Understanding the Impact of Fe-Doping on the Structure and Battery Performance of a Co-Free Li-Rich Layered Cathodes

被引：7

作者：

Celeste, Arcangelo ^{[1
,2
]}

Paolacci, Matteo ^{[1
,2
]}

Schiavi, Pier Giorgio ^{[1
]}

Brutti, Sergio ^{[1
]}

Navarra, Maria Assunta ^{[1
,3
]}

Silvestri, Laura ^{[2
]}

机构：

[1] Sapienza Univ Rome, Dept Chem, P Aldo Moro 5, I-00185 Rome, Italy

[2] ENEA CR Casaccia, Dept Energy Technol & Renewable Sources, via Anguillarese 301, I-00123 Rome, Italy

[3] Sapienza Univ Rome, Hydroeco Res Ctr, via A Scarpa 16, I-00161 Rome, Italy

来源：

CHEMELECTROCHEM | 2023年 / 10卷 / 05期

关键词：

Co-free; Fe Doping; Li Ion Batteries; LRLO; Structure Stabilization; LITHIUM-ION BATTERIES; ATOMIC-STRUCTURE; REDOX CHEMISTRY; OXIDE CATHODES; VOLTAGE; CAPACITY; MN; CHALLENGES; STABILITY; SYNERGY;

D O I：

10.1002/celc.202201072

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

A series of Co-free Li-rich layered oxides, Li1.24Mn0.62-xNi0.14FexO2 (x=0, 0.01, 0.02 and 0.03) has been synthetized by a self-combustion reaction. Fe doping affects either lattice structure and bonding as shown by the changes in the size of unit cell calculated from diffraction patterns and in the vibrational frequencies observed in Raman spectra. The electrochemical performance has been evaluated in a lithium cell by galvanostatic cycling: Doped samples show better capacity retention and minor decreases in the specific capacity (i. e., Li1.24Mn0.60Ni0.14Fe0.02O2 can supply a specific capacity of 235 mAhg(-1) with 94 % of capacity retention after 150 cycles). These positive effects originated by alterations in the point defectivity (Ni3+ concentration, anionic and cationic vacancies), changes in the transport properties, as showed by Cyclic Voltammetry; as well as an improved structural resilience compared to the un-doped material in postmortem analyses.

引用

页数：9

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