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Composite material used as lithium air battery positive electrode and preparation method thereof

A lithium-air battery and composite material technology, which is applied in battery electrodes, fuel cell-type half-cells and secondary battery-type half-cells, circuits, etc., can solve the problems of poor rechargeable performance and short service life of lithium negative electrodes, etc. To achieve the effect of reducing the charging voltage, increasing the discharge specific capacity, and increasing the contact area

Inactive Publication Date: 2012-09-12
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] About 15 years ago, Abraham et al. reported the first rechargeable non-aqueous lithium-air battery system, using a polymer electrolyte membrane (PVDF or PAN) capable of conducting lithium ions. The battery has a high specific capacity, but can be recharged Poorer performance due to shorter lifetime of lithium anode

Method used

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  • Composite material used as lithium air battery positive electrode and preparation method thereof
  • Composite material used as lithium air battery positive electrode and preparation method thereof
  • Composite material used as lithium air battery positive electrode and preparation method thereof

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preparation example Construction

[0035] The method for preparing above-mentioned composite material of the present invention, comprises the following steps:

[0036] 1) According to the mass ratio of porous carbon to sodium hydroxide is 1:6~1:8 or the mass ratio of porous carbon to nitric acid is 1:6~1:12 for material preparation, use 5~10 mol / L nitric acid solution or Activate the porous carbon with 8-10 mol / L sodium hydroxide solution, place the reacted solution in a centrifuge, pour off the supernatant, put the lower layer of black precipitate in a blast drying oven at 50-70 °C Drying for 10 to 12 h under high temperature, the porous carbon with hydrophilic groups on the surface was obtained;

[0037] 2) The molar ratio of raw materials is potassium permanganate: reducing agent: distilled water: porous carbon = 1:1:1:10~1:1:2:20, take potassium permanganate and reducing agent, add distilled water to dissolve it, Add the porous carbon containing hydrophilic groups obtained in the step 1), stir for 10-30 mi...

Embodiment 1

[0050] (1) Preparation of mesoporous carbon

[0051] Self-assembly: Take 1.22 g of phenol and put it in a round bottom flask, heat it to 40~42 °C to make it melt, add 0.26 g of 20wt%~40wt% NaOH solution, add dropwise under stirring, then stir for 10 min, 50 Add 2.10 g of formalin dropwise below °C, then raise the temperature to 75~85 °C and stir for 1 h, cool to room temperature, adjust the pH to 7 with hydrochloric acid, transfer to a rotary evaporator to remove water by vacuum evaporation, and obtain a phenolic resin. It is dissolved in ethanol to prepare 20wt%~40wt% ethanol solution of phenolic resin.

[0052] Condensation: 1.0 g polyoxyethylene-polyoxypropylene-polyoxyethylene triblock polyether (simplified molecular formula EO 106 PO 70 EO 106 , molecular weight is 12600) dissolved in 20.0 g ethanol, add 5 g 20wt%~40wt% ethanol solution of phenolic resin (under stirring, 10~30 min) to get a homogeneous solution, continue stirring for 2 h, transfer to evaporating dish, ...

Embodiment 2

[0064] (1) Adjust the pH of the phenolic resin preparation system to 4, and the reaction temperature is 75 °C. Using the phenolic resin as a carbon source, set the carbonization temperature to 650 °C to prepare mesoporous carbon.

[0065] (2) Activation of mesoporous carbon

[0066] 20 mg of mesoporous carbon was dissolved in 20 mL of 8 mol / L sodium hydroxide solution, stirred at 80 °C for 7 h, then washed with deionized water until neutral, and dried at 70 °C for 12 h.

[0067] (3) Nano α-MnO 2 / mesoporous carbon composite

[0068] Take 2 mmol KMnO 4 , 1 ml of concentrated sulfuric acid, 23 mL of deionized water, and the activated mesoporous carbon in step (2), stirred for 10 min, then placed in an oven, reacted at 140 °C for 24 h, then filtered, and then used After repeated washing with deionized water and absolute ethanol several times, and finally drying at 80 °C for 12 h, composite material 2 was obtained.

[0069] The phase and structure of the sample were determined...

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Abstract

The invention discloses a composite material used as a lithium air battery positive electrode and a preparation method thereof. The composite material comprises nanometer manganese dioxide (MnO2) and porous carbon which are compounded on the molecular level and are bonded by a hydrogen bond; and the molar ratio of the porous carbon to the nanometer MnO2 is 10:1 to 20:1. The porous carbon is uniform in aperture and large in specific surface area; the nanometer MnO2 is low in cost, non-toxic, high in average voltage and energy compatibility and extremely high in catalytic activity; and moreover, overpotential can be effectively reduced. The nanometer MnO2 used as a catalyst is deposited on the surface of the porous carbon material by a hydrothermal method or an oxidation-reduction method, so that precious metal salt is avoided, the cost is low, the practicability is high, the composite material is clean and environment-friendly, and the requirement on environment protection is met; and in addition, the method is simple and feasible, and complicated and harsh reaction conditions and side reaction are avoided.

Description

technical field [0001] The invention belongs to the field of lithium-air batteries, and in particular relates to a lithium-air battery cathode material and a preparation method thereof. Background technique [0002] In recent years, with the continuous development of the economy, it will inevitably lead to the depletion of oil resources, the aggravation of global warming and environmental pollution. The comprehensive and efficient development and utilization of new energy, environmental technology and energy-saving and emission-reduction technology has become a very necessary topic. It is imperative to research and develop power systems and materials with high energy density. The continuous new generation of battery system has become the common pursuit of scientists from all over the world. [0003] Lithium-air batteries use oxygen in the atmosphere as the positive electrode. Compared with the current lithium-ion batteries, the energy density can be increased to more than 1...

Claims

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Application Information

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IPC IPC(8): H01M4/96H01M4/90H01M4/88H01M12/08
CPCY02E60/10
Inventor 娄永兵刘艳
Owner SOUTHEAST UNIV
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