During the initial five cycles, the discharge capacity of pristine G decreased slightly, similar to that of pristine H.
In comparison to the pristine Ni foil, the capacity of the activated Ni foils is greatly enhanced, yielding a remarkable discharge capacity of 0.57 mAh cm−3 with excellent rate and cycling performances.
Table 2 shows the adsorption capacity of pristine MCM-41 and functionalized MCM-41 silicas.
After coated with PMMA, both mesoporous carbons showed higher adsorption capacity than pristine materials.
During the initial five cycles measured at 44 mA g−1, the capacity of pristine H seemed to gradually decrease.
Figure 4b presents the discharge capacity of pristine G, composite GA, and GH measured at various current densities.
The discharge capacity of pristine LNMO decreased from 105 to 65 mAh g−1 after 100 cycles 1 C rate, and the capacity retention ratio was only 61.5%.
Galvanostatic charge/discharge tests denote that Li1.90Na0.10CoTi3O8 displays better cycling property and higher reversible capacity than pristine Li2CoTi3O8 and other Li2−xNaxCoTi3O8 materials.
Figure 4a presents the discharge capacity of pristine H and composites HA and HN measured at current densities of 44, 110, 220, 660, and 1320 mA g−1 in a voltage range of 4.8 2.0 V.
The grafted amount determined by thermogravimetric analysis was in good agreement with the cation exchange capacity of pristine clay, as determined by confirming that the silanes, which replaced the sodium ions, are grafted onto the clay edges.
However, the capacity of pristine SnO2 is only 320 mAh g−1 after 50 cycles, the excellent cycling performance of which could arise from good elasticity of carbon layer to accommodate the strain of volume change during cycling and improve the conductivity of this material.
