A lithium battery using an iron-based material is inferior in energy density to a lithium battery using a cobalt-based material, so the voltage of the lithium-based lithium battery is only 2.8 to 3.5 V, which is less than 3.75 to 4.1 V of the cobalt-based material. Need to develop new iron-based materials.
Fujitsu discovered that the deformation of the oxygen atoms around the iron atoms is an important factor in increasing the voltage, and developed a new material, Li5.33Fe5.33 (P2O7)4, which also produced a button battery of 3.8V. Voltage. This is higher than the iron phosphate battery represented by LiFePO4 in the past. However, the discharge capacity of the experimental coin cell test was 105 mAh/g, which is about 25% lower than the theoretical value of 139 mAh/g and 137 mAh/g of LiCoO2, and further development and improvement are needed in the future.
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