In-situ controllable synthesis and performance investigation of carbon-coated monoclinic and hexagonal LiMnBO3 composites as cathode materials in lithium-ion batteries

The phase controllable synthesis of carbon-coated monoclinic LiMnBO3 (m-LiMnBO3/C) and hexagonal LiMnBO3 (h-LiMnBO3/C) composites has been achieved via an in-situ carbothermal solid state synthesis approach only through the modulation of the reaction temperature. The h-LiMnBO3/C particles keep high...

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Bibliographic Details
Published in:Journal of power sources 2013-08, Vol.236, p.54-60
Main Authors: Li, Shouli, Xu, Liqiang, Li, Guangda, Wang, Meng, Zhai, Yanjun
Format: Article
Language:English
Subjects:
Applied sciences
Borates
Carbon-carbon composites
Cathodes
Composite materials
Direct energy conversion and energy accumulation
Discharge
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Electrochemical impedance spectroscopy
Exact sciences and technology
Lithium-ion batteries
Lithium-ion battery
Materials
Particulate composites
Phase control
Stability
Synthesis
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Summary:The phase controllable synthesis of carbon-coated monoclinic LiMnBO3 (m-LiMnBO3/C) and hexagonal LiMnBO3 (h-LiMnBO3/C) composites has been achieved via an in-situ carbothermal solid state synthesis approach only through the modulation of the reaction temperature. The h-LiMnBO3/C particles keep high cycle stability and retain 86.5% of the initial discharge capacity (90.7 mAh g−1) after 40 cycles at 0.05 C (11 mA g−1) within 1.25–4.80 V, while the m-LiMnBO3/C composites display a first discharge capacity of 107 mAh g−1 and a capacity retention rate of 80.8% after 40 cycles. The rate performance of m-LiMnBO3/C has been tested for the first time, which has a capacity of 74.4 mAh g−1 at the discharge rate of 0.1 C (22 mA g−1). The enhanced electrochemical performance might be largely attributed to the uniformly coated carbon layers and the reduced particle size of the as-obtained products. The electrochemical impedance spectroscopy (EIS) analysis reveals that the smaller charge transfer resistance (Rct) and higher electronic conductivity of the LiMnBO3/C composites were obtained at 55 °C than those at 25 °C. The as-obtained LiMnBO3/C composites with controllable phases and high performances enable their promising applications as cathode materials for lithium-ion rechargeable batteries. [Display omitted] Carbon-coated LiMnBO3 composites with monoclinic and hexagonal phases have been controllable prepared through a facile one-pot approach in the temperature range of 500–750 °C. The initial discharge capacity of m-LiMnBO3/C was 107 mAh g−1 at 11 mA g−1 within the window of 1.25–4.80 V, and 74.4 mAh g−1 could be retained if the current density was increased to 22 mA g−1. The initial discharge capacity of h-LiMnBO3/C particles was 90.7 mAh g−1, and its discharge capacity retention ratio was 86.5% after 40 cycles. The electrochemical impedance spectroscopy results of the products illustrated the better electrochemical performance of m-LiMnBO3/C than that of h-LiMnBO3/C at 55 °C. The overall results reveal that these two kinds of materials can be used as promising cathode materials for lithium-ion rechargeable batteries. ► The m-LiMnBO3/C and h-LiMnBO3/C composites have been selectively and conveniently prepared. ► The long cycle stability of h-LiMnBO3/C is firstly reported in this study. ► It is the first time to report the rate performance of m-LiMnBO3/C composite.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2013.02.027