Thermodynamic properties and composites design principles of metal fluoride as active cathode material for lithium batteries

Luo, Sifei; Gao, Minmin; Cai, Danmin; Zhu, Licai; Lai, Caiting; Lin, Jiaomin; Peng, Yanqiu; Yuan, Zhongzhi

doi:10.1016/j.est.2023.108483

Cited by 1 publication

(2 citation statements)

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“…6 The voltage of FeF 3 is higher than 2.74 V vs Li + /Li, 7 and the theoretical specific capacity of 3e − conversion is up to 712 mAh g −1 . 8,9 Despite these outstanding advantages, its practical application is restricted by low conductivity, slow reaction kinetics, and other problems. 10 The solution is usually to nanosize the TMF x compound and to mix or coat it with a large number of conductive carbon materials to improve its electronic conductivity.…”

Section: Introductionmentioning

confidence: 99%

“…These fluorides show a higher specific capacity and energy density than those of the mainstream intercalation-type cathode materials used in lithium-ion batteries, especially FeF 3 with its high voltage characteristics . The voltage of FeF 3 is higher than 2.74 V vs Li + /Li, and the theoretical specific capacity of 3e – conversion is up to 712 mAh g –1 . , Despite these outstanding advantages, its practical application is restricted by low conductivity, slow reaction kinetics, and other problems . The solution is usually to nanosize the TMF x compound and to mix or coat it with a large number of conductive carbon materials to improve its electronic conductivity .…”

Section: Introductionmentioning

confidence: 99%

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Boosting the Electrochemical Performance of Primary and Secondary Lithium Batteries with Mn-Doped All-Fluoride Cathodes

Luo,

Gao,

Cai

et al. 2024

ACS Appl. Mater. Interfaces

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Transition metal fluorides are potentially high specific energy cathode materials of next-generation lithium batteries, and strategies to address their low conductivity typically involve a large amount of carbon coating, which reduces the specific energy of the electrode. In this study, Mn y Fe1–y F3@CF x was generated by the all-fluoride strategy, converting most of the carbon in Mn y Fe1–y F3@C into electrochemical active CF x through a controllable NF3 gas phase fluorination method, while still retaining a tightly bound graphite layer to provide initial conductivity, which greatly improved the energy density of the composite. This synergistic effect of nonfluorinated residual carbon (∼11%) and Mn doping ensures the electrochemical kinetics of the composite. The loading mass of the active substance had been increased to 86%. The theoretical and actual discharge capacity of Mn y Fe1–y F3@CF x composite was up to 765 mAh g–1 (pure FeF3 is 712 mAh g–1) and 728 mAh g–1, respectively. The discharge capacity at the high-voltage (3.0 V) platform was more than three times higher than that of the non-Mn-doped composite (FeF3@CF x ).

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