Effect of solution additives on the performance of PMAN carbon anodes in 1M LiPF{sub 6}/EC-DMC solutions [report]

R.A. Guidotti, B.J. Johnson
1996 unpublished
A study was undertaken to examine the use of a number of solution additives in 1M LiPFdethylene carbonate (EC)-dimethyl carbonate (DMC) solutions to improve the performance of carbon anodes derived from polymethylacrylonitde (PMAN)-divinylbenzene (DVB) copolymers. The study goals were to improve the cycle life and reduce the formation of the passivation layer during the first reduction, thereby minimizing the irreversible-capacity losses. Additives studied were 12-crown-4 (12-Cr-4) ether,
more » ... -Cr-4) ether, decalin, and dilithium phthalocyanine (LizPc). The carbon performance was characterized by galvanostatic cycling, cyclic voltammetry, and complex-impedance spectroscopy. Limited success was obtained with 12-Cr-4 ether at 0.25M and decalin at 1 v/o. Poor results were noted with LiZPc at 0.025M and 0.5M. ether reduced the reactivity of lithiated graphite towards PC and EC [S-91. Similar performance enhancements were also noted for coke anode materials [7]. Some work has been done using transition-metal phthalocyanines as cathodes in Li cells with PC-based electrolytes [lo]. Geneation of propylene gas was observed during the discharge of such cells, with only a small amount of gas generation in the case of LiZPc [I 11. More recently, Machill and Rahner reported the use of LizPc as an additive to 1M LiC104 in PC improved the cycleability of metallic Li and Li-Al anodes MSTRlSUTiON OF THIS DOCUMENT I S UNEIMI P 0 DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any o€ their employees, make any warranty, express or implied, or assumes any legal liability or responsibility for the aamacy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.
doi:10.2172/486068 fatcat:a5ebkg6wmbagbcll6dwbs522ze