A novel carbon-coated LiCoO2 as cathode material for lithium ion battery

Cao, Qingqing; Zhang, H.P.; Wang, G.J.; Xia, Qiang; Wu, Yuping; Wu, Haoyu

doi:10.1016/j.elecom.2007.01.017

Cited by 312 publications

(92 citation statements)

References 19 publications

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“…Furthermore, we calculated the lithium ion diffusion coefficient from the EIS plots in the low-frequency region according to the following equations [48]:…”

Section: Resultsmentioning

confidence: 99%

Synthesis and electrochemical performance of Sn-doped LiNi0.5Mn1.5O4 cathode material for high-voltage lithium-ion batteries

Hao

et al. 2017

Sci. China Mater.

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LiNi0.5Mn1.5−xSnxO4 (0 ≤ x ≤ 0.1) cathode materials with uniform and fine particle sizes were successfully synthesized by a two-step calcination of solid-state reaction method. As the cathode materials for lithium ion batteries, the LiNi0.5Mn1.48Sn0.02O4 shows the highest specific capacity and cycle stability. In the potential range of 3.5-4.9 V at room temperature, LiNi0.5Mn1.48Sn0.02O4 composite material shows a discharge capacity of more than 117 mA h g −1 at 0.1 C, while the corresponding discharge capacity of undoped LiNi0.5Mn1.5O4 is only 101 mA h g −1 . Moreover, in cycle performance, all the LiNi0.5Mn1.5−xSnxO4 (0 ≤ x ≤ 0.1) samples show better capacity retention than the undoped LiNi0.5Mn1.5O4 at 1 C rate after 100 cycles. Especially, for the LiNi0.5Mn1.5O4, the discharge capacity after 100 cycles is 90 mA h g −1 , while the corresponding discharge capacities of the undoped LiNi0.5Mn1.5O4 is only 56.1 mA h g −1 . The significantly enhanced DLi + and the enlarged electronic conductivity make the Sn-doped spinel LiNi0.5Mn1.5O4 material present even more excellent electrochemical performances. These results reveal that Sn-doping is an effective way to improve electrochemical performances of LiNi0.5Mn1.5O4.

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“…Furthermore, we calculated the lithium ion diffusion coefficient from the EIS plots in the low-frequency region according to the following equations [48]:…”

Section: Resultsmentioning

confidence: 99%

Synthesis and electrochemical performance of Sn-doped LiNi0.5Mn1.5O4 cathode material for high-voltage lithium-ion batteries

Hao

et al. 2017

Sci. China Mater.

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“…The determination of diffusion characteristics is dependent on the solution of the Warburg impedance response, and the diffusion coefficient (D Li) of lithium ion can be calculated from the plots in the low-frequency region according to the following equations [32,33]:…”

Section: Resultsmentioning

confidence: 99%

Kinetic study on LiFePO4-positive electrode material of lithium-ion battery

Zhu

Xie

Zhu

et al. 2011

Ionics

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LiFePO 4 -positive electrode material was successfully synthesized by a solid-state method, and the effect of storage temperatures on kinetics of lithium-ion insertion for LiFePO 4 -positive electrode material was investigated by electrochemical impedance spectroscopy. The chargetransfer resistance of LiFePO 4 electrode decreases with increasing the storage temperatures. This suggests that it has a high electrochemical activity at high temperature. The diffusion coefficient of lithium ion is greatly increased with increasing the storage temperatures, indicating that the kinetics of Li + and electron transfer into the electrodes were much fast at high storage temperature.

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“…9(a) and (b) represent the Nyquist plots of the four electrodes. All the profiles after 5 cycles exhibit one semicircle (indicates Li + migration resistance through the process of chargetransfer and solid electrolyte interface), accompanied with an oblique line (reflects the solid-state diffusion of Li + into the bulk cathode materials) in the low frequency region [31,32]. The EIS was simulation fitted by Z-view software based on the equivalent circuit model.…”

Section: Galvanostatic Charge/discharge Studiesmentioning

confidence: 99%

“…As shown in Table 1, the charge-transfer resistance of LNMOF is much higher than that of NCM-LMNOF, revealing that the latter possesses better conductivity and lower electrochemical polarization than the former. The lithium ion's diffusion coefficient (D Li ) can be computed from the profiles in the low-frequency zone using the following equations [31,32]:…”

Section: Galvanostatic Charge/discharge Studiesmentioning

confidence: 99%