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Low-temperature petroleum coke negative electrode material coated with nitrogenous polymer pyrolytic carbon on surface and preparation method of low-temperature petroleum coke negative electrode material

A surface coating and negative electrode material technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the complex impurity content or purity difference of industrial-grade petroleum coke element components, and the particle aggregation state and distribution difference in the chemical state of the microcrystalline surface. It is very large, restricting the industrial application of petroleum coke materials, etc., to achieve good cycle performance, environmental friendliness, and improved cycle performance.

Active Publication Date: 2017-05-17
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, due to the wide range of processing temperatures for petroleum coke treated at low and medium temperatures, the crystallinity, surface chemical state, porosity, particle aggregation state and distribution of microcrystals vary greatly, and industrial grade petroleum coke has complex elemental components, impurity content or The purity is also very different, resulting in a large difference in the first coulombic efficiency of the material in the solid electrolyte interface layer (SEI, Solid electrolyte interface), that is, the formation of the passivation film on the electrode surface.
These shortcomings seriously restrict the industrial application of petroleum coke materials as lithium-ion battery anodes, which is one of the important reasons why petroleum coke has not been widely used in the past 30 years since the commercialization of lithium-ion batteries.

Method used

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  • Low-temperature petroleum coke negative electrode material coated with nitrogenous polymer pyrolytic carbon on surface and preparation method of low-temperature petroleum coke negative electrode material
  • Low-temperature petroleum coke negative electrode material coated with nitrogenous polymer pyrolytic carbon on surface and preparation method of low-temperature petroleum coke negative electrode material
  • Low-temperature petroleum coke negative electrode material coated with nitrogenous polymer pyrolytic carbon on surface and preparation method of low-temperature petroleum coke negative electrode material

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Experimental program
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Effect test

Embodiment 1

[0041] (1) Grind industrial petroleum coke to a particle size of 0.1-1 mm, put it in a high-speed pulverizer for further crushing, pass through a 600-mesh sieve, and take the lower part of the fine powder as a raw material for use. The low-temperature petroleum coke raw materials for the experiment are the above-mentioned Fine powder, denoted as Y1;

[0042] (2) Weigh 0.5 g of polyacrylonitrile and dissolve it in 50 mL of N,N-dimethylformamide solution, add 10 g of low-temperature petroleum coke raw material (Y1) after complete dissolution, and perform vacuum rotary evaporation after magnetic stirring for 2 h , the obtained rotary evaporated solid was dried in an oven at 60 °C for 2 h, and then placed in a muffle furnace for pre-oxidation treatment at 240 °C for 2 h, and then the pre-oxidized sample was placed in a N 2 The tube furnace was sintered at 300 °C for 2 h, then raised to 700 °C for 9 h, and the sintered sample was taken out for grinding and 800-mesh sieving to obtai...

Embodiment 2

[0048] (1) First weigh 0.6 g of ammonium persulfate and dissolve it in 20 mL of deionized water, and place it in a separatory funnel for later use;

[0049] (2) Add 0.2 g of aniline liquid dropwise to 50 mL of 1.2 mol L -1 Stir in the HCl solution, then add 8 g of low-temperature petroleum coke raw materials and mix evenly. After stirring for 2 h, transfer to a 250 mL three-necked flask and reflux in an 80°C oil bath for 2 h. After cooling to room temperature, transfer to an ice-water bath. Ammonium persulfate solution was added dropwise to the mixture at a speed of 100°C, and finally the mixture was suction-filtered, washed with deionized water several times until the pH was 7, and the obtained filter residue was dried in an oven at 60 °C for 2 h and then placed in a N 2 The tube furnace was sintered at 300°C for 2 hours, then raised to 700°C for 9 hours, and the sintered samples were taken out for grinding and 800-mesh sieving to obtain a low-temperature petroleum coke negat...

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Abstract

The invention discloses a low-temperature petroleum coke negative electrode material coated with nitrogenous polymer pyrolytic carbon on the surface and a preparation method of the low-temperature petroleum coke negative electrode material. The composite negative electrode material comprises low-temperature petroleum coke as an active substance and the nitrogenous polymer pyrolytic carbon as a surface coating layer. A lithium-ion battery of using the prepared composite petroleum coke negative electrode material has the characteristics of high specific capacity, good cycle performance and the like, the specific capacity of the composite material is higher than the theoretical specific capacity of 372 mA.h.g<-1> of a graphite negative electrode material and the stable capacity can reach over 400 mA.h.g<-1>; the composite material has good cycle performance and the capacity retention ratio after 300 cycles can still be kept at about 60%-90%; and the method disclosed by the invention has the advantages of being simple in operation, low in cost, friendly to environment and high in capacity.

Description

[0001] The invention relates to a low-temperature petroleum coke negative electrode material whose surface is coated with nitrogen-containing polymer pyrolytic carbon and a preparation method thereof, belonging to the technical field of lithium ion battery negative electrode materials. Background technique [0002] Since the first commercialization by Sony Corporation in 1990, lithium-ion batteries have continued to develop rapidly for more than 30 years. At present, they have completely replaced metal-nickel-hydrogen batteries and cadmium in the 3C digital field represented by portable electrical equipment such as mobile phones and notebook computers. Nickel batteries gained popularity. The large-scale application in the field of electric vehicle power batteries and small power station energy storage batteries is still in its infancy or development stage. The two most important reasons are the safety of batteries and the performance of high rate charge and discharge. Here, th...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 马树华刘文博徐鹏远孙杨龙志李艳凯
Owner UNIV OF JINAN
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