Carbon
materials with well-dispersed SnO
x
particles
exhibit excellent lithium-storage performance. However,
the volume change of SnO
x
and the weak
interaction between SnO
x
and carbon induce
an unsteady SnO
x
–C interface during
the lithiation/delithiation process. This phenomenon results in enhanced
charge transfer resistance and reduced electrical contact of active
materials, which leads to low reversibility of tin oxidation, restricted
capacity, sluggish kinetics, structural deterioration, and rapid capacity
decay. Herein, tin oxide/carbon composites with a metaphosphate-bridged
interface are synthesized to construct a robust interfacial contact
between tin oxides and carbon. The metaphosphate group functions as
a bridge between SnO
x
and carbon and results
in excellent electrochemical stability during the charge/discharge
process, which is favorable for electrode structural integrity. The
formation of the metaphosphate-bridged interface provides a steady
transport channel for e–/Li+ and thus
improves the reversibility of the conversion reaction. The enhanced
charge transfer and interaction can also boost the charge transfer
between SnO
x
and carbon, which leads to
higher SnO
x
utilization. Thus, the prepared
P-SnO
x
/C anode exhibits enhanced lithium-storage
performance in terms of specific capacity, cycling stability, and
rate performance.