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Potassium-ion batteries (PIBs) are emerging as promising next-generation electrochemical storage systems for their abundant and low-cost potassium resource. The key point of applying PIBs is to exploit stable K-host materials to accommodate the large-sized potassium ion. In this work, a yolk−shell structured MoS 2 @hollow porous carbon-sphere composite (MoS 2 @HPCS) assembled by engineering HPCSconfined MoS 2 with expanded (002) planes is proposed for boosting potassium-ion storage. When used as a PIB anode, the as-synthesized MoS 2 @HPCS composite shows superior potassium storage performance. It delivers a reversible capacity of 254.9 mAh g −1 at 0.5 A g −1 after 100 discharge/charge cycles and maintains 126.2 mAh g −1 at 1 A g −1 over 500 cycles. The superior potassium-ion storage performance is ascribed to the elaborate yolk−shell nanoarchitecture and the expanded interlayer of the MoS 2 nanosheet, which could shorten the transport distance, enhance the electronic conductivity, relieve the volume variation, prevent the self-aggregation of MoS 2 , facilitate the electrolyte penetration, and boost the intercalation/deintercalation of K + . Moreover, the potential application of the MoS 2 @HPCS composite is also evaluated by assembled K-ion full cells with a perylenetetracarboxylic dianhydride cathode. Accordingly, the as-developed synthetic strategy can be extended to manufacture other host materials for PIBs and beyond.