Facile synthesis of ZrO2 coated Li2CoPO4F cathode materials for lithium secondary batteries with improved electrochemical properties

Pandian, Amaresh Samuthira; Karthikeyan, K.; Kim, K.J.; Kim, M.C.; Chung, Kyung Yoon; Cho, Byung Won; Lee, Y.S.

doi:10.1016/j.jpowsour.2012.12.010

Cited by 32 publications

(42 citation statements)

References 37 publications

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“…This results in an increase in Na-ion storager elative to that of the pristine MNC electrode. [33,38,45] These results clearly reveal that ALD coating has as ignificant impact on the cyclic behavior of the pristine electrode, especially in ahigh cutoff voltage range, and could be used to develop high-energy-density SIBs, which could be utilized for large-scale applications.…”

mentioning

confidence: 84%

“…This may restrict the full utilizationo fa ctive materials at high discharge current rates for charge-storage reactions. [33,45] The results obtained from the rate-performance study indicate that the MNC-2 electrode displays higher capacity values than the pristine MNC, MNC-5, andM NC-10 electrodes as ar esult of an increase in conductivity (Figure 2d). Additionally,e lectrolyte oxidation at high discharge current rates is severe and results in rapid SEI film erosion.…”

Section: /Comentioning

confidence: 96%

“…This may be ar esult of the thick insulatingA l 2 O 3 layer. [30,33,[36][37][38][39][40]45] From the C-DC and rate performance analysis, it can be concluded that 2A LD cycles of Al 2 O 3 coating are optimal for obtaining high-rate-performance electrodes for large-scale SIB applications. [34,37,38] To further analyze the electrochemical nature of pristine and ALD-coated electrodes,C Vm easurements were conducted at voltages between 2a nd 4.5 Vatascan rate of 0.1 mV s…”

Section: /Comentioning

confidence: 99%

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Highly Stable Na_2/3(Mn_0.54Ni_0.13Co_0.13)O₂ Cathode Modified by Atomic Layer Deposition for Sodium‐Ion Batteries

et al. 2015

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For the first time, atomic layer deposition (ALD) of Al2 O3 was adopted to enhance the cyclic stability of layered P2-type Na2/3 (Mn0.54 Ni0.13 Co0.13 )O2 (MNC) cathodes for use in sodium-ion batteries (SIBs). Discharge capacities of approximately 120, 123, 113, and 105 mA h g(-1) were obtained for the pristine electrode and electrodes coated with 2, 5, and 10 ALD cycles, respectively. All electrodes were cycled at the 1C discharge current rate for voltages between 2 and 4.5 V in 1 M NaClO4 electrolyte. Among the electrodes tested, the Al2 O3 coating from 2 ALD cycles (MNC-2) exhibited the best electrochemical stability and rate capability, whereas the electrode coated by 10 ALD cycles (MNC-10) displayed the highest columbic efficiency (CE), which exceeded 97 % after 100 cycles. The enhanced electrochemical stability observed for ALD-coated electrodes could be a result of the protection effects and high band-gap energy (Eg =9.00 eV) of the Al2 O3 coating layer. Additionally, the metal-oxide coating provides structural stability against mechanical stresses occurring during the cycling process. The capacity, cyclic stability, and rate performance achieved for the MNC electrode coated with 2 ALD cycles of Al2 O3 reveal the best results for SIBs. This study provides a promising route toward increasing the stability and CE of electrode materials for SIB application.

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mentioning

confidence: 84%

Section: /Comentioning

confidence: 96%

Section: /Comentioning

confidence: 99%

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Highly Stable Na_2/3(Mn_0.54Ni_0.13Co_0.13)O₂ Cathode Modified by Atomic Layer Deposition for Sodium‐Ion Batteries

et al. 2015

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“…[6][7][8] By coating Li 2 CoPO 4 F particles with Li 3 PO 4 , Al 2 O 3 or ZrO 2 or decreasing the particle size this drawback can be overcome. [10][11][12] Herein, we report the preparation of Li 2 CoPO 4 F composed of small particles via the direct conversion of a sub-micrometer particle mixture of LiCoPO 4 and LiF, which in turn was prepared by a solvothermal one-step reaction.…”

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confidence: 99%

A Two-Step Synthesis for Li₂CoPO₄F as High-Voltage Cathode Material

Schoiber

Berger

Yada

et al. 2015

J. Electrochem. Soc.

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Li 2 CoPO 4 F has been synthesized via a novel two-step reaction from a solvothermally prepared precursor mixture of LiCoPO 4 and LiF. Solvent influences were monitored by powder X-ray diffraction and the reaction conditions for the conversion of the precursor mixture to Li 2 CoPO 4 F were optimized. In addition, the obtained materials were characterized before and after carbon-coating by SEM, N 2 sorption, elemental and thermogravimetric analysis. The electrochemical performance of the products as high-voltage cathode materials in a coin-cell was tested, and long term stability over 50 charge/discharge cycles could be demonstrated.

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“…Various vanadium-based fluorophosphates were evaluated as cathode material for Li-ion batteries [35,[70][71][72][73][74][75][76][77][78][79][80][81][82][83]. Wang et al [81] Li extraction/insertion reaction from/into the Li 1+x TiPO 4 F framework occurs in the range À0.5 x 0.5 with the appearance of two pseudo-plateaus centered at 2.9 and 1.8 V corresponding to the Ti 3+ !…”

Section: Livpo 4 Fmentioning

confidence: 99%

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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Facile synthesis of ZrO2 coated Li2CoPO4F cathode materials for lithium secondary batteries with improved electrochemical properties

Cited by 32 publications

References 37 publications

Highly Stable Na_2/3(Mn_0.54Ni_0.13Co_0.13)O₂ Cathode Modified by Atomic Layer Deposition for Sodium‐Ion Batteries

Highly Stable Na_2/3(Mn_0.54Ni_0.13Co_0.13)O₂ Cathode Modified by Atomic Layer Deposition for Sodium‐Ion Batteries

A Two-Step Synthesis for Li₂CoPO₄F as High-Voltage Cathode Material

Fluoro-polyanionic Compounds

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Facile synthesis of ZrO2 coated Li2CoPO4F cathode materials for lithium secondary batteries with improved electrochemical properties

Cited by 32 publications

References 37 publications

Highly Stable Na2/3(Mn0.54Ni0.13Co0.13)O2 Cathode Modified by Atomic Layer Deposition for Sodium‐Ion Batteries

Highly Stable Na2/3(Mn0.54Ni0.13Co0.13)O2 Cathode Modified by Atomic Layer Deposition for Sodium‐Ion Batteries

A Two-Step Synthesis for Li2CoPO4F as High-Voltage Cathode Material

Fluoro-polyanionic Compounds

Contact Info

Product

Resources

About

Highly Stable Na_2/3(Mn_0.54Ni_0.13Co_0.13)O₂ Cathode Modified by Atomic Layer Deposition for Sodium‐Ion Batteries

Highly Stable Na_2/3(Mn_0.54Ni_0.13Co_0.13)O₂ Cathode Modified by Atomic Layer Deposition for Sodium‐Ion Batteries

A Two-Step Synthesis for Li₂CoPO₄F as High-Voltage Cathode Material