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Application of Calcium Terephthalate as Lithium-ion Battery Anode Material

A calcium terephthalate, lithium-ion battery technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problem that stability and solubility have not been fundamentally improved, affecting the application process of lithium-ion batteries, modification The material capacity retention rate is low and other problems, to achieve the effect of excellent electrochemical cycle performance, low cost and slow specific capacity decay

Inactive Publication Date: 2016-02-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the effect of simple coating modification on the existing electrode materials is limited, and the stability and solubility of the electrode materials in the electrolyte have not been fundamentally improved, resulting in the low capacity retention of the modified materials and the attenuation. Obviously, it seriously affects its application process in lithium-ion batteries

Method used

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  • Application of Calcium Terephthalate as Lithium-ion Battery Anode Material
  • Application of Calcium Terephthalate as Lithium-ion Battery Anode Material
  • Application of Calcium Terephthalate as Lithium-ion Battery Anode Material

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The preparation method of calcium terephthalate comprises the following steps:

[0033] A, take by weighing 3.3226g purity and be 99% terephthalic acid C 8 h 6 o 4 Add 0.9576g of analytically pure LiOH to 100ml of deionized water, stir for 10min, ultrasonicate for 1h, and then stand in a constant temperature drying oven at 80°C for 12h to obtain a clear solution of lithium terephthalate (PTAL) with a concentration of 0.1mol / L;

[0034] B, add 2.2196g anhydrous CaCl in the lithium terephthalate solution that step A obtains 2 , stirred and ultrasonicated for 6 hours, and then stood still in a constant temperature drying oven for 12 hours at a temperature of 80°C to obtain a mixed solution containing a white precipitate of calcium terephthalate;

[0035] C. The mixed solution containing calcium terephthalate obtained in step B is centrifuged and washed 3 times with deionized water, and the solid obtained by centrifugation is placed in a thermostat and dried for 6 hours ...

Embodiment 2

[0044] The PTAC and graphite obtained in Example 1 were ball milled, wherein the mass ratio of PTAC to graphite was 100:10, deionized water was used as solvent, the time was 5 hours, the rotating speed was 400r / min, and finally dried in a vacuum oven at 110°C 6h to get the sample PTACG10. The obtained sample was subjected to the same half-cell assembly as in Example 1, and its electrochemical performance was tested. Figure 8 It is the rate performance diagram of PTACG10. It can be seen from the figure that the average discharge specific capacity when the current density is 20mA / g is 231mAh / g, which is about 80mAh / g higher than that of the pure sample, and the ratio when the current density is 243mA / g The capacity is 164mAh / g. It shows that the mixed grinding treatment with graphite can improve the electrical conductivity of the electrode material, improve its reversible capacity and rate performance.

Embodiment 3

[0046] The PTAC obtained in Example 1 was coated by CVD. In a tube furnace with two temperature zones, put urea at the inlet end, the temperature is 200°C, put the sample at the outlet end, the temperature is 400°C, and the coating time is 6h. The final sample is marked as PTACU6. The obtained sample was subjected to the same half-cell assembly as in Example 1, and its electrochemical performance was tested. Figure 9 It is the rate performance diagram of PTACU6. It can be seen from the figure that the average discharge specific capacity when the current density is 13mA / g is 210mAh / g, which is about 60mAh / g higher than that of the pure sample, and the specific capacity when the current density is 244mA / g 95mAh / g.

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Abstract

The invention provides a preparation method of calcium terephthalate, an organic negative electrode material, and its application in lithium ion batteries. The preparation method of calcium terephthalate comprises the following steps: 1) terephthalic acid reacts with LiOH or NaOH or KOH to generate terephthalate solution; 2) terephthalate solution and CaCl2 or Ca(NO3) 2 reactions to obtain a mixed solution containing calcium terephthalate; 3) separate the mixed solution, and dry the separated solid to obtain calcium terephthalate containing three waters of crystallization; 4) mix the solution containing three waters of crystallization Calcium terephthalate is dried in a vacuum drying oven to remove crystal water to obtain calcium terephthalate. The reversible specific capacity of calcium terephthalate obtained by the present invention is as high as 231mAh / g, and it has excellent stability in the electrolyte, good rate performance, slow specific capacity decay, and a capacity retention rate of up to 93% after 120 cycles of circulation, which is a performance Excellent organic anode materials for lithium-ion batteries.

Description

technical field [0001] The invention relates to a preparation method and application of an organic negative electrode material for a lithium ion battery, in particular to the preparation of a negative electrode material calcium terephthalate with good stability in electrolyte and excellent cycle performance and its application in lithium ion batteries . Background technique [0002] Materials are the necessary material basis for human production activities and life, and are closely related to human civilization and technological progress. With the continuous progress and development of society, human beings are currently facing the dual challenges of resource depletion and living environment deterioration. Therefore, various countries are working hard to promote and develop new materials, promote the concept of low-carbon life, and promote human society to move towards a sustainable development model that is energy-saving and resource-recyclable. Clean energy such as solar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C63/28C07C51/41H01M4/60
CPCC07C51/412H01M4/60H01M10/0525C07C63/28Y02E60/10
Inventor 李晶泽牟成旭黄宗令王丽平
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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