Rechargeable: Difference between revisions
m
→Lithium Iron Phosphate (LiFePo4) - 3.3V/cell: Oxygen is an element so gets a capital letter, in a "molecule" you have one lithium atom, one iron atom and four oxygen atoms. So it is LiFePO4
m (→Lithium Iron Phosphate (LiFePo4) - 3.3V/cell: Oxygen is an element so gets a capital letter, in a "molecule" you have one lithium atom, one iron atom and four oxygen atoms. So it is LiFePO4) |
|||
| Line 71: | Line 71: | ||
Offers about a 20% increase in charge density over Li-ion, but again, offset by cost. These batteries are usually rectangular in shape and are used more often in MP3 players and cell phones than flashlights. | Offers about a 20% increase in charge density over Li-ion, but again, offset by cost. These batteries are usually rectangular in shape and are used more often in MP3 players and cell phones than flashlights. | ||
===Lithium Iron Phosphate ( | ===Lithium Iron Phosphate (LiFePO4) - 3.3V/cell=== | ||
New LiFePo4 batteries have about 20% lower energy density than Li-ion, but they become even after about a year of use. LiFePo4 also have much longer life (typically about 10 years, as opposed to 2-3 years for Li-ion) and can endure almost double charge/discharge cycles than Li-ion. They also have lower self-discharge rate, and are able to deliver higher current, and are more resistant to thermal runaway. However, as they are not as popular as Li-ion, they are still somewhat more expensive. Because they can not be charged to 4.2V, they require a special charger (or hobby charger that can be set to 3.6V max). Walmart sells 3.2V AA-sized LiFePo4 cells by Westinghouse for solar lighting (so no charger included). | New LiFePo4 batteries have about 20% lower energy density than Li-ion, but they become even after about a year of use. LiFePo4 also have much longer life (typically about 10 years, as opposed to 2-3 years for Li-ion) and can endure almost double charge/discharge cycles than Li-ion. They also have lower self-discharge rate, and are able to deliver higher current, and are more resistant to thermal runaway. However, as they are not as popular as Li-ion, they are still somewhat more expensive. Because they can not be charged to 4.2V, they require a special charger (or hobby charger that can be set to 3.6V max). Walmart sells 3.2V AA-sized LiFePo4 cells by Westinghouse for solar lighting (so no charger included). | ||