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Lithium metal cathode coated with solid polymer electrolyte and preparation method thereof

A solid polymer, lithium metal anode technology, applied in solid electrolytes, electrolyte battery manufacturing, electrolytes, etc., can solve problems such as difficult cycling, lithium dendrite growth, thermal runaway, etc., and achieve high room temperature conductivity and cycle performance. Elevate, prepare simple effects

Inactive Publication Date: 2018-09-07
HARBIN INST OF TECH WUXI RES INST OF NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, these metal lithium batteries have serious lithium dendrite growth problems, making it difficult to cycle stably.
Lithium dendrite growth can lead to a short circuit in the battery, which may cause thermal runaway, causing a potential risk of fire and explosion
These safety issues lead to the commercial application of lithium metal secondary batteries

Method used

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  • Lithium metal cathode coated with solid polymer electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Vinylene carbonate 1g, polyethylene glycol acrylate (molecular weight 1000) 9g, add 0.4g lithium trifluorosulfonate, add azobisisobutyronitrile 0.1g, stir well, inject the mixed liquid into the PTFE mold , Reaction at 70°C for 12h to obtain a solid polymer electrolyte membrane. The conductivity of the electrolyte membrane at room temperature is 5.42×10 -4 S / cm, the electrochemical stability window is 4.8V.

Embodiment 2

[0029] Vinylene carbonate 1g, polyethylene glycol acrylate (molecular weight 4000) 2g, add 0.4g lithium perchlorate, add azobisisobutyronitrile 0.01g, stir evenly, apply to metal lithium surface, react at 70°C After 12 hours, a lithium negative electrode coated with a solid polymer electrolyte membrane was obtained. Combine it with metal lithium to form a symmetrical battery at 0.05mA / cm -2 Under the current density of 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000000000000000000001000000000000000000000000000000000000000000 get cyclic test, in 200 hrs, there is no battery short circuit caused by lithium dendrites.

Embodiment 3

[0031] Vinylene carbonate 2g, polyethylene glycol acrylate (molecular weight 200) 1g, methyl methacrylate 1g, add 1g lithium bistrifluoromethanesulfonimide, add benzoyl peroxide 0.01g, stir well , coated on the surface of metallic lithium, and reacted at 80°C for 12 hours to obtain a lithium negative electrode coated with a solid polymer electrolyte membrane. It is combined with sulfur cathode to form a lithium-sulfur battery. The test results show that the Coulombic efficiency can reach 99%, and the cycle life can reach 1000 cycles.

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Abstract

The invention discloses a lithium metal cathode coated with a solid polymer electrolyte and a preparation method thereof. The lithium metal cathode coated with the solid polymer electrolyte is characterized in that metal lithium is used as a cathode, and the surface of the metal lithium is coated with the solid polymer electrolyte in an in-situ polymerizing way; the solid polymer electrolyte is apolymer of vinylene carbonate and polyethylene glycol (methyl) acrylate, or a polymer of vinylene carbonate, polyethylene glycol (methyl) acrylate and a framework monomer. The lithium metal cathode has the advantages that the preparation is simple, the room-temperature conductivity is high, the oxidizing decomposing potential is greater than 4.8V, the stability in interface with the metal lithiumis good, and the cycle property of the metal lithium battery using the metal lithium cathode coated with the electrolyte is obviously improved.

Description

technical field [0001] The invention relates to the field of lithium metal batteries, in particular to a lithium metal negative electrode coated with a solid polymer electrolyte and a preparation method thereof. Background technique [0002] With the continuous progress of society, the energy used by human beings is also increasing day by day. Efficient energy storage and conversion is the driving force of social progress, and the emergence and use of batteries enable people to use energy more efficiently and conveniently. In today's battery technology, lithium batteries have great potential. However, as the actual energy density of lithium-ion batteries (especially its graphite anode) is gradually approaching its theoretical limit, there is an urgent need for more efficient electrode materials to meet the emerging high-end storage requirements. The needs of energy device development. The lithium metal anode is characterized by its extremely high theoretical capacity (3860...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395H01M10/0565H01M10/058H01M10/052H01M10/056
CPCH01M4/134H01M4/1395H01M10/052H01M10/056H01M10/0565H01M10/058H01M2300/0065H01M2300/0082H01M2300/0091Y02E60/10Y02P70/50
Inventor 白永平赵彦彪安茂忠陈国荣白杨李卫东殷晓芬
Owner HARBIN INST OF TECH WUXI RES INST OF NEW MATERIALS
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