Improved Electrochemical Investigation of Combustion Synthesized Cd-doped LiCoO&lt;sub&gt;2&lt;/sub&gt; Powders

Valanarasu, S.; Chandramohan, R.; Thirumalai, Jagannathan; Vijayan, T. A.

doi:10.3329/jsr.v2i3.3877

Cited by 9 publications

(3 citation statements)

References 18 publications

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“…After doping with Mg, the capacity increases around 50 mA h g –1 which may be due to the increased structural stability in the high voltage region during cycling, which is favorable for lithium intercalation and deintercalation due to the enlargement of c-lattice. The Mg 2+ ions act as pillars (pillaring effect , of Mg 2+ ions increase the structural stability) and protect the crumbling of CoO 2 interslab layers, enhancing the lithium ion diffusions (it has similar ionic radii to that of Li + ions), which eventually increases the discharge capacity. Complete extraction of lithium ions from the tetrahedral site requires high potential (> 4.2 V) and the mixed doping avoids structural deterioration.…”

Section: Resultsmentioning

confidence: 99%

High-Performing LiMg_xCu_yCo_1–x–yO₂ Cathode Material for Lithium Rechargeable Batteries

Nithya

Thirunakaran

Sivashanmugam

et al. 2012

ACS Appl. Mater. Interfaces

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Sustainable power requirements of multifarious portable electronic applications demand the development of high energy and high power density cathode materials for lithium ion batteries. This paper reports a method for rapid synthesis of a cobalt based layered cathode material doped with mixed dopants Cu and Mg. The cathode material exhibits ordered layered structure and delivers discharge capacity of ∼200 mA h g(-1) at 0.2C rate with high capacity retention of 88% over the investigated 100 cycles.

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Section: Resultsmentioning

confidence: 99%

High-Performing LiMg_xCu_yCo_1–x–yO₂ Cathode Material for Lithium Rechargeable Batteries

Nithya

Thirunakaran

Sivashanmugam

et al. 2012

ACS Appl. Mater. Interfaces

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“…Furthermore, the electronic conductivity of LFP/(C+CdO) (1.9 × 10 −3 S cm −1 ) is much higher than that of LFP/C (<10 −6 S cm −1 ), which is consistent with the effect of Cd-incorporation on the electronic conductivity of LiCoO 2 . 26 Thus, the improved electrochemical performance of LFP/C by Cdincorporation may be attributed to the improved structural stability, the decreased charge-transfer resistance, and the increased electronic conductivity.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Electrochemical Performance of LiFePO₄Cathode Material Promoted by CdO and Carbon Co-Coating

Yang

Peng

Zhang

et al. 2012

J. Electrochem. Soc.

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A novel CdO and carbon co-coated LiFePO 4 (LFP) cathode material has been synthesized, and the effect of CdO on the physicochemical properties and electrochemical performance has been investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-Ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), X-ray absorption spectroscopy (XAS), transmission electron microscopy (TEM) and electrochemical measurements. The results show that the LFP/(C+CdO) particles are coated with a mixed layer (about 2∼3 nm) combined by amorphous carbon and CdO. Compared to the LFP/C electrode, the capacity retention ratio and high C-rate performance for LFP/(C+CdO) have been effectively improved, which is due to the enhanced structural stability, the reduced charge-transfer resistance, and the increased electronic conductivity. Therefore, the CdO and carbon co-coating is an effective surface modification technique.With the emergence of energy crisis and environmental pollution, electric vehicles (EVs) or hybrid electric vehicles (HEVs) has aroused more and more concern. Lithium-ion batteries (LIBs) are the key power source for EVs or HEVs. LiFePO 4 (LFP) is regarded as one of the most promising cathode materials due to its high theoretical capacity (170 mAh g −1 ), low cost, non-toxicity, and environmental friendliness. 1,2 However, its poor electronic conductivity and low ionic diffusion lead to a relatively low reversible capacity and poor rate performance. Accordingly, tremendous efforts have been made to improve the performance of LiFePO 4 , such as particle size reduction, 3-5 doping, 6-9 surface modification (i.e., carbon coating, conductive polymer, metal oxide, etc.), 10-18 and so on.Recently, Zhang 19 has reported that charge transfer between particle surface and current collector plays a crucial role on the high-rate performance of LiFePO 4 . Therefore, it is possible to enhance the electrochemical performance of LiFePO 4 by surface modification. Carbon coating has been proved to be a most effective and simple method of surface modification. However, high carbon in the final product will decrease not only tap density but also energy density. Whereas, metal oxide (RuO 2 , 15 ZrO 2 , 16 ZnO, 18 SiO 2 , 17,20 V 2 O 3 , 21 CuO, 22 etc.) coating combined with carbon not only modifies carbon layer to decrease the charge transfer resistance, but also alleviates ferrous dissolution in the electrolyte to improve structural stability, thus effectively improving the electrochemical performance of LiFePO 4 , [14][15][16]18,21,22 For example, Hu et al. 15 reported the nanometer-sized RuO 2 can repair the incomplete carbon network as well as improve the kinetics and rate capability of the composite significantly. As the same, Liu et al. 16 improved the electrochemical dynamics on the LiFePO 4 /C electrode/electrolyte interface by coating ZrO 2 nanolayer. León et al. 18 precipitated ZnO films with a thickness of 2 nm on the surface of LiFePO 4 /C particles and obtained a significantly enhanced capaci...

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“…Much effort has been made to improve the electrochemical performance of LFS, such as incorporating conductive carbon10121314151617, reducing particle size18192021, and doping metal ion2223242526272829. The positive effect of Cd-incorporation on the electrochemical performance of some cathode materials (i.e., LiFePO 4 and LiCoO 2 ) has been confirmed in previous works3031, however, there is no report about Cd-modification for LFS so far. Furthermore, it is still controversial whether metal ion is doped into the crystal structure or exists in the form of metallic oxide3233343536.…”

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confidence: 94%

Systematic investigation on Cadmium-incorporation in Li2FeSiO4/C cathode material for lithium-ion batteries

Zhang

Duan

Yang

et al. 2014

Sci Rep

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Cadmium-incorporated Li2FeSiO4/C composites have been successfully synthesized by a solid-state reaction assisted with refluxing. The effect and mechanism of Cd-modification on the electrochemical performance of Li2FeSiO4/C were investigated in detail by X-ray powder diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, Raman spectra, transmission electron microscopy, positron annihilation lifetime spectroscopy and Doppler broadening spectrum, and electrochemical measurements. The results show that Cd not only exists in an amorphous state of CdO on the surface of LFS particles, but also enters into the crystal lattice of LFS. Positron annihilation lifetime spectroscopy and Doppler broadening spectrum analyses verify that Cd-incorporation increases the defect concentration and the electronic conductivity of LFS, thus improve the Li+-ion diffusion process. Furthermore, our electrochemical measurements verify that an appropriate amount of Cd-incorporation can achieve a satisfied electrochemical performance for LFS/C cathode material.

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Improved Electrochemical Investigation of Combustion Synthesized Cd-doped LiCoO<sub>2</sub> Powders

Cited by 9 publications

References 18 publications

High-Performing LiMg_xCu_yCo_1–x–yO₂ Cathode Material for Lithium Rechargeable Batteries

High-Performing LiMg_xCu_yCo_1–x–yO₂ Cathode Material for Lithium Rechargeable Batteries

Enhanced Electrochemical Performance of LiFePO₄Cathode Material Promoted by CdO and Carbon Co-Coating

Systematic investigation on Cadmium-incorporation in Li2FeSiO4/C cathode material for lithium-ion batteries

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Improved Electrochemical Investigation of Combustion Synthesized Cd-doped LiCoO<sub>2</sub> Powders

Cited by 9 publications

References 18 publications

High-Performing LiMgxCuyCo1–x–yO2 Cathode Material for Lithium Rechargeable Batteries

High-Performing LiMgxCuyCo1–x–yO2 Cathode Material for Lithium Rechargeable Batteries

Enhanced Electrochemical Performance of LiFePO4Cathode Material Promoted by CdO and Carbon Co-Coating

Systematic investigation on Cadmium-incorporation in Li2FeSiO4/C cathode material for lithium-ion batteries

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High-Performing LiMg_xCu_yCo_1–x–yO₂ Cathode Material for Lithium Rechargeable Batteries

High-Performing LiMg_xCu_yCo_1–x–yO₂ Cathode Material for Lithium Rechargeable Batteries

Enhanced Electrochemical Performance of LiFePO₄Cathode Material Promoted by CdO and Carbon Co-Coating