Lithium secondary battery electrode comprising perforated current collector, method for manufacturing same, and lithium secondary battery comprising same
A technology for lithium secondary batteries and current collectors, applied in non-aqueous electrolyte battery electrodes, electrode manufacturing, battery electrodes, etc., can solve problems such as increasing battery energy density, slurry passing through holes, reducing thickness, etc., to reduce electrode Loss, weight reduction, and energy density improvement effects
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Embodiment 1
[0058] [Example 1] Preparation of positive electrode for lithium secondary battery using perforated current collector
[0059] First, a sulfur-carbon nanotube composite material (positive electrode active material, Cnano Technology company, China) in which sulfur and carbon nanotubes are mixed at a weight ratio of 70:30 was filled up to as high as a depression in the shape of a positive electrode. After about half of the concave part of the mold, a perforated aluminum foil current collector (Dexmet Corporation, USA) was then placed thereon, and the sulfur-carbon nanotube composite material having the same composition as the positive electrode active material described above was filled up again. . Subsequently, a pressure of 10 MPa was applied to the composite material of the positive electrode active material and the current collector filled in the mold for 5 seconds using a press (Qmesys Corporation, Korea), and the pressure-applied composite material was separated from the...
experiment example 1
[0064] [Experimental Example 1] Weight measurement and evaluation of positive electrodes
[0065] The respective weights of the positive electrodes prepared in Example 1 and Comparative Example 1 were measured and confirmed with an electronic balance. As a result, it was confirmed that the weight of the positive electrode of Comparative Example 3, which was produced by using a common metal current collector, a conductive material and a binder, reached about 15 mg / cm 2 , there is a weight difference depending on whether the current collector is perforated or not. On the other hand, the weight of the positive electrode of Example 1 in which the perforated current collector was used without using the conductive material and the binder was only about 10 mg / cm 2 . Based on the above results, it was confirmed that the change in the weight of the positive electrode was not small, depending not only on the difference in whether the perforated current collector was used or not, but...
Embodiment 2、 comparative example 3～4
[0066] [Example 2, Comparative Examples 3 to 4] Preparation of Lithium Secondary Batteries
[0067] The positive electrodes prepared in Example 1 and Comparative Examples 1 and 2 were positioned to face the negative electrode (Li metal foil), then a polyethylene separator was interposed therebetween, and then injected by dissolving LiFSI in a dimethyl ether solvent at a concentration of 1 M The prepared electrolyte is used to manufacture a lithium-sulfur battery in the form of a pouch battery with an energy of 30Wh.
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