Preparation of LiMn0.4Fe0.6PO4/C Composite by A New Route Combining Solid-state Reaction with Hydrothermal Synthesis

doi:10.3724/SP.J.1077.2014.13672

Abstract

Abstract: The olivine type LiMn_0.4Fe_0.6PO₄ was synthesized via a new route that combining solid-state reaction with hydrothermal synthesis from Li₂CO₃, FeC₂O₄·2H₂O, MnCO₃ and NH₄H₂PO₄ (molar ratio of 5:6:4:10). The structure, particle size and surface morphology of these cathode active materials were investigated by XRD, SEM and TEM techniques. The electrochemical properties of LiMn_0.4Fe_0.6PO₄/C as cathode in lithium-ion cells were tested via cyclic voltammetry and galvanostatic charge-discharge measurements. Phase-pure particles of size ~120 nm are prepared with a conductive, thin web of carbon surrounding them. Cyclic voltammetry shows the active voltage range of the material which consists of two pairs of redox peaks: 3.5 V corresponding to Fe³⁺/Fe²⁺ reaction and 4.0 V corresponding to Mn³⁺/Mn²⁺ reaction. An initial discharge capacity of 160 mAh/g at 0.1C, 143 mAh/g and a stable cycling property at 0.5C are obtained for the LiMn_0.4Fe_0.6PO₄/C composite.

Key words: Li-ion battery, solid-state reaction, hydrothermal synthesis, electrochemical property, electron microscopy

CLC Number:

TQ174

LI Jian, YAO Shu-Heng, ZHOU Hong-Ming, GENG Wen-Jun. Preparation of LiMn_0.4Fe_0.6PO₄/C Composite by A New Route Combining Solid-state Reaction with Hydrothermal Synthesis[J]. Journal of Inorganic Materials, 2014, 29(4): 443-448.

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Preparation of LiMn_0.4Fe_0.6PO₄/C Composite by A New Route Combining Solid-state Reaction with Hydrothermal Synthesis

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