Chevrolet Spark EV with Envia battery pack... maybe some day?

Chevrolet Spark EV with Envia battery pack... maybe some day?

Six new applied battery research projects with objective to develop lithium-ion cells, which exceed energy density of 200 Wh/kg, were recently launched with support of $17.4 million from the US Department of Energy (DOE). Timeframe for the projects end in 2015.

Interesting is that we found Envia on the list, a company which had some adventures with General Motors. Moreover Envia got the most - $3.8 million for its project, in which besides Lawrence Berkeley and Oak Ridge National Laboratories, General Motors participates too. General Motors?  Really?

"Envia is leading a $3.8-million project that includes Lawrence Berkeley and Oak Ridge National Laboratories and General Motors. Envia has licensed Lithium-rich Layered-Layered Li2MnO3·LiMO2 composite patents from Argonne National Laboratory, and has developed HCMR (High Capacity Manganese Rich) cathodes based on these layered-layered composite structures."

"Envia tailors HCMR based on the application (e.g., hybrid, pug-in hybrid or EV) using particle morphology, composition and nanocoatings. With one HCMR type in production (XP), Envia has two others in R&D (XE and XLE). In the ABR program, Envia is currently using an HCMR XLE cathode (240~280 mAh/g). While HCMR offers high capacity and safety and low cost, it can be challenged by high DC-Resistance, voltage fade upon cycling and poor durability."

"The team plans to integrate the HCMR cathode material with a Si-C anode. Envia’s anode material will be paired with LBNL’s conductive binder to enable the long cycle and calendar life meeting ABR PHEV goals."

Five other projects also using promising, but problematic in the implementation, silicon anodes:

  • Argonne National Laboratory. A team led by Argonne National Laboratory and including Brookhaven and Lawrence Berkeley National Laboratories and the University of Utah, is developing a new high energy redox couple (250 Wh/kg) based on a high-capacity full gradient concentration cathode (FCG) (230 mAh/g) and a Si-Sn composite anode (900 mAh/g). Project funding is $2.5 million.
  • TIAX. TIAX is the sole organization in a $2.2-million project to combine TIAX’s proprietary CAM-7 cathode material with a blended Si/carbon anode to achieve >200 Wh/kg and >400 Wh/L energy and >800 W/kg and >1600 W/L 10s pulse power targets under USABC PHEV battery testing procedures.
  • 3M. The 3M-led project, which includes Umicore, Army Research Laboratory, Berkeley Lab, Leyden Energy and GM Research and Development, is receiving $3 million in DOE funding. The basic approach is to combined a high-capacity Silicon alloy anode with a high energy NMC cathode and advanced electrolyte.
  • Penn State/University of Texas at Austin. The Penn State/U Texas project is a $2.4-million effort that includes EC Power, and Argonne and Lawrence Berkeley National Laboratories and that targets a high-energy, high-power cell for EV applications.
  • Farasis Energy. Farasis is leading a $3.5-million project that includes Argonne and Lawrence Berkeley National Laboratories, Dupont and Nanosys/OneD Material to demonstrate a PHEV40 cell with an energy density of 250 Wh/kg and an EV light duty cell with an energy density 350 Wh/kg that can meet the cycle life goals for those applications.

Source: Green Car Congress

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