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作者:

Si, Yongheng (Si, Yongheng.) | Bai, Kun (Bai, Kun.) | Wang, Yaxin (Wang, Yaxin.) | Lu, Han (Lu, Han.) | Liu, Litong (Liu, Litong.) | Long, Ziyan (Long, Ziyan.) | Zhao, Yujuan (Zhao, Yujuan.)

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EI Scopus SCIE

摘要:

Defective layered Mn-based materials were synthesized by Li/Na ion exchange to improve their electro-chemical activity and Coulombic efficiency. The annealing temperature of the Na precursors was impor-tant to control the P3-P2 phase transition, which directly affected the structure and electrochemical characteristics of the final products obtained by ion exchange. The O3-Li0.78[Li0.25Fe0.075Mn0.675]Od cath-ode made from a P3-type precursor calcined at 700 degrees C was analyzed using X-ray photoelectron spectrom-etry and electron paramagnetic resonance. The results showed that the presence of abundant trivalent manganese and defects resulted in a discharge capacity of 230 mAh/g with an initial Coulombic efficiency of about 109%. Afterward, galvanostatic intermittent titration was performed to examine the Li+ ion dif-fusion coefficients, which affected the reversible capacity. First principles calculations suggested that the charge redistribution induced by oxygen vacancies (OVs) greatly affected the local Mn coordination envi-ronment and enhanced the structural activity. Moreover, the Li-deficient cathode was a perfect match for the pre-lithiation anode, providing a novel approach to improve the initial Coulombic efficiency and activity of Mn-based materials in the commercial application.(c) 2023 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.

关键词:

Ion exchange Defective cathode materials Initial coulombic efficiency DFT calculations Oxygen vacancies

作者机构:

  • [ 1 ] [Si, Yongheng]Beijing Univ Technol, Fac Environm & Life, Dept Chem, Beijing Key Lab Green Catalysis & Separat, Beijing 100124, Peoples R China
  • [ 2 ] [Bai, Kun]Beijing Univ Technol, Fac Environm & Life, Dept Chem, Beijing Key Lab Green Catalysis & Separat, Beijing 100124, Peoples R China
  • [ 3 ] [Wang, Yaxin]Beijing Univ Technol, Fac Environm & Life, Dept Chem, Beijing Key Lab Green Catalysis & Separat, Beijing 100124, Peoples R China
  • [ 4 ] [Lu, Han]Beijing Univ Technol, Fac Environm & Life, Dept Chem, Beijing Key Lab Green Catalysis & Separat, Beijing 100124, Peoples R China
  • [ 5 ] [Liu, Litong]Beijing Univ Technol, Fac Environm & Life, Dept Chem, Beijing Key Lab Green Catalysis & Separat, Beijing 100124, Peoples R China
  • [ 6 ] [Long, Ziyan]Beijing Univ Technol, Fac Environm & Life, Dept Chem, Beijing Key Lab Green Catalysis & Separat, Beijing 100124, Peoples R China
  • [ 7 ] [Zhao, Yujuan]Beijing Univ Technol, Fac Environm & Life, Dept Chem, Beijing Key Lab Green Catalysis & Separat, Beijing 100124, Peoples R China

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来源 :

JOURNAL OF ENERGY CHEMISTRY

ISSN: 2095-4956

年份: 2023

卷: 82

页码: 537-546

1 3 . 1 0 0

JCR@2022

ESI学科: CHEMISTRY;

ESI高被引阀值:20

被引次数:

WoS核心集被引频次:

SCOPUS被引频次: 5

ESI高被引论文在榜: 0 展开所有

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中文被引频次:

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