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Carbon anode material for lithium ion battery and preparation method for carbon anode material

A technology of carbon negative electrode materials and lithium-ion batteries, which is applied in the field of materials science, can solve the problems of poor high-current charge and discharge performance, material pulverization, difficult core-shell structure, etc., and achieve low irreversible specific capacity and good charge and discharge performance. Good, good cycle stability

Inactive Publication Date: 2012-12-19
ZHEJIANG WELLY ENERGY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Natural graphite has been widely concerned because of its cost advantage, but it still has the following problems: (1) Natural graphite has a complete lamellar structure, which is easy to react with small molecules in the electrolyte to cause material pulverization, and the high degree of graphitization It will cause the SEI film formed on the surface of the negative electrode to be unstable and affect the cycle stability of the battery
(2) High current charge and discharge performance and poor performance under low temperature conditions
At present, most of the modification of natural graphite is to coat a layer of organic cracked carbon on its surface, but it is difficult to form a complete core-shell structure, and it is also difficult to meet the requirements of high-power charge and discharge and high cycle of materials at the same time.

Method used

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  • Carbon anode material for lithium ion battery and preparation method for carbon anode material
  • Carbon anode material for lithium ion battery and preparation method for carbon anode material
  • Carbon anode material for lithium ion battery and preparation method for carbon anode material

Examples

Experimental program
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Effect test

Embodiment 1

[0016] The raw material formula is as follows:

[0017] Natural graphite: 100.0g (spherical graphite, battery grade), the average particle size is 6-30μm, and the interlayer distance is d 002 0.3353~0.3354nm; organic pyrolytic carbon raw material: 4.0g petroleum pitch with a softening point of 110°C, high purity;

[0018] Solvent: 90.0g industrial grade naphthalene; carbon nanotube: 5g (battery grade, slurry, oil system 20% concentration), average diameter is 30-100nm, average length is 80-400nm,

[0019] The preparation method is as follows:

[0020] (1) Take naphthalene crystals, put them into a special sealed stainless steel beaker, heat and stir in a heat-conducting silicone oil bath at 140°C, and after it dissolves, add petroleum pitch with a high softening point, stir at 300r / min to disperse and dissolve for 5min, and then add carbon nano tube, stir and disperse for 5 minutes;

[0021] (2) Add natural graphite powder, stir and disperse for 2h;

[0022] (3) Warming up...

Embodiment 2

[0026] The difference from Example 1 is: "10.0 g of petroleum pitch with a softening point of 110° C." is used instead of "4.0 g of petroleum pitch with a softening point of 110° C.".

[0027] Other steps are with embodiment 1. The carbon negative electrode material obtained at last is denoted as A2.

Embodiment 3

[0029] The difference from Example 1 is: the first two steps of heating process in step (4) are raised from room temperature to 400°C at 5°C / min, and kept at 2h; then at 2°C / min to 600°C, kept 2h; then increase the temperature at 2°C / min to 850°C and hold the temperature for 3h" to "3°C / min heating rate from room temperature to 800°C, and keep at 800°C for 5h".

[0030] Other steps are with embodiment 1. The final carbon negative electrode material is denoted as A3.

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Abstract

The invention discloses a carbon anode material for a lithium ion battery and a preparation method for the carbon anode material. The carbon anode material comprises core-shell structured composite particles. Each core-shell structured composite particle comprises a substrate, a substrate coating layer and a carbon nano tube embedded into the substrate and the substrate coating layer. Each substrate is natural graphite. Each substrate coating layer is an organic pyrolytic carbon coating layer. The preparation method comprises the following steps of: mixing organic pyrolytic carbon coating layer raw materials and a solvent, heating and melting a mixture, and adding the carbon nano tubes to form a uniform disperse system; adding the natural graphite for mixing, and performing oil bath stirring, evaporative drying, crushing and granulation treatment; and sequentially performing small molecule removal, organic pyroytic carbon cracking and free radical-based treatment, thermal polymerization, high-temperature carbonization and micro-crystallization treatment in a non-oxidizing atmosphere. The anode material is high in first charging and discharging efficiency, cycling stability, heavy-current charging and discharging performance and low-temperature performance. Moreover, a preparation process for the anode material is simple, free of pollutant emissions and environment-friendly, totally-enclosed reaction is adopted, the solvent is recycled, and the anode material can be produced in a large scale.

Description

technical field [0001] The invention belongs to the field of materials science, and in particular relates to a lithium ion battery carbon negative electrode material, and also relates to a preparation method of the lithium ion battery carbon negative electrode material. Background of the invention [0002] Since the practical use of lithium-ion batteries in the 1990s, due to their outstanding advantages such as high voltage, high energy density, good cycle performance, small self-discharge, and no memory effect, they have been widely used in mobile terminals, digital products and portable mobile phones. Equipment, electric vehicles and energy storage power stations and other fields. However, with the birth of a new generation of equipment terminal products, it is difficult for current lithium battery materials, especially negative electrode materials, to meet their requirements for cycle performance and high-power charge and discharge performance at the same time. [0003] ...

Claims

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Application Information

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IPC IPC(8): H01M4/38
CPCY02E60/12Y02E60/10
Inventor 吴清国权学军朱玉巧徐中领张永学
Owner ZHEJIANG WELLY ENERGY CORP
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