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UHPC Studies of typical additives

Measuring the Impact of Additives using High Precision Coulometry

The b) panel of the Figure shows that electrolyte additives improve the cycle life of Li-ion cells.  Using the High Precision Charger (HPC) to accurately measure coulombic efficiency allows cell lifetimes to be projected after only a few weeks of cycling 1-4.  In the a) panel below, the coulombic efficiency increases from control, to FEC, to VC, to VC+FEC+VEC+PS, just as the cycle life does in the right panel.  The HPC measurements can be made in a few weeks while the cycling tests can take many months.

Figure 1 - Coulombic efficiency
VC = vinylene carbonate, FEC = fluoroethylene carbonate, VEC = vinyl ethylene carbonate, PS = 1,3 propane sultone

References

  1. J.C. Burns, G. Jain, A. Smith, K. Eberman, E. Scott, J. Gardner and J.R. Dahn, J. Electrochem. Soc., 158, A255-A261 (2011).
  2. J.C. Burns, N.N. Sinha, D.J. Coyle, G. Jain, C.M. VanElzen, W.M. Lamanna, A. Xiao, E. Scott, J.P. Gardner, and J.R. Dahn, J. Electrochem. Soc., 159, A85-A90 (2012).
  3. J.C. Burns, N.N. Sinha, Gaurav Jain, Hui Ye, Collette M. VanElzen, W.M. Lamanna, A. Xiao, Erik Scott, J. Choi, and J.R. Dahn, J. Electrochem. Soc., 159, A1095-A1104 (2012).
  4. J.C. Burns, N.N. Sinha, Gaurav Jain, Hui Ye, Collette M. VanElzen, W.M. Lamanna, A. Xiao, Erik Scott, J. Choi, and J.R. Dahn, J. Electrochem. Soc., 159, A1105-A1113 (2012).