xLi2MnO3·(1 − x)LiMO2 blended with LiFePO4 to achieve high energy density and pulse power capability |
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Authors: | Kevin G. Gallagher Sun-Ho KangSei Ung Park Soo Young Han |
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Affiliation: | a Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Ave, Argonne, IL 60439, United States b Hanwha Chemical Research & Development Center, 6 Shinsung Dong, Yuseong Gu, Daejon 305-804, Republic of Korea |
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Abstract: | A lithium-ion positive electrode is proposed that contains both high energy density and efficient pulse power capability, even at low state-of-charge (SOC). The pulse power capability at low SOC is attractive for applications, such as plug-in hybrid electric vehicles (PHEVs), which require pulse power operation over the entire useable SOC window. A lithium- and manganese-rich transition-metal layered-oxide (LMR-NMC), also classified as a layered-layered oxide material, is blended with a lithium iron phosphate (LFP) to achieve a potentially low-cost, high-performance electrode. The LMR-NMC material provides high energy by delivering cathode material gravimetric energy densities greater than 890 Wh kg−1. The pulse power capability of this material at low SOC is greatly improved by incorporating a modest quantity of LFP. The LFP serves as an internal redox couple to charge and discharge the more rate-limited LMR-NMC material at moderate to low SOCs. |
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Keywords: | Lithium rich Iron phosphate Blended electrode Lithium-ion battery |
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