Electrochemical characteristics of manganese oxide/carbon composite as a cathode material for Li/MnO2 secondary batteries

Lee, Jungbae; Lee, Jae-Myung; Yoon, Sukeun; Kim, Sang‐Ok; Sohn, Jeong-Soo; Rhee, Kang-In; Sohn, Hun‐Joon

doi:10.1016/j.jpowsour.2008.04.084

Cited by 31 publications

(26 citation statements)

References 19 publications

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“…The correlation between HF formation and dissolution of the active material was reported, and LiPF 6 itself contains a small amount of HF during the manufacturing process. It seems that the carbon coating effectively retards the dissolution of active material from the electrode during cycling and hence, improves capacity retention as reported also by Jung bae Lee et al [29].…”

Section: Resultssupporting

confidence: 57%

Effect of carbon coating process on the structure and electrochemical performance of LiNi0.5Mn0.5O2 used as cathode in Li-ion batteries

Hashem

Abdel-Ghany

Nikolowski

et al. 2009

Ionics

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LiNi 0.5 Mn 0.5 O 2 powder was synthesized by a coprecipitation method. LiOH.H 2 O and coprecipitated [(Ni 0.5 Mn 0.5 )C 2 O 4 ] precursors were mixed carefully together and then calcined at 900°C. Surface modified cathode materials were obtained by coating LiNi 0.5 Mn 0.5 O 2 with a thin layer of amorphous carbon using table sugar and starch as carbon source. Both parent and carbon-coated samples have the characteristic layered structure of LiNi 0.5 Mn 0.5 O 2 as estimated from X-ray diffractometry measurements. Transmission electron microscope showed the presence of C layer around the prepared particles. TGA analysis emphasized and confirmed the presence of C coating around LiNi 0.5 Mn 0.5 O 2 . It is obvious that the carbon coating appears to be beneficial for the electrochemical performance of the LiNi 0.5 Mn 0.5 O 2 . A capacity of about 150 mAh/g is delivered in the voltage range 2.5-4.5 V at current density C/15 for carbon coated LiNi 0.5 Mn 0.5 O 2 in comparison with about 165 mAh/g obtained for carbon free LiNi 0.5 Mn 0.5 O 2 at the same current density and voltage window. About 92% and 82% capacity retention was obtained at 50th cycle for coated LiNi 0.5 Mn 0.5 O 2 using sucrose and starch, respectively; whereas, 75% was retained after only 30th cycle for carbon free LiNi 0.5 Mn 0.5 O 2 . This improvement is mainly attributed to the presence of thin layer of carbon layer that encapsulate the nanoparticles and improve the conductivity and the electrochemical performance of LiNi 0.5 Mn 0.5 O 2 .

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Section: Resultssupporting

confidence: 57%

Effect of carbon coating process on the structure and electrochemical performance of LiNi0.5Mn0.5O2 used as cathode in Li-ion batteries

Hashem

Abdel-Ghany

Nikolowski

et al. 2009

Ionics

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“…The galvanostatic charge-discharge profiles are similar to the b-MnO 2 as cathode materials in Li-ion batteries. 24 b-MnO 2 nanorods delivered a high initial discharge capacity of 350 mAh g À1 . Although the discharge capacity decreased gradually upon cycling, it still maintained a high value after 100 cycles.…”

Section: Structural Characterization Of B-mno 2 Nanorodsmentioning

confidence: 99%

β-MnO2 nanorods with exposed tunnel structures as high-performance cathode materials for sodium-ion batteries

Ahn

Wang

2013

NPG Asia Mater

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Sodium-ion batteries are being considered as a promising system for stationary energy storage and conversion, owing to the natural abundance of sodium. It is important to develop new cathode and anode materials with high capacities for sodium-ion batteries. Herein, we report the synthesis of b-MnO 2 nanorods with exposed tunnel structures by a hydrothermal method. The as-prepared b-MnO 2 nanorods have exposed {111} crystal planes with a high density of (1 Â 1) tunnels, which leads to facile sodium ion (Na-ion) insertion and extraction. When applied as cathode materials in sodium-ion batteries, b-MnO 2 nanorods exhibited good electrochemical performance with a high initial Na-ion storage capacity of 350 mAh g À1 . b-MnO 2 nanorods also demonstrated a satisfactory high-rate capability as cathode materials for sodium-ion batteries. Keywords: b-MnO 2 ; nanorods; cathode material; tunnel structure; sodium-ion batteries INTRODUCTION Sodium-ion (Na-ion) batteries have recently been considered as an alternative battery system for large-scale energy storage and conversion due to the availability of low-cost and widespread terrestrial reserves of sodium mineral salts. 1 Na-ion batteries share many similarities with lithium-ion batteries (Li-ion batteries), such as an intercalating cathode and anode, a nonaqueous electrolyte and an ion shuttle mechanism. Computational studies on the voltage, stability and diffusion barrier of Na-ion and Li-ion materials indicate that Naion systems are competitive with Li-ion systems. 2 However, the large ionic size of sodium (1.02 Å versus lithium (0.76 Å )) limits the choice of electrode materials for Na-ion batteries. Many cathode materials have been investigated for Na-ion batteries, including phosphate polyanion materials (NaFePO 4 ), 3,4 Na 4 Mn 9 O 18 , 5-7 fluoride-based cathode materials-NaMF 3 (M ¼ Fe, Mn, V and Ni), 8,9 fluorophosphates, 10,11 fluorosulfates, 12 À14 and layered transition metal oxides, such as P2-Na x CoO 2 , 15,16 P2-Na 2/3 (Fe 1/2 Mn 1/2 )O 2,

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“…Another reason for the poorly resolved Raman spectrum could be that a rather random distribution of K + in the tunnels is blocking and coupling some vibrational modes. a hydrothermal process based on KMnO 4 and MnSO 4 as the reactants [55][56]. In this work, we have obtained the same sample morphology of α-MnO 2 crystalline nanorods using a facile and low-cost synthetic process.…”

Section: Structural Propertiesmentioning

confidence: 94%

“…Subramanian [20] used a hydrothermal reaction at 140 °C for various reaction times (1-18 h) to synthesize MnO 2 nanorods using MnSO 4 ·H 2 O and KMnO 4 as starting materials. Xu et al [21] prepared hollow spheres with a highly loose and mesoporous cluster structure of α-MnO 2 using KMnO 4 , sulfuric acid and Cu scrap. Nanowhiskers and nanorods of MnO 2 were synthesized at 120 °C by a hydrothermal method using KMnO 4 and HNO 3 [22].…”

Section: Introductionmentioning

confidence: 99%

“…Nanowhiskers and nanorods of MnO 2 were synthesized at 120 °C by a hydrothermal method using KMnO 4 and HNO 3 [22]. Liu et al [23] succeeded to synthesize amorphous and spherical MDOs using KMnO 4 , ethanol and sulfuric acid at pH=2 with particle sizes of about 100 nm at 60 °C. Also, the same reagents were used to synthesize α-MnO 2 nanowires with controllable size via a low-temperature hydrothermal route with a subsequent heat treatment, which showed promising electrochemical properties [24].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Green synthesis of nanosized manganese dioxide as positive electrode for lithium-ion batteries using lemon juice and citrus peel

Hashem

Abuzeid

Kaus

et al. 2018

Electrochimica Acta

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Electrochemical characteristics of manganese oxide/carbon composite as a cathode material for Li/MnO2 secondary batteries

Cited by 31 publications

References 19 publications

Effect of carbon coating process on the structure and electrochemical performance of LiNi0.5Mn0.5O2 used as cathode in Li-ion batteries

Effect of carbon coating process on the structure and electrochemical performance of LiNi0.5Mn0.5O2 used as cathode in Li-ion batteries

β-MnO2 nanorods with exposed tunnel structures as high-performance cathode materials for sodium-ion batteries

Green synthesis of nanosized manganese dioxide as positive electrode for lithium-ion batteries using lemon juice and citrus peel

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