Nitrogen-doped carbon anode material modified by nano tin and preparation method thereof

A nitrogen-doped carbon, anode material technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of low first coulombic efficiency and poor cycle life of tin-based anodes, and achieve cost Low, improved conductivity, simple process effect

Active Publication Date: 2019-01-04
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0008] The main purpose of the present invention is to provide a nano-tin modified nitrogen-doped carbon negative electrode material and its preparation method, aiming to solve the problems of low initial coulombic efficiency and poor cycle life of tin-based negative electrodes in the prior art

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  • Nitrogen-doped carbon anode material modified by nano tin and preparation method thereof
  • Nitrogen-doped carbon anode material modified by nano tin and preparation method thereof
  • Nitrogen-doped carbon anode material modified by nano tin and preparation method thereof

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preparation example Construction

[0034] refer to figure 1 , the embodiment of the present invention proposes a method for preparing a nano-tin modified nitrogen-doped carbon negative electrode material, which is characterized in that it includes the following steps:

[0035] S1: adding polyvinylpyrrolidone into absolute ethanol according to the first mass ratio, stirring continuously, and dissolving to obtain a solution;

[0036] S2: adding stannous chloride dihydrate into the solution in a stirring state under a specified process according to the second mass ratio, and continuously stirring to obtain a mixed solution;

[0037] S3: Add distilled water to the mixed solution in the stirring state according to the first molar ratio, and continue stirring for a specified time to obtain a precursor dispersion;

[0038] S4: Put the precursor dispersion in a vacuum drying oven and dry it with a specified drying process to obtain a precursor;

[0039] S5: heat-treating the precursor in an inert atmosphere with a sp...

Embodiment 1

[0065] The nitrogen-doped carbon negative electrode material modified by nano-tin in this embodiment 1 (in the nitrogen-doped carbon negative electrode material modified by nano-tin in this embodiment 1, the mass fraction of tin element is 26wt%, and the atomic ratio of nitrogen and carbon is 2.7: 97.3) Preparation:

[0066] Step 1: Take 453mg of PVP and add it to 20mL of absolute ethanol, stir continuously at a stirring speed of 1000r / min, and dissolve to obtain a solution;

[0067] Step 2: 88mg SnCl 2 2H 2 O is quickly added in the solution of step 1 in a stirring state, and continuously stirred to obtain a mixed solution;

[0068] Step 3: Take 35.1uL of distilled water and add it to the mixed solution of Step 2 in a stirring state, and continue stirring for 6 hours to obtain a precursor dispersion;

[0069] Step 4: Dry the precursor dispersion obtained in Step 3 in a vacuum oven at 50°C for 12 hours to obtain the precursor of the target product;

[0070] Step 5: Under t...

Embodiment 2

[0074] The nitrogen-doped carbon negative electrode material of present embodiment 2 nano-tin modification (in the nitrogen-doped carbon negative electrode material of present embodiment 2 modification of nano-tin, the mass fraction of tin element is 5wt%, and the atomic ratio of nitrogen and carbon is 5.8: 94.2) Preparation:

[0075] Step 1: Add 1100mg of PVP into 15mL of absolute ethanol, and continue to stir at a stirring speed of 1500r / min to dissolve to obtain a solution;

[0076] Step 2: 43.8mg SnCl 2 2H 2 O is quickly added in the solution of step 1 in a stirring state, and continuously stirred to obtain a mixed solution;

[0077] Step 3: Take 69.8uL of distilled water and add it to the mixed solution of Step 2 in a stirring state, and stir for 0.5h to obtain a precursor dispersion;

[0078] Step 4: Dry the precursor dispersion obtained in Step 3 in a vacuum oven at 80°C for 24 hours to obtain the precursor of the target product;

[0079] Step 5: Under the protectio...

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Abstract

The invention discloses a nano tin-modified nitrogen-doped carbon anode material and a preparation method thereof, comprising the following steps: adding polyvinylpyrrolidone into absolute ethanol according to a first mass ratio, continuously stirring, and dissolving to obtain a solution; Adding stannous chloride dihydrate into the solution according to a second mass ratio, and continuously stirring to obtain a mixed solution; Adding distilled water into the mixed solution according to a first molar ratio, continuously stirring for a specified time to obtain a precursor dispersion; The precursor dispersion is placed in a vacuum drying oven and dried by a designated drying process to obtain a precursor; The precursor was heat-treated in an inert atmosphere by a specified heat treatment process to obtain a nitrogen-doped carbon anode material modified with nano tin. The nano tin modified nitrogen-doped carbon negative electrode material prepared by the preparation method of the inventionuniformly disperses in the nitrogen-doped carbon material, has high first coulombic efficiency, specific capacity, rate performance and capacity retention rate, and has important application value.

Description

technical field [0001] The invention relates to the technical field of new energy, in particular to a nitrogen-doped carbon negative electrode material decorated with nanometer tin and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in electronic products, electric vehicles, and energy storage systems. However, the currently used commercial graphite anode materials, due to their low theoretical capacity (372mAh / g) and weak rate performance, force people to pursue new high-performance lithium-ion battery anode materials. [0003] Tin has a higher theoretical capacity (992mAh / g, 7262mAh / cm -3 ) and is rich in content and non-toxic, which is expected to replace graphite as a new generation of negative electrode materials. However, tin has serious volume changes during charging and discharging, which can lead to powdering or even shedding of electrode materials, thereby shortening the cycle life of tin. [0004] By reducing th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/387H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 刘鹏褚春波张耀
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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