Positive electrode for lithium secondary battery, and method for producing same
A technology of lithium secondary battery and positive electrode, which is applied to the positive electrode for lithium secondary battery and its manufacturing field to achieve the effects of improving life characteristics, suppressing side reactions, and high charging/discharging efficiency
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Embodiment approach
[0052]A lithium secondary battery refers to an electrochemical device that uses a material capable of intercalating / deintercalating lithium ions as an anode and a cathode by filling an organic electrolyte or a polymer electrolyte between the anode and the cathode produced, and electricity is generated through oxidation / reduction reactions when lithium ions are intercalated / deintercalated into / from the positive and negative electrodes. According to an exemplary embodiment of the present invention, the lithium secondary battery may be a lithium-sulfur battery including "sulfur" as an electrode active material of a positive electrode.
[0053] Positive electrode for lithium secondary battery
[0054] Lithium secondary batteries have significantly higher discharge capacity and theoretical energy density than existing lithium secondary batteries, and sulfur, which is used as a positive electrode active material, has become a material for next-generation batteries because it is du...
Embodiment 1
[0123] (1) Manufacture of positive electrode
[0124] First, sulfur (average particle size: 40 μm) was heated together with carbon nanotubes (CNTs) at a temperature of 155° C. for 30 minutes to prepare a sulfur-carbon composite. The prepared composite, conductive material, and binder were mixed using a mixer to prepare a composition for forming a positive electrode active material layer in the form of a slurry. In this case, carbon black and SBR were used as the conductive material and binder, respectively. The mixing ratio was adjusted so that the sulfur-carbon compound, the conductive material, and the binder were present in a weight ratio of 88:5:7. An aluminum current collector was coated with the prepared composition for forming a positive electrode active material layer, and dried to manufacture a positive electrode.
[0125] To prepare the gel polymer precursor solution, 0.69 g of trimethylolpropane triglycidyl ether (TMPTGE ) and 0.31 g of m-xylylenediamine (m-XDA) ...
Embodiment 2
[0131] A lithium secondary battery was fabricated in the same manner as in Example 1 except for using a 10% gel polymer precursor solution.
[0132] image 3 A SEM photograph showing the surface of the positive electrode prepared in Example 2 on which the gel polymer electrolyte coating was formed.
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Abstract
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