Effect of FePO4 coating on electrochemical and safety performance of LiCoO2 as cathode material for Li-ion batteries

Li, Gang; Yang, Zhanxu; Yang, Wensheng

doi:10.1016/j.jpowsour.2008.05.047

Cited by 102 publications

(47 citation statements)

References 26 publications

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“…[27,31,33] This enhanced the cyclic performance of the pristine electrode by eliminating the formation of void spaces between the cathode and conductive additives. [33,34,38,44] Furthermore,t he ALD coating effectively prevents the structural transformation upon cycling, which leads to an increase in capacity retention. As imilar trend was also observed in the rate performance studies.…”

Section: /Comentioning

confidence: 99%

“…This can be attributed to an increasei nr esistance as aresult of the presence of the insulating coating layer. [44] Moreover,t he R sf value is mainly relatedt ot he resistance for Na-ion diffusion through the SEI film. It is clear from Figure 3c that the pristine MNC electrode has al arger R sf value than any ALDcoated electrodes, whichd emonstrates severe damage of the SEI layer during electrochemical cycling.…”

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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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confidence: 99%

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confidence: 99%

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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“…Numerous subsequent studies [15][16][17][18][19][20][21][22][23][24] have shown that Al 2 O 3 -coated cathodes exhibit improved properties. Many other coating materials have also been investigated such as phosphates, [ 15,22,[25][26][27] carbonates, [ 28 ] hydroxides, [ 29 ] oxides (such as ZnO, [15][16][17]30,31 ] ZrO 2 , [15][16][17]21,23,24,32 ] TiO 2 , [ 21,23,32,33 ] MgO, [ 17,20,[34][35][36][37] SiO 2 , [ 23,24 ] Cr 2 O 3 , [ 38 ] Nb 2 O 5 , [ 16 ] Ta 2 O 5 , [ 16 ] SnO 2 [ 20 ] and B 2 O 3 [ 21,23 ] ) and fl uorides (such as AlF 3 , [ 13,15,…”

Section: Doi: 101002/aenm201400690mentioning

confidence: 99%

Thermodynamic Aspects of Cathode Coatings for Lithium‐Ion Batteries

Aykol

Kirklin

Wolverton

2014

Advanced Energy Materials

106

107

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Metal oxide cathode coatings are capable of scavenging the hydrofluoric acid (HF) (present in LiPF6‐based electrolytes) and improving the electrochemical performance of Li‐ion batteries. Here, a first‐principles thermodynamic framework is introduced for designing cathode coatings that consists of four elements: i) HF‐scavenging enthalpies, ii) volumetric and iii) gravimetric HF‐scavenging capacities of the oxides, and iv) cyclable Li loss into coating components. 81 HF‐scavenging reactions involving binary s‐, p‐ and d‐block metal oxides and fluorides are enumerated and these materials are screened to find promising coatings based on attributes (i‐iv). The screen successfully produces known effective coating materials (e.g., Al2O3 and MgO), providing a validation of our framework. Using this design strategy, promising coating materials, such as trivalent oxides of d‐block transition metals Sc, Ti, V, Cr, Mn and Y, are predicted. Finally, a new protection mechanism that successful coating materials could provide by scavenging the wide bandgap and low Li ion conductivity LiF precipitates from the cathode surfaces is suggested.

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“…The atomic layer deposition technique can form well-defined shells of FePO 4 by controlling the thin film growth in a reaction chamber. 27,28 Unfortunately, the atomic layer deposition process is also notorious in terms of its high cost, limited large-scale production, tedious operation and risky precursor chemistry. Regarding the coating strategy, the layer-by-layer assembly protocol of immersing seeds into solutions of desired materials has been a successful practice for anchoring different species.…”

Section: Introductionmentioning

confidence: 99%

Kinetically controlled formation of uniform FePO4 shells and their potential for use in high-performance sodium ion batteries

et al. 2017

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Amorphous iron phosphates are potential cathode materials for sodium ion batteries. The amorphous FePO 4 matrix is able to insert/extract sodium ions reversibly without apparent structural degradation, resulting in stable performance during the charge/discharge process. However, the extremely low electronic conductivity of FePO 4 itself becomes a formidable obstacle for its application as a high-performance cathode material. Here, by tuning the growth kinetics of FePO 4 in an aqueous solution, we were able to control its formation onto a large variety of substrates, forming uniform core-shell structures. Specifically, the use of multiwalled carbon nanotubes as the core material together with the growth control of FePO 4 produced the core-shell structure of MWCNTs@FePO 4 with a delicately controlled shell thicknesses. We confirmed that such a nanocomposite can act as an effective cathode material by taking advantage of both the highly conductive core and the electrochemically active shell, leading to improved battery performance as revealed by the high discharge capacity and the greatly improved rate capability. We anticipate that our progress in FePO 4 control offers new potential in different research fields, such as materials chemistry, catalysis and energy storage devices.

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Effect of FePO4 coating on electrochemical and safety performance of LiCoO2 as cathode material for Li-ion batteries

Cited by 102 publications

References 26 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

Thermodynamic Aspects of Cathode Coatings for Lithium‐Ion Batteries

Kinetically controlled formation of uniform FePO4 shells and their potential for use in high-performance sodium ion batteries

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Effect of FePO4 coating on electrochemical and safety performance of LiCoO2 as cathode material for Li-ion batteries

Cited by 102 publications

References 26 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

Thermodynamic Aspects of Cathode Coatings for Lithium‐Ion Batteries

Kinetically controlled formation of uniform FePO4 shells and their potential for use in high-performance sodium ion batteries

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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

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