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Preparation method of carbon tube-modified molybdenum disulfide negative pole material of lithium ion battery

A technology of lithium molybdenum disulfide and ion batteries, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as unsatisfactory industrial applications, lower structural stability, and reversible capacity fading, and achieve improved structural stability and improved The effect of high conductivity and specific capacity

Inactive Publication Date: 2018-10-23
SHANXI CHANGZHENG POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, during the cycling process, molybdenum disulfide has disadvantages such as poor conductivity and large volume effect during lithium ion intercalation and extraction; at the same time, the low-activity molybdenum element generated by electrochemical deintercalation / intercalation reduces the structural stability, resulting in rapid reversible capacity fading. , these problems make it unable to meet the requirements of industrial applications

Method used

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  • Preparation method of carbon tube-modified molybdenum disulfide negative pole material of lithium ion battery
  • Preparation method of carbon tube-modified molybdenum disulfide negative pole material of lithium ion battery
  • Preparation method of carbon tube-modified molybdenum disulfide negative pole material of lithium ion battery

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Effect test

Embodiment 1

[0027] 1) Preparation of precursor: according to the molar concentration ratio, L-cysteine: (NH 4 ) 2 MoO 4 =5, (NH 4 ) 2 MoO 4 : Multi-walled carbon nanotubes=1.5 Weigh corresponding materials, i.e. L-cysteine, (NH 4 ) 2 MoO 4 and multi-walled carbon nanotubes, L-cysteine, (NH 4 ) 2 MoO 4 Add the multi-walled carbon nanotubes into deionized water, stir and mix evenly, then add N-methylpyrrolidone, and add N-methylpyrrolidone and deionized water according to the volume ratio of 1.5. Gained solution is transferred to polytetrafluoroethylene hydrothermal kettle, 5 o C / min rate of heating up to 200 o C, constant temperature reaction 12h, obtain solid product, after finishing, obtain solid product with deionized water or ethanol washing, solid product is in 60 o C and dried for 6 hours to obtain the precursor.

[0028] 2) The above precursors were transferred to a quartz boat, placed in a tubular heating furnace, and circulated in a nitrogen atmosphere for 5 o C / min ...

Embodiment 2

[0031] 1) Preparation of precursor: According to the molar concentration ratio, thiourea: Na 2 MoO 4 =7, Na 2 MoO 4 : Multi-walled carbon nanotubes = 1 Weigh the corresponding materials, will be thiourea, Na 2 MoO 4 Add deionized water with multi-walled carbon nanotubes, stir and mix evenly, add N-methylpyrrolidone, add N-methylpyrrolidone and deionized water according to the volume ratio of 1, and transfer the obtained solution to polytetrafluoroethylene water hot kettle, 6 o C / min rate of heating up to 180 o C, constant temperature reaction 18h, obtain solid product, after finishing, the solid product that obtains with deionized water or ethanol washing, solid product is in 60 o C and dried for 10 hours to obtain the precursor.

[0032] 2) The above precursors were transferred to a quartz boat, placed in a tubular heating furnace, and circulated in an argon atmosphere for 10 o C / min rate of heating up to 750 o C calcination, the holding time is 4h, after the reactio...

Embodiment 3

[0035] 1) Preparation of precursor: According to the molar concentration ratio, thiourea: (NH 4 ) 2 MoO 4 =6, (NH 4 ) 2 MoO 4 : Single-walled carbon nanotubes=1.5 Weigh the corresponding materials. Thiourea, (NH 4 ) 2 MoO 4 Add deionized water with single-walled carbon nanotubes, stir and mix evenly, add N-methylpyrrolidone, add N-methylpyrrolidone and deionized water according to a volume ratio of 2, and transfer the resulting solution to polytetrafluoroethylene water hot kettle, 3 o C / min rate of heating up to 250 o C, constant temperature reaction 12h, obtain solid product, after finishing, the solid product that obtains with deionized water or ethanol washing, solid product is in 80 o C and dried for 6 hours to obtain the precursor.

[0036] 2) The above precursors were transferred to a quartz boat and placed in a tubular heating furnace, under the circulation of argon atmosphere, 3 o C / min rate of heating up to 800o C calcination, the holding time is 3h, after...

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Abstract

The invention discloses a preparation method of a carbon tube-modified molybdenum disulfide negative pole material of a lithium ion battery. The preparation method comprises compounding an organic sulfide, a polymolybdate and carbon nanotubes according to a certain ratio, carrying out a hydrothermal reaction process to obtain a solid product, washing the solid product through deionized water or ethanol, drying the solid product to obtain a precursor, calcining the precursor in an inert atmosphere at a calcining temperature of 600-800 DEG C, keeping the temperature for 2-6h, cooling the productin a furnace to the room temperature so that a molybdenum disulfide-carbon nanotube composite material is obtained, and carrying out SEM analysis, XRD analysis, cycle test and conductivity test on the composite material to obtain the one-dimensional rod-shaped nitrogen-modified molybdenum oxide negative pole material of a lithium ion battery. The preparation method improves the conductivity of the electrode material, enhances the stability of the lithium insertion / extraction active site in the crystal structure, improves the intercalation or deintercalation ability of lithium ions between layers and realizes a high specific capacity, good cycle performances and electrical conductivity.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium ion battery electrode materials, in particular to a preparation method of a carbon tube modified molybdenum disulfide lithium ion battery negative electrode material. Background technique [0002] As one of the most potential energy storage materials in the 21st century, lithium-ion batteries have gradually become a hot research direction. Traditional lithium-ion batteries usually use carbon as the negative electrode material. Carbon materials have a series of advantages such as low price and long cycle life, but their specific capacity is small, so it is difficult to be widely used in industry. Molybdenum disulfide, as a new lithium-ion battery negative electrode material, has a layered structure similar to graphite: Mo-S-Mo, Mo-S in the layer, Mo-Mo are combined with ionic bonds, and the layers between layers Combined by weak van der Waals force. Electrochemical studies have fou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5815H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 邱继一承
Owner SHANXI CHANGZHENG POWER TECH CO LTD
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