Sodium-ion battery negative electrode material and preparation method and application thereof

A technology of sodium ion battery and negative electrode material, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of limited application, low Coulomb efficiency, lack of voltage platform, etc.

Inactive Publication Date: 2021-03-02
内蒙古杉杉科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphene can achieve a high specific capacity, but there are many defects that limit its application in sodium-ion batteries, such as its low initial Coulombic efficiency, lack of voltage platform, etc.

Method used

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  • Sodium-ion battery negative electrode material and preparation method and application thereof
  • Sodium-ion battery negative electrode material and preparation method and application thereof
  • Sodium-ion battery negative electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] WS 2 / MoS 2 -Synthesis of G: Sodium molybdate, sodium tungstate and thiourea are added to the graphene oxide solution, wherein (sodium molybdate+sodium tungstate): thiourea:graphene oxide=1:2:0.5, molybdic acid Sodium: sodium tungstate = 1:1, magnetic stirring, stirring for 1h until sodium molybdate and sodium tungstate are fully dissolved in the graphene oxide solution, then transferred to a stainless steel reaction kettle with a polytetrafluoroethylene liner, the temperature is 180 ℃, time 15h, cooling and filtering after reaction, vacuum drying, temperature 95℃, drying time 4h, to obtain WS 2 / MoS 2 -G Standby.

[0043] WS 2 / MoS 2 -Synthesis of G@C: the WS obtained in step 1 2 / MoS 2 -G is blended with petroleum asphalt powder with a softening point of 160°C, WS 2 / MoS 2 -G is mixed with petroleum asphalt powder. The proportion of petroleum asphalt is 30%. After stirring for 5 h, the rotational speed was adjusted to 50 rpm, and the temperature was lowered ...

Embodiment 2

[0046] WS 2 / MoS 2 -Synthesis of G: Sodium molybdate, sodium tungstate and thiourea are added to the graphene oxide solution, wherein (sodium molybdate+sodium tungstate): thiourea:graphene oxide=1:2:0.5, molybdic acid Sodium: sodium tungstate = 1:1, magnetic stirring, stirring for 1h until sodium molybdate and sodium tungstate are fully dissolved in the graphene oxide solution, then transferred to a stainless steel reaction kettle with a polytetrafluoroethylene liner, the temperature is 180 ℃, time 15h, cooling and filtering after reaction, vacuum drying, temperature 95℃, drying time 4h, to obtain WS 2 / MoS 2 -G Standby.

[0047] WS 2 / MoS 2 -Synthesis of G@C: the WS obtained in step 1 2 / MoS 2 -G mixed with petroleum asphalt powder and fused, WS 2 / MoS 2 -G is mixed with petroleum asphalt powder with a softening point of 240°C. The proportion of petroleum asphalt is 30%. Control device, after insulated and stirred for 5 hours, the rotating speed was adjusted to 50 r...

Embodiment 3

[0049] WS 2 / MoS 2 -Synthesis of G: Sodium molybdate, sodium tungstate and thiourea are added to the graphene oxide solution, wherein (sodium molybdate+sodium tungstate): thiourea:graphene oxide=1:2:0.5, molybdic acid Sodium: sodium tungstate = 1:1, magnetic stirring, stirring for 1h until sodium molybdate and sodium tungstate are fully dissolved in the graphene oxide solution, then transferred to a stainless steel reaction kettle with a polytetrafluoroethylene liner, the temperature is 180 ℃, time 15h, cooling and filtering after reaction, vacuum drying, temperature 95℃, drying time 4h, to obtain WS 2 / MoS 2 -G Standby.

[0050] WS 2 / MoS 2 -Synthesis of G@C: the WS obtained in step 1 2 / MoS 2 -G mixed with phenolic resin powder and fused, WS 2 / MoS 2 -G is mixed with phenolic resin powder, the proportion of phenolic resin is 30%, the speed of mixing is 100 rpm, start the temperature control device and raise the temperature to 600 °C at a rate of 50 °C / h, stop the te...

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Abstract

The invention discloses a preparation method and application of a sodium-ion battery negative electrode material. The preparation method comprises the following steps of synthesizing WS2 / MoS2-G, synthesizing WS2 / MoS2-G@C and applying the WS2 / MoS2-G and the WS2 / MoS2-G@C to a sodium-ion battery. The WS2 / MoS2-G is subjected to hydrothermal synthesis to generate WS2, MoS2 and heteroatom-doped grapheneare uniformly cross-linked and compounded together, recompression of graphene is reduced due to existence of sulfide, and good specific surface area and conductivity of graphene are reserved; the flexible graphene can slow down volume expansion, inhibit sulfide aggregation, introduce nanometer size, increase electrochemical activity, increase Na<+> adsorption and obtain more ion storage sites; and the WS2 / MoS2-G@C final product has multiple advantages of sulfide and graphene, the carbon precursor powder is carbonized to generate amorphous carbon with good interlayer spacing, the microstructure of the whole composite material is almost layered, weak Van der Waals' force combination is achieved, large Na<+> can be contained for back-and-forth de-intercalation, and good charging and discharging performance is achieved.

Description

Technical field: [0001] The invention belongs to the field of negative electrode materials for sodium ion batteries, in particular to sodium ion batteries WS with high reversible capacity, excellent rate performance and long cycle life 2 / MoS 2 -G@C anode materials and their preparation methods and applications. Background technique: [0002] With the rapid development of society, people's demand for energy is also increasing. Excellent energy storage systems are crucial to exploiting the potential of this new energy source. At present, lithium-ion batteries have been widely used in portable electronic markets such as mobile phones and notebook computers. In addition, lithium-ion batteries also have broad application prospects in large-scale energy storage systems such as electric vehicles, smart grids, and renewable power stations. With the rise and rapid development of lithium-ion batteries, people's demand for lithium resources is also increasing. However, the storag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/054
CPCH01M4/366H01M4/5815H01M4/583H01M10/054H01M2004/027Y02E60/10
Inventor 李俊利耿海龙刘金峰刘智君姚恩东
Owner 内蒙古杉杉科技有限公司
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