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Method for extracting and preparing lithium ion battery negative electrode carbon material from printing and dyeing wastewater

A lithium-ion battery, printing and dyeing wastewater technology, applied in the direction of battery electrodes, secondary batteries, textile industry wastewater treatment, etc., can solve the problems of high price, high price of power battery, hindering the application and development of carbon negative electrode materials, etc., to achieve cost Low cost, significant energy and environmental protection significance, good batch stability

Pending Publication Date: 2022-04-19
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cycle life of general carbon anode materials is about 1500 times, and the specific capacity is 350-370mAh / g. However, due to mining costs and technical reasons, the price has remained high. This is also one of the reasons for the high price of power batteries, which hinders the development of carbon anode materials. Application and development of materials in battery field

Method used

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  • Method for extracting and preparing lithium ion battery negative electrode carbon material from printing and dyeing wastewater
  • Method for extracting and preparing lithium ion battery negative electrode carbon material from printing and dyeing wastewater
  • Method for extracting and preparing lithium ion battery negative electrode carbon material from printing and dyeing wastewater

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Experimental program
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Effect test

Embodiment 1

[0018] Add 0.1M hydrochloric acid solution into the printing and dyeing wastewater, adjust the pH of the solution to 6, add a flocculant, the volume ratio of the flocculant to the printing and dyeing wastewater is 1:100, after sufficient flocculation, carry out suction filtration, and put the obtained solid at 100°C Dry for 12 hours, take out and grind to obtain a carbon material precursor. The prepared precursor was put into a tube furnace, and calcined at 450° C. for 1 h in nitrogen gas. After the material was cooled, it was ground to obtain a carbon negative electrode material. Its XRD figure ( figure 2 ) shows that the material is a carbon material, containing sodium salt, and no other heterogeneous phases are found. SEM image ( image 3 ) shows that its morphology is an irregular sheet structure. The first charge and discharge diagram at room temperature ( Figure 4 ) shows that the first discharge specific capacity of the material at 0.1C in the 0-3V range is 904mAh...

Embodiment 2

[0020] Add 0.1M hydrochloric acid solution to the printing and dyeing wastewater, adjust the pH of the solution to 6, add a flocculant, the ratio of the flocculant to the printing and dyeing wastewater is 1:100, after sufficient flocculation, perform suction filtration, and put the obtained solid into an oven at 100 °C for 12 hours, taken out and ground to obtain a carbon material precursor. The prepared precursor was calcined in nitrogen at 400° C. for 1 h, and after the material was cooled, it was ground to obtain a carbon negative electrode material. Its XRD pattern shows that the material is a carbon material containing sodium salt, and no other impurity phases are found. The charge-discharge diagram shows that the carbon material has an initial discharge specific capacity of 542mAh / g at 0.1C in the 0-3V range. At room temperature, the initial cycle is the activation stage, and after 50 cycles, the capacity retention rate is 83.1%.

Embodiment 3

[0022] Add 0.1M hydrochloric acid solution to the printing and dyeing wastewater, adjust the pH of the solution to 6, add flocculant, the ratio of flocculant to printing and dyeing wastewater is 1:100, after sufficient flocculation, use vacuum pump to filter, and put the obtained solid into an oven at 100 °C for 12 hours, taken out and ground to obtain a carbon material precursor. 4.08 g of the prepared precursor was put into a tube furnace, and calcined at 350° C. for 1 h in nitrogen gas. After the material was cooled, it was ground to obtain a carbon negative electrode material. The XRD of the material shows that the material is a carbon material containing sodium salt, and no other impurity phases are found. The first charge specific capacity of the material at 0.1C under 0-3V is 306mAh / g, and the first discharge specific capacity is 622mAh / g. At room temperature, the initial cycle is the activation stage, and after 50 cycles, the capacity retention rate is 99.2%.

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Abstract

The invention relates to a carbon negative electrode material for a lithium ion battery, and belongs to the technical field of application of negative electrode materials for lithium ion batteries. The carbon material is extracted from printing and dyeing wastewater, is structurally characterized by being of an amorphous structure, and compared with a currently reported carbon negative electrode material, the material has relatively high specific capacity and relatively high economic value, the voltage range of the material is close to that of a currently used lithium ion battery material system, the material is manufactured in a large scale, the cost is low, and the manufacturing process is high in repeatability; industrial wastewater discharge is solved, the environmental problem is solved, and the method has high application value.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and in particular relates to a negative electrode carbon material for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries are a new generation of secondary batteries after lead-acid batteries, nickel-cadmium batteries and nickel-metal hydride batteries. Today, when the world is facing continuous shortage of oil resources and deteriorating environment, lithium-ion batteries have become a high-tech development due to their advantages such as high capacity, long cycle life, small self-discharge, no memory effect, no environmental pollution and good safety performance. One of the key points, it is considered to be an ideal choice for high-capacity, high-power batteries, and is an environmentally friendly power source in the 21st century. Since the commercialization of rechargeable lithium-ion batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/0525C02F1/52C02F1/66
CPCH01M4/583H01M10/0525C02F1/66C02F1/52C02F2103/30
Inventor 王晓清魏永辉吴云刘奎东李世其
Owner TIANJIN POLYTECHNIC UNIV
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