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Safety Comparison of different Lithium Ion Chemistries

There are several reports available on the Web describing the Safety of Lithium Ion batteries and battery Packs.

In particular a Sandia National Laboratory Safety Study Report published in 2008 (read on energy.gov (pdf)).

In Summary, Lithium Iron Phosphate (LFP) Cell Chemistry, is safer and more abuse tolerant

Lithium ion batteries are not all the same

There are a wide number of chemistries used in Li-Ion batteries.

  • Oxide Base Lithium ion: Conventional lithium ion battery cathodes have been transition metal oxides that use cobalt (Co), manganese (Mn), or nickel (Ni) based oxides
  • Lithium Iron Phosphate (LFP): Safest Chemistry uses chemically stable LFP which does not exhibit the energetic thermal runaway that metal oxide lithium ion cells experience.

There are a wide number of chemistries used in Li-Ion batteries. LFP batteries avoid the reactivity, safety, and abuse sensitivity issues involved with the use of lithium metal cathodes by using phosphate for its cathode; no metallic lithium is present in the cell. Li-Ion batteries with liquid electrolyte are rechargeable batteries and have a cathode of various classes of materials that include layered LiMO2 (M = Co, Ni, Mn or combinations of these or other metals, i.e. Al, Mg, etc.), olivines (LiFePO4), or spinels such as manganese oxides. The anode is usually a form of carbon, namely, coke, natural and synthetic graphites, mesophase carbon micro beads (MCMB) or carbon fibers. The electrolyte in these cells is made up of a combination of organic carbonates and a salt. The most commonly used salt is LiPF6 (lithium hexafluorophosphate). Other salts such as LiBOB (Lithium bisoxalatoborate) or LiBF4 (lithium tetrafluoroborate) have also been used.

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  • Cold temperature

    Acumentrics Total Power Solutions including the RUPS™ are tested to the most stringent cold temperatures down to -20°C with LFP batteries. For solutions requiring lower temperatures, contact Acumentrics.

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  • Hot temperature

    Acumentrics Total Power Solutions are field war zone proven and support very high temperatures with very long life and high reliability with LFP Chemistry up to 60°C. Storage at high temperatures is possible with a very limited effect on battery life.

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  • Blown Precipitation

    Our unique heat exchanger Flo-thru™ technology, tunnel design and sealed enclosure provide maximum protection for internal components from damaging effects of blown precipitation and any other contaminants like dust, sand, moisture and others, delivering an unmatched reliability for our RUPS™ in combat zones harsh environment.

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  • Shock and vibration

    All our RUPS™ used in communications and electronic power devices are tested and proven with extremely high reliability in combat zone extremely harsh environment for mobile applications with stringent shock and vibration abuse. They have been tested and passed MIL-STD-810G and MIL-S-901-D.

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  • Fault tolerant

    Our Rugged Blade UPS™ is designed to support, resilient, fault tolerant, power systems, using an N+1 configuration, when clean power is mission critical. Acumentrics peer to peer relationship between the units with a "moving master, sliding slave" scheme delivers the highest possible reliability with up to 8 units in parallel using a very resilient N+1 Rugged Sync Bus™

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  • RUPS™
    Acumentrics RUPS 1,000W to 2,400W series RUPS have achieved MIL-STD-810-G (environmental), MIL-STD-461-F (electro-magnetic interference), and MIL-STD-1275-D (steady state and transient voltages) certifications.

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  • PDB and PDU
    The Rugged PDU and Rugged Backplane from Acumentrics eases power distribution, simplifies cabling and offers circular mil-spec connectors sealed with positive latching to protect against rain, wind, dust, blowing sand, humidity, vibration and shock.

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  • Battery Packs, Internal and External modules
    LFP and Lead Acid battery packs provide low maintenance, high run time and enhanced cycle life. Acumentrics External Battery Modules (EBM) increase battery runtime.

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    Sampling of Acumentrics Rugged UPS accessories. Contact customer services at cs@acumentrics.com or at 844-787-7872 (844-RUPS-USA) to discuss your configuration needs.

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Acumentrics' Products


Why Acumentrics

Since 1994, Acumentrics engineering and manufacturing teams continue to deliver total power solutions that provide data center quality power to mission critical applications. Made in Walpole, MA (USA) Acumentrics total power solutions includes Rugged-UPS™ (Uninterruptible Power Supply), power conditioners, inverters, portable power and power distribution units that can be mounted in 19" racks, transit cases, roller cases, back packs and hand carried.


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