Promoting the Performance of Li-CO(2) Batteries via Constructing Three-Dimensional Interconnected K(+) Doped MnO(2) Nanowires Networks.

Nowadays, Li-CO2 batteries have attracted enormous interests due to their high energy density for integrated energy storage and conversion devices, superiorities of capturing and converting CO2. Nevertheless, the actual application of Li-CO2 batteries is hindered attributed to excessive overpotential and poor lifespan. In the past decades, catalysts have been employed in the Li-CO2 batteries and been demonstrated to reduce the decomposition potential of the as-formed Li2CO3 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 MnO2 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, CO2 transfer and the decomposition of discharge products Li2CO3. It is found that high content of K+ doping can promote the diffusion of ions, electrons and CO2 in the MnO2 air cathode, and promote the octahedral effect of MnO6, stabilize the structure of MnO2 hosts, and improve the catalytic activity of CO2. 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.

Tang Z ，Yuan M ，Zhu H ，Zeng G ，Liu J ，Duan J ，Chen Z ... -  《Frontiers in Chemistry》

Facile Synthesis of Birnessite δ-MnO(2) and Carbon Nanotube Composites as Effective Catalysts for Li-CO(2) Batteries.

Liu Q ，Hu Z ，Li L ，Li W ，Zou C ，Jin H ，Wang S ，Chou SL ... -  《-》

In situ imaging electrocatalytic CO(2) reduction and evolution reactions in all-solid-state Li-CO(2) nanobatteries.

Yang T ，Li H ，Chen J ，Ye H ，Yao J ，Su Y ，Guo B ，Peng Z ，Shen T ，Tang Y ，Zhang L ，Huang J ... -  《-》

A Co-Doped MnO(2) Catalyst for Li-CO(2) Batteries with Low Overpotential and Ultrahigh Cyclability.

Li-CO2 batteries can not only capture CO2 to solve the greenhouse effect but also serve as next-generation energy storage devices on the merits of economical, environmentally-friendly, and sustainable aspects. However, these batteries are suffering from two main drawbacks: high overpotential and poor cyclability, severely postponing the acceleration of their applications. Herein, a new Co-doped alpha-MnO2 nanowire catalyst is prepared for rechargeable Li-CO2 batteries, which exhibits a high capacity (8160 mA h g-1 at a current density of 100 mA g-1 ), a low overpotential (≈0.73 V), and an ultrahigh cyclability (over 500 cycles at a current density of 100 mA g-1 ), exceeding those of Li-CO2 batteries reported so far. The reaction mechanisms are interpreted depending on in situ experimental observations in combination with density functional theory calculations. The outstanding electrochemical properties are mostly associated with a high conductivity, a large fraction of hierarchical channels, and a unique Co interstitial doping, which might be of benefit for the diffusion of CO2 , the reversibility of Li2 CO3 products, and the prohibition of side reactions between electrolyte and electrode. These results shed light on both CO2 fixation and new Li-CO2 batteries for energy storage.

Ge B ，Sun Y ，Guo J ，Yan X ，Fernandez C ，Peng Q ... -  《-》

Facile fabrication of Ni, Fe-doped δ-MnO(2) derived from Prussian blue analogues as an efficient catalyst for stable Li-CO(2) batteries.

Rechargeable Li-CO2 batteries are regarded as an ideal new-generation energy storage system, owing to their high energy density and extraordinary CO2 capture capability. Developing a suitable cathode to improve the electrochemical performance of Li-CO2 batteries has always been a research hotspot. Herein, Ni-Fe-δ-MnO2 nano-flower composites are designed and synthesized by in situ etching a Ni-Fe PBA precursor as the cathode for Li-CO2 batteries. Ni-Fe-δ-MnO2 nanoflowers composed of ultra-thin nanosheets possess considerable surface spaces, which can not only provide abundant catalytic active sites, but also facilitate the nucleation of discharge products and promote the CO2 reduction reaction. On the one hand, the introduction of Ni and Fe elements can improve the electrical conductivity of δ-MnO2. On the other hand, the synergistic catalytic effect between Ni, Fe elements and δ-MnO2 will greatly enhance the cycling performance and reduce the overpotential of Li-CO2 batteries. Consequently, the Li-CO2 battery based on the Ni-Fe-δ-MnO2 cathode shows a high discharge capacity of 8287 mA h g-1 and can stabilize over 100 cycles at a current density of 100 mA g-1. The work offers a promising guideline to design efficient manganese-based catalysts for Li-CO2 batteries.

Chen X ，Chen J ，Qiao Y ，Gao Y ，Fan S ，Liu Y ，Li L ，Liu Y ，Chou S ... -  《-》