Lithium-jern-fosfat-akkumulator

Lithium-jern-fosfat-akkumulator
Energi/vægt	90-120 Wh/kg
Energi/størrelse	220 Wh/L
Pris/energi	0,04-0,12 Wh/kr
Selvafladningshastighed	4-5%/måned (temperaturafhængigt)
Holdbarhed over tid	3 år; 15+ år(A123Systems)
Cyklusholdbarhed	500...7.300+
Nominel cellespænding	3,2V
Opladningstemperaturinterval	0-45 °C
Særlige forhold	Forskellige fabrikanter cellers levetid kan være meget forskellig - ligesom prisen. Eksploderer ikke under ekstreme betingelser; f.eks. at skudt et søm igennem cellen, overopladning eller kortsluttet, på trods af at cellen indeholder lithium. Først over 800 °C bliver cellen ustabil.
	v; d; r;

Lithium-jern-fosfat-akkumulatoren (også set som LFP, LiFePO₄, LiFe-akkumulator) er en type af akkumulatorer, specifikt en lithium-ion-akkumulator, der benytter LiFePO₄ som katodemateriale.

LiFePO₄ celler kan have højere aflade strømme, meget hurtig ladetider, høj energitæthed og eksploderer ikke under ekstreme betingelser, men har lavere spænding og lavere start energitæthed end de normale Li-ion celler. Bemærk venligst følgende sammenligning med de normale Li-ion celler:

efter 1 års brug har LiFePO₄ typisk samme energitæthed
efter mere end 1 års brug har LiFePO₄ højere energitæthed

Grunden er at LiFePO₄ celler taber deres kapacitet langsommere end de normale Li-ion celler (kobolt eller mangan spinel baserede Lithium-ion-polymer-akkumulator eller Lithium-ion-akkumulator. ^[1] ^[6] ^[7]

^ ^a ^b ^c A123Systems Arkiveret 1. marts 2012 hos Wayback Machine Citat: "...Curent test projecting excellent calendar life: 17% impedance growth and 23% capacity loss in 15 [fifteen!] years at 100% SOC, 60 deg. C..."
^ "A123Systems: Technology; tryk på grøn "Thousands of Low Rate Cycles" under billede lidt til højre". Arkiveret fra originalen 21. juni 2009. Hentet 30. december 2008.
^ Fodnotefejl: Ugyldigt <ref>-tag; ingen tekst er angivet for referencer med navnet valencevideo
^ Sunhigh Battery Co.,Ltd: 3.2v LiFePO4 battery list Arkiveret 5. august 2008 hos Wayback Machine Citat: "...The chemical structure of LiFePO4 used in SUNHIGH battery is very stable. The cycle life is extraordinary. The performance of the SUNHIGH's Fe- Battery is excellent for cycling at high temperature as well as for overcharge and over discharge...Safety Performance...Overcharge (3C 10V)...Short Circuit (60℃)...Thermal Test (150℃, 10min)...Nail Penetration...Crush Test...Impact Test...No explosion, no fire, no smoke..."
^ AA Portable Power Corp: 3.2V 10Ah LiFePo4 poly
^ lifebatt.com: Sandia report Arkiveret 16. marts 2012 hos Wayback Machine, http://www.lifebatt.eu/
^ How to prolong lithium-based batteries Arkiveret 9. juni 2007 hos Wayback Machine Citat: "...The speed by which lithium-ion ages is governed by temperature and state-of-charge. Figure 1 illustrates the capacity loss as a function of these two parameters...
25 °C...[100% State of charge]...80% after 1 year
40 °C...[100% State of charge]...65% after 1 year ..."

[A123data-1] A123Systems Arkiveret 1. marts 2012 hos Wayback Machine Citat: "...Curent test projecting excellent calendar life: 17% impedance growth and 23% capacity loss in 15 [fifteen!] years at 100% SOC, 60 deg. C..."

[2] "A123Systems: Technology; tryk på grøn "Thousands of Low Rate Cycles" under billede lidt til højre". Arkiveret fra originalen 21. juni 2009. Hentet 30. december 2008.

[valencevideo-3] Fodnotefejl: Ugyldigt <ref>-tag; ingen tekst er angivet for referencer med navnet valencevideo

[4] Sunhigh Battery Co.,Ltd: 3.2v LiFePO4 battery list Arkiveret 5. august 2008 hos Wayback Machine Citat: "...The chemical structure of LiFePO4 used in SUNHIGH battery is very stable. The cycle life is extraordinary. The performance of the SUNHIGH's Fe- Battery is excellent for cycling at high temperature as well as for overcharge and over discharge...Safety Performance...Overcharge (3C 10V)...Short Circuit (60℃)...Thermal Test (150℃, 10min)...Nail Penetration...Crush Test...Impact Test...No explosion, no fire, no smoke..."

[5] AA Portable Power Corp: 3.2V 10Ah LiFePo4 poly

[6] tt.com: Sandia report Arkiveret 16. marts 2012 hos Wayback Machine, http://www.lifebatt.eu/

[7] How to prolong lithium-based batteries Arkiveret 9. juni 2007 hos Wayback Machine Citat: "...The speed by which lithium-ion ages is governed by temperature and state-of-charge. Figure 1 illustrates the capacity loss as a function of these two parameters...
25 °C...[100% State of charge]...80% after 1 year
40 °C...[100% State of charge]...65% after 1 year ..."

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Lithium-jern-fosfat-akkumulator

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