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Unsymmetrical lithia battery

A lithium-oxygen battery, asymmetric technology, applied to battery electrodes, circuits, electrical components, etc., can solve problems that have not been effectively solved, oxygen channel blockage, etc., achieve simple and feasible preparation process, smooth oxygen diffusion channel, high The effect of capacity

Active Publication Date: 2015-04-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the oxygen channel will still be blocked, and the problem has not been effectively solved

Method used

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  • Unsymmetrical lithia battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Weigh 1g lithium peroxide and 1g tricobalt tetroxide, put them into a ball mill for vacuum ball milling for 10 hours, and then add the 2 Continue vacuum ball milling for 10 hours with 4g of carbon nanotubes / g, the ball milling speed is 500r / min, and the ball-to-material ratio is 50:1. Weigh 0.4g of mixed powder, mix conductive carbon and binder at a weight ratio of 80:10:10 to make a positive electrode, and punch the pole piece into an electrode piece with a diameter of 10 mm, use graphite as the negative electrode, and the electrolyte is 1M LiTFSI / TEGDME , assembled into a CR2025 button cell in an argon-filled glove box. Such as figure 1 As shown, after the two-stage ball milling, the lithium peroxide and the catalyst were uniformly distributed on the surface of the carbon nanotubes.

Embodiment 2

[0039] Weigh 1g of lithium peroxide and 2g of manganese dioxide, put them into a ball mill for vacuum ball milling for 10 hours, and then add 2 4g of activated carbon per gram continued vacuum ball milling for 10 hours, the ball milling speed was 500r / min, and the ball-to-material ratio was 50:1. Weigh 0.4g of mixed powder, mix conductive carbon and binder at 80:10:10 to make a positive electrode, and punch the electrode sheet into an electrode sheet with a diameter of 10 mm, use graphite as the negative electrode, and the electrolyte is 1M LiTFSI / TEGDME. A CR2025 button cell was assembled in an argon-filled glove box. Such as figure 2 As shown, the initial charge and discharge capacity of the asymmetric lithium-oxygen battery reaches 5065mAh / g, which is greatly improved compared with the 1490mAh / g of the traditional lithium-oxygen battery. At the same time, if image 3 As shown, the cycle performance of the battery is significantly improved. The specific cycle retention ...

Embodiment 3

[0043] Weigh 1g of lithium peroxide and 1g of manganese dioxide, put them into a ball mill for vacuum ball milling for 10 hours, and then add 2 4g of activated carbon per gram continued vacuum ball milling for 10 hours, the ball milling speed was 500r / min, and the ball-to-material ratio was 50:1. Weigh 0.4g of the mixed powder and mix it with conductive carbon and binder at a weight ratio of 80:10:10 to make a positive electrode. The pole piece is punched into an electrode piece with a diameter of 10 mm. Lithium titanate is used as the negative electrode, and the electrolyte is 1M LiTFSI / TEGDME, assembled into CR2025 coin cells in an argon-filled glove box. After the negative electrode is changed to lithium titanate, because the lithium titanate deintercalation potential is different from that of graphite, the charging and discharging platform of the battery is changed.

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Abstract

The invention discloses an unsymmetrical lithia battery. The battery takes lithium peroxide as a positive pole active material, lithium peroxide and a catalyst which are uniformly mixed are loaded on a porous carbon material so as to form a positive pole, the material capable of realizing deintercalation of lithium ions is taken a negative pole, and the weight content of lithium peroxide is 1-50% in a composite material. According to the invention, the discharging product lithium peroxide of the traditional lithia battery is directly used as the positive pole active material, the pole material of the traditional lithium ion battery, which is capable of realizing deintercalation of lithium ions, is taken as the negative pole, the damage of negative pole lithium dendrites of a lithia battery to the battery is solved, and meanwhile, the controllable distribution of the discharging product is realized, an unblocked oxygen diffusion channel is guaranteed, and the charge-discharge capacity and cycle performance of the lithia battery are effectively improved.

Description

technical field [0001] The invention relates to an asymmetric lithium-oxygen battery, which belongs to the field of new energy. Background technique [0002] With the development of human society, problems such as energy shortage and environmental pollution have become increasingly prominent, and people's understanding and requirements for chemical power sources have become higher and higher, prompting people to continuously explore new energy storage systems based on chemical power sources. Lithium metal-based batteries have led the development of high-performance chemical power sources in recent decades. With the successful commercialization of lithium-ion batteries, countries around the world are stepping up research on lithium-ion power batteries for vehicles. However, due to factors such as energy density, safety, and price, conventional lithium-ion batteries cannot meet the requirements of electric vehicles as a power source. [0003] A lithium-oxygen battery is a ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M12/08H01M4/48H01M4/62
CPCY02E60/10
Inventor 张治安赖延清彭彬李劼卢海贾明
Owner CENT SOUTH UNIV
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