Organosilicon Electrolytes for L ithium lon Batteries

1. Silicon based electrolytes with polyethylene glycol oligomers improve thermal and electrochemical stability of lithium-ion batteries .

Increases battery long-term stability.

3.Are less flammable than conventional organic carbonate-based solvents and maintain the safe operation of batteries.

4. Improves conductivity and kinetics of the lithium salts;

Electrochemical and Physical Properties:

1. Viscosity 1.4 cP at 25'C, doped with 0.8M LiBOB electrolyte 1.9 cP at 25"C; Conductivity of 0.8M L iBOB doped electrolyte: 1.18 x 10-3 s cm1 at 25'C; Thermally stable up to 400'C. Boiling point 233-234C; Glass transition temperature -1 16'C 1, 2.

2. Soluble electrolytic lithium salts: L iBOB, L iPF6 (o3 -0325), L iBF4 (o3 -0325 Strem product - not battery grade) and L iTFSI

3. ANL -1 NM3 electrolytes show ex cellent charge/discharge cycling behavior in lithium-ion cells .

Silane-based electrolytes with certain lithium salts are stable to 4.4 V ^[1]

Compared to other trimethylsilylated polyethyleneoxide oligomers (see also ANL -

1NM2; product # 14-1925) with two and three ethylene oxide units, these electrolytic blends are adv antageous for the conductivity and kinetics of the lithium salts ^[2].

some cases, ANL-1NM3 is

more preferable because of the higher boiling point (233-234'C vS 190-191'C of ANL -1 NM2)and a lower viscosity.

ANL- 1NM3 doped with lithium salts exhibit high ionic conductivity (more than 10 3 s cm 1) at room temperature. L ithium bis(oxalate )borate (LiBOB) a salt blended silicon electrolyte shows the most stable and highest electrochemical performance 3-5. In addition, silylated electrolytes show much better electrochemical stability than carbon and germanium analogues ^[6].

6. Organosilicon electrolytes help to enhance the transport properties of other electrolytes ^[7], show excellent thermal and electrochemical stability ^[8] and are applicable for L i-air batteries ^[9]

References:

1. Electrochem. Commun., 2006, 8, 429.

2.Phys. Chem. c, 2008, 112, 2210.

3.J. Power Sources, 2011, 196, 2255.

4.J. Power Sources, 2011, 196, 8301 .