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III.A.3 EV Battery Technology Assessment (SK Innovation) Chulheung Bae, USABC Program Manager Subcontractor: SK Innovation Kyungjin Park, Program Manager 325 Expo Road, Wonchondong, Yuseongku, Daejeon, Korea Phone: (82) 42-609-8133; Fax: (82) 42-609-8740 E-mail: kj.park@sk.com Start Date: November 2012 Projected End Date: January 2014 Objectives Develop and validate a pure NCM battery system o High energy density o Longlifeperformance o Highabusetolerance Technical Barriers One of the concerns about pure NCM system is safety. Therefore, improved ceramic coated separator and a new electrolyte system are required. SK applied ceramic coated separator with superior strength and heat stability based on SK’s own technology and also adjusted the electrolyte system. Technical Targets The USABC minimum electric vehicle (EV) battery technical targets for the system are listed inTable III - 4. Accomplishments Validation of power density with over 600W/L and specific discharge and charge powers of over 460W/kg and 480W/kg Development of 40Ah cell with 230Wh/L and specific energy 150Wh/kg Successful life performance with over 2,000 cycles (expected) Table III - 4: Summary of USABC targets for the system being developed Power density (W/L) Specific power Dis. 80% DOD/30s (W/kg) Specific power Regen, 20% DOD/10s (W/kg) Energy density C/3 Discharge rate (Wh/L) Specific energy C/3 Discharge rate (Wh/kg) Specific power/Specific energy ratio Total pack size (kWh) Life (Years) Cycle life - 80% DOD (Cycles) Power & Capacity degradation (% of rated spec) Operating environment (°C) Normal recharge time Continuous discharge in 1hour – No failure (% of rated energy capacity) Introduction As the requirements for the EV market are getting more demanding in energy density and life including driving distance, SKI has developed and introduced high energy 40Ah (LMO-free) cells for this USABC EV technology assessment program. SKI set a goal of higher energy density and improved calendar life maintaining good cycle life and stability, and also developed 40Ah cell with Mn-spinel free and named it LMO-free E400. The LMO-free cell can avoid Mn- dissolution which brings crucial deterioration at high temperatures, so this program’s cell is expected to have an improved calendar life. SKI also applied a thermally superior ceramic coated separator and developed electrolyte formulation with adjusted electrolyte additives for LMO-free system. From performance validation tests, LMO-free High rate charge Parameter(Units) of fully burdened system USABC minimum goals 460 300 150 230 150 2:1 40 10 1,000 20 -40 to +50 20% performance loss (10% desired) 6 hours (4 hours desired) 20-70% SOC < 30minutes @150 W/kg (<20min @ 270W/kg Desired) 75 FY 2013 Annual Progress Report 35 Energy Storage R&DPDF Image | Advanced Battery Development
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