An Aqueous Ca‐Ion Battery

Citations Over TimeTop 10% of 2017 papers

Abstract

Multivalent-ion batteries are emerging as low-cost, high energy density, and safe alternatives to Li-ion batteries but are challenged by slow cation diffusion in electrode materials due to the high polarization strength of Mg- and Al-ions. In contrast, Ca-ion has a low polarization strength similar to that of Li-ion, therefore a Ca-ion battery will share the advantages while avoiding the kinetics issues related to multivalent batteries. However, there is no battery known that utilizes the Ca-ion chemistry due to the limited success in Ca-ion storage materials. Here, a safe and low-cost aqueous Ca-ion battery based on a highly reversible polyimide anode and a high-potential open framework copper hexacyanoferrate cathode is demonstrated. The prototype cell shows a stable capacity and high efficiency at both high and low current rates, with an 88% capacity retention and an average 99% coloumbic efficiency after cycling at 10C for 1000 cycles. The Ca-ion storage mechanism for both electrodes as well as the origin of the fast kinetics have been investigated. Additional comparison with a Mg-ion cell with identical electrodes reveals clear kinetics advantages for the Ca-ion system, which is explained by the smaller ionic radii and more facile desolvation of hydrated Ca-ions.

Related Papers

• → Change of Anode Operation Pattern from Single to Double Staircase at Albras(2020)1 cited
• → Anode Effect Initiation during Aluminium Electrolysis in a Two-Compartment Laboratory Cell(2016)3 cited
• → Anode Effect Initiation During Aluminium Electrolysis in A Two Compartment Laboratory Cell(2016)3 cited
• The behavior of anode bubbles in aluminum electrolytic cell(2013)
• → Effect of Anode Dielectric Coating on Hall Thruster Operation(2003)