Improving thermal and electrochemical performances of LiCoO 2 cathode at high cut-off charge potentials by MF 3 (M=Ce, Al) coating

Aboulaich, Abdelhay; Ouzaouit, Khalid; Faqir, H.; Kaddami, Abderrahman; Benzakour, Intissar; Akalay, Ismail

doi:10.1016/j.materresbull.2015.09.020

Cited by 59 publications

(27 citation statements)

References 37 publications

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“…However, larger changes are observed with respect to the c-axis, in agreement with other works. 9,[59][60][61][62] The Rietveld refinement also confirmed the presence of a minority second phase of the spinel Co 3 O 4 in the blank test, gelatin and starch samples. This observation is related to the crystallite energy formation.…”

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confidence: 56%

“…A small amount of spinel Co 3 O 4 was found as secondary phase in the diffraction patterns of the blank test and of the starch and gelatin precursors, although HT-LiCoO 2 can be described as a major constituent. 6,9,[57][58][59][60][61][62] The XRD analyses of the HT-LiCoO 2 compounds synthesized with the precursors and the blank test were compared to evaluate the influence of the gelling agent in the product structural formation. The analysis of Figure 4 shows that the precursors' XRD has narrower peaks than the blank test.…”

Section: Resultsmentioning

confidence: 99%

“…2,4 The investigation of the structural aspects of the material is a crucial issue to better understand the electrochemical properties of the LiCoO 2 compound. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] For example, the nature of the crystal, its size and shape, are directly related with its electrochemical characteristics. 2 The LiCoO 2 synthesized at low temperatures (LT), below 500 °C, presents a cubic spinel structure ( ), while the synthesis at high temperatures (HT) (above 500 °C), generates the rhombohedral structure with stratified layers ( ).…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of LiCoO2 from Different Precursors by Sol‑Gel Method

Freitas

Siqueira

Costa

et al. 2017

J. Braz. Chem. Soc.

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Lithium cobalt oxide, LiCoO 2 , widely used as cathode in lithium ion batteries was synthesized and their structural and electronic properties investigated. The crystalline powders were prepared by the sol-gel method with four complexing agents: citric acid, glycine, starch and gelatin. These syntheses were compared with the blank test (without complexing agent). The X-ray diffraction and vibrational spectroscopy allowed the identification of the rhombohedral phase LiCoO 2 ( ) as the only or principal crystalline component in all samples. A small fraction of a second phase of cubic spinel Co 3 O 4 was observed in the samples of starch, gelatin and the blank test. The Rietveld refinements showed small structural variations, indicating reduced influence of the complexing agents on the synthesis. The theoretical HOMO-LUMO (highest occupied molecular orbital-lowest unoccupied molecular orbital) gap values are in agreement to those estimated by diffuse reflectance spectroscopy (DRS). The scanning electron microscopy (SEM) showed morphological pattern regardless of the complexing agent used, showing an alternative method.Keywords: LiCoO 2 , sol-gel method, XRD, Rietveld refinement, lithium ion batteries, DFT IntroductionLithium cobalt oxide, LiCoO 2 , has been the focus of many studies regarding their structural and electronic properties. [1][2][3][4][5][6][7][8] This system has interesting electrochemical features that allows a wide use as cathodes of lithium ion batteries. 2,4 The investigation of the structural aspects of the material is a crucial issue to better understand the electrochemical properties of the LiCoO 2 compound. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] For example, the nature of the crystal, its size and shape, are directly related with its electrochemical characteristics. 2 The LiCoO 2 synthesized at low temperatures (LT), below 500 °C, presents a cubic spinel structure ( ), while the synthesis at high temperatures (HT) (above 500 °C), generates the rhombohedral structure with stratified layers ( ). Therefore, several authors usually classify these structures as LT-LiCoO 2 and HT-LiCoO 2 , respectively . 1,2,7,8,[18][19][20][21][22][23][24] The rhombohedral phase is characterized by a structure with alternating layers of cobalt and lithium cations intercalated with oxygen anions. 22 The lithium and cobalt(III) ions are arranged in intercalated layers (Figure 1a). The cobalt(III) ion is located at the octahedral sites, forming a strong bond with the neighboring oxygen anion to constitute the Co−O layers (Figure 1b). Finally, the lithium layers are intercalated between the CoO 2 plans. 1,3,4 The octahedral sites of these layers are occupied by lithium and cobalt(III) ions alternately that forms a sequential stacking with oxygen ion layers in a close packing of the ABCABC type ( Figure 1c). 4,5 This specific stacking arrangement leads to an environment equivalent for all ions, allowing the maximum charge delocalization and the minimal system energy. 1,3,4 The degree of crystal orde...

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confidence: 56%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis and Characterization of LiCoO2 from Different Precursors by Sol‑Gel Method

Freitas

Siqueira

Costa

et al. 2017

J. Braz. Chem. Soc.

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“…In the other type, the modification layer is deposited on the surface of made-up cathode plates [19,20]. Although the surface modification on individual LCO particles is effective to improve its cycling stability [16][17][18], and can be easily realized via low-cost wet chemical routes [21][22][23][24], there are some disadvantages limit its application. For example, the modification layer on particles may break due to the severe mechanical impacts during slurry mixing and electrode calendering [13].…”

Section: Introductionmentioning

confidence: 99%

Improved cycling stability of LiCoO2 at 4.5 V via surface modification of cathode plates with conductive LLTO

Song

Peng

Huang

et al. 2020

Preprint

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The stability issue of LiCoO 2 cycled at high voltages is one of the burning questions for the development of lithium ion batteries with high energy density and long cycling life. Although it is effective to improve the cycling performance of LiCoO 2 via coating individual LiCoO 2 particles with another metal oxides or fluorides, the rate capacity is generally compromised because the typical coating materials are poor conductors. Herein, amorphous Li 0.33 La 0.56 TiO 3 , one of the most successful solid electrolytes, was directly deposited on the surface of made-up LiCoO 2 cathode plates through magnetron sputtering. Not only the inherent conductive network in the made-up LiCoO 2 cathode plates was retained, but also the Li + transport in bulk and across the cathode-electrolyte interface was enhanced. In addition, the surface chemical analysis of the cycled LiCoO 2 cathode plates suggests that most of the stability issues can be addressed via the deposition of amorphous Li 0.33 La 0.56 TiO 3 . With an optimized deposition time, the LiCoO 2 cathode plates modified by Li 0.33 La 0.56 TiO 3 performed a steady reversible capacity of 150 mAh/g at 0.2 C with the cut-off voltage from 2.75 to 4.5 V vs. Li + /Li, and an 84.6% capacity gain at 5 C comparing with the pristine one.

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“…an interfacial stabilizer, as it is proposed to prevent cathode/electrolyte interfacial degradation by the decomposition of the electrolyte at high potentials and stops acidic species from the electrolyte attacking the electrode material [10][11][12][13][14][15][16][17]. It not being used as the electrode material maybe due to it being highly insulating, the redox potential not suitable for use with lithium and aluminum being used as a current collector as it is stable and unreactive in most lithium salt-based electrolytes.…”

Section: Introductionmentioning

confidence: 99%

Investigations of aluminum fluoride as a new cathode material for lithium-ion batteries

Owen

Zhang

2017

J Appl Electrochem

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Improving thermal and electrochemical performances of LiCoO 2 cathode at high cut-off charge potentials by MF 3 (M=Ce, Al) coating

Cited by 59 publications

References 37 publications

Synthesis and Characterization of LiCoO2 from Different Precursors by Sol‑Gel Method

Synthesis and Characterization of LiCoO2 from Different Precursors by Sol‑Gel Method

Improved cycling stability of LiCoO2 at 4.5 V via surface modification of cathode plates with conductive LLTO

Investigations of aluminum fluoride as a new cathode material for lithium-ion batteries

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