Electrode for secondary battery and secondary battery
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Example
Measurement Example 1: Method for Measuring Shape of Conductive Material Portion
[0163]The voids of the electrodes obtained in Examples and Comparative Examples were filled with an epoxy resin. After that, the electrode cross section was cut out using an ion milling apparatus (IM4000 manufactured by Hitachi High-Tech Corporation). The spreading resistance value in the electrode cross section was measured by scanning spreading resistance microscopy. After that, the total data number of spreading resistance values N (1024 columns×918 rows in the case of Example 1) attained by removing the current collecting foil data from the acquired spreading resistance value data of 1024 columns×1024 rows were sorted in ascending order using Excel, and then the 0.1Nth spreading resistance value (rounded down to the nearest decimal point) was taken as R. Binarization processing was performed on all the two-dimensional data using 0.7R as a threshold value. A pixel value indicating a resistance value of 0
Example
Measurement Example 2: Battery Performance Evaluation
[0166]With regard to the rate characteristics and cycle characteristics, a working electrode was fabricated by punching the electrode plate fabricated in each of Examples and Comparative Examples using a punch of φ16.1 mm. As a counter electrode, 98 parts by weight of graphite (manufactured by Ito Graphite Co., Ltd., Model Number SG-BH8, particle size 8 μm), 1 part by weight of 1% aqueous solution of sodium carboxymethyl cellulose (manufactured by Daicel Miraizu Ltd., Model Number #2200) in terms of solid content, 1 part by weight of 1% aqueous dispersion of SBR (manufactured by JSR Corporation, Model Number TRD2001) in terms of solid content, and ion-exchanged water were added so that the solid concentration in the entire electrode paste was 50%, and mixing was performed at a rotational speed of 30 RPM for 30 minutes using a planetary mixer to obtain an electrode paste. This electrode paste was applied to a copper foil (thickness: 1
Example
Synthesis Example 3: Method for Preparing Graphene NMP Dispersion 2
[0170]The graphene oxide gel prepared in Synthesis Example 1 was diluted with ion-exchanged water to 5 mg / ml and treated using an ultrasonic cleaning machine for 30 minutes, then 0.3 g of sodium dithionite was added to 20 ml of the diluted dispersion, and the reduction reaction was performed at 40° C. for 1 hour. After that, the resultant dispersion was filtered through a vacuum suction filter, and the filtered product was further diluted with water to 0.7% by mass and freeze-dried to obtain graphene powder. NMP was added to the graphene powder, the concentration of the dispersion was adjusted to 2.0% by mass, and the treatment was performed at a rotational speed of 20 RPM for 30 minutes using a planetary mixer to obtain a graphene NMP dispersion (2.0% by mass).
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