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Lithium ion battery negative electrode material and preparation method

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve the problems of large volume expansion and low electronic conductivity of molybdenum disulfide, and achieve high Effect of rate performance, excellent cycle performance and rate performance, long cycle life

Inactive Publication Date: 2018-02-09
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem of the present invention is to overcome the deficiencies of the prior art, and provide a lithium-ion battery negative electrode material and a preparation method to solve the problems of low electronic conductivity of molybdenum disulfide and large volume expansion during charging and discharging

Method used

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  • Lithium ion battery negative electrode material and preparation method
  • Lithium ion battery negative electrode material and preparation method
  • Lithium ion battery negative electrode material and preparation method

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preparation example Construction

[0031] Such as figure 1 As shown, the preparation method of a kind of negative electrode material of lithium ion battery that the embodiment of the present invention provides, comprises:

[0032] (1) Dissolve the molybdenum source and the sulfur source of a certain molar ratio in deionized water, stir evenly, and form a clear solution; wherein, the concentration of the molybdenum source is 8 × 10 -3 ~2×10 -1 mol / L, the concentration of the sulfur source is 1.6×10 -2 ~1mol / L;

[0033] (2) adding catkins to acetone for ultrasonic treatment; then placing catkins in deionized water for vigorous stirring and washing; then drying in vacuum; sending the catkins after pretreatment into a tube furnace, and heat-treating catkins at a certain temperature for 1-3 hours to obtain catkins Derived hollow carbon microtubes; the catkin-derived hollow carbon microtubes are dispersed in the clarified solution obtained in step 1) to form a uniform suspension;

[0034] (3) adding the uniform s...

Embodiment 1

[0042] Weigh 0.304g of sodium molybdate dihydrate and dissolve 0.947g of thiourea in 20mL of deionized water, and stir evenly to obtain a clear solution. The pretreated catkins were sent into a tube furnace, and then heat-treated at 800° C. for 1 hour in an argon atmosphere to obtain catkin-derived hollow carbon microtubes. Then 0.030 g of catkin-derived hollow carbon microtubes was weighed and added to the above clarified solution to form a uniform suspension. Then the obtained homogeneous suspension was poured into a 50ml stainless steel hydrothermal kettle lined with polytetrafluoroethylene, and reacted at 200°C for 24h. The precursor obtained by the reaction was washed with deionized water and ethanol respectively, and dried under vacuum at 80° C. for 12 h. Put the precursor in a crucible, set the temperature at 800°C under an argon atmosphere, and heat-treat for 1 hour. After the reaction, cool with the furnace to obtain MoS 2 / Catkin-derived hollow carbon microtube co...

Embodiment 2

[0044] Weigh 0.706g of ammonium molybdate tetrahydrate and dissolve 1.503g of thioacetamide in 20mL of deionized water, and stir evenly to obtain a clear solution. The pretreated catkins were sent into a tube furnace, and heat-treated at 500° C. for 3 hours in an argon atmosphere to obtain catkin-derived hollow carbon microtubes. Then 0.060 g of catkin-derived hollow carbon microtubes was weighed and added to the above clarified solution to form a uniform suspension. Then the obtained homogeneous suspension was poured into a 50ml stainless steel hydrothermal kettle lined with polytetrafluoroethylene, and reacted at 240°C for 12h. The precursor obtained by the reaction was washed with deionized water and ethanol respectively, and dried under vacuum at 80° C. for 12 h. Put the precursor in a crucible, set the temperature at 500°C under a nitrogen atmosphere, and heat-treat for 3 hours. After the reaction, cool with the furnace to obtain MoS 2 / Catkin-derived hollow carbon mic...

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Abstract

The invention discloses a lithium ion battery negative electrode material and a preparation method. The preparation method comprises the steps of putting willow catkins into acetone and performing ultrasonic treatment; then putting into deionized water to be stirred intensively and washed; next, performing drying in a vacuum condition; putting the pre-processed willow catkins into a tubular furnace to be subjected to heat treatment to obtain willow catkins-derived hollow carbon micro tubes; enabling the willow catkins-derived hollow carbon micro tubes to be dispersed into a clear solution comprising a molybdenum source and a sulfur source, and then performing treatment through a hydrothermal method, washing and vacuum drying to obtain precursor powder; and putting the precursor powder intothe tubular furnace and performing heat treatment in protective atmosphere for a certain time, and then performing furnace cooling to the room temperature to obtain the molybdenum disulfide compositehollow carbon micro tube negative electrode material of the lithium ion battery. The MoS<2> / hollow carbon micro tube composite material prepared by the method has high electrochemical performance; inaddition, the preparation process is simple, the condition is mild and the preparation method is suitable for large-scale industrial production; and by taking the hollow carbon micro tubes as the carrier, the volume expansion effect in the molybdenum disulfide charging and discharging process can be relieved, so that the electronic conductivity of the composite material is improved.

Description

technical field [0001] The invention relates to the fields of new materials and electrochemical energy storage, in particular to a lithium-ion battery negative electrode material and a preparation method. Background technique [0002] With the widespread application of a new generation of lithium-ion batteries in portable mobile electronic devices, however, large mobile devices (electric vehicles, aerospace vehicles, etc.) requirements. At present, commercial lithium-ion batteries mostly use graphite-like carbon materials as negative electrodes, but graphite still has many problems. First, its theoretical capacity limitation cannot meet the requirements of high specific energy, and second, its lithium intercalation potential is close to that of metallic lithium deposition. , when charging and discharging at low temperature or high current, metal lithium is easy to produce dendrite precipitation on the surface of the electrode, which brings safety problems. Therefore, it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/5815H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 滕勇强莫茂松
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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