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Lithium-silica nanosalt as a low-temperature electrolyte additive for lithium-ion batteries
Hamenu, L.,Lee, H.S.,Latifatu, M.,Kim, K.M.,Park, J.,Baek, Y.G.,Ko, J.M.,Kaner, R.B. Elsevier 2016 Current Applied Physics Vol.16 No.6
<P>A lithium-modified silica nanosalt (Li-SiO2, coded Li202) of hydrophobic fumed silica (R202) is synthesized to use as an electrolyte additive for lithium-ion batteries (LIBs) under low temperature conditions. The synthesis method consists of reacting the silica nanoparticles with LiH and consequently quickly reacting the conjugate silicate ions with 1,3-propanesultone as a surface stabilizer. The obtained Li202 nanosalt (2.5 wt%) is added into an electrolyte solution of 1.0 M LiPF6 dissolved in ethylene carbonate/propylene carbonate/ethylmethyl carbonate/diethyl carbonate (20:5:55:20 vol%) + 2 wt% vinylene carbonate. The electrolyte solution including the Li202 nanosalt shows higher ionic conductivity and superior electrochemical stability over 5 V, which is due to the stabilized surface group. The high-rate capability at -20 degrees C of the LiCoO2/graphite cell is particularly enhanced by adding Li202 nanosalt. In addition, excellent cycle performance at -20 degrees C endorses the use of Li202 nanosalt as a low-temperature electrolyte additive for LIBs. (C) 2016 Elsevier B.V. All rights reserved.</P>
Probing spin-charge relation by magnetoconductance in one-dimensional polymer nanofibers
Choi, A.,Kim, K. H.,Hong, S. J.,Goh, M.,Akagi, K.,Kaner, R. B.,Kirova, N. N.,Brazovskii, S. A.,Johnson, A. T.,Bonnell, D. A.,Mele, E. J.,Park, Y. W. American Physical Society 2012 Physical review. B, Condensed matter and materials Vol.86 No.15