Electrovaya launches next generation of MN series of Li-ion SuperPolymer cells; claims energy densities exceeding 200 Wh/g
Electrovaya Inc. launched the next generation of its SuperPolymer lithiated manganese oxide-based MN series of cells, first introduced in 2007 (earlier post), the “MN-HP Series”. The company says that the energy version of technology (MN-eHP) exceeds 200 Wh/kg—one of the highest energy densities for a commercial Li-ion cell in a large prismatic design, according to the company.
Electrovaya’s MN-HP series cells use commercially proven electrode materials such as graphite anodes and lithium metal mixed oxide cathodes. The company says that the MN-HP cells typically have 50-70% higher energy density than typical phosphate cells, and more than 120% higher energy density than lithium titanate cells.
Higher energy density cells require fewer materials for a given energy capacity and therefore can be produced at lower costs. Higher energy density cells also contain proportionately lower amounts of flammable electrolytes, which substantially improve safety considerations, the company says.
Typical MN-HP cells are available in 30Ah to 40Ah format (110 - 150Wh) and housed in a flat polymer pouch.
The cells are produced by Electrovaya’s proprietary non-toxic production process which does not use massive quantities of toxic n-methyl pyrrolidone (NMP), unlike most other commercial lithium-ion battery manufacturers.
Electrovaya’s proprietary SuperPolymer technology is independent of the composition of the positive electrode active material. As such, ongoing advances in positive electrode chemistry, such as the MN-Series, are expected to enable better technical performance and safety characteristics at more economical price-points, according to the company.
Electrovaya currently offers cells based on three chemistries:
The MN series (lithiated manganese material), which is the company’s recommended chemistry for transportation. Energy densities range from 170 to 210 Wh/kg with peak power up to 2000 W/kg.
Phosphate-Series, with energy densities from 110 to 140 Wh/kg.
Cobaltate-Series, for small cells only.
Cell capacities range from 2 Ah to 200 Ah.
Electrovaya provided the Li-ion battery packs for Chrysler’s test fleet of plug-in hybrid electric pickups and minivans. Last Friday, Chrysler announced it was withdrawing from service the test fleet of PHEVs for a battery-pack upgrade. Three of the fleet’s 109 pickups equipped with plug-in hybrid powertrains sustained damage when their prototype 12.9-kWh lithium-ion propulsion battery packs overheated. (Earlier post.) No announcements as to new chemistry or supplier have been made yet.