Battery aging is reasonable for rapid charging or not "battery killer"

ଲେଖକ: ଆଇଫ୍ଲୋପାୱାର - Soláthraí Stáisiún Cumhachta Inaistrithe

According to reports, a recent research on the micro-small particles of the Lithium-ion battery electrodes in NASTRACE, the battery is quickly charged and then used for high-power fast power consumption, the damage of the battery may not be as bad as the researchers And the benefits of slow charging and power consumption may also be exaggerated. The results of this study challenged the "super charging" battery than slow charging to electrodes as demanded views, from Stanford University and the US Department of Energy SLAC National Accelerator Lab Stanford University Materials and Energy Science (SIMES) Say. They also represent scientists or may change the battery electrode or change the charging method to enhance the battery life.

"The details of the chemical process that occur during the electrodes during charging and discharging are only one of the many factors of the battery life, but this factor has not been fully understood before this study," Research advanced author, Stanford University Material Science And the assistant professor of the School of Engineering, SiMes said this. "We discovered a new perspective studying battery aging. "These research results can be applied directly to many modern commercial lithium-ion batteries, oxides and graphite electrodes.

This study was published on September 14th "Natural Materials". The research team also includes research collaborators from the US MIT, the United States Sandia National Laboratory, South Korea Samsung Top Technology and the American Lawrence Berkeley National Laboratory. An important reason for observing the loss of ion battery in the battery is to expand and shrink when the ions absorbed and released in the electrolyte during charging and discharging.

In this study, scientists studied positive electrodes consisting of billion lithium iron phosphate nanoparticles. If most or all ions are active to participate in charging and discharging, they will relatively uniformly absorb and release ions. However, if only a small part of the particles absorb all ions, they are more likely to rupture and damage, reduce the life of the battery.

The characteristics and behaviors of nanoparticles are conflicted with each other. In order to further investigate the truth, the researchers have made small coin batteries, which use different currents to charge them, and quickly separate them and flush the assembly to prevent the charging / discharge process. Subsequent scientists cut the electrodes very thin and send them to the Berkeley National Laboratory with the intensive X lines of the advanced light source synchronization accelerator.

Fast discharge new inspection "We can study thousands of electrode nanoparticles and shoot the snapshot of different stages during charging and discharge," said the chief author of the study, Stanford University, Li Yiyang (Yiangli) said this. "This study is the first detailed and comprehensive investigation of charge and discharge process under different charging and discharge conditions. "By analyzing data by using MIT research and development, researchers have found only small part of the nanoparticles absorb and release ions during charging, even if this process occurs very rapidly.

However, when the battery is discharged, interesting things happen: as the discharge rate has more than a certain limit, more and more particles begin to synchronize the ion, transform into a more unified, less damage to less. This indicates that scientists may be able to distort the electrode material or this process to ensure longer battery life, or faster charging and discharging rates. According to Li, the next step is to run the battery electrode for hundreds or even thousands of cycles to simulate the real world.

Scientists hope to take a snapshot of the battery during charging and discharging, not interrupting this process and separating battery components. This should be more realistic, and this process can be performed in the synchronous accelerator, such as the ALS or SLAC Stanford synchronous accelerator radiation light source. Li also said that the research team is working closely with the industrial community, investigating how these findings will be applied to transportation and electronic consumer product fields.

This study received the Global Innovation Development Project of the South Korea Samsung Top Technology, Stanford Engineering College and the Prestocate Energy Academy, Samsung-Mit Energy Application Material Design Project and Fund Support for US Department of Energy. .