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Ionic liquid additive capable of promoting film formation of graphite cathode of lithium ion battery

A lithium-ion battery and ionic liquid technology, applied in the field of ionic liquid additives, can solve problems such as inability to eliminate flammability, difficult application, affecting battery safety and cycle performance, etc.

Inactive Publication Date: 2012-12-12
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently commonly used organic additives mainly include vinylidene-containing organic unsaturated compounds such as vinylene carbonate (VC), sulfites (propylene sulfite PS), halogenated organic esters, organic borides, etc., but organic additives High price and cannot eliminate flammability
The types and quantities of inorganic additives are limited, basically limited to additives such as sulfur dioxide and carbon dioxide. Due to the low solubility of gas additives in the electrolyte, a large amount of gas is generated during charging and discharging, which will cause battery swelling and affect the safety and cycle performance of the battery. difficulty

Method used

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  • Ionic liquid additive capable of promoting film formation of graphite cathode of lithium ion battery
  • Ionic liquid additive capable of promoting film formation of graphite cathode of lithium ion battery
  • Ionic liquid additive capable of promoting film formation of graphite cathode of lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Mix ethylene carbonate (EC), dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC) in a weight ratio of 1:1:1 to form a mixed solvent. Based on weight, take 99 parts of the mixed solvent, add 1 part of the present invention additive 1-phenyl-2-allyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide salt, the added LiPF 6 , based on the total volume of the electrolyte solvent, it was prepared as a 1M electrolyte.

[0015] The electrolyte is prepared in a glove box (water and oxygen content are both less than 1ppm), and ethylene carbonate (EC), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC) and 1-phenyl-2-ene Propyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide salt is mixed well, and finally LiPF is added 6 , making it a 1M solution to prepare the electrolyte solution of the present invention.

[0016] Based on the weight of the electrolyte, the composition of the additive is: 1-phenyl-2-allyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imid...

Embodiment 2

[0018] Mix ethylene carbonate (EC), dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC) in a weight ratio of 1:1:1 to form a mixed solvent. Based on weight, take 97 parts of the mixed solvent, add 3 parts of the additive 1-phenyl-2-allyl-3-methylimidazole bis(trifluoromethylsulfonyl)imide salt of the present invention, the added LiPF 6 , based on the total volume of the electrolyte solvent, it was prepared as a 1M electrolyte.

[0019] The electrolyte is prepared in a glove box (water and oxygen content are both less than 1ppm), and ethylene carbonate (EC), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC) and 1-phenyl-2-ene Propyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide salt is mixed well, and finally LiPF is added 6 , making it a 1M solution to prepare the electrolyte solution of the present invention.

[0020] Based on the weight of the electrolyte, the composition of the additive is: 1-phenyl-2-allyl-3-methylimidazolium bis(trifluoromethylsulfony...

Embodiment 3

[0022] Mix ethylene carbonate (EC), dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC) in a weight ratio of 1:1:1 to form a mixed solvent. Based on weight, take 95 parts of the mixed solvent, add 5 parts of the additive 1-phenyl-2-allyl-3-methylimidazole bis(trifluoromethylsulfonyl)imide salt of the present invention, the added LiPF 6 , based on the total volume of the electrolyte solvent, it was prepared as a 1M electrolyte.

[0023] The electrolyte is prepared in a glove box (both water and oxygen content are less than 1ppm), and ethylene carbonate (EC), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC) and 1-phenyl 2-allyl Base-3-methylimidazolium bis(trifluoromethylsulfonyl)imide salt, mix well, and finally add LiPF 6 , making it a 1M solution to prepare the electrolyte solution of the present invention.

[0024] Based on the weight of the electrolyte, the composition of the additive is: 1-phenyl-2-allyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide s...

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Abstract

The invention relates to an ionic liquid additive capable of promoting film formation of a graphite cathode of a lithium ion battery. The ionic liquid additive can effectively improve cycle performance and safety performance of the lithium ion battery. The ionic liquid additive for electrolyte of the lithium ion battery is a series of monosubstituted, disubstituted or trisubstituted imidazole ionic liquid. When charging and discharging at 0.1 C rate, the battery composed of the electrolyte containing the ionic liquid has a discharge capacity retention rate of 85% after 80 cycles, and charging and discharging efficiency basically maintains to be more than 98%. Addition of the ionic liquid both ensures cycle performance of the lithium ion battery and improves security of the lithium ion battery, and has a high market promotion value.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries and relates to an ionic liquid additive for promoting the film formation of graphite negative electrodes. technical background [0002] Lithium-ion batteries are green, high-energy and environmentally friendly batteries that appeared in the 1990s. Due to their advantages such as high voltage, small size, light weight, high specific energy, no memory effect, no pollution, small self-discharge, and long life, they are widely used in mobile phones. , notebook computers, camcorders, digital cameras and other portable electronic products that emphasize thinness, shortness, and multi-function are rapidly popularized. At present, lithium-ion batteries are entering a larger industry group - the field of automotive power batteries by virtue of their own comprehensive advantages. The electrolyte is called the "blood" of lithium-ion batteries and is an important part of the battery. It has an important ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567
CPCY02E60/12Y02E60/10
Inventor 张锁江王中妮蔡迎军吕兴梅汪志华
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI