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Non-TCO Overcharge Solution ------ Polymer NB Cell Safety Improvement

Non-TCO Overcharge Solution ------ Polymer NB Cell Safety Improvement. YaBo Power Technology Co.,Ltd www.brandbattery.com 2009-2-21. Background. Purpose: Non-TCO design for PAP NB project TCO price: ~0.15 $ /pcs (3rd in current M6S BOM) TCO -outsourcing

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Non-TCO Overcharge Solution ------ Polymer NB Cell Safety Improvement

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  1. Non-TCO Overcharge Solution ------Polymer NB Cell Safety Improvement YaBo Power Technology Co.,Ltd www.brandbattery.com 2009-2-21

  2. Background • Purpose: Non-TCO design for PAP NB project • TCO price: ~0.15 $/pcs (3rd in current M6S BOM) • TCO -outsourcing • Complicated TCO welding process • Challenge • High energy density --- 410Wh/L~420Wh/L • Larger single cell capacity --- 2.8~3.4Ah • High cycle life requirement --- >800 at 25℃ and 45℃ • UL1642 safety test --- MUST pass • HT storage performance --- keep the current level • BOM cost --- can not higher than current level

  3. Ideas and Brief Summary • By now the solution --- “LCO/LMO” --- Works!

  4. Solution 1--- Surface coated cathode / LPD cathode • Analysis • Al2O3 coated layer can decrease the react area of cathode/electrolyte interface • In overcharge state, Al can compensate the defect of crystal lattice, decrease degradation rate • DSC test indicates Al2O3 coated material has more thermal stability

  5. BD981/NCM=4:1 0.5C/6V/8H Fail! Al2O3 Coated LCO/NCM=4:1 0.5C/6V/8H Pass! Solution 1 --- Surface coated cathode / LPD cathode • Overcharge Performance

  6. Solution 1 --- Surface coated cathode / LPD cathode • Result by now • Surface coated cathode can improve overcharge and internal short to some extent • The improvement related with different coating content/coating material/coating process (different vendor) • Side effects is larger K-value than non-coated cathode • Next step action • Focused on LPD which NPD developed • Design in new generation products • Study the larger K-value mechanism

  7. Solution 2 --- LCO/LMO Hybrid • Analysis • Fully charge LMO is more thermal stable than LCO • Lithium total extraction from LiMn2O4 will not result in the loss of oxygen from the lattice

  8. Solution 2 --- LCO/LMO Hybrid • Design • LCO/LMO hybrid cathode • PAP new model: 506971

  9. Solution 2 --- LCO/LMO Hybrid • Overcharge Performance --- OK • Pass 0.5C/12V w/o breaker (20/20) • Cell surface temperature less than 100℃ • LCO/LMO cathode shows earlier shut down character before thermal run away

  10. Solution 2 --- LCO/LMO Hybrid • Cycle life data • RT & 45degC cycle can match 500cls requirement by prediction • 60degC cycle life decay rapidly

  11. Solution 2 --- LCO/LMO Hybrid • Result by now for the new design • Can pass 0.5C/12V overcharge w/o breaker • Energy density increase ~3.5% than Gen2 • BOM cost ~7% increase compare Gen2 + breaker • Cycle life especially HT cycle life need improved • UL1642 test OK • HT storage OK • Further actions • Design optimization for BOM cost down A2 graphite application (1) BOM cost: LCO/LMO+A2 ~ Gen2+breaker(save 7%) (2) Energy density increase ~3% than Gen2 • Cycle life improvement (especially HT cycle) • A2 improve cycle life • Electrolyte optimization (1) RT&45degC cycle life reach 800~1000cls

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