Enhancing the lithium storage capacity of FeF3 cathode material by introducing C@LiF additive

Zhou, Xiangyang; Sun, Hongxu; Zhou, Haidong; Ding, Jing; Xu, Zhanglin; Bin, Wenjie; Tang, Jingjing; Yang, Juan

doi:10.1016/j.jelechem.2018.01.002

Cited by 30 publications

(21 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The nature of the first discharge curve is characterized by a plateau around 3 V for the Cu redox potential, which is significantly different from the discharge profiles that follow. All the subsequent discharge curves have inherent similarities to the voltage profiles associated with the cycling of FeF 3 , − providing further evidence that the Cu 0 /Cu 2+ redox does not play a significant role at high voltage and by extension to the overall electrochemical reversibility of Cu 0.5 Fe 0.5 F 2 . Furthermore, FeF 2 and FeF 3 are well-known for their high reversibility among the conversion compounds; ,, the reversibility of the Cu 1– y Fe y F 2 is thus attributed to the reversible rutile-like phase associated with oxidation of Fe to >2+.…”

Section: Discussionmentioning

confidence: 77%

Intrinsic Challenges to the Electrochemical Reversibility of the High Energy Density Copper(II) Fluoride Cathode Material

Omenya

Zagarella

Rana

et al. 2019

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

CuF 2 is an attractive multielectron cathode material that can store up to ∼528 mAh/g with a high operating voltage (∼3.55 V) and a high gravimetric energy density of (1874 Wh/kg). Unfortunately, the poor electrochemical reversibility of CuF 2 has restricted its application to primary batteries. Herein, we report the key factors limiting the electrochemical reversibility of CuF 2 through a parallel investigation involving a more reversible Cu 0.5 Fe 0.5 F 2 compound. Our findings reveal that the intrinsic limitations to electrochemical reversibility of CuF 2 come from the high diffusivity of Cu ions, leading to phaseseparated nanometallic Cu during discharge and to the transport of cuprous ions through both liquid and solid electrolytes to the Li anode during charge. The former makes reconversion of CuF 2 difficult on charging, while the latter causes the loss of active material from the cathode. Despite suffering from some of the same drawbacks, Cu 0.5 Fe 0.5 F 2 demonstrates improved electrochemical reversibility and cycling stability. This can be attributed to the presence of the Fe in Cu 0.5 Fe 0.5 F 2 , which undergoes reversible conversion (Fe 2+ /Fe 0 ) and intercalation (Fe 3+ /Fe 2+ ) reactions in the low-and high-voltage regime, respectively, which partially compensates for the loss of the electrochemical activity of Cu. In addition, the more highly charged Fe ions are not transported through the electrolyte.

show abstract

Section: Discussionmentioning

confidence: 77%

Intrinsic Challenges to the Electrochemical Reversibility of the High Energy Density Copper(II) Fluoride Cathode Material

Omenya

Zagarella

Rana

et al. 2019

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

show abstract

“…For example, due to the large bandgaps induced by the strong ionic character of the metal–halogen bonds, MFs exhibit notoriously poor electronic conductivity . In order to increase the conductivity, formation of various nanocomposites has been proposed . For example, Li et al ball milled conductive graphite with iron fluoride.…”

Section: Introductionmentioning

confidence: 99%

Fading Mechanisms and Voltage Hysteresis in FeF₂–NiF₂ Solid Solution Cathodes for Lithium and Lithium‐Ion Batteries

Huang

Pollard

Ren

et al. 2019

Small

View full text Add to dashboard Cite

The rapid development of ultrahigh-capacity alloying or conversion-type anodes in rechargeable lithium (Li)-ion batteries calls for matching cathodes for next-generation energy storage devices. The high volumetric and gravimetric capacities, low cost, and abundance of iron (Fe) make conversion-type iron fluoride (FeF 2 and FeF 3 )-based cathodes extremely promising candidates for high specific energy cells. Here, the substantial boost in the capacity of FeF 2 achieved with the addition of NiF 2 is reported. A systematic study of a series of FeF 2 -NiF 2 solid solution cathodes with precisely controlled morphology and composition reveals that the presence of Ni may undesirably accelerate capacity fading. Using a powerful combination of state-of-the-art analytical techniques in combination with the density functional theory calculations, fundamental mechanisms responsible for such a behavior are uncovered. The unique insights reported in this study highlight the importance of careful selection of metals and electrolytes for optimizing electrochemical properties of metal fluoride cathodes.

show abstract

“…While the storage of less than 1 mol Li + per 1 mol [TM] cations is allowed in conventional intercalation-type electrodes, Li[TM]O 2 (TM: transition metal), 9,10 conversion-type electrodes can typically store 2 or 3 mol Li + per 1 mol [TM]. [11][12][13] This nding indicates that conversion-type cathodes can achieve a much larger theoretical capacity than intercalation-type cathodes. However, the application of these materials as cathodes for LRBs requires a high average operation voltage during charge/discharge.…”

Section: Introductionmentioning

confidence: 99%

A high-energy conversion-type cathode activated by amorpholization for Li rechargeable batteries

et al. 2022

View full text Add to dashboard Cite

show abstract

Enhancing the lithium storage capacity of FeF3 cathode material by introducing C@LiF additive

Cited by 30 publications

References 25 publications

Intrinsic Challenges to the Electrochemical Reversibility of the High Energy Density Copper(II) Fluoride Cathode Material

Intrinsic Challenges to the Electrochemical Reversibility of the High Energy Density Copper(II) Fluoride Cathode Material

Fading Mechanisms and Voltage Hysteresis in FeF₂–NiF₂ Solid Solution Cathodes for Lithium and Lithium‐Ion Batteries

A high-energy conversion-type cathode activated by amorpholization for Li rechargeable batteries

Contact Info

Product

Resources

About

Enhancing the lithium storage capacity of FeF3 cathode material by introducing C@LiF additive

Cited by 30 publications

References 25 publications

Intrinsic Challenges to the Electrochemical Reversibility of the High Energy Density Copper(II) Fluoride Cathode Material

Intrinsic Challenges to the Electrochemical Reversibility of the High Energy Density Copper(II) Fluoride Cathode Material

Fading Mechanisms and Voltage Hysteresis in FeF2–NiF2 Solid Solution Cathodes for Lithium and Lithium‐Ion Batteries

A high-energy conversion-type cathode activated by amorpholization for Li rechargeable batteries

Contact Info

Product

Resources

About

Fading Mechanisms and Voltage Hysteresis in FeF₂–NiF₂ Solid Solution Cathodes for Lithium and Lithium‐Ion Batteries