Electric vehicle lithium battery internal image

While hybrids and electric cars are getting more attention, lithium batteries are also in the spotlight. Recently, Japanese researchers successfully photographed the inside of a lithium battery and immediately attracted widespread attention.

Recently, Professors Hiroshi Kawamura and Iwai Ryo, from the Institute of Multi-Materials Science, Tohoku University, Japan, successfully used magnetic resonance imaging (MRI) to image internal tomographic images of lithium-ion rechargeable batteries and successfully detected lithium ions in image form. The interior of rechargeable batteries is the first in the world, and the use of magnetic resonance imaging for lithium-ion rechargeable batteries is the first in the world.

First of all, the principle of magnetic resonance imaging should be explained: the electric wave is irradiated to the object in a strong magnetic field, and the weak electric wave returned by the spin of the atomic nucleus is detected, and then drawn into an image.

However, since the lithium ion rechargeable battery case is made of metal, the inside also contains a large amount of metal. In the past, radio waves could not penetrate the lithium ion rechargeable battery, so the internal image detection of the lithium ion rechargeable battery was difficult to take. The research team at Tohoku University in Japan produced a lithium-ion rechargeable battery with a glass and plastic casing, and carefully designed the electrode configuration according to the conventional battery. Therefore, the inside of the lithium ion rechargeable battery was successfully captured by magnetic resonance imaging.

In addition to capturing lithium ion magnetic resonance images with low sensitivity and difficulty in detection, images of hydrogen nuclei and protons were obtained. The resolution of the image was 16μm and 65,000 pixels, and the lithium ion image was 32μm resolution and 16,000 Pixel.

What is the purpose of the captured image? With this technology, it is possible to detect the lithium ion distribution inside the lithium ion rechargeable battery, the decomposition of the electrolyte during repeated charge and discharge, and the generation of gas in the form of magnetic resonance imaging. Specifically, the risks of heat and fire caused by incorrect use of lithium-ion rechargeable batteries can be understood, and the structural reasons can be further understood, so as to develop safer and anti-aging lithium-ion rechargeable battery technology.

The research team also said that their next goal is to take a three-dimensional video of the lithium ion flow inside the lithium-ion rechargeable battery and the aging of the electrolyte, in order to conduct more relevant research.

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