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A kind of Prussian blue composite silicon negative electrode material and preparation method thereof

A silicon-based anode material, Prussian blue technology, applied in nanotechnology for materials and surface science, battery electrodes, nanotechnology, etc., can solve the problems of large volume change of Si-based materials, complex preparation methods, harsh preparation conditions, etc. , to achieve the effect of improving structural stability and electronic/ionic conductivity, improving electronic/ionic conductivity, and unique composition

Active Publication Date: 2019-07-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above existing problems or deficiencies, in order to solve the problems of large volume change, poor conductivity, complex preparation method and harsh preparation conditions of Si-based materials during the cycle process, the present invention provides a Prussian blue composite silicon-based negative electrode material and its preparation method

Method used

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  • A kind of Prussian blue composite silicon negative electrode material and preparation method thereof
  • A kind of Prussian blue composite silicon negative electrode material and preparation method thereof
  • A kind of Prussian blue composite silicon negative electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Production process such as figure 1 shown

[0031] Step 1. Weigh 0.845g of MnSO 4 -1H 2 Add O (0.05mol / L) and 3g of polyvinylpyrrolidone (PVP, Mw=10000Da) to 50ml of aqueous solution, stir at room temperature for 5min to obtain a transparent solution A; weigh 0.3g of silicon nanoparticles (30-50nm) Disperse in 100ml of absolute ethanol, ultrasonically disperse for 40min, so that the silicon nanoparticles are evenly dispersed in the alcohol solution to obtain solution B; weigh 1.614g of Na3 [Fe(CN) 6 ]-10H 2 O (0.03mol / L), was added into 50ml of aqueous solution, stirred at room temperature for 5min, and adjusted to pH 1.5 with HCl solution to obtain transparent solution C.

[0032] Step 2. At room temperature, mix solution A and solution B prepared in step 1 for 5 minutes under stirring at 600 rpm, and adjust the pH value of the solution to 1.5 with HCl to obtain a mixed solution;

[0033] Step 3. Add solution C dropwise to the mixed solution obtained in step 2 wit...

Embodiment 2

[0045] The following operating conditions of embodiment 1 are changed to: containing Mn 2+ The concentration of the donor solution A is 0.03mol / L, the chelating agent is sodium citrate, the pH value is 2.0, the injection time is 6h, and the stirring reaction time is 10min. Constitute the operating conditions of Example 2.

[0046] By the same test method as in Example 1, test the PBAs@Si core-shell nanocomposite particles prepared in Example 2, see Figure 9 , it can be clearly observed that the composite particles are cubic crystals, and the average size of the particles is 180nm, but the size dispersion needs to be improved.

[0047] By carrying out the electrochemical stability test on the PBAs@Si nanocomposite prepared in Example 2, refer to Figure 10 , the initial charge specific capacity of PBAs@Si nanocomposites is 1371.72mAh / g, which is due to the low Si content; after 50 cycles at a current density of 1A / g (1C), the capacity is maintained at 740.36mAh / g g, the cap...

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Abstract

The invention belongs to the technical field of new energy materials and their applications, and specifically relates to a Prussian blue composite silicon negative electrode material and a preparation method thereof, which are mainly applicable to negative electrode materials of lithium-ion batteries in the field of energy electrochemistry. The present invention adopts crystal regulation technology and in-situ growth technology of crystal particles, grows in-situ on the surface of silicon nanoparticles and coats a layer of PBAs in a water-based environment at normal temperature and pressure, and then carbonizes at a high temperature to simultaneously coat the metal compound on the surface of the Si negative electrode material and carbides. The metal compound shell layer of the material provided by the present invention can limit the volume change of the alloy-type negative electrode material in the process of removing / inserting lithium, and improve the frame structure of the entire negative electrode material and the stability of the SEI film; the carbide shell layer can be electrons / ions in the alloy Diffusion in the type anode material provides an avenue to enhance the electronic / ionic conductivity of the entire anode material.

Description

technical field [0001] The invention belongs to the technical field of new energy materials and their applications, and specifically relates to a Prussian blue composite silicon negative electrode material and a preparation method thereof, which are mainly applicable to negative electrode materials of lithium-ion batteries in the field of energy electrochemistry. Background technique [0002] Lithium ion batteries (LiBs) realize the repeated conversion between chemical energy and electrical energy through exothermic redox reaction, which not only solves the problem of efficient storage and utilization of discontinuous energy such as solar energy, wind energy, and geothermal energy, but also reduces the Environmental pollution has always been a key research field at home and abroad. The main advantages of LiBs are: (1) In terms of physical properties: Li element has the highest electronegativity (-3.04V vs. hydrogen electrode), and the lightest weight (equivalent weight M=6.9...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M10/0525H01M4/60B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/386H01M4/60H01M10/0525Y02E60/10
Inventor 伍芳向勇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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