Abstract
Abstract SnO 2 @C nanocomposites are easily synthesized in a large scale by the hydrolysis of Sn 4+ ions in a polyacrylic acid (PAA) hydrogel system, followed by the decomposition of Sn(OH) 4 and carbonization of PAA by heat treatment in one-system. The SnO 2 @C nanocomposites contain uniform ultrafine SnO 2 nanoparticles (≈4.3 nm) homogenously embedded in a three-dimensional carbon matrix. This unique structure efficiently suppresses the particle pulverization and aggregation of SnO 2 , thus maintaining the electrode integrity during long-term lithiation/delithiation process. The discharge capacity of SnO 2 @C nanocomposites is maintained at ∼597.3 mAh g −1 after 220 cycles. This scalable approach has great potential in the applications of high-capacity anodes in Li-ion batteries.
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