Li2Fe(SO4)2 as a 3.83V positive electrode material

Reynaud, Marine; Ati, Mohamed; Melot, Brent C.; Sougrati, Moulay Tahar; Rousse, Gwenaëlle; Chotard, Jean‐Noël; Tarascon, Jean‐Marie

doi:10.1016/j.elecom.2012.04.027

Cited by 74 publications

(102 citation statements)

References 9 publications

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“…Since then, a large variety of polyanionic compounds 8 such as silicates 9 , sulfates 10 and borates 11 has emerged as potential candidates. The strong binding of oxygen endows the polyanionic materials better thermal stability and thus safety.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Li 2 FeSiO 4 /carbon nano-composites by impregnation method

Sun

Ghimbeu

Vix‐Guterl

et al. 2015

Journal of Power Sources

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Section: Introductionmentioning

confidence: 99%

Synthesis of Li 2 FeSiO 4 /carbon nano-composites by impregnation method

Sun

Ghimbeu

Vix‐Guterl

et al. 2015

Journal of Power Sources

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“…The plateau in the voltage-composition trace on charge and discharge suggests a two-phase intercalation process, as confirmed by PITT measurements [98]. During the first charge of Li 2 Fe(SO 4 ) 2 to 4.5 V versus Li + /Li 0 , nearly 1 Li + ion per formula unit is removed from the structure.…”

Section: Carbonophosphatesmentioning

confidence: 72%

“…These results lead to new opportunities to improve the performance of novel carbonophosphate cathode materials by doping and structural tuning. [97,98]. This finding has not only paved the way for the development of a totally new class of fluorine-free compounds but could also reveal fundamental structure-property relationships in Li-ion cathode materials.…”

Section: Carbonophosphatesmentioning

confidence: 88%

“…Li 2 M(SO 4 ) 2 (M = Fe, Co) has been fully indexed to the monoclinic unit cell with the space group P2 1 /c [98,102]. The structure, as shown in Fig.…”

Section: Carbonophosphatesmentioning

confidence: 99%

“…As previously mentioned, the iron compound was noted for displaying an open circuit voltage of 3.83 V versus Li + /Li 0 , involving one lithium ion per formula unit and the Fe 3+ /Fe 2+ redox couple [98]. Phase pure Li 2 M(SO 4 ) 2 (M = Fe, Co, Mn) compounds were prepared by a three-step process.…”

Section: Carbonophosphatesmentioning

confidence: 99%

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Polyanion Compounds as Cathode Materials for Li-Ion Batteries

Guo

et al. 2015

Rechargeable Batteries

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The development of high energy density Li-ion batteries depends on finding electrode materials that can meet increasingly stringent demands, in particular cathode materials [1,2]. Cathodes are not only the primary factor producing the working potential of Li-ion batteries, but also determine the number of Li ions (i.e., the practical capacity) which can be utilized. Due to LiFePO 4 having succeeded as a prime example of high powered Li-ion battery material, polyanion-type compounds have attracted wide interests in the field of cathode research for the last two decades. Although polyanion compounds exhibit disadvantages of weight and volume (i.e., they have smaller theoretical gravimetric or volumetric capacities) compared with layered oxide compounds, their inherent advantages are also clear. They have very stable frameworks that provide long-term structural stability, which is essential for extensive cycling and combating safety issues. In addition, the chemical nature of polyanions allows the monitoring of a given M n+ /M (n−1)+ redox couple through the inductive effect introduced by Goodenough [3,4], and gives rise to higher voltage values versus Li + /Li 0 than in oxides. Finally, a large number of atomic arrangements and crystal structures can be adopted by polyanion compounds, which have an extreme versatility with respect to cation and anion substitutions for a given structural type.In the last two decades, compounds with different polyanion groups such as phosphates (PO 4 3− ), pyrophosphates (P 2 O 7 4− ), silicates(SiO 4 4− ), sulfates(SO 4 2− ), borates (BO 3 3− ) as well as their fluorinated compounds have been widely investigated in the literature. In this chapter, some recent studies of polyanion compounds for use in Li-ion batteries are introduced and summarized. Some review papers in this field can also be found in the literature [5,6]. Here, we mainly focus on the different polyanion compounds in use as cathode materials, except for olivine-type LiFePO 4 and its analogues.

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Fast‐Rate Capable Electrode Material with Higher Energy Density than LiFePO₄: 4.2V LiVPO₄F Synthesized by Scalable Single‐Step Solid‐State Reaction

2015

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Use of compounds that contain fluorine (F) as electrode materials in lithium ion batteries has been considered, but synthesizing single‐phase samples of these compounds is a difficult task. Here, it is demonstrated that a simple scalable single‐step solid‐state process with additional fluorine source can obtain highly pure LiVPO4F. The resulting material with submicron particles achieves very high rate capability ≈100 mAh g−1 at 60 C‐rate (1‐min discharge) and even at 200 C‐rate (18 s discharge). It retains superior capacity, ≈120 mAh g−1 at 10 C charge/10 C discharge rate (6‐min) for 500 cycles with >95% retention efficiency. Furthermore, LiVPO4F shows low polarization even at high rates leading to higher operating potential >3.45 V (≈3.6 V at 60 C‐rate), so it achieves high energy density. It is demonstrated for the first time that highly pure LiVPO4F can achieve high power capability comparable to LiFePO4 and much higher energy density (≈521 Wh g−1 at 20 C‐rate) than LiFePO4 even without nanostructured particles. LiVPO4F can be a real substitute of LiFePO4.

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Li2Fe(SO4)2 as a 3.83V positive electrode material

Cited by 74 publications

References 9 publications

Synthesis of Li 2 FeSiO 4 /carbon nano-composites by impregnation method

Synthesis of Li 2 FeSiO 4 /carbon nano-composites by impregnation method

Polyanion Compounds as Cathode Materials for Li-Ion Batteries

Fast‐Rate Capable Electrode Material with Higher Energy Density than LiFePO₄: 4.2V LiVPO₄F Synthesized by Scalable Single‐Step Solid‐State Reaction

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Li2Fe(SO4)2 as a 3.83V positive electrode material

Cited by 74 publications

References 9 publications

Synthesis of Li 2 FeSiO 4 /carbon nano-composites by impregnation method

Synthesis of Li 2 FeSiO 4 /carbon nano-composites by impregnation method

Polyanion Compounds as Cathode Materials for Li-Ion Batteries

Fast‐Rate Capable Electrode Material with Higher Energy Density than LiFePO4: 4.2V LiVPO4F Synthesized by Scalable Single‐Step Solid‐State Reaction

Contact Info

Product

Resources

About

Fast‐Rate Capable Electrode Material with Higher Energy Density than LiFePO₄: 4.2V LiVPO₄F Synthesized by Scalable Single‐Step Solid‐State Reaction