THT is the Original Company for ARC & Battery pioneered ARC for over 20 years Pioneered Li Battery for over 10 years Sales, service, support worldwide THT is the Original Company for ARC & Battery pioneered ARC for over 20 years Pioneered Li Battery for over 10 years Sales, service, support worldwide Thermal Hazard Technology

Worldwide – Major Users Sony, Sanyo, Toshiba, Mitsubishi, Panasonic, GS Battery, BAK, Lishen, ATL Samsung, LG NASA, Penn State Univ, GM-Delphi, Motorola, Sandia National Labs, Duracell Nokia, SAFT, Ultralife, Varta, Valence Worldwide – Major Users Sony, Sanyo, Toshiba, Mitsubishi, Panasonic, GS Battery, BAK, Lishen, ATL Samsung, LG NASA, Penn State Univ, GM-Delphi, Motorola, Sandia National Labs, Duracell Nokia, SAFT, Ultralife, Varta, Valence Li Battery Companies with THT ARC

Thermal properties; effect of heat on batteries effect of heat produced by batteries Well known – temperature exposure, overcharge / discharge, shorting Heard details of such safety details, reference to in-house empirical tests, DSC, UL 150C Hot box, and some ARC data Thermal properties; effect of heat on batteries effect of heat produced by batteries Well known – temperature exposure, overcharge / discharge, shorting Heard details of such safety details, reference to in-house empirical tests, DSC, UL 150C Hot box, and some ARC data Safety Issues with Li Batteries

The Accelerating Rate Calorimeter has become accepted as a key instrument for assessing the thermal hazard potential of Li Batteries Unlike other tests … it is not empirical Quantifies the thermal effect Gives a ‘ worst case ’ assessment Can test batteries of ‘ any size ’ Different labs anywhere can compare data The Accelerating Rate Calorimeter has become accepted as a key instrument for assessing the thermal hazard potential of Li Batteries Unlike other tests … it is not empirical Quantifies the thermal effect Gives a ‘ worst case ’ assessment Can test batteries of ‘ any size ’ Different labs anywhere can compare data Safety Issues with Li Batteries

Evaluate the reactions in any type of battery component, for their stability and safety Evaluate made batteries under any state of charge, for their stability and safety Evaluate effect of abuse testing on battery safety, shorting over-voltage testing Evaluate batteries when charged, discharged, cycled for their thermal properties, to get life cycle and electrothermal efficiency information Evaluate the reactions in any type of battery component, for their stability and safety Evaluate made batteries under any state of charge, for their stability and safety Evaluate effect of abuse testing on battery safety, shorting over-voltage testing Evaluate batteries when charged, discharged, cycled for their thermal properties, to get life cycle and electrothermal efficiency information Safety Issues with Li Batteries

Principle of ARC

Using the ARC with Battery Materials anode cathode electrolyte SEI…… fresh or after making / charging / cycling…. as per the work of Jeff Dahn Using the ARC with Battery Materials anode cathode electrolyte SEI…… fresh or after making / charging / cycling…. as per the work of Jeff Dahn

Data shows onset and temperature and pressure increase under worst case conditions

Data shows onset, heat generation at every temperature, temp rise is proportional to heat of reaction, slope is proportional to activation energy, shows complexity of decomposition, all under worst case conditions Data shows onset, heat generation at every temperature, temp rise is proportional to heat of reaction, slope is proportional to activation energy, shows complexity of decomposition, all under worst case conditions

Data varies with charge / age. Three regions of exothermicity, interface, anode and cathode reactions – but an will progress to explosion

Reaction Sequence in Li-Ion Battery exothermicity 1 st reaction – SEI 2 nd reaction – Anode (MCMB) 3 rd reaction – cathode (Li Spinel) Electrolyte – decomposition from 80 o C Electrolyte – very flammable Lithiated MCMB –air flammable hazard Delithiated spinel – shock sensitive explosive hazard

Li-Ion – Battery Safety Onset of Exothermic Reaction Overdischarged (2.0V) Onset = o C Fully Discharged (2.6V) Onset = o C Partially Charged (3.6) Onset = o C Fully Charged (4.2V) Onset = o C Overcharged (4.8V) Onset = o C Overcharged (>5V) Onset = ambient

Mobile phone Li-ion prismatic Shorting leads runaway Mobile phone Li-ion prismatic Shorting leads runaway

Lithium Iron Disulphide AA size Shorting does not lead to runaway – note gap in data Lithium Iron Disulphide AA size Shorting does not lead to runaway – note gap in data

Temperature test 3.7V

Overcharging of Li-Polymer Battery

4/5A Li-ion battery

Gibbs free energy efficiency Battery performance factor Q – charge capacity A – surface area m - mass

CycleProcess  ET  ET (%) 2Discharge Charge Discharge Charge Discharge Charge Battery performance and Gibbs free energy efficiency results

Gateway Notebook Battery Pack