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Preparation method of calcium terephthalate, and application of calcium terephthalate in lithium ion battery

A technology of calcium terephthalate and terephthalic acid is applied in the field of preparation of organic negative electrode materials for lithium ion batteries, which can solve the problem that stability and solubility are not fundamentally improved, affecting the application process and modification of lithium ion batteries. 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: 2015-01-21
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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  • Preparation method of calcium terephthalate, and application of calcium terephthalate in lithium ion battery
  • Preparation method of calcium terephthalate, and application of calcium terephthalate in lithium ion battery
  • Preparation method of calcium terephthalate, and application of calcium terephthalate in lithium ion battery

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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 an organic negative material calcium terephthalate, and an application of the organic negative material calcium terephthalate in a lithium ion battery. The preparation method of calcium terephthalate comprises the following steps: 1, reacting terephthalic acid with LiOH or NaOH or KOH to obtain a terephthalate solution; 2, reacting the terephthalate salt solution with CaCl2 or Ca (NO3)2 to obtain a mixed solution containing calcium terephthalate; 3, separating the mixed solution, and drying the solid obtained separation to obtain calcium terephthalate trihydrate; and 4, drying the calcium terephthalate trihydrate in a vacuum drying box to remove crystal water in order to obtain calcium terephthalate. The calcium terephthalate has a reversible capacity of 231mAh / g, has the advantages of excellent stability in an electrolyte, good rate capability, slow specific capacity attenuation, and maintenance of high capacity of 93% after cycling for 120 weeks, and is a lithium ion battery organic negative material with excellent performances.

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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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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