The battery was invented by John B. Goodenough, inventor of the lithium cobalt oxide and lithium iron phosphate electrode materials used in the lithium-ion (Li-ion) battery, and Maria H. Braga, a senior research fellow at Cockrell School of Engineering at The University of Texas. The paper describing the battery was published in Energy and Environmental Science in December 2016.
Construction and electrochemistryEdit
The battery, as reported in the original publication, is constructed using an alkali metal (lithium or sodium foil) as the positive electrode (anode), and a mixture of carbon and a redox active component, as the negative electrode (cathode). The cathode mixture is coated onto copper foil. The redox active component is either sulfur, ferrocene, or manganese dioxide. The electrolyte is a highly conductive glass formed from lithium hydroxide and lithium chloride and doped with barium, allowing fast charging of the battery without the formation of metal dendrites.
The publication states that the battery operates during discharge by stripping the alkali metal from the anode and re-depositing it at the cathode, with the battery voltage determined by the redox active component and the capacity of the battery determined by the amount of the alkali metal anode. This operating mechanism is radically different from the insertion (intercalation) mechanism of most conventional Li-ion battery materials.
In the latest design, discussed in an article in the Journal of the American Chemical Society, the cathode is coated with a special plasticiser solution to avoid interface cracking as different materials expand at different rates. Braga says that the new battery has twice the energy density of conventional lithium ion batteries, and can be recharged 23,000 times. Critics pointed out several extraordinary claims made by the paper, such as a record-high relative dielectric constant; perhaps higher than any material ever recorded, and a raise in the capacitance of the battery over many charge cycles, rather than a decrease as is usually the case with all other battery technologies. The paper was also not clear if the battery could hold its charge once unplugged or not. Braga responded to critics, saying "Data is data and we have similar data from many different cells, in four different instruments, different labs, glove box. And at the end of the day, the LEDs are lit for days with a very small amount of active material after having cycled for more than 23,000 times".
Comparison with lithium-ion batteriesEdit
Braga and Goodenough have stated that they expect the battery to have an energy density many times higher than that of current lithium-ion batteries, as well as an operating temperature range down to −20 °C (−4 °F); much lower than current solid-state batteries. The electrolyte is also stated to have a wide electrochemical window. The battery's design is safer than lithium-ion batteries, as the use of a flammable liquid electrolyte is avoided. The battery can also be made using low-cost sodium instead of lithium.
The authors claim the battery has a much shorter charging time than Li-ion batteries - in minutes rather than hours. The authors also state that they have tested the stability of the alkali metal/electrolyte interface over 1,200 charge cycles with low cell resistance; the specification for Li-ion batteries is usually less than a thousand.
The publication was initially met with considerable skepticism by other researchers in battery technology, with several noting that it is unclear how a battery voltage is obtained given that pure metallic lithium or sodium exists on both electrodes, which should not produce a difference in electrochemical potential, and therefore give no cell voltage. Any energy stored or released by the battery would therefore violate the first law of thermodynamics. Goodenough's high reputation was enough to deter the strongest criticism however, with Daniel Steingart of Princeton University commenting, "If anyone but Goodenough published this, I would be, well, it's hard to find a polite word." A formal comment was published by Steingart and Venkat Viswanathan from Carnegie Mellon University in E&ES.
Goodenough responded to the skepticism, stating: "The answer is that if the lithium plated on the cathode current collector is thin enough for its reaction with the current collector to have its Fermi energy lowered to that of the current collector, the Fermi energy of the lithium anode is higher than that of the thin lithium plated on the cathode current collector." Goodenough went on to say in a later interview with Slashdot that the lithium plated on the cathode is on the "order of a micron thick".
Goodenough's response has drawn further skepticism from Daniel Steingart and also Matthew Lacey of Uppsala University, who point out that this effect is only known for extremely thin layers (monolayers) of materials. Lacey also notes that the original publication does not mention a limit to the thickness of the lithium plated on the cathode, but instead states the opposite: that the capacity of the cell is "determined by the amount of alkali metal used as the anode".
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