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FDK and Fujitsu Labs develop high-energy-density lithium cobalt pyrophosphate cathode material for solid-state batteries

FDK Corporation and Fujitsu Laboratories Ltd. have jointly developed lithium cobalt pyrophosphate (Li2CoP2O7) as a high-energy-density cathode material for all-solid lithium-ion batteries. The new material can operate at charge/discharge voltages of more than 5V, which is beyond the limits of conventional lithium secondary batteries.

While there is active progress on improving lithium-ion and other existing batteries, development work is advancing on various types of next-generation batteries with the potential to exceed the performance of existing batteries, and all-solid-state batteries are attracting attention as next-generation batteries with superior safety performance. FDK is working on the development of all-solid-state batteries, with such characteristics as high energy density, superior safety performance, and long battery life.

Charge/discharge curves of the new cathode material. Black line: charge curve. Red line: discharge curve. Click to enlarge. Comparison of the energy densities of the new cathode material versus conventional cathode materials. New Li2CoP2O7: 860 Wh/kg. Conventional LiFePO4: 530Wh/kg (actual available capacity). Conventional LiCoO2: 570Wh/kg (actual available capacity). Click to enlarge.

The energy of a battery is a function of its voltage and capacity, and the development of an electrode material with high voltage and high capacity is one of the requirements for a battery with high energy density.

In the process of developing an all-solid-state battery, through the use of FDK’s Computer Aided Engineering (CAE) technology and Fujitsu Laboratories’ materials formation technologies, FDK and Fujitsu Laboratories succeeded in developing the lithium cobalt pyrophosphate material. The material has approximately 1.5 times the energy density of existing cathode materials for lithium-ion batteries.

Through computational physics, FDK and Fujitsu Laboratories have found that this material, when applied to all-solid-state batteries, is capable of operating with twice the energy density of existing cathode materials used in lithium-ion batteries. While working to further raise the performance of this material, the companies will continue development with the aim of an early market launch of a compact and safe all-solid-state battery that can be used in IoT applications, wearables, and mobile devices.

FDK is using an inflammable oxide-based material as a solid electrolyte in advancing its development of all-solid lithium-ion batteries with superior safety performance.



I don't see specs on the number of cycles it can run with minimal degradation.

Marshall Taylor

The top lithium ion 18650 batteries hold about 3.4 A*h (~ 0.2C). The above mentioned figure of 1.5 times the energy density results in a battery that is 5.3 A*h (almost 20 watt*hours). Wow!


For a given energy storage, this new chemistry also uses almost 50% less lithium and 75% less cobalt. (The cost of phosphorous is in the noise.)


So' anybody wanting to postpone his bolt or model 3 buying till we get this battery instead.


Or is it twice the energy density of existing lithium batteries?


Of course they don't compare it to the current available specific energy leader, NCA chemistry.


It appears to be 40% more capacity than a standard manganese cathode.

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