Densification of Materials AZYP-20TS Automatic Powder Tablet Press (Xiamen Tmax Battery Equipments Limited Xiamen, China) was used to densify the material with an 8 mm diameter mold. 0.5 g of sample was measured into the mold after which the sample was compressed to a briquette.The force used was 8 kN leading to 160 MPa pressure against the surface of the sample. The duration of each compression was 2 min. As a result of the densification, briquettes with average height between 7.4 mm and 8.5 mm were obtained.

For better homogenization of the composition during its mixing, ethanol was added as a solvent at the rate of 1 g of solvent per 1 g of solid substance. To eliminate clumping of carbon particles, the pre-mixed composition was placed in an ultrasonic bath (Codyson PS-40A Utrasonic Cleaner, China). After ultrasonic treatment, the composition was once again subiected to mechanical stiring for 45 min. Using the laboratory electric heat film coating machine TMAX-TMH from Xiamen Tmax Battery Equipments Limited, Xiamen, China), Figure 1a, compositions were applied to a copper or paper subtract . Preliminary drying of the composition was carried out at room temperature for 60 min. Such processing led to the hardening of the composite material. ln order to equalize the thickness and compact the working mass, the samples were passed through rolling mill (8″ width heat calendering machine from Xiamen Tmax Battery Equipments Limited, Xiamen, China), Figure 1b. The samples were cut with a round hole with a diameter of 48 mm. Successive weighing of the substrate and the manufactured sample allowed one to determine the composite mass and calculate the densitw of the ateria

coated electrode exhibited a smooth, uniform, and crack-free surface, with good adhesion to the aluminum foil (Fig. S1). The resulting electrodes and cellulose separators were then cut into diameters of 16mm and 19mm, respectively, using a CP60 die cutter punching machine (Xiamen Tmax Battery Equipments Limited). The mass loading of active material on the aluminum foil calculated by the weight difference of the electrode before (bare) and after coating was approximately 4mg. For the coin cell assembly, two electrodes with an equal mass of active materials were stacked face-to-face and separated by cellulose paper, which was soaked in a 1M Na SO, solution (Fig. S2). The coin cell was crimped using an MSK-110 hydraulic crimping machine (Xiamen Tmax Battery Equipments Limited). The specific capacitance of the cell (Cce) was calculated from the GCD discharged curves using the following equation:

Scanning Electron Microscopy The morphological properties for the sample of tensile fractured surface and TW were studied by using scanning electron microscopy (SEM) (Zeiss Supra-35VP; Carl Zeiss AG, Oberkochen, Germany). The samples from the broken tensile testing were collected and cut. The vulcanizates rubber sample and the TW were then sputter-coated (Xiamen Tmax Battery Equipments Limited, Fujian, China) with a thin layer of gold to avoid electrostatic changing and poor image resolution.