Crystal structure and spectroscopic properties of LixNi1 − yTiyO2 and their electrochemical behavior

Chang, Seung‐Hwan; Kang, Seong‐Gu; Song, Seung‐Wan; Yoon, Joo‐Byoung; Choy, Jin‐Ho

doi:10.1016/0167-2738(96)00117-8

Cited by 56 publications

(47 citation statements)

References 11 publications

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“…To improve the electrochemical properties of LiNiO 2 , Co [20][21][22][23][24], Al [25][26][27][28], Ti [29][30][31][32], Ga [33], Mn [34] and Fe [35][36][37][38][39] ions were substituted for nickel ions by synthesis in oxygen. Reimers et al [35] studied solid solution series of LiFe y Ni 1-y O 2 (0.1 B y B 0.5).…”

Section: Introductionmentioning

confidence: 99%

Electrochemical properties of Li1−z (Ni1−y Fe y )1+z O2 synthesized by the combustion method in an air atmosphere

Song

Kwon

Song³

et al. 2008

J Appl Electrochem

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For the syntheses of LiNi 1-y Fe y O 2 (0.000 B y B 0.300), mixtures of the starting materials with the desired compositions were preheated in an air atmosphere at 400°C for 30 min and calcined in air at 700°C for 48 h. The phases appearing in the intermediate reaction steps for the formation of lithium nickel oxide are deduced from the DTA analysis. XRD analysis, FE-SEM observation, FTIR analysis and electrochemical measurement were performed for the synthesized Li 1-z (Ni 1-y Fe y ) 1?z O 2 (0.000 B y B 0.300) samples. The samples of Li 1-z (Ni 1-y Fe y ) 1?z O 2 with y = 0.025 and 0.050 have higher first discharge capacities than Li 1-z (Ni 1-y Fe y ) 1?z O 2 with y = 0.000 and better or similar cycling performance at the 0.1 C rate in the voltage range of 2.7-4.2 V. Similar results have not previously been reported except for Co-substituted LiNiO 2 . The sample Li 1-z (Ni 0.975 Fe 0.025 ) 1?z O 2 has the highest first discharge capacity (176.5 mAh g -1 ). Rietveld refinement of the XRD patterns of LiNi 1-y Fe y O 2 (0.000 \ y B 0.100) from a starting structure model [Li,Ni] 3b [Li,Ni,Fe] 3a [O 2 ] 6c showed that cation disordering occurred in the samples.

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Section: Introductionmentioning

confidence: 99%

Electrochemical properties of Li1−z (Ni1−y Fe y )1+z O2 synthesized by the combustion method in an air atmosphere

Song

Kwon

Song³

et al. 2008

J Appl Electrochem

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“…They showed that aluminum substitution suppressed all the phase transitions observed for the LiNiO 2 system. Chang et al [16] detected partial disordering between the transition metal (Ni and Ti) layer and lithium by Rietveld refinement in Li x Ni 1-y Ti y O 2 (0.1 B y B 0.5) prepared by solid state reaction. By considering the ionic radius and the Ni-O bond length, they concluded that the Ni(II) ions are partially stabilized in the lithium sites.…”

Section: Introductionmentioning

confidence: 98%

“…To improve the electrochemical properties of LiNiO 2 , Co [13], Al [14,15], Ti [16], Ga [11], Mn [17] and Fe [18,19] were substituted for nickel by the synthesis in oxygen. Guildmard et al [14] investigated the electrochemical performances of LiNi 1-y Al y O 2 (0.10 B y B 0.50) specimens synthesized by a co-precipitation method.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical properties of LiNi1−y M y O2 (M=Ni, Ga, Al and/or Ti) cathodes synthesized by the combustion method

et al. 2008

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LiNiO 2 , LiNi 0.995 Al 0.005 O 2 , LiNi 0.975 Ga 0.025 O 2 , LiNi 0.990 Ti 0.010 O 2 and LiNi 0.990 Al 0.005 Ti 0.005 O 2 were synthesized by preheating at 400°C for 30 min in air and calcination at 750°C for 36 h in an O 2 stream with excess lithium amount z = 0.10 in Li 1?z Ni 1-y M y O 2 . For these samples, the discharge capacities and discharge capacity degradation rate are compared. LiNiO 2 has the largest discharge capacity at the 20th cycle (n = 20) and the 50th cycle (n = 50). LiNiO 2 and LiNi 0.995 Al 0.005 O 2 have relatively good cycling performances and their discharge capacities at n = 50 are 134 and 123 mAh/g, respectively, at 0.1 C rate. The crystallite sizes and strains were calculated by the Williamson-Hall method with XRD patterns and compared for the samples as prepared and after 50 charge-discharge cycles.

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“…The consolidation of many functions in one SMART device, including wireless internet communications, requires more electricity to run the devices efficiently, and so high-capacity batteries, which imply safety concerns, are urgently needed to fulfill user demands. [3] and their derivatives [4][5][6] are attractive owing to their high reversible capacities of around 200 mA h g À1 . However, their poor thermal stability, caused by loss of oxygen from the host structure at highly delithiated states, should be improved.…”

Section: Introductionmentioning

confidence: 99%

Nanorod and Nanoparticle Shells in Concentration Gradient Core–Shell Lithium Oxides for Rechargeable Lithium Batteries

et al. 2014

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The structure, electrochemistry, and thermal stability of concentration gradient core-shell (CGCS) particles with different shell morphologies were evaluated and compared. We modified the shell morphology from nanoparticles to nanorods, because nanorods can result in a reduced surface area of the shell such that the outer shell would have less contact with the corrosive electrolyte, resulting in improved electrochemical properties. Electron microscopy studies coupled with electron probe X-ray micro-analysis revealed the presence of a concentration gradient shell consisting of nanoparticles and nanorods before and after thermal lithiation at high temperature. Rietveld refinement of the X-ray diffraction data and the chemical analysis results showed no variations of the lattice parameters and chemical compositions of both produced CGCS particles except for the degree of cation mixing (or exchange) in Li and transition metal layers. As anticipated, the dense nanorods present in the shell gave rise to a high tap density (2.5 g cm(-3) ) with a reduced pore volume and surface area. Intimate contact among the nanorods is likely to improve the resulting electric conductivity. As a result, the CGCS Li[Ni0.60 Co0.15 Mn0.25 ]O2 with the nanorod shell retained approximately 85.5% of its initial capacity over 150 cycles in the range of 2.7-4.5 V at 60 °C. The charged electrode consisting of Li0.16 [Ni0.60 Co0.15 Mn0.25 ]O2 CGCS particles with the nanorod shell also displayed a main exothermic reaction at 279.4 °C releasing 751.7 J g(-1) of heat. Due to the presence of the nanorod shell in the CGCS particles, the electrochemical and thermal properties are substantially superior to those of the CGCS particles with the nanoparticle shell.

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Crystal structure and spectroscopic properties of LixNi1 − yTiyO2 and their electrochemical behavior

Cited by 56 publications

References 11 publications

Electrochemical properties of Li1−z (Ni1−y Fe y )1+z O2 synthesized by the combustion method in an air atmosphere

Electrochemical properties of Li1−z (Ni1−y Fe y )1+z O2 synthesized by the combustion method in an air atmosphere

Electrochemical properties of LiNi1−y M y O2 (M=Ni, Ga, Al and/or Ti) cathodes synthesized by the combustion method

Nanorod and Nanoparticle Shells in Concentration Gradient Core–Shell Lithium Oxides for Rechargeable Lithium Batteries

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