Lithium ion battery negative electrode material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, which is applied in the fields of energy storage materials and lithium ion batteries, can solve the problems of cumbersome steps, high cost, time-consuming and material-consuming processes, and achieves a controllable preparation process, simple preparation method and low cost. Effect

Inactive Publication Date: 2014-06-18
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method steps for forming core-shell structure silicon material electrodes in the above two documents are slightly cumbersome, and the process is time-consuming, material-intensive, and costly.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Put silicon particles and dopamine with a mass of 0.2 g in a solution containing tris at a concentration of 0.1 mM, and continuously stir and react for 24 hours, then centrifuge and wash the reaction product 3 times with deionized water, Dry at 80° C. for 24 hours in a vacuum to obtain a precursor.

[0036] (2) Calcining the precursor at 800°C for 4 hours in an argon-hydrogen mixed gas atmosphere to obtain carbon-coated silicon particles;

[0037] (3) Put carbon-coated silicon particles in 0.5M NaOH aqueous solution at 60°C for 10 minutes, wash with deionized water three times, and dry at 80°C in vacuum for 24 hours to obtain lithium-ion battery anode materials.

[0038] figure 2 It is the charge-discharge cycle diagram of the negative electrode material obtained in this example. image 3 It is a TEM image. Such as figure 2 It is shown that under 1C rate, charging and discharging in the range of 0.01 ~ 1.5V, the battery can still maintain about 850mAh / g after ...

Embodiment 2

[0040] (1) Put silicon particles and dopamine with a mass of 0.2 g in a solution containing tris at a concentration of 0.1 mM, and continuously stir and react for 12 hours, then centrifuge and wash the reaction product 3 times with deionized water, Dry at 80° C. for 12 hours in a vacuum to obtain a precursor.

[0041] (2) Calcining the precursor at 400°C for 3 hours in an argon atmosphere to obtain carbon-coated silicon particles;

[0042] (3) Put carbon-coated silicon particles in 0.5M KOH aqueous solution at 30°C for 2 minutes, wash with deionized water three times, and dry at 60°C in vacuum for 12 hours to obtain lithium-ion battery negative electrode materials.

[0043] Figure 4 TEM image of the negative electrode material. It can be seen from the TEM image that the void formed by 2-minute etching is not as large as that formed by 10-minute etching.

Embodiment 3

[0045] (1) In the tris solution with a concentration of 0.1mM, put silicon particles and dopamine with a mass of 0.2g, stir for 24 hours and react, then wash the reaction solution with deionized water and centrifuge for 3 times Placed at 80° C. for 24 hours in vacuum to obtain a precursor.

[0046] (2) Calcining the precursor obtained in step (1) at 800°C for 4 hours under the condition of argon-hydrogen mixed gas to obtain carbon-coated silicon particles.

[0047] (3) Put the product obtained in step (2) into a 0.5M NaOH aqueous solution at 80°C for 5 minutes, wash it with deionized water for 3 times, and then dry it in a vacuum oven at 80°C for 24 hours to obtain the negative electrode material for lithium-ion batteries .

[0048] Figure 5 TEM image of the negative electrode material.

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Abstract

The invention discloses a lithium ion battery negative electrode material and a preparation method thereof. The material has a core-shell structure; a core material is silicon grains and a shell material is carbon; a gap etched by an alkaline solution is formed between the core material and the shell material, so that the volume effect of the silicon grains can be inhibited to a certain extent, the diffusion distance of lithium ions can also be reduced and the electrochemical reaction speed is enhanced; therefore, the cycle performance of the silicon-based negative electrode material is improved, the structural stability of the material in a cyclic process is improved and the aims of high capacity and high cycle are realized.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials and lithium ion batteries, and in particular relates to a lithium ion battery negative electrode material and a preparation method. Background technique [0002] In recent years, environmentally friendly renewable energy sources such as solar energy and wind energy have been greatly developed, but due to their instability, they cannot be directly integrated into the grid, and need to be converted and stored to improve reliability and utilization. Chemical power sources are one of the most promising energy storage systems. [0003] Among chemical power sources that stand out and attract a lot of attention are lithium-ion batteries. Lithium-ion batteries have the advantages of high energy density, high working voltage, long life, no memory effect and environmental friendliness. It has been recognized and affirmed in portable electronic products, space power supply and other fields...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38
CPCH01M4/13H01M4/139H01M4/366H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 潘磊李磊武沂蒙王海滨刘未未
Owner SHANGHAI JIAO TONG UNIV
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