The doping effect on the crystal structure and electrochemical properties of LiMnxM1−xPO4 (M=Mg, V, Fe, Co, Gd)

Yang, Gang; Ni, Huan; Liu, Haidong; Gao, Peng; Ji, Hongmei; Roy, Soumyajit; Pinto, João; Jiang, Xuefan

doi:10.1016/j.jpowsour.2011.01.064

Cited by 150 publications

(82 citation statements)

References 25 publications

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“…This phenomenon has been observed in other cations doped LiMnPO 4 such as Mg doping and Zn doping [29,30]. In addition, although the electrochemical performance of our optimal LiMn 0.975 V 0.025 PO 4 / C is not so high, it is better than those of V-doped LiMnPO 4 reported by other groups [12,13]. Fig.…”

Section: Resultssupporting

confidence: 76%

“…However, performance of LiMnPO 4 is greatly limited by its extremely low electron and ion conductivity. So far, great efforts have been devoted to overcome these drawbacks, and cation doping is one of the effective ways to improve the performance of LiMnPO 4 [8][9][10][11][12]. In the year of 2011, Yang et al [12] first reported that substitution of Mn 2 þ by 5 at% V 3 þ in LiMnPO 4 did not produce detectable impurity when synthesized by a solid-state reaction route at 700 1C and could improve its electrochemical performance.…”

Section: Introductionmentioning

confidence: 99%

“…So far, great efforts have been devoted to overcome these drawbacks, and cation doping is one of the effective ways to improve the performance of LiMnPO 4 [8][9][10][11][12]. In the year of 2011, Yang et al [12] first reported that substitution of Mn 2 þ by 5 at% V 3 þ in LiMnPO 4 did not produce detectable impurity when synthesized by a solid-state reaction route at 700 1C and could improve its electrochemical performance. Recently, Su et al [13] also reported the improved performance of V 3 þ -doped LiMnPO 4 , but impurity phase of Li 3 V 2 (PO 4 ) 3 began to appear at x ¼ 0.05 when LiMn 1 À x V x PO 4 samples were synthesized via a conventional solid-state method at 650 1C.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis of vanadium doped LiMnPO4 by an improved solid-state method

Dai

Fang

Yang

et al. 2015

Ceramics International

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Section: Resultssupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of vanadium doped LiMnPO4 by an improved solid-state method

Dai

Fang

Yang

et al. 2015

Ceramics International

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“…Figure 7b compares the cycling stability between LMP-1-600 and LMP-3-600 at different current rates. Note that the LMP-3-600 sample shows a slow capacity fade at C/10, similar to the phenomenon observed in [31].The exact reason for the capacity fade at a low current is unclear yet. At a high current rate, however, the LMP-3-600 sample exhibits a good cycling stability.…”

Section: Resultssupporting

confidence: 75%

Oleic acid-assisted preparation of LiMnPO4 and its improved electrochemical performance by Co doping

Zhao

Cao

Xie

et al. 2011

J Solid State Electrochem

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LiMnPO 4 , with a particle size of 50-150 nm, was prepared by oleic acid-assisted solid-state reaction. The materials were characterized by X-ray diffraction, field emission scanning electron microscopy, and transmission electron microscopy. The electrochemical properties of the materials were investigated by galvanostatic cycling. It was found that the introduction of oleic acid in the precursor led to smaller particle size and more homogeneous size distribution in the final products, resulting in improved electrochemical performance. The electrochemical performance of the sample could be further enhanced by Co doping. The mechanism for the improvement of the electrochemical performance was investigated by Li-ion chemical diffusion coefficientD Li À Á and electrochemical impedance spectroscopy measurements. The results revealed that theD Li values of LiMnPO 4 measured by cyclic voltammetry method increase from 9.2×10 −18 to 3.0× 10 −17 cm 2 s −1 after Co doping, while the charge transfer resistance (R ct ) can be decreased by Co doping.

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“…To the best of our knowledge, this is the first theoretical study reporting the structural and electronic properties as well as the lithium diffusion activation barriers of LiMnPO 4 doped with cobalt and nickel. Few experimental studies [14,26,27] have been devoted to Co-and Ni-doped LiMnPO 4 , and our data can be useful to better understand and support the experimental findings.…”

Section: Introductionmentioning

confidence: 57%

Doping LiMnPO4 with Cobalt and Nickel: A First Principle Study

et al. 2017

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Abstract:A density functional theory (DFT) study has been carried out on transition metal phosphates with olivine structure and formula LiMPO 4 (M = Fe, Mn, Co, Ni) to assess their potential as cathode materials in rechargeable Li-ion batteries based on their chemical and structural stability and high theoretical capacity. The investigation focuses on LiMnPO 4 , which could offer an improved cell potential (4.1 V) with respect to the reference LiFePO 4 compound, but it is characterized by poor lithium intercalation/de-intercalation kinetics. Substitution of cations like Co and Ni in the olivine structure of LiMnPO 4 was recently reported in an attempt to improve the electrochemical performances. Here the electronic structure and lithium intercalation potential of Ni-and Co-doped LiMnPO 4 were calculated in the framework of the Hubbard U density functional theory (DFT+U) method for highly correlated materials. Moreover, the diffusion process of lithium in the host structures was simulated, and the activation barriers in the doped and pristine structures were compared. Our calculation predicted that doping increases Li insertion potential while activation barriers for Li diffusion remain similar to the pristine material. Moreover, Ni and Co doping induces the formation of impurity states near the Fermi level and significantly reduces the band gap of LiMnPO 4 .

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The doping effect on the crystal structure and electrochemical properties of LiMnxM1−xPO4 (M=Mg, V, Fe, Co, Gd)

Cited by 150 publications

References 25 publications

Synthesis of vanadium doped LiMnPO4 by an improved solid-state method

Synthesis of vanadium doped LiMnPO4 by an improved solid-state method

Oleic acid-assisted preparation of LiMnPO4 and its improved electrochemical performance by Co doping

Doping LiMnPO4 with Cobalt and Nickel: A First Principle Study

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