ASNE Day 2016 - Technical Paper Session 1 : Wednesday, March 2, 2016 1400-1545
DEMATL & Energy Storage
Authors: Weibing Xing, Stephen Cordova and Steven C. Arzberger
Title: High Performance, High Voltage LNMO (LiNi0.5Mn1.5O4) Cathode Active Material for (Pulsed) Power Applications
Abstract:
Due to its high theoretical capacity (147 mAh/g), high operating voltage (~4.7V vs. Li/Li+ of Ni2+/Ni4+ couple), and inherent cycle stability (Mn4+ state, no Jahn-Teller distortion of Mn3+), LiNi0.5Mn1.5O4 (LNMO) spinel is a promising cathode active material for high energy density lithium ion batteries [1, 2, 3] that can potentially be used in a wide range of applications including consumer electronics, electric vehicles, military and space. ADA’s LNMO is particularly well suited to address the emerging needs of rail guns and directed energy weapons. However, some performance issues of LNMO need to be addressed before its practical commercialization. These include extended cycle life, high rate capability, and cycle stability at elevated temperatures (e.g., 55C). ADA will present and discuss our efforts to optimize LNMO spinel performance via material and operational approaches to realize a “best in-class” LNMO.
ADA LNMO materials were prepared with a wide range of synthesis parameters. Comprehensive physical and electrochemical characterizations were performed. ADA utilized a method of performance space mapping, which contributed to the iterative synthetic design to produce LNMO with optimal characteristics and performance for specific applications. ADA’s optimized LNMO material delivers high specific capacity ~ 140 mAh/g, high specific energy > 600 Wh/kg, excellent rate capability up to 100C rate, long cycle life, and stability under high temperature cycling. We have further demonstrated that proprietary post-processing and/or molecular scale coatings have resulted in further enhanced LNMO possessing high temperature cycle stability. ADA LNMO materials are pairable with graphite or other high capacity anode materials for high energy density full cells. ADA’s proprietary LNMO synthesis process is tunable so that material properties can be tailored to suit for specific applications. The process can be economically scaled to production quantities.
References
1. Qiming Zhong, Arman Bonakdarpour, Meijie Zhang, Yuan Gao and J. R. Dahn, J. Electrochem. Soc., 144, 205 (1997).
2. K. Amine H. Tukamoto, H. Yasuda, and Y. Fujita, J. Power Sources, 68, 604 (1997).
3. Jing Mao, Kehua Dai, and Yuchun Zhai, Electrochimica Acta, 63, 381 (2012).
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