Fujitsu successfully developed a high-pressure iron phosphate battery cathode material

Fujitsu Ltd. May 29, 2017 Announced the successful development of cathode materials for high-voltage iron phosphate batteries that can rival cobalt-based materials. Now lithium-ion battery cathode material using lithium cobalt oxide (LiCoO2), due to the depletion of cobalt materials may lead to substantial increase in battery costs.

Compared with lithium batteries using cobalt-based materials, the lithium batteries using iron-based materials are not as energy-dense as the latter. Therefore, the voltage of iron-based lithium batteries is only 2.8 to 3.5V, which is less than that of cobalt-based materials, 3.75 to 4.1V Need to develop new iron-based materials.

The Fujitsu found that the position of the oxygen atoms around the iron atoms are deformed is an important factor to increase the voltage and the development of a new material Li5.33Fe5.33 (P2O7) 4, the button cells also made 3.8V Voltage. This is higher than the previous iron phosphate batteries represented by LiFePO4. However, the discharge capacity of the prototype battery was 105mAh / g. This result is about 25% lower than the theoretical value of 139mAh / g and 137mAh / g of LiCoO2, which needs to be further developed and improved in the future.


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