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Lithium ion battery cathode film-forming electrolyte compound salt and method for preparing function electrolyte

A lithium-ion battery and negative electrode film forming technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve the problems such as the addition amount cannot be too high, large irreversible capacity, cycle performance decline, etc., to reduce a large amount of consumption, reduced structural damage, improved compatibility

Inactive Publication Date: 2008-08-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] So far, these methods have focused on improving the solvent, and the addition amount should not be too high. When the PC content is high, a large irreversible capacity will be generated during the first cycle, resulting in a significant decrease in efficiency and cycle performance.

Method used

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  • Lithium ion battery cathode film-forming electrolyte compound salt and method for preparing function electrolyte
  • Lithium ion battery cathode film-forming electrolyte compound salt and method for preparing function electrolyte
  • Lithium ion battery cathode film-forming electrolyte compound salt and method for preparing function electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In the first step, under the condition of 15°C, first use a rotary evaporator to distill and purify the cyclic carbonate solvent PC, EC and the linear carbonate solvent DMC respectively to remove traces of water inside, and then use 4A molecular sieves at 30°C and 40°C respectively. Under the conditions of ℃ and 30℃, the deep adsorption of trace water is carried out. This operation is repeated three times until the impurity and water content are less than 0.005%. Then PC, EC, and DMC were mixed with ternary solvents, and a certain amount of PC, EC, and DMC were weighed with a microanalytical electronic balance, wherein the mass ratio of the three was 1:1:3, and 10ml was measured with a graduated cylinder (15ml). Pour the mixed electrolyte into the grinding bottle. All processes of electrolyte preparation are carried out in a glove box filled with high-purity argon;

[0030] The second step is to weigh 1.519g LiPF with a microanalytical electronic balance in the glove ...

Embodiment 2

[0034] In the first step, under the condition of 15°C, first use a rotary evaporator to distill and purify the cyclic carbonate solvent PC, EC and the linear carbonate solvent DMC respectively to remove traces of water inside, and then use 4A molecular sieves at 30°C and 40°C respectively. Under the conditions of ℃ and 30℃, the deep adsorption of trace water is carried out. This operation is repeated three times until the impurity and water content are less than 0.005%. Then PC, EC, and DMC were mixed with ternary solvents, and a certain amount of PC, EC, and DMC were weighed with a microanalytical electronic balance, wherein the mass ratio of the three was 1:1:3, and 10ml was measured with a graduated cylinder (15ml). Pour the mixed electrolyte into the grinding bottle. All processes of electrolyte preparation are carried out in a glove box filled with high-purity argon;

[0035] The second step is to weigh 1.519g LiPF with a Mettler microanalytical electronic balance in th...

Embodiment 3

[0039] In the first step, under the condition of 25°C, first use a rotary evaporator to distill and purify the cyclic carbonate solvents PC and EC and the linear carbonate solvent DEC to remove traces of water inside, and then use 4A molecular sieves at 30°C and 40°C respectively. Under the conditions of ℃ and 30℃, the deep adsorption of trace water is carried out. This operation is repeated three times until the impurity and water content are less than 0.005%. Then PC, EC, and DEC were mixed with ternary solvents, and a certain amount of PC, EC, and DEC were weighed with a microanalytical electronic balance, wherein the mass ratio of the three was 2:1:2.5, and 10ml was measured with a graduated cylinder (15ml). Pour the mixed electrolyte into the grinding bottle. All processes of electrolyte preparation are carried out in a glove box filled with high-purity argon;

[0040] The second step is to weigh 1.125g LiBF with Mettler microanalytical electronic balance in the glove b...

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Abstract

The invention provides a method for preparing cathode film forming electrolyte compound salt and a functional electrolyte of a lithium-ion cell, comprising the following steps and technology conditions: mixing a purified and dehydrated cyclic carbonic ester solvent and a linear carbonic ester solvent dually or multiply, wherein the mass ratio between the cyclic carbonic ester solvent and the linear carbonic ester solvent is between 1:1 to 1:3, the content of the carbonic ally ester is not less than ten percent. Under indoor temperature, dissolving conductive lithium salt in the solvent to make electrolyte; adding the cathode film forming electrolyte salt R4NBF4 in the electrolyte with the concentration not less than zero point one mol / L. The lithium-ion cell electrolyte prepared by the method can improve PC content in the electrolyte, restrain the embedment damage affect on a graphite cathode by the PC solvent and improve the initial reversible capacity of the cell so as to promote the compatibility between the PC-based electrolyte and the graphic anode material and the cyclic life of cells.

Description

technical field [0001] The invention relates to a lithium ion battery electrolyte, in particular to a novel lithium ion battery negative electrode film-forming electrolyte composite salt and a preparation method for a functional electrolyte thereof. Background technique [0002] Lithium-ion batteries have become a hot spot in new energy research due to their advantages such as high working voltage, high energy density, and low environmental pollution. With the continuous deepening of the marketization of lithium-ion batteries, people's expectations for lithium-ion batteries are getting higher and higher. Currently commercialized lithium-ion batteries are difficult to meet the needs of practical applications, such as electric vehicles, aerospace technology, and military fields. The ionic conductivity of the electrolyte and the formation of the SEI film are closely related to the choice of solvent. Therefore, it is of great significance to study the composition and ratio of ...

Claims

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Application Information

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IPC IPC(8): H01M10/40C07C69/96H01M10/0567H01M10/0569H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 赖延清张治安李凡群李劼高宏权杨娟郝新刘业翔
Owner CENT SOUTH UNIV
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