Clean Technology 2010

New Class of Electrode Material Offers Potential to Fast Track Commercial Production of Advanced Lithium-Ion Batteries

B. Jang
Nanotech Instruments, US

Keywords: nano graphene platelet, battery, nanotechnology


Nanotek has developed a cost-effective, high performance nanomaterial called nano graphene platelets (NGPs). In addition to other performance advantages, NGPs demonstrate the highest intrinsic strength (130 GPa) and highest thermal conductivity (5,300 W/mK) when compared with other existing materials. Commercialization of Lithium-ion (Li-ion) battery technology is crucial to advancing the transition from gasoline-powered to electric vehicles. The technical challenge has been the inability to maintain electron path continuity in the electrode during repeated charge-discharge cycles. To solve the problem, researchers worldwide have worked to mix Silicon (Si) nano particles with carbon, but with limited success. Nanotek has solved this problem with its development of NGP-SI, a new class of electrode material that dramatically improves charge/discharge rates by retaining structural integrity throughout multiple charge-discharge cycles. In addition to capturing and maintaining the highest charge capacity allowed with silicon over an extended cycle life, the NGP-Si material has demonstrated an anode specific capacity of typically 2,000 - 3,000 mAh/g over 300 cycles, a rate six to eight times higher than the theoretical limit (372 mAh/g) of the current graphite-based anode material which has an actual capacity of typically 250-350 mAh/g. Twelve US patents on the NGP composite-based electrode technologies are pending.
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