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Niobium Tungsten Oxide Can Be Used To Make Faster Rechargeable Batteries
- Jul 31, 2018 -

According to the 26 day of the official website of the University of Cambridge, the University's researchers wrote in the latest issue of the journal Nature that they have recently determined that niobium oxide has a higher speed of lithium, which can be used to develop a battery that can be recharged more quickly, and that the physical structure and chemical behavior of the oxide will help them to get a deep understanding of how it is. Building a safe, ultra fast charging battery.

The battery consists of three components: positive electrode, negative electrode and electrolyte. When the battery is charged, lithium ions flow out of the positive electrode and through the crystal structure and electrolyte to the negative electrode, where they are stored. The faster the process takes place, the faster the battery will charge.

When looking for new electrodes, researchers usually try to make particles smaller, but it is difficult to make practical batteries containing nanoparticles: the electrolyte can produce more unnecessary chemical reactions, so the battery life is not long, and the cost of manufacturing is very high. The niobium tungsten oxide used in the latest research has a hard and open discharge structure, which does not capture the inserted lithium, and the size of the particles is larger than that of many other electrode materials.

"Many battery materials are based on the same two or three crystal structures, but these niobium and tungsten oxides are fundamentally different," explained Kent Griffith, the first author of the study and a postdoctoral researcher at the University of Cambridge's Department of chemistry. Oxides are kept open through the oxygen 'pillar' so that lithium ions can pass through them in a three-dimensional way, which means that more lithium ions can pass through them and have faster speed. The measurement results also show that lithium ions pass through oxides at a rate of several orders of magnitude higher than that of typical electrode materials.

In addition to high lithium mobility, niobium tungsten oxides are also easy to make. "Many nanoparticle structures need multiple steps to synthesize, but these oxides are easily made, and no extra chemicals or solvents are needed," Griffith said.

Most of the negative electrodes in lithium ion batteries are made from graphite at present, and graphite has high energy density, but when charged at high ratio, the thin long lithium metal fibers, called "dendrites", are often formed, which causes short circuits and causes the battery to catch fire and even explode.

Griffith said: "in high rate applications, safety is more important than any other operating environment. These and other similar materials are absolutely noteworthy for fast charging applications requiring safer graphite substitutes.