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Needle coke regulated and controlled by transition metal as well as preparation and application of needle coke

A transition metal and transition metal salt technology, which is applied in the preparation/purification of carbon, structural parts, electrical components, etc., can solve the problems of reduced cycle capacity of electrode materials, increase of carbon materials, and reduced material conductivity, etc., to achieve excellent rate performance and cycle stability, improve the deintercalation process, and increase the effect of active sites

Pending Publication Date: 2022-07-08
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the inventive method is simple in process and can convert needle coke-based carbon materials into electrode materials for supercapacitors with higher added value, it has the disadvantage that two heat treatments are required, and the treatment process is relatively complicated, and the second During heat treatment, the temperature reaches 600~950°C, and a large number of pore structures are produced in the intermediate product, which leads to an increase in the disorder of the carbon material and reduces the conductivity of the material.
In addition, when carbon materials treated with ordinary metals are applied to lithium-ion batteries or capacitors, the electronic conductivity is poor, and the power density is low, which limits the specific capacitance. Severe metal agglomeration causes the material to deform, resulting in a decrease in the cycle capacity of the electrode material, which is very unfavorable for the long-term and large-scale use of electronic devices

Method used

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  • Needle coke regulated and controlled by transition metal as well as preparation and application of needle coke
  • Needle coke regulated and controlled by transition metal as well as preparation and application of needle coke
  • Needle coke regulated and controlled by transition metal as well as preparation and application of needle coke

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The industrial-grade needle coke is passed through a mixture of hydrofluoric acid and concentrated hydrochloric acid with a volume ratio of 1:4, and then the ash and other impurities contained therein are removed to obtain pure needle coke. The specific work is 2 g needles. The coke was placed in 200 mL with a volume ratio of 75% H 2 O 2 In the reaction process, the reaction was stirred in a water bath at a temperature of 50 °C for 6 h, followed by suction filtration and drying at 60 °C for 12 h under vacuum conditions to obtain the activated needle coke.

[0031] 0.5 g of the activated needle coke obtained in the previous step and 1 g of powdered Fe(NO 3 ) 3 9H 2 O was placed in 80 mL of deionized water, stirred for 1 h and sonicated for 2 h, then the homogeneous mixture was put into a 100 mL stainless steel hydrothermal kettle, and the temperature was set at 180 °C and maintained for 12 h. After the reaction, suction filtration and Placed in a vacuum drying oven ...

Embodiment 2

[0034] The industrial-grade needle coke is passed through a mixture of hydrofluoric acid and concentrated hydrochloric acid with a volume ratio of 1:3, and then the ash and other impurities contained therein are removed to obtain pure needle coke. The specific work is 1 g needle. The coke was placed in 120 mL with a volume ratio of 75% H 2 O 2 In the reaction process, the reaction was stirred in a water bath at a temperature of 50 °C for 6 h, followed by suction filtration and drying at 60 °C for 12 h under vacuum conditions to obtain the activated needle coke.

[0035] 0.25 g needle coke and 0.25 g powder Fe(NO 3 ) 3 9H 2 O was placed in 80 mL of deionized water, stirred for 1 h and sonicated for 2 h, then the homogeneous mixture was put into a 100 mL stainless steel hydrothermal kettle, and the temperature was set at 180 °C and maintained for 12 h. After the reaction, suction filtration and Placed in a vacuum drying oven at 60 °C for drying; then the dried mixture was c...

Embodiment 3

[0038] The industrial-grade needle coke is passed through a mixture of hydrofluoric acid and concentrated hydrochloric acid with a volume ratio of 1:3, and then the ash and other impurities contained therein are removed to obtain pure needle coke. The specific work is 1 g needle. The coke was placed in 160 mL with a volume ratio of 75% H 2 O 2 In the reaction process, the reaction was stirred in a water bath at a temperature of 50 °C for 6 h, followed by suction filtration and drying at 60 °C for 12 h under vacuum conditions to obtain the activated needle coke.

[0039] 0.5 g of activated needle coke and 1.2 g of powdered Co(NO 3 ) 3 6H 2 O was placed in 80 mL of deionized water, stirred for 1 h and sonicated for 2 h, then the homogeneous mixture was put into a 100 mL stainless steel hydrothermal kettle, and the temperature was set at 180 °C and maintained for 12 h. After the reaction, suction filtration and The dried mixture was calcined in a tube furnace at 500°C and fi...

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Abstract

The invention discloses a preparation method of transition metal regulated and controlled needle coke and application of the transition metal regulated and controlled needle coke in a lithium ion battery, the transition metal regulated and controlled needle coke is prepared by the following steps: by taking coal-based needle coke as a substrate, activating the coal-based needle coke, performing hydrothermal mixing treatment on the activated coal-based needle coke and transition metal salt, and performing simple roasting to modify the surface by metal, thereby obtaining the transition metal regulated and controlled needle coke. And metal on the surface is removed through low-concentration acid pickling to obtain the high-performance electrode material. The method disclosed by the invention is simple in preparation process, safe, effective and short in operation time, shows excellent cycle performance and rate charge-discharge performance as a lithium ion battery negative electrode material, and has a wide application prospect in the field of energy storage.

Description

technical field [0001] The present invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular, to a method for preparing needle coke regulated by transition metals for negative electrodes of lithium ion batteries. Background technique [0002] Fossil fuels are widely used energy resources in the world, but a series of problems such as resource depletion of fossil fuels, environmental pollution, and political turmoil limit its development. Lithium-ion battery technology is an important green, high-efficiency and energy-saving energy storage method, and has received extensive attention due to its excellent electrochemical performance and many advantages. Li-ion batteries are widely used in portable electronics, electric vehicles, and grid-scale smart energy storage systems. As a result, the requirements for battery capacity, density, cycling, and stability continue to increase. In the composition of lithium-ion batteries,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587C01B32/05H01M4/133H01M10/0525
CPCH01M4/587C01B32/05H01M10/0525H01M4/133H01M2004/027Y02E60/10
Inventor 赵翰庆畅高博李忠
Owner TAIYUAN UNIV OF TECH
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