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High-voltage polymer electrolyte, high-voltage polymer lithium metal battery and preparation method of battery

A lithium metal battery and polymer technology, applied in the field of electrochemical energy storage, can solve problems such as poor contact of solid-state batteries, and achieve high energy density, improved electrochemical window, and good cycle stability.

Active Publication Date: 2020-10-16
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The third object of the present invention is to provide a method for preparing a high-voltage polymer lithium metal battery. This preparation method is simple to operate and the process is controllable, and effectively improves the problem of poor contact in solid-state batteries.

Method used

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  • High-voltage polymer electrolyte, high-voltage polymer lithium metal battery and preparation method of battery
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  • High-voltage polymer electrolyte, high-voltage polymer lithium metal battery and preparation method of battery

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preparation example Construction

[0040] The present invention also provides a preparation method for the above-mentioned high-voltage polymer lithium metal battery compound, comprising the following steps:

[0041] S1. Mix the first monomer and the second monomer evenly, and then add the lithium salt and the ionic liquid to obtain a precursor solution.

[0042] S2. Adding a thermal initiator to the precursor solution and stirring to obtain a mixed solution, and then immersing the non-woven fabric in the mixed solution to fully infiltrate it and then heating it. When cellulose non-woven fabric is used, due to the large pores of cellulose non-woven fabric, it is easy to short-circuit the positive and negative electrodes during the pressing process. , when the electrolyte is assembled with positive and negative electrodes to form a full battery, the electrolyte still has fluidity and can penetrate into the gap of the positive electrode material, thereby improving the problem of high contact resistance between th...

Embodiment 1

[0052] This embodiment provides a high-voltage polymer electrolyte and a high-voltage polymer lithium metal battery, which can be prepared according to the following steps:

[0053] First, four (ethylene glycol) diacrylate and vinylene carbonate with a molar ratio of 1:1 are mixed uniformly to obtain a polytetra(ethylene glycol) diacrylate-vinylene carbonate matrix (PVC-EGDA), and then Lithium bis(trifluorosulfonyl)imide, 1-methyl-3-butylimidazole bis(trifluoromethylsulfonyl)imide were added to the matrix of polytetra(ethylene glycol) diacrylate-vinylene carbonate[ BMI][TFSI] and LiNO 3 , to obtain the precursor solution. Wherein, the molar ratio of lithium bistrifluorosulfonyl imide to polymer monomer is 1:1. In terms of mass percent, the mass percent of 1-methyl-3-butylimidazole bis(trifluoromethylsulfonyl)imide [BMI][TFSI] in the high-voltage polymer electrolyte is 10wt.%, LiNO 3 The mass percentage in the high-voltage polymer electrolyte is 2wt.%.

[0054] After the pr...

Embodiment 2

[0057] This embodiment provides a high-voltage polymer electrolyte and a high-voltage polymer lithium metal battery, which can be prepared according to the following steps:

[0058] First, four (ethylene glycol) diacrylate and vinylene carbonate with a molar ratio of 2:1 are mixed uniformly to obtain a polytetra(ethylene glycol) diacrylate-vinylene carbonate matrix (PVC-EGDA), and then Lithium bis(trifluorosulfonyl)imide, 1-methyl-3-butylimidazole bis(trifluoromethylsulfonyl)imide were added to the matrix of polytetra(ethylene glycol) diacrylate-vinylene carbonate[ BMI][TFSI] and LiNO 3 , to obtain the precursor solution. Wherein, the molar ratio of lithium bistrifluorosulfonyl imide to polymer monomer is 1:1. In terms of mass percent, the mass percent of 1-methyl-3-butylimidazole bis(trifluoromethylsulfonyl)imide [BMI][TFSI] in the high-voltage polymer electrolyte is 10wt.%, LiNO 3 The mass percentage in the high-voltage polymer electrolyte is 2wt.%.

[0059] After the pr...

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Abstract

The invention provides a high-voltage polymer electrolyte, a high-voltage polymer lithium metal battery and a preparation method of the battery. The high-voltage polymer electrolyte comprises a polymer matrix, a non-woven fabric, a lithium salt and an ionic liquid. The polymer matrix is obtained by polymerizing a first monomer and a second monomer. The high-voltage polymer lithium metal battery comprises a cathode material, a lithium sheet and a high-voltage polymer electrolyte. In addition, the invention also relates to a preparation method of the battery. The novel high-voltage polymer electrolyte has good flexibility, excellent thermal stability, high lithium ion conductivity and high lithium ion transference number, the electrochemical window of the electrolyte is obviously improved compared with that of PEO-based polymer electrolyte, and meanwhile, the electrolyte can also keep cathode materials such as high-voltage LiCoO2 and a lithium metal anode interface stable, and shows goodcycling stability. The high-voltage polymer lithium metal battery has high energy density, long cycle life and high safety.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy storage, and in particular to a high-voltage polymer electrolyte, a high-voltage polymer lithium metal battery and a preparation method of the battery. Background technique [0002] With the rapid development of society and the extensive use of fossil fuels, the greenhouse effect of air pollution is becoming more and more serious. In addition, with the widespread use of chemical power sources in many fields such as portable electronic equipment, electric vehicles, medical treatment, military and aerospace technology, It is particularly important to develop efficient, clean and safe energy storage devices. Due to its outstanding advantages such as high energy density, low self-discharge rate, long cycle life, no memory effect, and environmental protection, secondary lithium-ion batteries are the secondary batteries with the best comprehensive performance at present, and are also key ...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525H01M10/058
CPCH01M10/0565H01M10/0525H01M10/058H01M2220/20H01M2220/30H01M2300/0085Y02P70/50
Inventor 黄令彭军宋存孙世刚
Owner XIAMEN UNIV
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