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Electrochemical energy storage polymer electrolyte and preparation method thereof

A polymer and electrolyte technology, which is applied in the field of lithium-ion batteries, can solve problems such as uneven effects of external conditions, and achieve the effects of improving flame retardancy, improving ion transmission efficiency, and improving current efficiency

Pending Publication Date: 2021-12-03
SINOPEC NANJING RES INST OF CHEM IND CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to factors such as uneven external conditions and heat effects during the polymerization process, there are still challenges in the consistency and safety of this in-situ polymerized electrolyte.

Method used

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  • Electrochemical energy storage polymer electrolyte and preparation method thereof
  • Electrochemical energy storage polymer electrolyte and preparation method thereof
  • Electrochemical energy storage polymer electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] An electrochemical energy-storage polymer electrolyte and a preparation method. Ethylene carbonate and propylene glycol dipropionate are selected as polymer monomers (monomer ratio 1:1), and the monomers are dissolved in N-methylpyrrolidone at 60° C. medium; the electrolyte lithium salt LiFSI (1mol / L), ionic liquid EMImFSI (2mol / L, the structure is as follows), silicon dioxide (content 3%), dibenzamide peroxide (content 0.5%), citric acid (content 5%) was added to the aforementioned system, heated at 80 °C for 12 h; finally, the excess solvent was removed by rotary evaporation at 100 °C.

[0037] EMimFSI

[0038] The conductivity test method adopts the traditional film casting method, and then loads it into a button battery, and conducts the conductivity test with commercial lithium iron phosphate and lithium sheets as electrodes. The measured ionic conductivity at 30°C is 3.4×10 -3 .

Embodiment 2

[0040] An electrochemical energy storage polymer electrolyte and a preparation method, selecting methyl ethyl carbonate and methyl methacrylate as polymer monomers (monomer ratio 1.5:1), and dissolving the monomers in N methyl at 60° C. In pyrrolidone; the electrolyte lithium salt LiPFSI (1mol / L), the ionic liquid MMimPFSI (1.5mol / L, the structure is as follows), titanium dioxide (content 3%), azobisisobutyronitrile (content 2.5%), EDTA (content 2 %) was added to the aforementioned system, heated at 80 °C for 10 h; finally, the excess solvent was removed by rotary evaporation at 100 °C.

[0041]

[0042] The conductivity test method adopts the traditional film casting method, and then loads it into a button battery, and conducts the conductivity test with commercial lithium iron phosphate and lithium sheets as electrodes. The measured ionic conductivity at 30°C is 2.6×10 -3 .

Embodiment 3

[0044] An electrochemical energy storage polymer electrolyte and a preparation method, wherein vinylidene fluoride and hexafluoropropylene are selected as polymer monomers (monomer ratio 1:1), and the monomers are dissolved in N-methylpyrrolidone at 80°C; The electrolyte lithium salt LiPFSI (2mol / L), ionic liquid PYR13TFSI (1.5mol / L, the structure is as follows), aluminum oxide (content 5%), dimethyl azobisisobutyrate (content 1.5%), tartaric acid (content 5%) was added to the aforementioned system, heated at 90 °C for 8 h; finally, the excess solvent was removed by rotary evaporation at 100 °C.

[0045]

[0046] The conductivity test method adopts the traditional film casting method, and then puts it into a button battery, and uses commercial lithium iron phosphate pole pieces and lithium pieces as electrodes for conductivity testing. The measured ionic conductivity at 30°C was 5.2×10 -3 .

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Abstract

The invention discloses an electrochemical energy storage polymer electrolyte and a preparation method thereof. The electrolyte comprises a polymer, an electrolyte lithium salt, an ionic liquid, a solid oxide, an initiator and a chelating agent, and the polymer is good in uniformity, excellent in mechanical strength and high in ionic conductivity. According to the polymer electrolyte disclosed by the invention, the flame retardance, the thermal stability and the electrochemical stability of the polymer electrolyte are improved by adding the ionic liquid containing FSI<->, TFSI<-> and PFSI<-> anions; and the ionic conductivity is improved by adding the lithium salts LiFSI, LiTFSI and LiPFSI. The chelating agent is beneficial to relatively uniform dispersion of the ionic liquid and the lithium salt in the three-dimensional framework structure of the polymer and is beneficial to improvement of the ion transmission efficiency of the polymer electrolyte, and meanwhile, the uniformity of the system and the consistency of the prepared polymer electrolyte are also improved.

Description

technical field [0001] The invention relates to an electrochemical energy storage polymer electrolyte and a preparation method, and belongs to the technical field of lithium ion batteries. Background technique [0002] In the past two decades, with the development of technology and the further upgrade of demand, the market has given higher expectations for lithium-ion batteries with high performance, especially high safety. At present, most of the power batteries in the market are flow lithium-ion batteries, which are limited in further improving energy density and safety assurance. Because flow batteries are prone to performance degradation defects such as capacity diving and failure, and even safety accidents such as overheating and explosion, it is difficult to apply new electrode materials. Therefore, it is necessary to speed up the research and development and industrialization of new batteries. Solid-state batteries are known as next-generation batteries. The differen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/0565H01M10/0525H01M10/04C08F218/18C08F222/14C08F120/14C08F214/22C08F214/28C08F220/14C08F2/44C08K5/44C08K3/22C08K3/36
CPCH01M10/056H01M10/0565H01M10/0525H01M10/0427C08F218/24C08F222/102C08F120/14C08F214/22C08F214/28C08F222/103C08F2/44C08K5/44C08K3/22C08K3/36C08K2003/2241C08K2003/2227H01M2300/0065H01M2300/0085H01M2220/20C08F220/14Y02E60/10Y02P70/50
Inventor 张楚璠付春贾凤孔京黄伟陈琛
Owner SINOPEC NANJING RES INST OF CHEM IND CO LTD
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