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Nowadays, Li-CO 2 batteries have attracted enormous interests due to their high energy density for integrated energy storage and conversion devices, superiorities of capturing and converting CO 2 . Nevertheless, the actual application of Li-CO 2 batteries is hindered attributed to excessive overpotential and poor lifespan. In the past decades, catalysts have been employed in the Li-CO 2 batteries and been demonstrated to reduce the decomposition potential of the as-formed Li 2 CO 3 during charge process with high efficiency. However, as a representative of promising catalysts, the high costs of noble metals limit the further development, which gives rise to the exploration of catalysts with high efficiency and low cost. In this work, we prepared a K + doped MnO 2 nanowires networks with three-dimensional interconnections (3D KMO NWs) catalyst through a simple hydrothermal method. The interconnected 3D nanowires network catalysts could accelerate the Li ions diffusion, CO 2 transfer and the decomposition of discharge products Li 2 CO 3 . It is found that high content of K + doping can promote the diffusion of ions, electrons and CO 2 in the MnO 2 air cathode, and promote the octahedral effect of MnO 6 , stabilize the structure of MnO 2 hosts, and improve the catalytic activity of CO 2 . Therefore, it shows a high total discharge capacity of 9,043 mAh g -1 , a low overpotential of 1.25 V, and a longer cycle performance., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2021 Tang, Yuan, Zhu, Zeng, Liu, Duan and Chen.)