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Hard carbon coated lithium ion battery anode material and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low carbonization rate of resin, high volatile matter, poor affinity, etc., to improve the first Coulombic efficiency and comprehensive electrical performance , Improve the effect of cycle performance

Inactive Publication Date: 2011-06-01
湖南摩根海容新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, in the modification of graphite materials, only resin-based hard carbon precursors are coated, and the bonding force with graphite materials is not good, and the degree of graphitization of hard carbon precursors is low. Although the cycle performance of the material can be improved, but for The first charge and discharge performance of the material has a great influence
Chinese patent CN101604743A uses heteroatom-doped resin polymer pyrolytic carbon to coat graphite material, which significantly improves the electrical properties of graphite, but there are also some problems, such as poor affinity between resin materials and graphite, resin heat There are many volatiles in the solution process, and the specific surface area is higher
Chinese patent CN101162775A uses resin and pitch to mix and coat graphite materials. This method also has some shortcomings in practical applications. The carbonization rate of resin is low, which affects the final first-time efficiency of materials.

Method used

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  • Hard carbon coated lithium ion battery anode material and preparation method thereof
  • Hard carbon coated lithium ion battery anode material and preparation method thereof
  • Hard carbon coated lithium ion battery anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 10g of boric acid, 33g of heat-shrinkable phenolic resin, and 67g of asphalt into a mixing mixer, mix and stir for 1 hour at room temperature, add 890g of natural graphite micropowder with an average particle size of 18 μm and a degree of graphitization ≥ 80%, and continue stirring for 2 hours. Put it into a ceramic crucible and put it into a plate kiln. Under the protection of nitrogen atmosphere, raise it to 150°C at a rate of 1.5°C / min, keep it for 2 hours, then raise it to 1100°C at a rate of 2°C / min, keep it for 4 hours, and then cool it naturally to Take out the material below 200°C, crush and sieve, then raise the temperature to 2850°C at a rate of 3°C / min under the protection of nitrogen atmosphere, keep it warm for 3 hours, cool it down to below 200°C naturally, take out the material, crush and sieve it It is the anode material of lithium ion battery.

Embodiment 2

[0020] Weigh 10g of boric acid, 25g of epoxy resin, and 75g of asphalt into the mixing mixer, mix and stir for 1.5h at room temperature, add 890g of natural graphite powder with an average particle size of 18μm and a degree of graphitization ≥ 80%, continue stirring for 2h, and pack the mixture into Put it into a ceramic crucible and put it into a plate furnace, under the protection of nitrogen atmosphere, raise it to 180°C at a rate of 3°C / min, keep it for 2h, then raise it to 1100°C at a rate of 1.5°C / min, keep it for 4h and then cool it naturally to 200°C The material is taken out below ℃, and after crushing and screening, it is the negative electrode material of lithium ion battery.

Embodiment 3

[0022] Weigh 15g of boron trioxide, 50g of heat-shrinkable phenolic resin, and 50g of asphalt into the mixing mixer, mix and stir for 2.5 hours at room temperature, add 885g of natural graphite powder with an average particle size of 18μm and a degree of graphitization ≥ 80%, and continue stirring 2h, put the mixture into a ceramic crucible and put it into a plate kiln, under the protection of nitrogen atmosphere, raise it to 160°C at a rate of 2.5°C / min, keep it for 2h, then raise it to 1080°C at a rate of 2°C / min, and keep it for 4h , and then naturally cooled to below 200°C to take out the material, crushed and sieved, then heated up to 3000°C at a rate of 2.5°C / min under the protection of nitrogen atmosphere, kept for 5 hours and then naturally cooled to below 200°C to take out the material, crushed , After sieving, it is the negative electrode material of lithium ion battery.

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Abstract

The invention discloses a hard carbon coated lithium ion battery anode material and a preparation method thereof. The anode material is characterized in that the coating material is formed by a heteroatom modifier, a hard carbon precursor material and a soft carbon precursor material, wherein the weight ratio of the heteroatom modifier to the hard carbon precursor to the soft carbon precursor is 1:(2-3.3):(3-9). The preparation method is mainly characterized by comprising the following steps: fully mixing graphite and the coating material, and then carrying out heat treatment on the mixture under the protection of inert atmosphere; preserving the temperature for 0.5-6 hours, and then cooling; and carrying out secondary high-temperature graphitization treatment under the protection of inert atmosphere. The heteroatom modifier can change the structure of the hard carbon in the coating material, and the hard carbon precursor has the characteristics of dissolvability and condensation polymerization with the soft carbon precursor asphalt, thus improving the uniformity and operability of the coated graphite particles; and the ratio of the heteroatom modifier to the hard carbon precursor to the soft carbon precursor has an important effect on the performance of the three. By optimizing the ratio of the heteroatom to the hard carbon precursor to the soft carbon precursor in the coated graphite material, the aims of increasing the capacity of the anode material and improving the cycle performance of the anode material are achieved.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material coated with hard carbon and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high specific energy, and good safety performance. They are widely used in the fields of mobile communications and laptop computer lamps, and have broad application prospects in the field of electric vehicles in the future. [0003] Graphite materials as anode materials have the advantages of low lithium intercalation / deintercalation potential, suitable reversible capacity, abundant resources, and low price, and are ideal anode materials for lithium-ion batteries. However, it also has disadvantages such as low initial discharge efficiency, poor cycle performance, and high selectivity to electrolytes, which limit the application of graphite materials and require modification of graphite materials. [0004] The method commonly ...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/1393
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 许晓落贺小红宋晓敏
Owner 湖南摩根海容新材料有限责任公司
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