Symmetric lithium-ion cell based on lithium vanadium fluorophosphate with ionic liquid electrolyte

Plashnitsa, Larisa S.; Kobayashi, Eiji; Okada, Shigeto; Yamaki, Jun Ichi

doi:10.1016/j.electacta.2010.10.051

Cited by 40 publications

(28 citation statements)

References 37 publications

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“…A similar fading was also demonstrated by Wang et al [ 326 ] when the halfcell was operated at lower potential (≈1.8 V vs. Li). Contrary to Barker et al [ 324 ] , Plashnitsa et al [ 327 ] observed the dramatic fading of such symmetric cells in conventional organic electrolytes because of the severe reactivity between LiVPO 4 F and acidic LiPF 6 based solution. The cell delivered an initial reversible capacity of ≈126 mAh g −1 and retained ≈92% of initial capacity after 65 cycles ( Figure 16 ).…”

Section: Livpo 4 Fmentioning

confidence: 83%

Research Progress on Negative Electrodes for Practical Li‐Ion Batteries: Beyond Carbonaceous Anodes

Aravindan

Lee

Srinivasan

2015

Advanced Energy Materials

433

319

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3 of 43) 1402225 wileyonlinelibrary.comhost matrix is observed and this process is called "topotactic reaction", which is either chemically or thermally reversible; a perfect example is Li-intercalation into a graphite matrix. Such intercalation chemistry has been successfully used in Li-ion batteries for both anode and cathode materials and has also been commercialized (i.e., LiCoO 2 /Li x C 6 and LiFePO 4 /Li x C 6 ). [ 4,5 ] The insertion type materials, i.e., metal oxides have several advantages over graphitic anodes when used in practical cells; these include a negligible amount of ICL, no Li-platting issues, no solvent co-intercalation, no electrolyte decomposition, no SEI required for the safe operation of the cell, it is capable of delivering high power density, and has an easy synthesis protocol. On the other hand, less reversible capacity and higher intercalation potential are the notable setbacks compared to graphite. Although numerous Li-intercalating materials are proposed as possible anodes for LIB applications, few of them have only been tested or commercialized in the "rocking-chair" confi guration, for instance Li 4 Ti 5 O 5 anode. Apart from the mentioned anode, few other insertion type materials have been also evaluated in the rocking-chair confi guration for LIBs. Accordingly, the next section describes the structural and electrochemical performance of various intercalation anodes evaluated in the rocking-chair confi guration. TiO 2The existence of several polymorphs is reported for the case of TiO 2 , but anatase, rutile, brookite, and bronze phases have only been reported for Li-storage. [ 26 ] Reversible insertion of one mole of Li is theoretically possible, independent of the polymorph, with a capacity of ≈335 mAh g −1 . However, variation in the Liinsertion potential and reaction mechanism has been observed for such polymorphs. Easy synthesis protocols, scalability, inexpensiveness, ease of tailoring the desired morphology, and eco-friendliness are other key features for utilizing TiO 2 polymorphs for the construction of Li-ion power packs. [27][28][29] AnataseThe anatase phase is one of the widely investigated polymorphs of TiO 2 for Li-storage. [ 27 ] Theoretically, one mole of Li is possible, but practically only ≈0.5 mole Li is reversible upon cycling. Several research attempts have been carried out to improve the reversible capacity, including utilizing high energy (0 0 1) facets because of their dominant higher surface energy (0.90 J m −2 ) compared to (1 0 0) facets (0.44 J m −2 ) and using thermodynamically more stable (1 0 1) facets (0.53 J m −2 ). [ 30,31 ] Although high Li-reversibility could be achieved for such (0 0 1) facets, capacity fading remains an issue upon cycling. [ 32 ] Li-diffusion co-effi cient ( D Li ) values for anatase phase are in the range of 1 × 10 −17 to 4 × 10 −17 cm 2 s −1 for Li-insertion and extraction processes, respectively. [ 27 ] In the crystal chemistry of the anatase phase, TiO 6 octahedra sharetwo adjacent edges with two other octahedral so that...

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Section: Livpo 4 Fmentioning

confidence: 83%

Research Progress on Negative Electrodes for Practical Li‐Ion Batteries: Beyond Carbonaceous Anodes

Aravindan

Lee

Srinivasan

2015

Advanced Energy Materials

433

319

View full text Add to dashboard Cite

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“…As an important feature of the symmetric structure, the capability of reverse connection can minimize the detrimental impact to battery life resulted from operation mistakes and increase safety . The reverse connection was realized via operating the battery in the voltage range of ‐2.5 to 2.5 V. The charge/discharge curves exhibit a complete reversibility (Figure c).…”

Section: Resultsmentioning

confidence: 99%

“…To realize such a symmetric battery, a material with several highly reversible redox processes in the voltage range of 0–4.5 V (vs Li + /Li) is needed. To date, various types of symmetric LIBs based on different active materials (e.g., V 2 O 5 , Li 3 V 2 (PO 4 ) 3 , Na 3 V 2 (PO 4 ) 3 , and their derivates) have been developed. NASICON‐type Li 3 V 2 (PO 4 ) 3 (LVP) is regarded as a promising high energy density cathode candidate for LiCoO 2 , with a high theoretical capacity ≈197 mA h g –1 , given by the extraction of three Li + ions when charged to 4.8 V .…”

Section: Introductionmentioning

confidence: 99%

Separator-Integrated, Reversely Connectable Symmetric Lithium-Ion Battery

Wang

Zeng

Cui

et al. 2016

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A separator-integrated, reversely connectable, symmetric lithium-ion battery is developed based on carbon-coated Li3V2(PO4)3 nanoparticles and polyvinylidene fluoride-treated separators. The Li3V2(PO4)3 nanoparticles are synthesized via a facile solution route followed by calcination in Ar/H2 atmosphere. Sucrose solution is used as the carbon source for uniform carbon coating on the Li3V2(PO4)3 nanoparticles. Both the carbon and the polyvinylidene fluoride treatments substantially improve the cycling life of the symmetric battery by preventing the dissolution and shuttle of the electroactive Li3V2(PO4)3. The obtained symmetric full cell exhibits a reversible capacity of ≈ 87 mA h g(-1), good cycling stability, and capacity retention of ≈ 70% after 70 cycles. In addition, this type of symmetric full cell can be operated in both forward and reverse connection modes, without any influence on the cycling of the battery. Furthermore, a new separator integration approach is demonstrated, which enables the direct deposition of electroactive materials for the battery assembly and does not affect the electrochemical performance. A 10-tandem-cell battery assembled without differentiating the electrode polarity exhibits a low thickness of ≈ 4.8 mm and a high output voltage of 20.8 V.

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“…The redox activity between the two LiVPO 4 FLi 2 VPO 4 F compositions is very facile and occurs with an 8 % change in volume and displays a stable specific capacity of 145 mAh g À1 [34]. More recently, Ellis et al [40] and Plashnitsa et al [65] and have utilized LiVPO 4 F as both cathode and anode for fabrication of a symmetric Li-ion LiVPO 4 F//LiVPO 4 F cell with a nonflammable ionic liquid LiBF 4 -EMIBF 4 electrolyte. This symmetrical cell displays a potential window of 2.4 V with a reversible specific capacity of 130 mAh g À1 and has shown to be stable and safe at high temperature up to 80 C. The incorporation of aluminum into the LiV 1Ày Al y PO 4 F framework prepared by the two-step carbothermal reduction method has generated some interesting properties: (1) an almost linear decrease of the discharge capacity on the V 3+/4+ redox couple with Al substitution, (2) a lower polarizability, (3) a gradual upshift in the V 3+/4+ redox peak of 90 mV, and (4) the ratio of the two charge plateaus remains relatively constant for 0 y 0.25 [59].…”

Section: Livpo 4 Fmentioning

confidence: 96%

Fluoro-polyanionic Compounds

et al. 2016

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During the last decade, numerous studies have been devoted to replace oxides by materials with a polyanion-based framework that are considered as safe alternatives for the traditional oxide electrodes [1] [8,9] have all been considered as thermally stable. All these materials usually exhibit excellent stability on longterm cycling by comparison to lithium metal oxides and essentially no release of oxygen from the lattice or reactivity with the electrolyte. However, the materials were found to be poor electronic conductors [3].The search of new cathode materials aiming to maintain a good mix of properties, with focus on electrochemical and safety parameters, has resulted in the improvement of the electrochemical performance using two strategies: (1) substitution of fluorine for oxygen or (2) fluorine coating of the active particles. As a result, fluorinated compounds display several advantages such as high voltage redox reactions, stabilization of the host lattice, protection the electrode particle surface from HF attack and electrolyte decomposition that impedes a side reaction, and easy transport of mobile Li + ions [10][11][12][13][14][15]. Accordingly, anion substitution is expected as an effective way to enhance the electrochemical performance of spinel and layered compounds, especially for NMC materials [16] due to the strong electronegativity of the F À anion, which will make the structure more stable. Among the metal fluorides as surface fluorination (coating) [20]. While these materials are treated in the first and third chapters, attention hereunder is focussed on technological developments of fluorophosphates and fluorosulfates [21][22][23]. The present chapter gives the state of the art in the understanding of the properties of these F-containing materials. Owing to the progress in

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Symmetric lithium-ion cell based on lithium vanadium fluorophosphate with ionic liquid electrolyte

Cited by 40 publications

References 37 publications

Research Progress on Negative Electrodes for Practical Li‐Ion Batteries: Beyond Carbonaceous Anodes

Research Progress on Negative Electrodes for Practical Li‐Ion Batteries: Beyond Carbonaceous Anodes

Separator-Integrated, Reversely Connectable Symmetric Lithium-Ion Battery

Fluoro-polyanionic Compounds

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