PEO-LiN

Figure 2. Phase diagram for PEO-LiN(CF,S03)2 showing the eutectic equilibrum between PEO (Mw =4xI06) ant the 6 1 (salt wt. Fraction 0.52) intermediate compound. Compiled from C. I. abreche, I. Levesque, J. Prud homme, Macromolecule 1996, 29, 7795 and S. Lascaud, M. Perrier, A. Vallee, S. Besner, J. Prud homme, M. Armand, Macromolecules 1994, 27, 7469.

LiN(S02CF3)2. Not only was the electrolyte film of 55 wt % MEEP 45 wt % PEO-[LiN(S02CF3)2]o.i3 dimensionally stable, but it also exhibited a conductivity of 6.7 x 10 Scm" at 25°C, among the highest reported to date for a dimensionally stable conventional polymer electrolyte. The log conductivity versus 1/T plot for this electrolyte given in Figure 3.4 has a profile expected for an amorphous material showing the VTF behaviour. 

Figure 18.2 Phase diagram for PEO-LiN(CF3S03)2 showing the eutectic equilibrium between PEO (MW = 4x10 ) and the 6 1 (salt weight fraction 0.52) intermediate compound. Compiled from...

Shin J H, Passerini S, Shin J H and Passerini S (2004) PEO-LiN.S02CF2(Cp3)2 Polymer Electrolytes V. Effect of Fillers on Ionic Transport Properties, J. Electrochem. Soc., 151, pp. A238-A245. 

IREQ-3M-ANL, Canada-USA USABC M-PEO-LICLO4 LiN(CF3S02)2 v6o13 10 Wh prototype Scaling-up... 

Fig. 13. Cyclic charge/discharge for the first 83 cycles of an Li/PEO -I- LiN(S03CF3)2/poly-(2,5-...

Micellar solutions may also be used to increase the chemical stability of a drug. Hence, since the micellar core is generally essentially free of water, there is typically a reduction of the hydrolysis rate on solubilization. As an example of this, Lin et al. found that the hydrolysis of indomethacin was lowered when it was solubilized into PEO-PPO-PEO block copolymer micelles (148). In particular, the hydrolysis rate was reduced at higher copolymer concentrations and molecular weights (constant EO/PO ratio), which follows the solubilization capacity of these block copolymers (Figure 1.10). 

It is perhaps not coincidental that the conventional polymer electrolyte which reportedly exhibits a conductivity of about 10 Scm at room temperature is a LiN(S02CF3)2 complex. Le Nest et al. [19] prepared this electrolyte from a new polymer network composed of PEO-polyurethane... 

We have prepared [17] electrolytes from LiN(S02Cp3)2 and both MEEP and MEEP/PEO mixtures vide infra). These electrolytes exhibited a room temperature conductivity of about 6x 10" Scm" one of the highest for conventional polymer electrolytes. 

Subramanian A, Vu D, Larsen GF, Lin H-Y (2005) Preparation and evaluation of the electrospun chitosan/PEO fibers for potential applications in cartilage tissue engineering. J Biomat Sci Polym Ed 16 861-873... 

LiTFSI is the abbreviation for LiN(S02CF3)2 (hthium bis(trifluoromethanesulfonyl)imide). It corrodes the aluminum of the current collectors with a voltage higher than 4.2 V. However, as PEO requires the voltage to be limited to 4 V, we can use LiTFSI with no danger of degradation of the element. 

Figure 34 Simulation snapshots of the phase transfer process of the PNIPAM-PEO micellar shuttle in a water-ionicliquid system. Figure taken from Lin et al (2012).

---