Rate performance and structural change of Cr-doped LiFePO4/C during cycling

Shin, Hyungcheol; Park, Sung Bin; Jang, Hae‐Dong; Chung, Kyung Yoon; Cho, Won Il; Kim, Chang Sam; Cho, Byung Won

doi:10.1016/j.electacta.2008.06.005

Cited by 124 publications

(66 citation statements)

References 15 publications

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“…The higher D of LiFe 0.9 Cr 0.1 PO 4 /C is due to the formation of defects created by Cr dopant and fast phase transformation. 13 D of LiFe 0.9 Cr 0.1 PO 4 /C are on the order of 10 −13 cm/s 2 which are similar to the true diffusion coefficient 9 of phase transformation electrodes. Mathematical expression of Eq.…”

Section: (10)mentioning

confidence: 51%

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Prediction of Lithium Diffusion Coefficient and Rate Performance by using the Discharge Curves of LiFePO₄Materials

Yu¹,

Park

Jang³

et al. 2011

Bulletin of the Korean Chemical Society

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The lithium ion diffusion coefficients of bare, carbon-coated and Cr-doped LiFePO 4 were obtained by fitting the discharge curves of each half cell with Li metal anode. Diffusion losses at discharge curves were acquired with experiment data and fitted to equations. Theoretically fitted equations showed good agreement with experimental results. Moreover, theoretical equations are able to predict lithium diffusion coefficient and discharge curves at various discharge rates. The obtained diffusion coefficients were similar to the true diffusion coefficient of phase transformation electrodes. Lithium ion diffusion is one of main factors that determine voltage drop in a half cell with LiFePO 4 cathode and Li metal anode. The high diffusion coefficient of carbon-coated and Cr-doped LiFePO 4 resulted in better performance at the discharge process. The performance at high discharge rate was improved much as diffusion coefficient increased.

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Section: (10)mentioning

confidence: 51%

“…The LiFePO 4 /C and Cr-doped LiFePO 4 showed excellent rate performance by facilitating the phase transformation and increasing conductivity. 13 Diffusion coefficient of LiFe 0.9 Cr 0.1 PO 4 /C was supposed to be improved. Diffusion coefficients were obtained by fitting discharge curves with experimental data.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Lithium Diffusion Coefficient and Rate Performance by using the Discharge Curves of LiFePO₄Materials

Yu¹,

Park

Jang³

et al. 2011

Bulletin of the Korean Chemical Society

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“…Mechanochemical process was performed in a similar manner to our previous works using a planetary mill (FRITSCH Pulverisette 5, 300 rpm, 3 h), followed by the heat treatment in a box furnace at 600°C for 5 h. [7][8][9][10][11] The ball-to-powder weight ratio was optimized at the ratio of 20:1. Mn 2 V 2 O 7 , Li 2 CO 3 (Aldrich), and (NH 4 ) 2 HPO 4 (Aldrich) were mixed with the stoichiometric ratio of 1:2.5:5 to yield the Li 3 V 2 (PO 4 ) 3 -LiMnPO 4 composite with a mole ratio of Li 3 V 2 (PO 4 ) 3 : LiMnPO 4 = 1:2.…”

Section: Methodsmentioning

confidence: 99%

Synthesis and Electrochemical Properties of Li₃V₂(PO₄)₃-LiMnPO₄Composite Cathode Material for Lithium-ion Batteries

Yun

Kim

Cho

et al. 2013

Bulletin of the Korean Chemical Society

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Carbon-coated Li 3 V 2 (PO 4 ) 3 -LiMnPO 4 composite cathode materials are first reported in this work, prepared by the mechanochemical process with a complex metal oxide as the precursor and sucrose as the carbon source. X-ray diffraction pattern of the composite material indicates that both olivine LiMnPO 4 and monoclinic Li 3 V 2 (PO 4 ) 3 co-exist. We further investigated the electrochemical properties of our Li 3 V 2 (PO 4 ) 3 -LiMnPO 4 composite cathode materials using galvanostatic charging/discharging tests, where our Li 3 V 2 (PO 4 ) 3 -LiMnPO 4 composite electrode materials exhibit the charge/discharge efficiency of 91.9%, while Li 3 V 2 (PO 4 ) 3 and LiMnPO 4 exhibit the efficiency of 87.7 and 86.7% in the first cycle. The composites display unique electrochemical performances in terms of overvoltage and cycle stability, displaying a reduced gap of 141.6 mV between charge and discharge voltage and 95.0% capacity efficiency after 15 th cycles.

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“…It accelerates the Li ion diffusivity which increases the kinetics of the phase transformation between heterosite (charged phase) and triphylite (discharged phase) during the chargedischarge cycles [31].…”

Section: Electrochemical Properties Of Synthesized Lifepomentioning

confidence: 99%

Impact of incorporation of chromium on electrochemical properties of LiFePO4/C for Li-ion batteries

Naik

Zhou

Gao

et al. 2015

Materials Science-Poland

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LiFe 0.95 Cr 0.05 PO 4 /C was successfully synthesized by one-step solid-state reaction using a single mode microwave reactor. The effect of incorporation of chromium on LiFePO 4 lattice parameters was systematically investigated by X-ray diffraction. Surface analysis was done by scanning electron microscopy and transmission electron microscopy. The ratio of amorphous to graphitic carbon was determined from Raman spectroscopic data. The influence of chromium incorporation on electrochemical properties was studied by recording charge/discharge cycles combined with electrochemical impedance spectroscopy (EIS) and cyclic voltammetry. It was found that Cr incorporation significantly enhanced the electrochemical performance of LiFePO 4 at all current densities up to 10 C. LiFe 0.95 Cr 0.05 PO 4 /C prepared exhibited the best performance with an initial specific discharge capacity of 157.7, 144.8, 138.3, 131.0, 124.1 and 111.1 mAh·g −1 at 0.1 C, 0.5 C, 1.0 C, 2.0 C, 5 C and 10 C, respectively. The doped sample displayed excellent capacity retention, which was substantially superior than that of pristine LiFePO 4 /C at a higher current rate.

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Rate performance and structural change of Cr-doped LiFePO4/C during cycling

Cited by 124 publications

References 15 publications

Prediction of Lithium Diffusion Coefficient and Rate Performance by using the Discharge Curves of LiFePO₄Materials

Prediction of Lithium Diffusion Coefficient and Rate Performance by using the Discharge Curves of LiFePO₄Materials

Synthesis and Electrochemical Properties of Li₃V₂(PO₄)₃-LiMnPO₄Composite Cathode Material for Lithium-ion Batteries

Impact of incorporation of chromium on electrochemical properties of LiFePO4/C for Li-ion batteries

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Rate performance and structural change of Cr-doped LiFePO4/C during cycling

Cited by 124 publications

References 15 publications

Prediction of Lithium Diffusion Coefficient and Rate Performance by using the Discharge Curves of LiFePO4Materials

Prediction of Lithium Diffusion Coefficient and Rate Performance by using the Discharge Curves of LiFePO4Materials

Synthesis and Electrochemical Properties of Li3V2(PO4)3-LiMnPO4Composite Cathode Material for Lithium-ion Batteries

Impact of incorporation of chromium on electrochemical properties of LiFePO4/C for Li-ion batteries

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Prediction of Lithium Diffusion Coefficient and Rate Performance by using the Discharge Curves of LiFePO₄Materials

Prediction of Lithium Diffusion Coefficient and Rate Performance by using the Discharge Curves of LiFePO₄Materials

Synthesis and Electrochemical Properties of Li₃V₂(PO₄)₃-LiMnPO₄Composite Cathode Material for Lithium-ion Batteries