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 3 publications

(2 citation statements)

References 135 publications

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Self Cite

View full text Add to dashboard Cite

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Commonalities and Characteristics Analysis of Fluorine and Iodine used in Lithium‐Based Batteries

Gao,

Liu,

et al. 2024

Adv Funct Materials

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Among optimization strategies for solving the poor ion transport ability and electrolyte/electrode interface compatibility problems of lithium (Li)‐based batteries, halogen elements, such as fluorine (F) and iodine (I), have gradually occupied an important position because of their superb electronegativity, oxidizability, ionic radius, and other properties. The study commences by outlining the shared mechanism by which F and I enhance solid‐state lithium metal batteries' electrochemical performance. In particular, F and I can considerably improve ion transport capacity through chemical means such as intermolecular interactions and halogenation reactions. Furthermore, the utilization of F and I significantly enhances the stability of the electrolyte/electrode interface via physical strategies, encompassing doping techniques, the application of surface coatings, and the fabrication of synthetic intermediate layers. Subsequently, the characteristics of F and I used in Li‐based batteries are elaborated in detail, focusing on the fact that F can provide additional energy density as an anode material but by different mechanisms. Additionally, I can considerably activate dead lithium at the negative electrode, and F can act as a new carrier. Finally, a rational concept of the synergistic effect of F and I is proposed and the feasibility of F–I bihalide solid electrolytes is explored.

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Design Double Layered Anode for Stably Introducing Lithium Source to Achieve Sulfur‐Carbon Full Batteries

Zhang,

Lei

et al. 2024

Adv Funct Materials

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Lithium‐sulfur batteries offer high energy density but face great safety and cycle life challenges due to the use of Li metal anode. Replacing the Li metal anode with pre‐lithiated carbon anodes can thoroughly address cycling stability and safety issues. Directly contacting Li foil with graphite electrode is one of the most efficient and simple strategy to introduce a high content of lithium source into the sulfur‐carbon full batteries. However, the 100% lithiation of the graphite anode through the direct contact method generates excessive heat and stress heterogeneity, which leads to electrode structure cracking and electrochemical properties fading. This study implements a double‐layer anode to mitigate these issues. A thin layer of hard carbon placed between graphite and Cu foil limits heat generation and stress heterogeneity due to its structural and electrochemical stability. Additionally, differing from traditional electrochemical lithiation, this method gains better solid electrolyte interphase (SEI) for the graphite anode after several cycles. This research highlights the mass production potential of coupling high energy density lithium source‐free cathode materials with various lithium source‐free anodes for constructing long‐cycle and high‐safety rechargeable batteries.

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

Cited by 3 publications

References 135 publications

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

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

Commonalities and Characteristics Analysis of Fluorine and Iodine used in Lithium‐Based Batteries

Design Double Layered Anode for Stably Introducing Lithium Source to Achieve Sulfur‐Carbon Full Batteries

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