Preparation method of conjugated carboxylate negative electrode material of lithium ion battery

A conjugated carboxylate and lithium-ion battery technology, applied in the field of electrochemistry, can solve problems such as poor conductivity, low capacity, and poor cycle stability, and achieve the effects of increasing specific energy density, increasing specific capacity, and improving electrochemical performance

Active Publication Date: 2019-12-13
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among organic anode materials, conjugated carboxylic acids have the advantages of moderate working voltage, large theoretical capacity, and long cycle life, but in practical applications, due to their poor conductivity and easy solubility in electrolyte, their capacity is low and their cycle stability is poor.

Method used

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  • Preparation method of conjugated carboxylate negative electrode material of lithium ion battery
  • Preparation method of conjugated carboxylate negative electrode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation method of a conjugated carboxylate negative electrode material for a lithium ion battery described in this embodiment specifically includes the following steps.

[0022] (1) Add 0.767g of [2,2':6',2"-terpyridine]-4,4',4"-tricarboxylic acid into 50mL of water and stir at room temperature for 1 hour to obtain a white emulsion. Another 0.2626g LiOH·H 2 O was completely dissolved in 50mL of water, slowly added to the above solution, continued to stir at 60°C for 4h, evaporated the solvent water, and dried to obtain a light yellow solid, namely [2,2':6',2"-terpyridine]-4, 4',4"-Lithium tricarboxylate.

[0023] (2) Dissolve 0.8045g of the material obtained in step (1) and 0.9167g of cobalt nitrate hexahydrate in 80mL of water, react at 60°C for 5h, filter and dry to obtain a light red solid, namely [2,2':6' ,2″-terpyridine]-4,4′,4″-cobalt tricarboxylate.

[0024] Preparation of electrodes: Mix and grind the conjugated carboxylate negative electrode material...

Embodiment 2

[0027] The preparation method of a conjugated carboxylate negative electrode material for a lithium ion battery described in this embodiment specifically includes the following steps.

[0028] (1) Add 0.767g of [2,2':6',2"-terpyridine]-4,4',4"-tricarboxylic acid into 50mL of water and stir at room temperature for 1 hour to obtain a white emulsion. Another 0.2626g LiOH·H 2 O was completely dissolved in 50mL of water, slowly added to the above solution, continued to stir at 60°C for 4h, evaporated the solvent water, and dried to obtain a light yellow solid, namely [2,2':6',2"-terpyridine]-4, 4',4"-Lithium tricarboxylate.

[0029] (2) Take 0.8045g of the material prepared in step (1) and 0.9159g of nickel nitrate hexahydrate and completely dissolve it in 80mL of water, react at 60°C for 5h, filter and dry to obtain a light green solid, namely [2,2':6' , 2″-terpyridine]-4,4′, 4″-nickel tricarboxylate, the electrode preparation method and electrochemical performance test are the ...

Embodiment 3

[0031] The preparation method of a conjugated carboxylate negative electrode material for a lithium ion battery described in this embodiment specifically includes the following steps.

[0032] (1) Add 0.767g of [2,2':6',2"-terpyridine]-4,4',4"-tricarboxylic acid into 50mL of water and stir at room temperature for 1 hour to obtain a white emulsion. Another 0.2626g LiOH·H 2 O was completely dissolved in 50mL of water, slowly added to the above solution, continued to stir at 60°C for 4h, evaporated the solvent water, and dried to obtain a light yellow solid, namely [2,2':6',2"-terpyridine]-4, 4',4"-Lithium tricarboxylate.

[0033] (2) Take 0.8045g of the material prepared in step (1) and 0.7610g of copper nitrate hexahydrate and completely dissolve it in 80mL of water, react at 60°C for 5h, filter and dry to obtain a light blue solid, namely [2,2′:6 ', 2"-terpyridine]-4,4', 4"-copper tricarboxylate, the electrode preparation method and electrochemical performance test are the s...

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Abstract

The invention discloses a preparation method of a conjugated carboxylate negative electrode material of a lithium ion battery. The method comprises the steps of enabling [2, 2': 6', 2''- terpyridine]-4, 4', 4''-tricarboxylic acid and alkali to be subjected to a neutralization reaction to synthesize [2, 2': 6', 2''- terpyridine]-4, 4', 4''-lithium tricarboxylate; reacting with nitrates corresponding to fourth periodic element metals cobalt, nickel, copper and zinc at a temperature of 60 DEG C for 5 hours to synthesize [2, 2': 6', 2''- terpyridine]-4, 4', 4''-tricarboxylate; and grinding the synthetic material, acetylene black, and polyvinylidene fluoride in N-methyl pyrrolidone, coating the mixture on a copper foil, drying the coated copper foil, cutting the dried copper foil into pieces, manufacturing button cells in a glove box, and carrying out electrochemical performance characterization. The conjugated carboxylate synthesized according to the method provided by the invention contains multiple discharge sites such as a valence-variable metal center and carboxylate radicals; the conjugated carboxylate synthesized according to the method can make good use of a synergistic lithiumstorage effect among the carboxylate, a conjugated aromatic system and variable-valence metal, and the electrochemical performance of the material is improved. It is found that the material has relatively high specific discharge capacity and excellent cycle performance through a constant current charge-discharge test.

Description

Technical field: [0001] The invention belongs to the field of electrochemistry and relates to a novel lithium ion battery negative electrode material, which has high discharge specific capacity and excellent cycle performance. In the negative electrode material, the corresponding conjugated carboxylate is synthesized by reacting the conjugated lithium carboxylate with the nitrate corresponding to the fourth period element metals cobalt, nickel, copper and zinc. [0002] Background of the invention: [0003] In recent years, energy issues and the resulting environmental issues have become the focus of our human beings. Traditional energy security issues and rising prices have also brought us challenges. The increasing energy demand and consumption of fossil fuels have led scientists around the world to try to propose Develop sustainable energy alternatives. [0004] Lithium-ion batteries have received great attention as an alternative energy source due to their high energy de...

Claims

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Application Information

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IPC IPC(8): H01M4/60H01M10/0525
CPCH01M4/60H01M10/0525H01M2004/027Y02E60/10
Inventor 刘强卞荣荣廖圣云
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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