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Highlights
Heterostructure engineering is proposed to construct CoTe
2
/ZnTe heterostructures with built-in electric field.
Conductive and elastic Ti
3
C
2
T
x
MXene is introduced to improve the conductivity and alleviate the volume change of CoTe
2
/ZnTe upon cycling.
The resulting CoTe
2
/ZnTe/Ti
3
C
2
T
x
(CZT) demonstrates outstanding rate capability (137.0 mAh g
−1
at 10 A g
−1
) and cycling stability (175.3 mAh g
−1
after 4000 cycles at 3.0 A g
−1
). Moreover, the CZT-based full cells demonstrate excellent energy density (220.2 Wh kg
−1
) and power density (837.2 W kg
−1
).
Exploiting high-rate anode materials with fast K
+
diffusion is intriguing for the development of advanced potassium-ion batteries (KIBs) but remains unrealized. Here, heterostructure engineering is proposed to construct the dual transition metal tellurides (CoTe
2
/ZnTe), which are anchored onto two-dimensional (2D) Ti
3
C
2
T
x
MXene nanosheets. Various theoretical modeling and experimental findings reveal that heterostructure engineering can regulate the electronic structures of CoTe
2
/ZnTe interfaces, improving K
+
diffusion and adsorption. In addition, the different work functions between CoTe
2
/ZnTe induce a robust built-in electric field at the CoTe
2
/ZnTe interface, providing a strong driving force to facilitate charge transport. Moreover, the conductive and elastic Ti
3
C
2
T
x
can effectively promote electrode conductivity and alleviate the volume change of CoTe
2
/ZnTe heterostructures upon cycling. Owing to these merits, the resulting CoTe
2
/ZnTe/Ti
3
C
2
T
x
(CZT) exhibit excellent rate capability (137.0 mAh g
−1
at 10 A g
−1
) and cycling stability (175.3 mAh g
−1
after 4000 cycles at 3.0 A g
−1
, with a high capacity retention of 89.4%). More impressively, the CZT-based full cells demonstrate high energy density (220.2 Wh kg
−1)
and power density (837.2 W kg
−1
). This work provides a general and effective strategy by integrating heterostructure engineering and 2D material nanocompositing for designing advanced high-rate anode materials for next-generation KIBs.