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Preparation method of three-dimensional composite metal lithium anode all-solid-state lithium ion batteries

A lithium-ion battery and three-dimensional composite technology, applied in the field of electrochemical power sources, can solve the problems of poor conductivity interface layer, soft and low melting point physical properties of lithium metal, rapid scale application and high temperature safety problems, etc., to achieve electrode interface Stability, improved life and cycle performance, and high safety performance

Inactive Publication Date: 2018-12-04
ZIBO TORCH ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In a solid-state battery system, the use of metal lithium can increase the energy density of the battery, but most solid electrolytes are prone to react with metal lithium due to the existence of variable-valence elements to form an interface layer with extremely poor conductivity, and there is also a problem of reactivity.
In addition, the problems of volume expansion and uneven deposition still exist, and the physical characteristics of metal lithium itself, such as softness and low melting point, also bring difficulties to its rapid scale application and high temperature safety.

Method used

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  • Preparation method of three-dimensional composite metal lithium anode all-solid-state lithium ion batteries
  • Preparation method of three-dimensional composite metal lithium anode all-solid-state lithium ion batteries
  • Preparation method of three-dimensional composite metal lithium anode all-solid-state lithium ion batteries

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The difference with Comparative Example 3 is that plasticizer EC (ethylene carbonate) was added, and 800mg PMMA and 200mgPEI were weighed and dissolved in 50ml of DMF (slowly added to prevent the PMMA agglomeration from being difficult to dissolve due to too fast addition), ultrasonic After dispersing for 30 minutes, under the constant temperature condition of 85° C., magnetic heating and stirring for 20 hours, a PMMA-PEI copolymer solution was obtained. Then weigh 34mgLiPF 6 , 400mg EC and 150mg Al 2 o 3 Add it into the mixed solution, stir at room temperature for 60 min, and react with heating and stirring at a constant temperature of 50° C. for 3 h after the reactants are uniformly mixed. A milky white transparent gel-like product was obtained, and the product was uniformly coated on a PTFE plate, dried at 80° C. under vacuum for 36 hours, and then released from the mold to obtain a white all-solid-state electrolyte film with a smooth surface.

Embodiment 2

[0061] The difference with Comparative Example 3 is that plasticizer EC (ethylene carbonate) was added, and 800mg PMMA and 200mgPEI were weighed and dissolved in 50ml of DMF (slowly added to prevent the PMMA agglomeration from being difficult to dissolve due to too fast addition), ultrasonic After dispersing for 30 minutes, under the constant temperature condition of 85° C., magnetic heating and stirring for 20 hours, a PMMA-PEI copolymer solution was obtained. Then weigh 34mgLiPF 6 , 500mg EC and 150mg Al 2 o 3 Add it into the mixed solution, stir at room temperature for 60 min, and react with heating and stirring at a constant temperature of 50° C. for 3 h after the reactants are uniformly mixed. A milky white transparent gel-like product was obtained, and the product was uniformly coated on a PTFE plate, dried at 80° C. under vacuum for 36 hours, and then released from the mold to obtain a white all-solid-state electrolyte film with a smooth surface.

Embodiment 3

[0063] The difference with Comparative Example 3 is that plasticizer EC (ethylene carbonate) was added, and 800mg PMMA and 200mgPEI were weighed and dissolved in 50ml of DMF (slowly added to prevent the PMMA agglomeration from being difficult to dissolve due to too fast addition), ultrasonic After dispersing for 30 minutes, under the constant temperature condition of 85° C., magnetic heating and stirring for 20 hours, a PMMA-PEI copolymer solution was obtained. Then weigh 34mgLiPF 6 , 600mg EC and 150mg Al 2 o 3 Add it into the mixed solution, stir at room temperature for 60 min, and react with heating and stirring at a constant temperature of 50° C. for 3 h after the reactants are uniformly mixed. A milky white transparent gel-like product was obtained, and the product was uniformly coated on a PTFE plate, dried at 80° C. under vacuum for 36 hours, and then released from the mold to obtain a white all-solid-state electrolyte film with a smooth surface.

[0064] The test of...

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Abstract

The invention belongs to the technical field of electrochemistry power supply, and more specifically relates to a preparation method of a three-dimensional composite metal lithium anode all-solid-state lithium ion battery. According to the preparation method, metal lithium is loaded onto a carrier material through chemical methods including electrochemical deposition or fusion penetration or physical methods so as to obtain a three-dimensional composite metal lithium anode; the carrier material is active carbon fiber cloth; a PMMA-PEI based all-solid-state polymer electrolyte membrane is prepared, is peeled off from the surface of a polyfluortetraethylene plate, and is cut into pieces of appropriate sizes for further processing; LiFePO4 is taken as a cathode, assembling is carried out based on a cathode-PMMA-PEI based all-solid-state polymer electrolyte membrane-three-dimensional composite metal lithium anode sequence so as to obtain all-solid-state lithium ion button cells. The three-dimensional composite metal lithium anode is high in specific energy, coulombic efficiency, safety performance, is table in electrode interfaces, assembling process of the all-solid-state lithium ionbatteries is simple, and is convenient to control.

Description

technical field [0001] The invention belongs to the technical field of electrochemical power sources, and in particular relates to a method for preparing an all-solid-state lithium-ion battery with a three-dimensional composite metal lithium negative electrode. Background technique [0002] All-solid-state lithium-ion battery refers to a lithium secondary battery that uses solid materials including positive and negative electrodes and electrolyte (electrolyte solution). It is a new type of solid electrolyte material that has been developed since the 1970s. [0003] The working principle of the all-solid lithium battery is the same as that of the liquid electrolyte lithium battery. When charging, the lithium ions in the positive electrode are deintercalated from the lattice of the active material, migrate to the negative electrode through the solid electrolyte, and the electrons migrate to the negative electrode through the external circuit. The discharge process is just the ...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/62H01M4/38H01M10/0525H01M4/36
CPCH01M4/362H01M4/382H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 孙超超林双吴涛战祥连赵艳红张传乐郭辉张志鹏王晓涵
Owner ZIBO TORCH ENERGY
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