High Power Batteries

Currently, there is a growing need to improve the power performance of batteries, which would enable faster charging and improved performance of electronic devices. However, the internal kinetics of most batteries prevent the rapid transport of electrons and ions, which limits power density. We have developed hierarchical battery architectures and advanced manufacturing technologies to dramatically increase the power density of primary and secondary microbatteries by controlling ion and electron transport across nm – mm scales. We seek to further understand the limits of electron and ion transport, reduce heat generation and improve thermal transport in high power batteries, and develop high power architectures for conventionally sized batteries.

High power microbatteries:

In this project we designed and fabricated hierarchical microbatteries with unprecedented power density. The three-dimensional bicontinuous interdigitated microbattery architecture improved power performance by simultaneously reducing ion and electron transport distances through the anode, cathode, and electrolyte. The microbattery power densities were up to 7.4 mW cm-2 mm-1, which equals or exceeds that of the best supercapacitors, is 100X greater than conventional batteries, and is 2000 times higher than that of other microbatteries. Electrochemical deposition techniques improved the microbattery energy density while maintaining high power density by allowing high volume fractions of electrochemically active material to be integrated into the high power architectures.

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Figure 1: (a) A diagram of the simulated microbatteries with interdigitated electrodes that consist of an electrochemically active layer (red and yellow) coated on an electrically conductive porous bicontinuous nickel scaffold (blue). (b) Electron microscopy cross-section image of the interdigitated microbatteries. (c) A diagram depicting the important transport physics in unit cells of the lithium ion microbattery electrodes. (d) A schematic of the one dimensional model used to simulate the transport physics in the microbattery.
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Figure 2: Ragone plot showing the performance of our microbattery cells and conventional power technologies. The energy and power density of our microbattery cells (A through H) at low to high C rates, along with previous microbattery cells having 3D electrodes (MB1 through MB3). The plot also includes the performance range of conventional power technologies and commercial batteries from A123 (high power) and Sony (high energy).

High power primary microbatteries:

In this project we developed technologies for integrating high volume fractions of high capacity materials into a primary microbattery. The primary microbatteries had similar energy densities to commercially available lithium/manganese oxide based primary batteries with a ~50 X higher peak power density.

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Figure 6: (a) The microbattery design, consisting of high capacity anode and cathode chemistry integrated into an interdigitated 3D mesostructured bicontinuous architecture that enables high power and high energy density. The mesoporous cathode is conversion reaction based manganese oxide (red) coated on an electrically conductive bicontinuous nickel current collector (blue). The anode is electrodeposited lithium. (b) Scanning electron microscope images of the interdigitated electrodes. The inset shows an anode and cathode cross-section. (c) Microbattery fabrication process. Polystyrene spheres are first self-assembled on to a gold coated glass substrate followed by nickel electrodeposition through the polystyrene. The polystyrene is then etched and manganese oxide is conformally coated on the porous nickel current collector. Lithium is then densely electrodeposited on the other nickel current collector using a cesium salt based electrolyte.
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Figure 7: A Ragone plot comparing the power and energy density of two primary microbatteries (red and blue) to other technologies. The cathode half-cell (no lithium anode) is shown in black, along with recently published secondary microbatteries plotted at their highest energy density (MB1 through MB3). The plot also includes in the background the performance range of commercially available energy storage technologies and lithium/manganese oxide primary batteries from SAFT and DURACELL. The SAFT cell is plotted at the maximum energy density, 42 µWh cm-2 µm-1, and maximum recommended power, 34 µW cm-2 µm-1. The max energy and power are plotted together, despite the achievable energy at the maximum power being less than 42 µWh cm-2 µm-1, because the energy density at the max power is not reported. The primary microbatteries have comparable energy density to commercially available primary batteries and 50X higher power densities, comparable to supercapacitors.

Holographic lithography for on-chip microbattery integration:

In this project we demonstrated a high-performance microbattery suitable for large-scale on-chip integration with both microelectromechanical and complementary metal-oxide–semiconductor (CMOS) devices. Enabled by a 3D holographic patterning technique, the battery possessed well-defined, periodically mesostructured porous electrodes. Such battery architectures offer both high energy and high power, and the 3D holographic patterning technique offers exceptional control of the electrode’s structural parameters, enabling customized energy and power for specific applications.

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Figure 8: Schematic illustrations and images of 3D microbatteries enabled by combining 3D holographic and conventional photolithographies. (a) Three-dimensional microbattery fabrication process. (b) Scanning electron microscopy (SEM) cross-section of the photopatterned AZ9260 resist embedded inside the 3D holographic lattice. (c) SEM cross-section of a single digit of the interdigitated nickel scaffold. (Insets) Top-down optical micrograph (Right) and an enlarged view (Left) of the interdigitated nickel current collector (area: 4 mm2). (d) Cross-section SEM image of the interdigitated electrodes that alternate between LMO cathode (Left Inset) and Ni-Sn anode (Right Inset).


[5] James H. Pikul, Jinyun Liu, Paul V. Braun, William P. King, “Integration of high capacity materials into interdigitated mesostructured electrodes for high energy and high power density primary microbatteries.” Journal of Power Sources, vol. 315, pp. 308-315, 2016.

[4] Hailong Ning, James H. Pikul, Runyu Zhang, Xuejiao Li, Sheng Xu, Junjie Wang, John A. Rogers, William Paul King, and Paul V. Braun, ” Holographic Patterning of High Performance on-chip 3D Lithium-ion Microbatteries”, Proceeding of the National Academy of Sciences, vol. 112, no. 21, pp. 6573-6578, 2015.

[3] Jinyun Liu, Huigang Zhang, Junjie Wang, Jiung Cho, James Pikul, Eric Scott Epstein, Xingjiu Huang, Jinhuai Liu, Paul V. Braun, “Hydrothermal Fabrication of Three-Dimensional Secondary Battery Anodes”, Advanced Materials, vol. 26, no. 41, pp. 7096-7101, 2014.

[2] James H. Pikul, Huigang Zhang, Jiung Cho, Paul V. Braun, and William P. King, “High power lithium ion micro batteries from interdigitated three-dimensional bicontinuous nanoporous electrodes”, Nature Communications, vol. 4, pp. 1732, 2013

[1] Paul V. Braun, Jiung Cho, James H. Pikul, William P. King, and Huigang Zhang, “High power rechargeable batteries”, Current Opinion in Solid State & Materials Science, vol. 16, pp. 186 – 198, 2012.