DataVXACS Applied Energy MaterialsPaper
journal article·2022-12-26

Revealing the Ultrahigh Rate Performance of the La and Ce Co-doping LiFePO4 Composite

Baofeng Zhang, Xiaoning Ma, Wenqiang Hou, Wei yuan, Lixia He, Ou Yang, Yuebo Liu, Jie Wang, Youlong Xu

ACS Applied Energy Materials· Volume 5· Issue 12
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Source abstract

Abstract

LiFePO4 with ultrahigh rate ability and enhanced electronic/ionic conductivity can be achieved by element doping. However, the role of substitution on the electronic/ionic conductivity and size effect on the electrochemical performance are still open. Here, LiFePO4 particles (LC-LFP) with tuned sizes are synthesized via La and Ce co-doping, delivering a capacity of 91.9 mAh g–1 under 200 C. In addition, LC-LFP exhibit a power density as high as 57.6 kW kg–1 when the energy density is nearly 300 Wh kg–1 owing to the 105 enhancement of inherent conductivity and 105 Li+ diffusion ability. DFT results suggest that La and Ce co-doping would not only facilitate free Li+ ions to extrude out of the unit cell due to the structure distortion but also generate extra middle-gap states to boost the carrier concentration. Furthermore, it appears that atoms on the surface of the particles tend to decrease the band gap and lower the conduction band compared to the atoms in the bulk. This work demonstrates and discloses a promising strategy to enhance the rate performance of LiFePO4 by element co-doping.
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Research context

Composites

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Supercapacitor Materials and Fabrication

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710021, China

Shaanxi Engineering Research Center of Advanced Energy Materials & Devices, School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710021, China

National Center for Nano science and Technology (NCNST), Beijing Institute of Nano energy and Nano systems, Chinese Academy of Sciences, Beijing 100083, China

School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, China

Funding

Ministry of Science and Technology of the People's Republic of China · China Postdoctoral Science Foundation · Beijing Municipal Science and Technology Commission · Central University Basic Research Fund of China · National Natural Science Foundation of China · Key Research and Development Projects of Shaanxi Province

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