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Sandwich-shaped hollow spherical lithium ion battery anode material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of unstable electrochemical performance and high cost, improve electrochemical performance, improve conductivity, and improve point-to-point effect of contact

Active Publication Date: 2019-12-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the literature review that graphene is currently used to improve sulfides mostly by simple mixed hydrothermal methods [Chen D, Ji G, Ding B, et al.Nanoscale, 2013, 5(17): 7890-7896.]. Improve the disadvantages of tungsten disulfide to a certain extent, but the volume expansion phenomenon is still relatively obvious
Furthermore, the hollow spherical structure prepared by carbon coating [Xu W, Wang T, WuS, et al. Journal of Alloys & Compounds, 2016, 698 (2017): 68-76.] can not only improve the conductivity, but also predict Leave the space required for volume expansion of sulfide, but its cost is high, and its electrochemical performance is unstable

Method used

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  • Sandwich-shaped hollow spherical lithium ion battery anode material and preparation method thereof
  • Sandwich-shaped hollow spherical lithium ion battery anode material and preparation method thereof
  • Sandwich-shaped hollow spherical lithium ion battery anode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0037] (1) Graphene oxide (GO) was prepared by the modified Hummers method. 2 grams of graphite and 2 grams of potassium nitrate (KNO 3 ) was placed in a three-necked flask, and the flask was placed in an ice-water bath at 0°C, and 96 milliliters of concentrated sulfuric acid (H 2 SO 4 , 96-98wt%). After mixing and stirring evenly, slowly add 12 grams of potassium permanganate (KMnO 4 ), reacted for 90 minutes. After the low-temperature reaction was completed, the temperature was raised to 35° C., and after stirring at a constant temperature for 2 hours, 80 milliliters of deionized water was slowly added dropwise to the mixture, and then 200 milliliters of deionized water and 10 milliliters of hydrogen peroxide (H2O2) were added successively. 2 o 2 aqueous solution, the mass percentage of hydrogen peroxide is 30%), stirred for 20 minutes. After the reaction was cooled, 60 milliliters of hydrochloric acid (aqueous hydrogen chloride solution, 30% by mass of hydrogen chlori...

Embodiment 2

[0048] The difference between embodiment 2 and embodiment 1 is that the reduced graphene oxide hollow sphere (Hs-rGO) described in step 4), tungsten chloride (WCl 6 ) (wherein the molar ratio of carbon: tungsten is 2:1) and 1.6904 g of thioacetamide (TAA) were dissolved in 25 ml of deionized water, ultrasonicated for 1 hour, and magnetically stirred for 30 minutes; then transferred to a 50 ml stainless steel reaction kettle at 200 ° C Keep it warm for 24 hours and cool down to room temperature naturally. Other steps are identical with embodiment 1.

[0049] will attach image 3 -6 is compared, NG@WS in embodiment 1 2 Under the current density of 1000 mA / g of @Hs-rGO material, the discharge capacity of the electrode material after 100 cycles can still reach 346.3 mAh / g, and the discharge capacity of the electrode material in Example 2 after 100 cycles It can still reach 348.7 mAh / g; NG@WS in Example 2 2 Rate curves of the @Hs-rGO material at different current densities. Und...

Embodiment 3

[0051] The difference between embodiment 3 and embodiment 1 described reduced graphene oxide hollow sphere (Hs-rGO), tungsten chloride (WCl 6 ) (the carbon: tungsten molar ratio is 4:1) and 1.6904 g of thioacetamide (TAA) were dissolved in 25 ml of deionized water, ultrasonicated for 1 hour, and magnetically stirred for 30 minutes; then transferred to a 50 ml stainless steel reaction kettle at 200 ° C Keep it warm for 24 hours and cool down to room temperature naturally. Other steps are identical with embodiment 1.

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Abstract

The invention discloses a sandwich-shaped hollow spherical lithium ion battery anode material and a preparation method thereof. A reduced graphene oxide hollow sphere is used as a matrix, tungsten chloride and thioacetamide are used as raw materials, and under a hydrothermal condition, a tungsten disulfide nanosheet can be grown on the surface of the hollow sphere vertically in situ. The entire electrode material is coated with a third layer shell by a reflow soldering method. Finally, a NG@WS2@Hs-rGO type sandwich anode material is prepared by nitrogen doping in a heat treatment process, so as to improve the disadvantage of volume expansion of the tungsten disulfide. The method has a simple principle and a mild condition and can prepare alithium ion battery anode material with excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium-ion batteries, and more specifically relates to a method for preparing nitrogen-doped graphene@tungsten disulfide@reduced graphene oxide hollow spheres (NG@WS) by using reduced graphene oxide hollow spheres 2 @Hs-rGO) lithium ion battery anode material and its preparation method. Background technique [0002] With the rapid development of society, the challenges of environmental pollution and energy crisis are becoming increasingly severe, and green energy has become a research and development hotspot in countries all over the world. As a new type of clean rechargeable power source, lithium-ion batteries have the advantages of light weight, low pollution, high working voltage, high energy density, and long cycle life. They have shown broad application prospects in the fields of national defense, electric vehicles, and electronics. Known as the ideal power supply i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/0525
CPCH01M4/366H01M4/5815H01M4/583H01M10/0525Y02E60/10
Inventor 郭瑞松厉婷婷李福运罗亚妮
Owner TIANJIN UNIV
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