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NOMO All in one solar street lights with safer and rechargeable Li Fe PO4 battery
- Oct 18, 2017 -

NOMO ALL IN ONE SOLAR STREET LIGHTS is the one of the most important application of Li FE PO4 BATTERY, The lithium iron phosphate (LiFePO4) battery, also called LFP battery (with "LFP" standing for "lithium ferrophosphate"), is a type of rechargeable battery, specifically a lithium-ion battery, which uses LiFePO4 as a cathode material, and a graphitic carbon electrode with a metallic current collector grid as the anode. LiFePO4 batteries have somewhat lower energy density than the more common lithium cobalt oxide (LiCoO2) design found in consumer electronics, but offer longer lifetimes, better power density (the rate that energy can be drawn from them) and are inherently safer. LiFePO4 is finding a number of roles in vehicle use and backup power.


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NOMO ALL IN ONE SOLAR STREET LIGHTS ARE EQUIPED WITH REPLACEABLE POWER PACK, AND THE MOST STAINLESS CASE WITH LIFE PO4 BATTERY, MEANWHILE, IP66 WATERPROOF,IT HELP the extend the lifetime of battery. 


Safety

One important advantage over other lithium-ion chemistries is thermal and chemical stability, which improves battery safety.[10] LiFePO
4
 is an intrinsically safer cathode material than LiCoO
2
and manganese spinel. The 
FePO bond is stronger than the CoO bond, so that when abused, (short-circuited, overheated, etc.) the oxygen atoms are much harder to remove. This stabilization of the redox energies also helps fast ion migration.


As lithium migrates out of the cathode in a LiCoO
2
 cell, the CoO
2
 undergoes non-linear expansion that affects the structural integrity of the cell. The fully lithiated and unlithiated states ofLiFePO
4
 are structurally similar which means that LiFePO
4
 cells are more structurally stable than LiCoO
2
 cells.

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No lithium remains in the cathode of a fully charged LiFePO
4
 cell—in a LiCoO
2
 cell, approximately 50% remains in the cathode. LiFePO
4
 is highly resilient during oxygen loss, which typically results in an exothermic reaction in other lithium cells.

As a result, lithium iron phosphate cells are much harder to ignite in the event of mishandling (especially during charge) although any fully charged battery can only dissipate overcharge energy as heat. Therefore, failure of the battery through misuse is still possible. It is commonly accepted that LiFePO
4
 battery does not decompose at high temperatures. The difference between LFP and the LiPo battery cells commonly used in the aeromodelling hobby is particularly notable.

Specifications

  • Cell voltage

    • Minimum discharge voltage = 2.5 V

    • Working voltage = 3.0 ~ 3.3 V

    • Maximum charge voltage = 3.65 V

  • Volumetric energy density = 220 Wh/dm3 (790 kJ/dm3)

  • Gravimetric energy density > 90 Wh/kg (> 320 J/g)

  • 100% DOD cycle life (number of cycles to 80% of original capacity) = 2,000–7,000

  • 10% DOD cycle life (number of cycles to 80% of original capacity) > 10,000

  • Sony Fortelion: 74% capacity after 8,000 cycles with 100% DOD

  • Cathode composition (weight)

  • Cell configuration

  • Experimental conditions:

    • Room temperature

    • Voltage limits: 2.0–3.65 V

    • Charge: Up to C/1 rate up to 3.6 V, then constant voltage at 3.6 V until I < C/24