TY  - JOUR
T1  - Lithium-silica nanosalt as a low-temperature electrolyte additive for lithium-ion batteries
AU  - Hamenu, Louis
AU  - Lee, Hae Soo
AU  - Latifatu, Mohammed
AU  - Kim, Kwang Man
AU  - Park, Jongwook
AU  - Baek, Yong Gu
AU  - Ko, Jang Myoun
AU  - Kaner, Richard B.
JO  - Current Applied Physics
VL  - 16
IS  - 6
SP  - 611
EP  - 617
PY  - 2016
DA  - 2016/06/01/
SN  - 1567-1739
DO  - https://doi.org/10.1016/j.cap.2016.03.012
UR  - https://www.sciencedirect.com/science/article/pii/S1567173916300517
KW  - Lithium-modified nanosalt
KW  - Fumed silica
KW  - Electrolyte additive
KW  - Lithium-ion batteries
AB  - 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 °C of the LiCoO2/graphite cell is particularly enhanced by adding Li202 nanosalt. In addition, excellent cycle performance at −20 °C endorses the use of Li202 nanosalt as a low-temperature electrolyte additive for LIBs.
ER  -