method. However, the template method is expensive, the process is complicated and the output is low, and it is difficult to industrialize production. The reaction conditions are relatively harsh and the controllability of the material structure and morphology is poor

Method used

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  • Preparation method for molybdenum disulfide/carbon microsphere negative electrode material of lithium ion battery
  • Preparation method for molybdenum disulfide/carbon microsphere negative electrode material of lithium ion battery
  • Preparation method for molybdenum disulfide/carbon microsphere negative electrode material of lithium ion battery

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Embodiment 1

[0028] The preparation method of the molybdenum disulfide / carbon microsphere lithium ion battery negative electrode material in this embodiment is as follows: 0.1g polystyrene microspheres, 0.1g sodium molybdate dihydrate, 0.14g thiourea and 0.05g glucose are dissolved in 40mL of deionized water to obtain a mixed solution (wherein, the mass-volume concentration of polystyrene microspheres is 2.5 mg / mL, and the molar concentrations of sodium molybdate dihydrate, thiourea and glucose are respectively 10.33 mmol / L, 45.98 mmol / L and 6.95 mmol / L mmol / L), the mixed solution was placed in a 50 mL reaction kettle, reacted at 200° C. for 10 hours, naturally cooled to room temperature, and the solution after the reaction was centrifugally washed and dried to obtain black powder.

[0029] The obtained black powder was heated and sintered in a nitrogen atmosphere at a heating rate of 2°C / min, firstly heated to 200°C, held for 2 hours, then heated to 700°C, held for 2 hours to obtain lithiu...

Embodiment 2

[0035] Dissolve 0.1 g of polystyrene microspheres (500 nm in diameter), 0.1 g of sodium molybdate dihydrate, 0.14 g of thiourea and 0.1 g of glucose in 40 mL of deionized water to obtain a mixed solution (wherein, the mass of polystyrene microspheres - Volume concentration is 2.5mg / mL, and the molar concentration of sodium molybdate dihydrate, thiourea and glucose is respectively 10.33mmol / L, 45.98mmol / L and 13.89mmol / L), mixed solution is inserted into 50mL reactor, at 200 The reaction was carried out at ℃ for 12 hours, then cooled to room temperature naturally, the solution after the reaction was washed by centrifugation, and dried to obtain a black powder.

[0036] The obtained black powder was heated and sintered under a nitrogen atmosphere at a heating rate of 2°C / min, firstly heated to 200°C, held for 2 hours, then heated to 800°C and held for 2 hours;

[0037] The molybdenum disulfide / carbon microsphere lithium ion battery anode material prepared in Example 2 was charac...

Embodiment 3

[0039] The difference between Example 3 and Example 2 is that the amount of polystyrene microspheres added is adjusted. Weigh 0.2 g of polystyrene microspheres and dissolve them in 40 mL of deionized water. Other steps are the same as in Example 2, and the prepared negative electrode material is 1Ag -1 The first discharge is easy to be 705.2 mAh / g, the first efficiency is 55.6%, and the discharge capacity after 500 cycles is 648.1 mAh / g.

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Abstract

The invention provides a preparation method for a molybdenum disulfide / carbon microsphere negative electrode material of a lithium ion battery, and relates to the technical field of a battery material. The preparation method comprises the steps of dissolving polystyrene microspheres, sodium molybdate dihydrate, thiourea and glucose into deionized water to obtain a mixed solution; putting the mixed solution into a reaction kettle, performing heat preservation at a temperature of 180-230 DEG C for 8-24h and cooling; and next, performing centrifuging, washing, drying and sintering on the reacted mixed solution. The preparation method provided by the invention is simple in method, and industrial production can be realized easily; and in addition, the molybdenum disulfide / carbon microspheres can be uniformly distributed in the prepared molybdenum disulfide / carbon microsphere negative electrode material of the lithium ion battery, and excellent electrochemical performance is achieved.

Description

technical field [0001] The invention relates to the technical field of battery materials, and relates to a preparation method of a molybdenum disulfide / carbon microsphere lithium ion battery negative electrode material. Background technique [0002] Lithium-ion batteries are gradually being used in electric vehicles and energy storage devices, however, the theoretical capacity of commercial graphite is only 372mAhg -1 , which severely limits its application in electric vehicles and energy storage devices. Molybdenum disulfide nanosheets, which have a similar structure to graphite, have received extensive attention in lithium-ion batteries due to their high theoretical capacity, which is mainly due to the ability to store a large amount of lithium ions in two-dimensional sheets. . However, its poor electrical conductivity and large volume change during the electrochemical process result in poor cycle performance and rate performance as an electrode material. [0003] Nanos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/0525
CPCH01M4/5815H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 宋磊
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY CO LTD CO LTD
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