Method and application for improving discharge capacity and high rate discharge performance of hydrogen storage alloy through Co3O4 in-site compounding
A high-rate discharge, hydrogen storage alloy technology, applied in battery electrodes, circuits, nickel batteries, etc., can solve the problems of limited battery performance improvement and reduced utilization rate, and achieve the effect of improving dynamic performance and reducing internal resistance
Active Publication Date: 2016-06-15
JILIN UNIV
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However, the direct doping of Co in HSA powder 3 o 4 Powder method makes Co 3 o 4 The utilization rate of the battery is reduced, and the improvement of battery performance is limited
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[0037] The preparation process and steps in this embodiment are as follows:
[0038] (1) Melting lanthanum, cerium, yttrium, nickel, cobalt, manganese, aluminum with a purity of ≥99.5 by arc melting in a high-purity argon atmosphere to obtain ingots; anneal the ingots under an argon protective atmosphere and The powder of master alloy is obtained by mechanical grinding, and its average particle diameter is 50 μm; the alloy powder is added in the autoclave of polytetrafluoroethylene liner, and 6mMCo(NO 3 ) 2 , 2mM CTAB, 5ml ultrapure water, and 30ml ethanol are mixed evenly and added to the reaction kettle. In order to optimize the Co in the composite 3 o 4 The amount of different Co(NO 3 ) 2 Concentrations of composite materials, 9mM and 12mMCo(NO 3 ) 2 Also used in the preparation of composite materials respectively. Put the sealed reaction kettle in an electric oven at 180°C for 90 minutes, and grow Co in situ on the surface of the alloy powder. 3 o 4 . Obtained H...
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Abstract
The invention relates to a method for improving discharge capacity and high rate discharge performance of hydrogen storage alloy through Co3O4 in-site compounding. An HSAs / Co3O4 composite material is prepared through a simple hydrothermal method. The method comprises the following specific steps of a, under an argon protection condition, smelting rare earth elements and other metal elements through an electric arc furnace to obtain cast ingots of the elements; b, performing annealing and mechanical grinding on the cast ingots under the argon protection atmosphere to obtain alloy powder, wherein the average particle diameter of the alloy powder is 50[mu]m; and c, prepparing the HSAs / Co3O4 composite material through the simple hydrothermal method. Compared with the single hydrogen storage alloy, the maximum discharge capacity of the composite material obtained in the invention, used as the negative electrode of a nickel-metal hydride battery, can be increased from 302.62 mAh g<-1> to 326.37 mAh g<-1>, and the high rate discharge performance is improved as well; and the discharge capacity is increased from 40.88 mAh g<-1> to 59.01 mAh g<-1> under the discharge current of 3,000 mA g<-1>. Due to the method and the application provided by the invention, a new approach for further improving the comprehensive performance of the nickel-metal hydride battery is provided.
Description
Technical field: [0001] The invention relates to the in-situ compounding of Co on the surface of a hydrogen storage alloy 3 o 4 The preparation method and its application as the negative electrode material of nickel-metal hydride battery. Background technique: [0002] Nickel-metal hydride (Ni-MH) batteries have been widely used in portable electronic devices, electric vehicles, military equipment, etc. due to their environmental friendliness, safety, and wide temperature adaptability. However, in recent years, with the continuous development of energy storage devices, such as supercapacitors, lithium-ion batteries and fuel cells, and the increasing market demand for high-performance batteries, the energy density and power density of Ni-MH batteries need to be further improved to enhance their Competitiveness in the battery market. The electrochemical performance of NiMH batteries mainly depends on the performance of its negative electrode HSAs. Therefore, how to improve...
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IPC IPC(8): H01M4/36H01M4/38H01M4/52H01M10/30
CPCH01M4/366H01M4/383H01M4/52H01M10/30Y02E60/10
Inventor 杨春成李苗苗张冬梅荆文涛金波郎兴友蒋青
Owner JILIN UNIV