Carbon-nanofiber composite electrodes for thin and flexible lithium-ion batteries |
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Authors: | Mao-Sung Wu Jyh-Tsung Lee Pin-Chi Julia Chiang Jung-Cheng Lin |
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Affiliation: | (1) Department of Chemical and Material Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung, 807-78, Taiwan, ROC;(2) Materials Research Laboratories, Industrial Technology Research Institute, Hsinchu, 310, Taiwan, ROC |
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Abstract: | Addition of vapor-grown carbon nanofiber (VGCF) into a LiCoO2 composite electrode increases electrode’s conductivity and adhesion strength significantly. These increases are attributed
to the uniform distribution of network-like VGCF of high conductivity; VGCF not only connects the surface of the active materials,
its network penetrates into and connects each active material particle. VGCF composite electrode also improves the electrochemical
performance of thin and flexible lithium-ion batteries such as discharge capacity at high current densities, cycle-life stability,
and low-temperature (at −20 °C) discharge capacity. These improved electrochemical properties are attributed to the well-distributed
network-like carbon nanofibers, VGCF, within the cathode. The addition of VGCF reduces the electron conducting resistance
and decreases the diffusion path for lithium ions, hence increases the utilization of active materials during high-current
discharge and low-temperature discharge. In addition, network-like VGCF forms a more uniform cathode structure so as to have
a lower deterioration rate and correspondingly better life cycle stability. |
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