ADVERTISEMENT

Designing Better Lithium-ion Batteries  

With the increase in world population and quality living, energy has become a significant part of our daily life. Currently, the need for energy consumption does not match with its generation. Energy storage has thus become one of the grand challenges worldwide. In recent years, lithium-ion batteries have been developed to be used in electronic devices, such as cell phones, drones, electric vehicles, laptops, and smart grids. The lithium-ion batteries store and provide energy through electrochemical reactions.

There existed many drawbacks, such as low power, slow charging, expensive, short life, and unsuitable in harsh working conditions. To overcome those, researchers have made significant efforts in developing better electrode materials. One of the most reported is vanadium pentoxide.

This material has a unique layered crystal structure that provides inserted spaces for intercalated lithium ions, a critical factor to improve the performance of a lithium-ion battery. In one of their recent work, a reach team at Texas A&M University analyzed the structures and performance of vanadium pentoxide used as electrode material.

They discovered some key characteristics that make the material suitable for electrodes. As the electrode, vanadium peroxide has three modes of lithium ion intercalation. The first is the one inserted lithium ion within a narrow potential window of 2.5-4 V; the second is two inserted lithium ions within the intermediate window of 2-4 V; the third is three inserted lithium ions within the wide window if 1.5-4 V. As we know that the electrochemical performance of a battery is dominated by how lithium ions intercalated. How do we know if a new battery is good? It turns out that there exist a couple factors that can be used as the “ruler” to measure their performance.

One of them is called the high capacity band. This term expresses a new concept about the maximum ability of the specific capacity of a V2O5 electrode. Pending on applied current densities, through a charge-discharge cycle, a series output capacity can be reached. The value of the highest capacity band for each insertion mode (of a V2O5 electrode) will reach the optimal performance. This can be illustrated as the highest peak of the specific capacity value located in the high capacity band. In those, we seek the maximum value of specific capability.

ADVERTISEMENT

Based on this discovery, we can now find the best way to design an electrode. The hints will be, for example, using hierarchical-structures to increase energy power; adding carbon materials or ions to increase energy density; and using porous current collectors to increase capacity.

Details can be found in the paper: Yuan Yue and Hong Liang, Micro- and Nano-Structured Vanadium Pentoxide (V2O5) for Electrodes of Lithium-Ion Batteries, published in the journal Advanced Energy Materials.

Speak Your Mind!

READ THIS NEXT

The Phylogenetically Diverse Microbiome Of Sturgeon Eggs Is A Potential Source Of Probiotics

Our work has two major lines of interest, the preservation of a threatened species, the sturgeon, and how bacterial communities […]

Transflammation: A New Frontier In Regenerative Medicine

Cardiovascular regeneration focuses on repairing or replacing damaged or senescent cardiac and vascular tissue. This damage is largely caused by […]

The Rhythm Of The Heart: Measuring Heart Rate Recovery In Twins

Heritage or environment: Why does the heart recover faster after exercise in some people but not in others? Scientists found […]

Work Productivity Loss In A Warming World: Developed Country Vs Developing Country

As an observed fact, global climatic warming since the Industrial Revolution has caused more frequent heat waves across the world. […]

Can We Use Entomopathogenic Fungi As Endophytes For Biological Control Of The Horse-Chestnut Leaf Miner?

The horse-chestnut leaf miner, Cameraria ohridella (Lepidoptera, Gracillariidae), is a major pest of horse-chestnut trees (Aesculus hippocastanum) in Europe. This […]

Unlocking Early Earth Processes By Examining Ancient Rocks From The North China Craton

Because planet Earth has continued to change over the past 4.5 billion years, the chemical composition and differentiation of the […]

Energy-Efficient Flexible Electrochromic Display: A Promising Trend In The Development Of Smart Displays

Traditional displays include cathode ray tube, flat panel display, liquid crystal display (LCD), and light-emitting diode (LED), which require continuous […]