TY - JOUR
T1 - Application of Sn-Ni alloy as an anode for lithium-ion capacitors with improved volumetric energy and power density
AU - Ahn, Seongki
AU - Nakamura, Yusuke
AU - Nara, Hiroki
AU - Momma, Toshiyuki
AU - Sugimoto, Wataru
AU - Osaka, Tetsuya
N1 - Funding Information:
This work is partially supported by Advanced Low Carbon Technology Research and Development Program of the Japan Science and Technology Agency (JST-ALCA, JPMJAL1008). And the in-operando observation of electrodes was done with financial supported by Grand-in-Aid for Scientific Research (S) from the Japan Society for the Promotion of Science (grant number: JP16H06368).
Publisher Copyright:
© The Electrochemical Society.
PY - 2019
Y1 - 2019
N2 - Lithium-ion capacitors (LIC) constructed by combining a supercapacitor-like cathode and battery-like anode are expected to bridge a gap between low power density from lithium-ion batteries (LIB) and low energy density from the supercapacitors. In this study, we synthesize the Sn-Ni alloy by electrodeposition in the aqueous solution as an anode for LIC. The lower volume expansion rate of Sn-86 than pure Sn anode can be confirmed by in-operando investigation using an optically transparent cell during the 1st charging process. This is attribute to the co-deposited Ni can act as a buffer matrix to restrain volume expansion. For the full-cell test, the pre-lithiation condition of Sn-Ni was investigated with different depth of discharge levels. As a result, a LIC consisting of activated carbon (AC) cathode and Sn-86 exhibits a good cyclability for 3000 cycles with a capacity retention of 80% and coulombic efficiency of 98% at 3000th cycle. The Sn-Ni//AC LIC shows improved volumetric energy and power density than graphite//AC LIC. This study presents a new possibility of Sn-Ni alloy as an anode for the improved electrochemical performance of LIC.
AB - Lithium-ion capacitors (LIC) constructed by combining a supercapacitor-like cathode and battery-like anode are expected to bridge a gap between low power density from lithium-ion batteries (LIB) and low energy density from the supercapacitors. In this study, we synthesize the Sn-Ni alloy by electrodeposition in the aqueous solution as an anode for LIC. The lower volume expansion rate of Sn-86 than pure Sn anode can be confirmed by in-operando investigation using an optically transparent cell during the 1st charging process. This is attribute to the co-deposited Ni can act as a buffer matrix to restrain volume expansion. For the full-cell test, the pre-lithiation condition of Sn-Ni was investigated with different depth of discharge levels. As a result, a LIC consisting of activated carbon (AC) cathode and Sn-86 exhibits a good cyclability for 3000 cycles with a capacity retention of 80% and coulombic efficiency of 98% at 3000th cycle. The Sn-Ni//AC LIC shows improved volumetric energy and power density than graphite//AC LIC. This study presents a new possibility of Sn-Ni alloy as an anode for the improved electrochemical performance of LIC.
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U2 - 10.1149/2.0661915jes
DO - 10.1149/2.0661915jes
M3 - Article
AN - SCOPUS:85076113677
SN - 0013-4651
VL - 166
SP - A3615-A3619
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
IS - 15
ER -
