Nanoarray electrodes are particularly investigated for power source in microelectronics, which requires high rates, high areal capacity/capacitance and long cycle stability. When the battery electrode materials are designed into nanostructures (e.g., 1D array, 2D nanosheets), the pseudocapacitive effect may become dominating and can boost the power performance. In addition, choosing layered materials with single-phase solid-solution reaction with metal ions is also useful to enhancing the fast charging capability. Our group has been actively working on array-type nanomaterials that are grown directly on conductive substrates as the electrodes of metal-ion batteries. In this talk, I will present the following:

(1) demonstration of vanadium based intercalation-type cathode (e.g., V₂O₅, NVOPF) and tin based alloy-type anodes in Na-ion storage. Zn-ion batteries based on ZOV cathode and 3D Zn anode with high cyclic stability will also be discussed. These examples demonstrate effectiveness of nanostructure design to boost specific power (i.e., maintaining decent capacity at high discharge currents).

(2) hybrid capacitors (one battery-type electrode and the other capacitive-type electrode) that deliver high-power performance.

(3) Design of electrocatalytic bi-functional cathodes for metal-air batteries that have significantly capacity retentions and flexibility upon long cycles.

Keywords: Na-ion battery, Zn-ion battery, hybrid battery, pseudocapacitive effect, high power energy storage.

References:

• Dongliang Chao, et al., Adv. Mater. DOI: 10.1002/adma.201804833.
• Ming Song, et al. Funct. Mater. Invited Review, DOI: 10.1002/adfm.201802564.
• Dongliang Chao, et al, Mater. (2018), DOI: 10.1002/adma.201803181.
• Dongming Xu, et al., Energy Mater. DOI: doi.org/10.1002/aenm.201702769.
• Huanwen Wang, et al, Non-Aqueous Hybrid Lithium and Sodium Ion Capacitors, Adv. Mater. 1702093 (2017)