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- W2336515383 abstract "Li ion battery is challenged to increase capacity and rate capability along with durability due to the demand of higher energy density for the large-size applications. Sn based materials are very promising candidate for high efficient Li ion batteries. However, large volume change during alloying/de-alloying of Sn with Li causes pulverization and cleavage of the material arising poor cycle stability. Herein, we report the synthesis of a heterostructure of Sn-based material embedded in ordered mesoporous carbon (CMK-3). The Sn-based nanoparticles are exclusively deposited inside the nanochannels of the CMK-3 while homogeniusly coating the nano-carbon rods. We prepared SnO2/CMK-3 and by varying the subsequent annealing conditions we prepared Sn/SnO2/CMK-3 and Sn/CMK-3. Figure 1 shows the galvanostatic discharge and charge curves (a) of SnO2/Sn/CMK-3 composite, and the charge capacity (b) of the different composites at current rate of 100 mAg , as a function of cycle number, whereas, Figure 2 shows the rate capability of SnO2/Sn/CMK-3 at different currents. In terms of initial capacity, cycle stability and rate capability, SnO2/Sn/CMK-3 demonstrated the best performances which are superior to the conventional graphite. It is proposed that inclusion of metallic Sn contributes the higher initial specific capacity of 799 mAhg. Whereas, the high cycle stability and rate capability is attributed to 3-D structure of the mesoporous carbon, CMK-3. Combining the nanosize of the particles which is in order of quantum dots (about 2.5 nm), homogeneous distribution and the architecture nature of the ordered mesoporous carbon enabled Sn to undergo reversible electrochemical alloying and dealloying with Li with minimal loss of contact with the supporting nanocarbon channels. This unique ordered structure exhibits impressive initial reversible capacity of 799 mAhg. Even at as-tough-as 800 mAg the heterostructure was able to provide a stable capacity of 350 mAhg. A retention capacity of ~ 670 mAh g was obtained after 50 cycles. The lower in capacity shown for Sn/CMK-3 is attributed to agglomeration of Sn forming large particles into the CMK-3. With the remarkable rate capability and cycle stability, the SnO2/Sn/CMK-3 composite is considered as talented materials for next generation Li ion battery" @default.
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- W2336515383 date "2012-01-01" @default.
- W2336515383 modified "2023-09-24" @default.
- W2336515383 title "High Capacity Li-Ion Batteries Based on Hetero-Nanostructured SnO2-Sn/CMK-3 Materials" @default.
- W2336515383 doi "https://doi.org/10.1149/ma2012-02/10/1044" @default.
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