CR2450 battery

The United States has developed a collision-proof and fire-proof lithium battery. In the future, bulletproof CR2450 battery will also be created.

Whether it is a laptop computer spontaneous combustion or a smartphone explosion, these 3C accidents seem to point directly to the failure of lithium CR2450 battery, causing many people to worry about whether their mobile phones have hidden explosion risks. In order to reduce public concerns, many scientists have now invested in battery explosion-proof technology. For example, the Oak Ridge National Laboratory (ORNL) in the United States guarantees that its CR2450 battery will not catch fire due to impact. On the contrary, the liquid electrolyte in it will harden and prevent the battery from deforming and exploding.

Lithium-ion CR2450 battery are the leader in energy storage technology. They are mainly composed of positive electrodes, negative electrodes, isolation membranes and electrolytes. Lithium ions migrate between the two ends of the electrodes through electrolytes. The main function of the isolation membrane is to isolate the positive and negative electrodes, prevent battery self-discharge and short circuit between the two poles, but as long as they are impacted or hit, they may cause battery short circuit or explosion.

The United States has developed a collision-proof and fire-proof lithium battery, and will also create bulletproof CR2450 battery in the future

Scientists have proposed solutions such as solid electrolytes, but solid-state CR2450 battery are expensive and less stable, and manufacturers have to greatly change the battery production process. Therefore, the Oak Ridge National Laboratory in the United States has developed a low-cost and practical battery that becomes harder when hit.

The team was inspired by the children's toy "Oobleck", which at first glance is just a plastic toy filled with corn starch solution, but it will become hard as long as it is slapped or hit. If you want to experiment further at home, you can also pour corn starch and water into a basin, stir evenly, and you can stand directly on the "water surface" and even jump on it without sinking into the water.

Adding powdered silicon dioxide (blue container) to the polymer layer (white sheet) of the electrode in the separated test battery (gold bag) will prevent lithium-ion CR2450 battery from catching fire.

This liquid is a "shear thickening fluid" in the category of non-Newtonian fluid. It can remain liquid under normal conditions. When it is impacted or stressed, the liquid structure changes, and the viscosity, hardness and volume will increase, which can greatly reduce the risk of deformation of the battery and electrodes.

However, the team certainly did not add corn starch to the battery. They added silica to the electrolyte to achieve a similar effect. Gabriel Veith, the head of the research, said that the battery electrolyte will solidify when it is hit, which can prevent the electrode from being damaged in the fall and impact of the battery. If the electrodes cannot contact each other, the battery will not easily catch fire. And the advantage of this technology is that manufacturers only need to fine-tune some of the battery processes.

The traditional battery process is to inject electrolyte and encapsulate it after the battery is completed, but if the shear thickening fluid technology is used, the electrolyte may begin to solidify during the injection, so the research first puts silica particles into the battery and then adds electrolyte.

Veith pointed out that the research used silica particles with a diameter of about 200 nanometers. If these particles are of similar size, they can be evenly distributed in the electrolyte; if the particles are of different sizes, the electrolyte will not become sticky when the battery is hit.

In order to make the battery safer and more practical, many teams are also developing silica shear thickening fluid CR2450 battery in full swing, but Veith believes that the team's new silica particles are better than previous research in terms of ease of manufacturing, resistance, reaction force and other performance.

In the future, the team will continue to improve the performance of the battery, hoping that the battery can continue to operate after being damaged by the impact. At present, the technology will first be applied to drones, and the ultimate goal is to be used in electric vehicles. The team also built bulletproof CR2450 battery for American soldiers. Veith said that the average American soldier carries 8 kilograms of CR2450 battery and bulletproof vests every day. If the battery can be used for bulletproof, the soldier will be able to reduce the burden of 8 kilograms.

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