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Polymer electrolyte with comb-shaped structure, and all-solid-state lithium battery

A comb-like structure and polymer technology, applied in the direction of non-aqueous electrolyte battery, electrolyte battery manufacturing, electrolyte, etc., can solve the problems of burning electrode active materials, electrochemical stability needs to be improved, and potential safety hazards

Inactive Publication Date: 2018-11-23
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its high charge density and stable helium-type double electron layer make it easy to polarize other molecules or ions, so it has a very large instability
Fundamentally speaking, when lithium metal is used as the negative electrode of secondary batteries, the main problems are: (1) the low charge-discharge cycle efficiency and the continuous increase of interface impedance caused by complex interfacial reactions; (2) "dendrites" and The production of "dead lithium" brings about safety problems such as leakage, volatilization, and combustion of liquid electrolytes and loss of electrode active materials
The liquid electrolyte in traditional lithium-ion batteries has serious safety hazards due to leakage, volatilization, and combustion, and there is a wide range of chemical instability with metal lithium.
The polymer electrolyte has good film-forming properties and viscoelasticity, which makes it have good interfacial compatibility with the electrode, but the conductivity of the pure polymer electrolyte depends entirely on the movement of the chain segment to transfer lithium ions, and its conductivity is low. At the same time, the electrochemical Stability can also be improved

Method used

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  • Polymer electrolyte with comb-shaped structure, and all-solid-state lithium battery
  • Polymer electrolyte with comb-shaped structure, and all-solid-state lithium battery
  • Polymer electrolyte with comb-shaped structure, and all-solid-state lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Under the protection of an argon atmosphere, PEGDMA and LiTFSI with a molecular weight of 480g / mol were weighed according to the EO / Li molar ratio of 18:1, and stirred evenly in the dark to obtain a casting solution; the casting solution was cast in a polytetrafluoroethylene mold, and UV light with a wavelength of 200nm was irradiated for 10 minutes to obtain poly-PEGDMA480, a polymer electrolyte film material.

[0062] Using stainless steel as the blocking electrode, EIS tests were carried out at different temperatures to calculate its conductivity. The results are as follows: figure 1 shown. From figure 1 It can be seen from the figure that the ionic conductivity of this system is 3×10 at room temperature -4 S cm -1 .

[0063] Assemble the battery with stainless steel as the working electrode and lithium as the counter electrode, and conduct CV and LSV tests at 80°C to test its electrochemical window, such as figure 2 as shown, figure 2 represents the oxidatio...

Embodiment 2

[0066] Under the protection of argon atmosphere, PEGDMA and PEGDA were mixed at a molar ratio of 1:1, LiTFSI was weighed according to the EO / Li molar ratio of 18:1, stirred in ACN, and the casting solution was cast on polytetrafluoroethylene after stirring evenly. Place in a vinyl mold at room temperature protected from light for 24 hours to volatilize the solvent, and then irradiate with a 500nm wavelength ultraviolet light for 240 minutes to obtain the polymer electrolyte film material poly-PEGDMA-PEGDA.

[0067] Using stainless steel as the blocking electrode, EIS tests were carried out at different temperatures to calculate its conductivity. At room temperature, the ionic conductivity of this system is 2.5×10 -4 S cm -1 .

[0068] The battery was assembled with stainless steel as the working electrode and lithium as the counter electrode. CV and LSV tests were performed at room temperature to test its electrochemical window. The electrochemical window of this system is 0-...

Embodiment 3

[0071] Under the protection of an argon atmosphere, PEGDMA with a molecular weight of 480g / mol and PEGDMA with a molecular weight of 950g / mol were mixed at a molar ratio of 1:1, and LiTFSI was weighed according to the EO / Li molar ratio of 18:1, stirred in ACN, and then stirred After uniformity, the casting solution was cast into a polytetrafluoroethylene mold, placed in a light-proof room temperature for 24 hours to evaporate the solvent, and then irradiated with a 300nm wavelength ultraviolet light for 100 minutes to obtain a polymer electrolyte film material poly-PEGDMA-PEGDMA.

[0072] Using stainless steel as the blocking electrode, EIS tests were carried out at different temperatures to calculate its conductivity. At room temperature, the ionic conductivity of the system was 9.09×10 -4 The electrochemical window is 0-5V, and has excellent electrochemical stability.

[0073] A symmetrical battery was assembled with lithium as the electrode, and the lithium stability test w...

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Abstract

The invention provides a polymer electrolyte with a comb-shaped structure. The polymer electrolyte is prepared from a polymer monomer, a lithium salt and a solvent through drying and ultraviolet curing, wherein the polymer monomer comprises polyethylene glycol dimethacrylate with active functional groups on the single side and / or polyethylene glycol dimethacrylate with active functional groups onboth sides; and the lithium oxygen ratio EO / Li+ of the polymer monomer to the lithium salt is 5-30. By designing the polymer intrinsic structure, the molecular chain with the comb-shaped molecular structure is formed; by increasing the free moving volume of the molecular chain at normal temperature, the crystallization degree of the polymer is inhibited, the movement capability of the chain segment of the polymer is improved, and the concentration of the carrier is improved, so that the conductivity of the polymer electrolyte is improved, and stability to metal lithium is achieved. Experimental results show that the ionic conductivity in the polymer electrolyte is 2.5-9.09*10-4S cm-1, and the electrochemical window is 0-5V. The invention further provides an all-solid-state lithium battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a polymer electrolyte with a comb structure and an all-solid lithium battery. Background technique [0002] Lithium secondary batteries are widely used in daily life with many advantages such as large output power, high energy density, excellent cycle performance, no memory effect and no environmental pollution. The most competitive vehicle power battery. At present, lithium-ion batteries with graphite as the negative electrode have been widely used in various electronic products. However, the theoretical specific capacity of graphite is only 372mAh / g, and there is a large irreversible capacity loss during the first charge and discharge process, so it is difficult to become a battery with high specific energy. Anode materials for secondary batteries. With the continuous development of science and technology and the urgent need for high specific energy anode materi...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525H01M10/058
CPCH01M10/0525H01M10/0565H01M10/058H01M2300/0082H01M2300/0091Y02E60/10Y02P70/50
Inventor 陈少杰王志豪姚霞银
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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