High capacity Li2MnSiO4/C nanocomposite prepared by sol–gel method for lithium-ion batteries

Liu, Shuangke; Xu, Jing; Li, Dezhan; Hu, Yun; Liu, Xiang; Xie, Kai

doi:10.1016/j.jpowsour.2012.12.126

Cited by 93 publications

(28 citation statements)

References 23 publications

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“…However for next generation LIB-powered vehicles, development of polyanion cathode materials with higher energy density than LFP cathode as is the case of silicates, Li 2 M SiO 4 ( M = Fe, Mn or Co, etc. ) is sought11121314151617181920. The theoretical specific capacity of Li 2 M SiO 4 is as large as twice (330 mAh/g) that of olivine LiFePO 4 , hence the great potential and opportunity.…”

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confidence: 99%

Rate-dependent phase transitions in Li2FeSiO4 cathode nanocrystals

Wei

Chiu

et al. 2015

Sci Rep

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Nanostructured lithium metal orthosilicate materials hold a lot of promise as next generation cathodes but their full potential realization is hampered by complex crystal and electrochemical behavior. In this work Li2FeSiO4 crystals are synthesized using organic-assisted precipitation method. By varying the annealing temperature different structures are obtained, namely the monoclinic phase at 400°C, the orthorhombic phase at 900°C, and a mixed phase at 700°C. The three Li2FeSiO4 crystal phases exhibit totally different charge/discharge profiles upon delithiation/lithiation. Thus the 400°C monoclinic nanocrystals exhibit initially one Li extraction via typical solid solution reaction, while the 900°C orthorhombic crystals are characterized by unacceptably high cell polarization. In the meantime the mixed phase Li2FeSiO4 crystals reveal a mixed cycling profile. We have found that the monoclinic nanocrystals undergo phase transition to orthorhombic structure resulting in significant progressive deterioration of the material's Li storage capability. By contrast, we discovered when the monoclinic nanocrystals are cycled initially at higher rate (C/20) and subsequently subjected to low rate (C/50) cycling the material's intercalation performance is stabilized. The discovered rate-dependent electrochemically-induced phase transition and stabilization of lithium metal silicate structure provides a novel and potentially rewarding avenue towards the development of high capacity Li-ion cathodes.

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confidence: 99%

Rate-dependent phase transitions in Li2FeSiO4 cathode nanocrystals

Wei

Chiu

et al. 2015

Sci Rep

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“…where, R is gas constant, T is the absolute temperature, A is the electrode area, n is the transfer electron, F is the Faraday's constant, C is the molar concentration of Li + and s w is the Warburg coefficient which can be obtained by following equation: 32,33 Z re f s w u À1/2 (2) where, u is the angular frequency in the low frequency region. As shown in …”

Section: Resultsmentioning

confidence: 99%

The high capacity and excellent rate capability of Ti-doped Li₂MnSiO₄as a cathode material for Li-ion batteries

Wang

Yang

et al. 2015

RSC Adv.

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Ti-doped Li 2 Mn 1Àx Ti x SiO 4 as cathode materials for Li-ion batteries was successfully synthesized by a facile sol-gel method. The addition of Ti to the precursors changed the particle sizes and specific surface areas of Li 2 MnSiO 4 . The galvanostatic charge-discharge measurements showed that Ti-doped Li 2 Mn 1Àx Ti x SiO 4 (x ¼ 0.06, 0.1, 0.2) electrodes delivered high charge capacity of 298, 286, 248 mA h g À1 and discharge capacity of 203, 211, 171 mA h g À1 in the first cycle, much higher than that of undoped Li 2 MnSiO 4 (52 mA h g À1 for charging and 26 mA h g À1 for discharging). Moreover, the Ti-doped samples exhibited good cycling stability and superior rate capability, as compared to that of pristine sample. Even at a high rate (2 C), the Ti-doped Li 2 Mn 1Àx Ti x SiO 4 still maintained high discharge capacities. The remarkable enhancement of battery performance in terms of capacity and rate capability for doped Li 2 Mn 1Àx Ti x SiO 4 was primarily attributed to the decrease of charge transfer resistance and the improvement of the Li + diffusion coefficient.

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“…These can also be integrated during the synthesis of LMS materials. There are several reports from different groups to achieve the theoretical specic capacity including the conventional solid-state route, 15,16 sol-gel combustion, 6,17 pechini sol-gel route,…”

Section: 7mentioning

confidence: 99%

Charge/discharge characteristics of Jahn–Teller distorted nanostructured orthorhombic and monoclinic Li₂MnSiO₄cathode materials

et al. 2017

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Li 2 MnSiO 4 is a promising cathode material for lithium ion rechargeable batteries, however, synthesizing the desired crystallographic phase is challenging. We report the synthesis and electrochemical charge/ discharge studies of carbon coated nanostructured Li 2 MnSiO 4 in orthorhombic and monoclinic crystallographic phases. Li 2 MnSiO 4 has been synthesized using solid state and sol-gel processes in bulk and nano-geometries without and with carbon coatings. The electrochemical performance of these Li 2 MnSiO 4 samples was measured at a C/20 charge/discharge rate within 1.

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High capacity Li2MnSiO4/C nanocomposite prepared by sol–gel method for lithium-ion batteries

Cited by 93 publications

References 23 publications

Rate-dependent phase transitions in Li2FeSiO4 cathode nanocrystals

Rate-dependent phase transitions in Li2FeSiO4 cathode nanocrystals

The high capacity and excellent rate capability of Ti-doped Li₂MnSiO₄as a cathode material for Li-ion batteries

Charge/discharge characteristics of Jahn–Teller distorted nanostructured orthorhombic and monoclinic Li₂MnSiO₄cathode materials

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High capacity Li2MnSiO4/C nanocomposite prepared by sol–gel method for lithium-ion batteries

Cited by 93 publications

References 23 publications

Rate-dependent phase transitions in Li2FeSiO4 cathode nanocrystals

Rate-dependent phase transitions in Li2FeSiO4 cathode nanocrystals

The high capacity and excellent rate capability of Ti-doped Li2MnSiO4as a cathode material for Li-ion batteries

Charge/discharge characteristics of Jahn–Teller distorted nanostructured orthorhombic and monoclinic Li2MnSiO4cathode materials

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Product

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The high capacity and excellent rate capability of Ti-doped Li₂MnSiO₄as a cathode material for Li-ion batteries

Charge/discharge characteristics of Jahn–Teller distorted nanostructured orthorhombic and monoclinic Li₂MnSiO₄cathode materials