Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Layered NaxMnO2+z in sodium ion batteries-influence of morphology on cycle performance
AU - Bucher, Nicolas
AU - Hartung, Steffen
AU - Nagasubramanian, Arun
AU - Cheah, Yan Ling
AU - Hoster, Harry E.
AU - Madhavi, Srinivasan
PY - 2014/6/11
Y1 - 2014/6/11
N2 - Due to its potential cost advantage, sodium ion batteries could become a commercial alternative to lithium ion batteries. One promising cathode material for this type of battery is layered sodium manganese oxide. In this investigation we report on the influence of morphology on cycle performance for the layered NaxMnO2+z. Hollow spheres of NaxMnO2+z with a diameter of similar to 5 mu m were compared to flake-like NaxMnO2+z. It was found that the electrochemical behavior of both materials as measured by cyclic voltammetry is comparable. However, the cycle stability of the spheres is significantly higher, with 94 mA h g(-1) discharge capacity after 100 cycles, as opposed to 73 mA h g(-1) for the flakes (50 mA g(-1)). The better stability can potentially be attributed to better accommodation of volume changes of the material due to its spherical morphology, better contact with the added conductive carbon, and higher electrode/electrolyte interface owing to better wetting of the active material with the electrolyte.
AB - Due to its potential cost advantage, sodium ion batteries could become a commercial alternative to lithium ion batteries. One promising cathode material for this type of battery is layered sodium manganese oxide. In this investigation we report on the influence of morphology on cycle performance for the layered NaxMnO2+z. Hollow spheres of NaxMnO2+z with a diameter of similar to 5 mu m were compared to flake-like NaxMnO2+z. It was found that the electrochemical behavior of both materials as measured by cyclic voltammetry is comparable. However, the cycle stability of the spheres is significantly higher, with 94 mA h g(-1) discharge capacity after 100 cycles, as opposed to 73 mA h g(-1) for the flakes (50 mA g(-1)). The better stability can potentially be attributed to better accommodation of volume changes of the material due to its spherical morphology, better contact with the added conductive carbon, and higher electrode/electrolyte interface owing to better wetting of the active material with the electrolyte.
KW - sodium ion battery
KW - energy storage
KW - sodium manganese oxide
KW - spheres
KW - morphology
KW - RECHARGEABLE NA BATTERIES
KW - ELECTROCHEMICAL PROPERTIES
KW - CATHODE MATERIAL
KW - ENERGY-STORAGE
KW - HOLLOW STRUCTURES
KW - LITHIUM
KW - ELECTROLYTE
KW - INSERTION
KW - CHALLENGES
KW - NA0.74COO2
U2 - 10.1021/am406009t
DO - 10.1021/am406009t
M3 - Journal article
C2 - 24820186
VL - 6
SP - 8059
EP - 8065
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
SN - 1944-8244
IS - 11
ER -