What question did this study set out to answer?

To enhance the performance of Li–CO2 batteries by developing high-loaded single-atom catalysts.

January 6, 2026ChemSusChem0 citations

High‐Capacity and Long‐Life Rechargeable Li–CO 2 Batteries Based on N‐Doped Carbon Cathode With High‐Loaded Single Ni Atoms

ZLZixin LiuNanjing University of Aeronautics and Astronautics CLChenyu LvNanjing University of Aeronautics and Astronautics HHHaowei HuaNanjing University of Aeronautics and Astronautics

Key Points

To enhance the performance of Li–CO2 batteries by developing high-loaded single-atom catalysts.
Prepared a high-loaded single-atom Ni/Co catalyst on N-doped carbon.
Measured discharge capacity and overpotential under various current densities.
Performed X-ray absorption fine structure analysis.
Conducted density functional theory calculations to study CO2 interactions.
Achieved a discharge capacity of 51,125 mAh g −1 at 100 mA g −1 current density.
Observed a low overpotential of 1.63 V after 268 stable cycles at 200 mA g −1.
Demonstrated strong adsorption of CO2 reactive species and enhanced electrocatalytic activity.

Abstract

As a novel type of battery for energy devices, Li–CO 2 batteries have a slow kinetic reaction during carbon dioxide reduction and evolution, which leads to problems such as high battery polarization potential, poor cycling performance, and a short lifetime. Therefore, it is important to explore electrocatalysts with high activity and stability. In this study, a novel high‐loaded single‐atom catalyst was prepared by uniformly anchoring single‐atom Ni/Co on N‐doped carbon (NiNC/CoNC). Compared with previous reports, the doping amount of Ni is as high as 10 wt%. The Li–CO 2 battery assembled using NiNC achieves a high discharge capacity of 51,125 mAh g −1 at 100 mA g −1 current density and displays a low overpotential of 1.63 V after 268 stable cycles (more than 2600 h) at 200 mA g −1 current density. The X‐ray absorption fine structure analysis of NiNC reveals the presence of Ni and NiN 4 sites. Combined with density functional theory calculations, it is found that NiNC adsorbs CO 2 reactive species more strongly. Moreover, the electronic synergism of the NiN 4 sites can weaken the decomposition barrier of the discharge product Li 2 CO 3 and accelerate the reaction kinetic process, thereby enhancing the electrocatalytic activities of CO 2 electroreduction and CO 2 reduction reaction.

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