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Safety Characteristics

The lithium iron phosphate cell is free from the overcharge concerns. Therefore, the protection circuit design is simple and low cost.

Unique Characteristics of PHET's ENVIROFRIENDLY™ Cells
  
Non-toxic, non-contaminating; SGS / RoHS approved 
Extremely Safe; no explosion and will not catch fire under collision, over charged or short circuit 
Small in size and light in weight 
For all high power output applications 
Can be used under extreme temperature 
Extra long cycle life 
No memory effect 
Can be fully charged in a very short time 
COMPARISON DATA AMONG VARIOUS LITHIUM BASE BATTERIES:
C-LiFePO4 LiCoO2 LiMn2O4 Li(NiCo)O2
SAFETY AND ENVIRONMENTAL CONCERN Excellent
Safest and most envirofriendly among all the listed groups
Very unstable, must handle with extremely care, it might explode or catch fire under collision, over-charged, short circuit or when heat build-up. Have to handle with care, or it might explode or catch fire under collision or over-charged. Very unstable, must handle with extremely care, it might explode or catch fire under collision, over-charged, short circuit or when heat build-up.
CYCLE LIFE ExcellentCycle life can be as long as over 5,000 cycle, best among all the listed groups. AcceptableCycle life only up to 300~500 cycle. Not good for high C-rate discharge. UnacceptableCycle life only up to100~800 cycle, depending on the discharge C-rate. AcceptableCycle life can be 300~500 cycle. Not good for high C-rate discharge.
POWER WEIGHT DENSITY Acceptable Good Acceptable Good
LONG TERM COST Excellent
Most economic
High Acceptable High
ACCEPTABILITY Excellent (can be discharged at -45℃~ 70℃) Decayed beyond 55℃ ~ -20℃ Decayed extremely fast over 50℃ Decayed extremely fast over 55℃~ -20℃
REMARK
  1. Although, Lead Acid battery is lower in cost and safety acceptable; however, with extremely toxic, worse for the environmental concern, short cycle life, heavy in weight, therefore, we don't put it as a group for comparison.
  2. Nickel Hydride battery has a characteristic of low Power Weight Density, decayed faster under high temperature, worse in memory effect, not suitable for high output usage, neither for personal computer nor 3C products.
  3. The C-coated Lithium Iron Phosphate Battery has been proven as the most environmental friendly battery. It is the safest and most suitable for high output and long cycle life. Best for all areas where battery is needed.
  4. LiCoO2 has an unstable characteristic, it is not suitable for the personal hand-carried electronic devices.
Before employing the PHET's batteries in any applications, an approval must be issued by PHET.

Update In 2006-03-26

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