Abstract
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.
Original language | English |
---|---|
Pages (from-to) | 611-617 |
Number of pages | 7 |
Journal | Current Applied Physics |
Volume | 16 |
Issue number | 6 |
DOIs | |
Publication status | Published - Jun 2016 |
Externally published | Yes |
Keywords
- Electrolyte additive
- Fumed silica
- Lithium-ion batteries
- Lithium-modified nanosalt