Energy-Storage System Formed through Chemical Conversions: A Cheaper, Safer Alternative to Lithium-Ion Batteries


PNL Battery Storage Systems 042016 rd1604_batteries

PNNL’s improved aqueous zinc-manganese oxide battery offers a cost-effective, environmentally friendly alternative for storing renewable energy and supporting the power grid. Source: Pacific Northwest National Laboratory

 

A team of scientists stationed at Department of Energy’s Pacific Northwest National Laboratory (PNNL) worked in conjunction with University of Washington researchers who’ve initially set out to test the viability of a rechargeable zinc-manganese oxide battery, which would be a cheaper, safer alternative to its lithium-ion brethren.

Both zinc and manganese are abundant, inexpensive materials. However lithium has become a valuable element being eyed as the future of energy storagesending prices skyrocketing to an estimated $13,000 per ton. An added benefit of this zinc-manganese alternative—it has higher energy density when compared to lead-acid batteries.

The PNNL experiment entailed building, “their own battery with a negative zinc electrode, a positive manganese dioxide electrode and a water-based electrolyte in between the two,” according to PNNL’s announcement.

The researchers repeatedly charged and discharged the battery, but early results indicated the invention was losing its storage ability after a few charging cycles. Further examination revealed the manganese component of the battery’s positive electrode begins to shed, causing the battery’s active material for energy storage to become inaccessible.

Ultimately, the team infused a new test battery with extra manganese ions to the aforementioned electrolyte in order to reduce the dissolution of the material. A new round of tests yielded a final product that could retain 92 percent of its storage capacity over 5,000 cycles with an estimated 285 milliampere-hours per gram of manganese oxide, added PNNL’s statement.

More research is needed to understand the battery’s operational capabilities, but it’s a beneficial first step in refining a renewable energy storage system.

Inventive renewable energy solutions has attracted considerable interest from both the scientific communities and tech companies. Government agencies like the Advanced Research Projects Agency-Energy (ARPA-E) are working on large-scale energy storage systems to incorporate solar capabilities into existing power grids whereas tech titan Bill Gates uses his foundation to subsidize ideas aimed at lowering greenhouse gas emissions. 

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