Enhanced charge storage of Na3FeF6 with carbon nanotubes for lithium-ion batteries

Sun, Shu-bin; Shi, Yujun; Bian, Shilei; Zhuang, Quanchao; Liu, Minqing; Cui, Yanhua

doi:10.1016/j.ssi.2017.10.010

Cited by 10 publications

(6 citation statements)

References 31 publications

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“…The diameters of the first semicircles (named R ct1 ) are close to 2 kΩ and have no significant difference among the four samples. According to previous references, 7,13,39,40 this semicircle corresponds to the reaction between the electrolyte and the SEI. The second semicircles (R ct2 ) have much difference between the four samples.…”

Section: ■ Results and Discussionmentioning

confidence: 88%

Sodium-Storage Performance of K⁺-Intercalated Na_xCu_0.2Mn_0.8O₂

Miao

Long

et al. 2022

ACS Appl. Energy Mater.

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This work proposes a method to prepare a K+-intercalated P2-Na x Cu0.2Mn0.8O2 cathode material for sodium-ion batteries. By calcining a P3-K x Cu0.2Mn0.8O2 in a Na+ rich environment, a K+-intercalated Na x Cu0.2Mn0.8O2 cathode with a stable P2 phase and high K+ content can be obtained. The intercalation of K+ enlarges the interlayer distance and improves the diffusion of Na+, thus enhancing the sodium-storage performance of the material. High capacity (155.1 mAh g–1 at 1 C), high rate performance (71.2 mAh g–1 at 10 C), and good stability (78.18% after 200 cycles at 1 C) can be achieved. It is found that K+ can be well-preserved inside the material during the cycling process. Hence, the enhancement caused by K+ is more evident than other similar materials prepared by conventional methods during the charge and discharge cycles.

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Section: ■ Results and Discussionmentioning

confidence: 88%

Sodium-Storage Performance of K⁺-Intercalated Na_xCu_0.2Mn_0.8O₂

Miao

Long

et al. 2022

ACS Appl. Energy Mater.

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“…On the contrary, BiF 3 measured in IL electrolytes displayed significantly higher capacity retention of 46% over 80 cycles, although its initial capacity is slightly lower (208 mAh g – 1 ). Comparison of the electrochemical performance of BiF 3 with reported systems comprising BiF 3 12 , 14 , 19 , 21 , 24 iron fluorides 7 , 17 , 54 or alkali iron fluorides 55 , 56 can be found in the supporting information (see Supplementary Table 3 ). Notably, superior cycling stability of BiF 3 was revealed in 1 M LiFSI-Pyr 1,4 TFSI electrolyte over 180 cycles, with the capacity ranging between 80 and 90 mAh g -1 (see Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

Thermal synthesis of conversion-type bismuth fluoride cathodes for high-energy-density Li-ion batteries

et al. 2022

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Towards enhancement of the energy density of Li-ion batteries, BiF3 has recently attracted considerable attention as a compelling conversion-type cathode material due to its high theoretical capacity of 302 mAh g−1, average discharge voltage of ca. 3.0 V vs. Li+/Li, the low theoretical volume change of ca. 1.7% upon lithiation, and an intrinsically high oxidative stability. Here we report a facile and scalable synthesis of phase-pure and highly crystalline orthorhombic BiF3via thermal decomposition of bismuth(III) trifluoroacetate at T = 300 °C under inert atmosphere. The electrochemical measurements of BiF3 in both carbonate (LiPF6-EC/DMC)- and ionic liquid-based (LiFSI-Pyr1,4TFSI) Li-ion electrolytes demonstrated that ionic liquids improve the cyclic stability of BiF3. In particular, BiF3 in 4.3 M LiFSI-Pyr1,4TFSI shows a high initial capacity of 208 mA g−1 and capacity retention of ca. 50% over at least 80 cycles at a current density of 30 mA g−1.

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“…Prepared in hydrothermal conditions, Na 3 FeF 6 proved to be more efficient, whatever the variety of carbon used. After 60 cycles, the initial capacities of 458 mAh g –1 with a mixture of graphite and carbon black and 428 mAh g –1 in the presence of carbon nanotubes remained constant at ∼200 and ∼300 mAh g –1 , respectively …”

Section: Fluoride Materials For Positive Electrodesmentioning

confidence: 99%

“…After 60 cycles, the initial capacities of 458 mAh g −1 with a mixture of graphite and carbon black and 428 mAh g −1 in the presence of carbon nanotubes remained constant at ∼200 and ∼300 mAh g −1 , respectively. 72 K 3 FeF 6 and Na 3 FeF 6 microcubes synthesized from a solvothermal synthesis were studied as cathodes for LIB and NIB and display good capacities and so-called reversibility, despite the lack of structure characterization. But voltage values obtained during the electrochemical processes could probably result from conversion reactions.…”

Section: D Fluorinated Materials -A 3 Mf 6 Cryolite Typementioning

confidence: 99%

Fluorinated Materials as Positive Electrodes for Li- and Na-Ion Batteries

et al. 2022

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Fluorine is known to be a key element for various components of batteries since current electrolytes rely on Li-ion salts having fluorinated ions and electrode binders are mainly based on fluorinated polymers. Metal fluorides or mixed anion metal fluorides (mainly oxyfluorides) have also gained a substantial interest as active materials for the electrode redox reactions. In this review, metal fluorides for cathodes are considered; they are listed according to the dimensionality of the metal fluoride subnetwork. The synthesis conditions and the crystal structures are described; the electrochemical properties are briefly indicated, and the nature of the electron transport agent is noted. We stress the crucial importance of the elaboration processes to induce the presence of cation disorders, of anion substitutions (mainly F–/O2– or F–/OH–) or vacancies. Finally, we show that an accurate structural characterization is a key step to enable enhanced material performances to overcome several lasting roadblocks, namely the large irreversible capacity and poor energy efficiency that are frequently encountered.

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Enhanced charge storage of Na3FeF6 with carbon nanotubes for lithium-ion batteries

Cited by 10 publications

References 31 publications

Sodium-Storage Performance of K⁺-Intercalated Na_xCu_0.2Mn_0.8O₂

Sodium-Storage Performance of K⁺-Intercalated Na_xCu_0.2Mn_0.8O₂

Thermal synthesis of conversion-type bismuth fluoride cathodes for high-energy-density Li-ion batteries

Fluorinated Materials as Positive Electrodes for Li- and Na-Ion Batteries

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Enhanced charge storage of Na3FeF6 with carbon nanotubes for lithium-ion batteries

Cited by 10 publications

References 31 publications

Sodium-Storage Performance of K+-Intercalated NaxCu0.2Mn0.8O2

Sodium-Storage Performance of K+-Intercalated NaxCu0.2Mn0.8O2

Thermal synthesis of conversion-type bismuth fluoride cathodes for high-energy-density Li-ion batteries

Fluorinated Materials as Positive Electrodes for Li- and Na-Ion Batteries

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Sodium-Storage Performance of K⁺-Intercalated Na_xCu_0.2Mn_0.8O₂

Sodium-Storage Performance of K⁺-Intercalated Na_xCu_0.2Mn_0.8O₂