A first-principles study of lithium and sodium storage in two-dimensional graphitic carbon nitride

WANG Meng-yao; LI Jia

doi:10.1016/S1872-5805(18)60353-1

Volume 33 Issue 6

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WANG Meng-yao, LI Jia. A first-principles study of lithium and sodium storage in two-dimensional graphitic carbon nitride. New Carbon Mater., 2018, 33(6): 510-515. doi: 10.1016/S1872-5805(18)60353-1

Citation:

WANG Meng-yao, LI Jia. A first-principles study of lithium and sodium storage in two-dimensional graphitic carbon nitride. New Carbon Mater., 2018, 33(6): 510-515. doi: 10.1016/S1872-5805(18)60353-1

WANG Meng-yao, LI Jia. A first-principles study of lithium and sodium storage in two-dimensional graphitic carbon nitride. New Carbon Mater., 2018, 33(6): 510-515. doi: 10.1016/S1872-5805(18)60353-1

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A first-principles study of lithium and sodium storage in two-dimensional graphitic carbon nitride

doi: 10.1016/S1872-5805(18)60353-1

Guangdong Provincial Key Laboratory of Thermal Management Engineering & Materials, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China

Received Date: 2018-09-12
Accepted Date: 2018-12-27
Rev Recd Date: 2018-11-28
Publish Date: 2018-12-28

Abstract

Abstract

Two-dimensional carbon nitride is considered a very good battery electrode material owing to its uniform-size pores and the presence of nitrogen atoms. First-principles calculations were used to investigate the adsorption and storage of lithium and sodium on monolayer g-C₂N. The capacities of lithium and sodium ion batteries for monolayer g-C₂N are 596 (LiC₂N) and 276 (NaC₄N₂) mAh/g, respectively. The average Li binding energy reaches 2.39 eV relative to isolated Li atoms, which suggests that the lithium capacity achieved on g-C₂N might not be sustained during cycling. By varying the ratio of C to N atoms, it is found that the average Li binding energy is reduced to only 1.69 eV for C:N~5:1, indicating a significant improvement in cycling performance while maintaining the reversible capacity. The mobility barrier energies to Li ion diffusion between two layers in bulk structures with AA and AB stacking sequences are 0.25 and 1.23 eV, respectively, indicating that high Li ion conductivity could be achieved in bulk g-C₂N with AA stacking. These calculations demonstrate that graphitic carbon nitride with uniform-size pores can be used as an electrode material with high capacity and high lithium mobility.
- First-principles calculation,
- Graphitic carbon nitride,
- Lithium and sodium storage

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