TY - JOUR
T1 - Grain-refining Co0.85Se@CNT cathode catalyst with promoted Li2O2 growth kinetics for lithium-oxygen batteries
AU - Yang, Ruonan
AU - Li, Jiajia
AU - Zhang, Dongmei
AU - Zhang, Xiuqi
AU - Li, Xia
AU - Yu, Han
AU - Guo, Zhanhu
AU - Hou, Chuanxin
AU - Lian, Gang
AU - Dang, Feng
N1 - Funding information: This work was supported by National Natural Science Foundation of China (Nos. 52173286, 52207249), Major basic research project of Natural Science Foundation of Shandong Province (No. ZR2023ZD12), the State Key Laboratory of Marine Resource Utilization in South China Sea (Hainan University) (No. MRUKF2023013) and Open Program of Guangxi Key Laboratory of Information Materials (No. 221024-K).
PY - 2024/2/6
Y1 - 2024/2/6
N2 - Highly active cathode catalysts for efficient formation/decomposition of Li2O2 are essential for the performance improvement of lithium-oxygen batteries (LOBs). In this study, a grain-refining Co0.85Se catalyst with a lattice spacing of 2.69 Å of (101) plane closely matching with the (100) plane (2.72 Å) of Li2O2 was applied for high-performance LOBs. Highly (101) plane exposed Co0.85Se@CNT was synthesized by a simple one-pot hydrothermal method. The Co0.85Se with the lattice matching effect not only led to the efficient conversion and polarized growth of Li2O2, but also prevented the formation of byproducts. Density functional theory (DFT) calculations reveal that Co0.85Se (101) plane has the intrinsic catalytic ability to generate/decompose Li2O2 during ORR/OER process, due to its homogeneous electron distribution, suitable adsorption energy, and promoted Li2O2 growth kinetics. As a consequence, the (101) plane highly exposed Co0.85Se@CNT-80 electrode exhibited remarkable cycle stability over 2400h at 100 mA/g and 290 cycles at 500 mA/g, which is about 2 times longer than other electrodes.
AB - Highly active cathode catalysts for efficient formation/decomposition of Li2O2 are essential for the performance improvement of lithium-oxygen batteries (LOBs). In this study, a grain-refining Co0.85Se catalyst with a lattice spacing of 2.69 Å of (101) plane closely matching with the (100) plane (2.72 Å) of Li2O2 was applied for high-performance LOBs. Highly (101) plane exposed Co0.85Se@CNT was synthesized by a simple one-pot hydrothermal method. The Co0.85Se with the lattice matching effect not only led to the efficient conversion and polarized growth of Li2O2, but also prevented the formation of byproducts. Density functional theory (DFT) calculations reveal that Co0.85Se (101) plane has the intrinsic catalytic ability to generate/decompose Li2O2 during ORR/OER process, due to its homogeneous electron distribution, suitable adsorption energy, and promoted Li2O2 growth kinetics. As a consequence, the (101) plane highly exposed Co0.85Se@CNT-80 electrode exhibited remarkable cycle stability over 2400h at 100 mA/g and 290 cycles at 500 mA/g, which is about 2 times longer than other electrodes.
U2 - 10.1016/j.cclet.2024.109595
DO - 10.1016/j.cclet.2024.109595
M3 - Article
SN - 1001-8417
JO - Chinese Chemical Letters
JF - Chinese Chemical Letters
M1 - 109595
ER -