Bibliography - Craig Arnold

1. Peabody, Christina, and Craig Arnold, 2011: The role of mechanically induced separator creep in lithium-ion battery capacity fade. Journal of Power Sources, Elsevier, 196, doi:10.1016/j.jpowsour.2011.05.023 8147-8153
   [ Abstract ]

   Lithium-ion batteries are well-known to be plagued by a gradual loss of capacity and power which occur regardless of use and can be limiting factors in the development of emerging energy technologies. Here we show that separator deformation in response to mechanical stimuli that arise under normal operation and storage conditions, such as external stresses on the battery stack or electrode expansion associated with lithium insertion/deinsertion, leads to increased internal resistance and significant capacity fade. We find this mechanically induced capacity fade to be a result of viscoelastic creep in the electrochemically inactive separator which reduces ion transport via a pore closure mechanism. By applying compressive stress on the battery structure we are able to accelerate aging studies and identify this unexpected, but important and fundamental link between mechanical properties and electrochemical performance. Furthermore, by making simple modifications to the electrode structure or separator properties, these effects can be mitigated, providing a pathway for improved battery performance.

2. Sutto, T. E., H. Ollinger, H. Kim, Craig Arnold, and A. Pique, 2006: Laser transferable polymer-ionic liquid separator/ electrolytes for solid-state rechargeable lithium-ion microbatteries. Electrochemical Solid State Letters, 9(2), doi:10.1149/1.2142158 A69-A71
   [ Abstract ]

   A laser-transferable polymer gel separator formulated from an imidazolium-based ionic liquid, poly(vinylidene fluoride) (PVDF) - HFP, and ceramic nanoparticles was prepared and electrochemically characterized by ac-impedance spectroscopy and in lithiumion microbatteries. Size and weight percent effects of the nanoparticulates added to the laser-transferred separator indicate that nanoparticulates under 100 nm in size and in the 10 wt % range exhibited the highest ionic conductivity (1–3 mS/cm). Li-ion microbatteries prepared using this separator, a LiCoO₂ cathode, and a carbon anode maintained an average discharge voltage of up to 4.2 V with a reversible specific energy of 330 mWh/g.

Direct link to page: http://cmi.princeton.edu/bibliography/results.php?author=3628