Sodium secondary battery including graphite felt as current collector
A sodium secondary battery and graphite felt technology, applied in the field of sodium secondary batteries, can solve the problems of low power and poor competitiveness, achieve large reaction area, prevent the increase of internal resistance, and prevent the effect of capacity reduction
Active Publication Date: 2015-01-21
SK INNOVATION CO LTD
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Problems solved by technology
[0004] However, conventional sodium-based batteries such as sodium-sulfur batteries or sodium-nickel chloride batteries need to operate at a minimum temperature of 250°C or higher in consideration of conductivity and melting of battery structures. , Sodium-sulfur batteries have the disadvantage of having a minimum operating temperature above 300°C
Due to this problem, in order to maintain temperature, maintain airtightness, and enhance safety, there are many unfavorable factors on the economic side in terms of manufacturing or operation
In order to solve the above-mentioned problems, sodium-based batteries of the room temperature type are being developed, but the power of these batteries is very low, and they are not competitive with nickel-hydrogen batteries or lithium batteries.
Method used
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[0029] Referring to the drawings, the sodium secondary battery of the present invention will be described in detail. The drawings described below are examples provided to fully convey the idea of the present invention to those skilled in the art to which the present invention pertains. Therefore, the present invention is not limited to the drawings given below but can be embodied in other forms, and the drawings given below are exaggerated in order to clarify the idea of the present invention. And throughout the specification, the same reference numerals denote the same structural elements.
[0030] Wherein, the technical terms and scientific terms used have the meanings commonly understood by those of ordinary skill in the art to which the present invention belongs without other definitions, and in the following descriptions and drawings, descriptions of known functions or structures will be unnecessary If the gist of the present invention is obscured, its detailed descr...
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Abstract
Provided is a sodium secondary battery including a graphite felt having a maximum porosity on a surface facing a solid electrolyte and a decreased porosity in a thickness direction, as a cathode current collector impregnated with an electrolyte.
Description
technical field [0001] The present invention relates to a sodium secondary battery, in particular to a sodium secondary battery comprising graphite felt as an anode current collector. Background technique [0002] As the utilization of new and renewable energy is rapidly increasing, the necessity of energy storage devices utilizing batteries is rapidly increasing. Such batteries can utilize lead batteries, nickel / hydrogen batteries, vanadium batteries, and lithium batteries. However, the energy density of lead batteries and nickel / hydrogen batteries is too small and there is a problem that more space is required to store energy of the same capacity. In addition, in the case of a vanadium battery, due to the use of a solution containing heavy metals, environmental pollutants and a small amount of substances between the cathode and anode move through the separator that separates the cathode and anode, thereby deteriorating the performance of the battery and cannot be promoted...
Claims
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IPC IPC(8): H01M4/66H01M10/39
CPCH01M4/70H01M10/054H01M10/0568H01M4/663H01M10/0422H01M2004/021H01M10/39H01M4/131Y02E60/10Y02P70/50H01M4/66H01M10/38
Inventor 金荣率郑求峰金正洙
Owner SK INNOVATION CO LTD