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An air positive electrode composed of conductive gel particles and its lithium-air battery

A lithium-air battery, air cathode technology, applied in electrical components, battery electrodes, fuel cell type half cells and primary battery type half cells, etc., can solve the difficulty of oxygen diffusion and the small thickness of the air cathode can not meet the practical application requirements and other problems to achieve the effect of increasing the discharge specific capacity

Active Publication Date: 2016-05-25
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the above defects or improvement needs of the prior art, the present invention provides an air positive electrode composed of conductive gel particles and a lithium-air battery thereof, the purpose of which is to provide a lithium-air battery with excellent performance prepared by using conductive gel particles For air positive electrodes and lithium-air batteries, the conductive gel is all solid and granular, and has certain elasticity and mechanical strength. Although the gel particles themselves do not contain micropores, the micron-scale gaps between the particles can accommodate gas as oxygen. The fast path of diffusion makes the battery react quickly and will not stop, thus solving the current series of technologies that the thickness of the air positive electrode is too small to meet the practical application requirements, the difficulty of oxygen diffusion may stop the battery reaction, or the slow diffusion of oxygen limits the rapid progress of the battery reaction question

Method used

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  • An air positive electrode composed of conductive gel particles and its lithium-air battery
  • An air positive electrode composed of conductive gel particles and its lithium-air battery
  • An air positive electrode composed of conductive gel particles and its lithium-air battery

Examples

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Embodiment 1

[0039] This example prepares carbon nanotube (CNT) / vinylidene fluoride hexafluoropropylene copolymer (PVDF-HFP) / tetraethylene glycol dimethyl ether (TEGDME) / lithium bistrifluorosulfonimide (LiTFSI) Conductive gel particles. The conductive gel particles in this example were prepared into an air positive electrode and assembled into a button-type lithium-air battery to test the performance of the air positive electrode.

[0040] In the conductive gel, CNT is used as a conductive filler, PVDF-HFP is used as a gel-forming skeleton polymer, TEGDME is used as an organic solvent, and LiTFSI is used as a lithium salt.

[0041] The preparation process of the conductive gel particles is as follows: (1) using CVD-grown sponge-like carbon nanotubes (CNT sponges) with a density of about 10 mg / mL as an electronically conductive framework. (2) Heat and dissolve the polymer PVDF-HFP in acetonitrile to form a concentration of 50mgmL -1 (3) immerse the CNT sponge in step (1) in the polymer so...

Embodiment 2

[0049] This embodiment prepares palladium (Pd) / carbon nanotube (CNT) / polyethylene oxide (PEO) / tetraethylene glycol dimethyl ether (TEGDME) / bistrifluoromethylsulfonylimide lithium (LiTFSI) composition Conductive gel particles. The conductive gel particles in this example were prepared into an air positive electrode and assembled into a button-type lithium-air battery, and the performance of the air positive electrode was tested.

[0050] In the conductive gel, Pd nanoparticles are used as a catalyst for oxygen reduction reaction and oxygen evolution reaction, CNT is used as a conductive filler, PEO is used as a gel-forming skeleton polymer, TEGDME is an organic solvent, and LiTFSI is used as a lithium salt.

[0051] Compared with Example 1, on the basis of Example 1, this example loaded some Pd nanoparticles on the surface of CNT, and replaced the skeleton polymer in the gel. The specific implementation method is as follows: (1) The sponge-like carbon nanotube (CNT sponge) gro...

Embodiment 3

[0054] This embodiment prepares manganese oxide (MnO 2 ) / Ketjen black (KB) / polyvinylidene fluoride (PVDF) / tetraethylene glycol dimethyl ether (TEGDME) / lithium tetrafluoroborate (LiBF 4 ) composed of conductive gel. The conductive gel particles in this example were prepared into an air positive electrode and assembled into a button-type lithium-air battery, and the performance of the air positive electrode was tested.

[0055] In this conductive gel, MnO 2 Nanoparticles as catalyst for oxygen reduction reaction, KB as conductive filler, PVDF as backbone polymer for gel formation, TEGDME as organic solvent, LiBF 4 as a lithium salt.

[0056] The preparation process of the conductive gel particle is as follows: (1) KB is used as the electronic conductive framework. (2) Heat and dissolve the polymer PVDF in 1mol / L LiBF 4 / TEGDME organic electrolyte, the formation concentration is 50mg·mL -1 (3) Add KB to the polymer solution obtained in step (2), heat to 120°C under the prot...

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Abstract

The invention discloses an air positive electrode constructed by conductive gel particles and a lithium air battery. The air positive electrode is characterized by being of a full-solid structure and comprising particles with arbitrary shapes, wherein the particles are prepared from conductive gel, gaps are formed among the particles, electrons and ions can be simultaneously conducted by conductive gel, and the size range of the particle sizes of the particles is 10-500 microns; the particles are stacked to form a laminated structure, and the thickness of the laminated structure is 50 microns to 5 millimeters. A battery cell of the lithium air battery is of a multi-layer winding type structure or a multi-layer laminating type structure and is formed by winding and laminating a plurality of repetitive units, and each repetitive unit comprises the air positive electrode. A rapid gas dispersion channel is formed in the air positive electrode and can be prepared to be relatively thick, so that the problem that oxygen is difficult to diffuse is effectively solved, and the air positive electrode can be truly input into actual application.

Description

technical field [0001] The invention belongs to the field of batteries, and more specifically relates to an air positive electrode composed of conductive gel particles and a lithium-air battery comprising the air positive electrode. Background technique [0002] With the rapid development of the global economy, the demand for energy storage technology is increasing day by day. Traditional lithium-ion batteries are limited by the energy density of positive electrode materials, and it is difficult to meet the high energy density requirements of electric vehicles. There is an urgent need to develop a battery system with higher energy density. Lithium-air batteries are high-energy-density batteries that use metallic lithium as the negative electrode and oxygen as the air positive electrode. Since the active material of the air positive electrode can be directly obtained from the environment without being stored inside the battery, its theoretical energy density can be as high a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M12/06
Inventor 沈越尹微黄云辉
Owner HUAZHONG UNIV OF SCI & TECH
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