Friday, Aug 07, 2020 | Last Update : 09:22 PM IST

136th Day Of Lockdown

Maharashtra47977931637516792 Tamil Nadu2791442210874571 Andhra Pradesh1967891128701753 Karnataka158254802812897 Delhi1415311271244059 Uttar Pradesh108974634021918 West Bengal86754610231902 Telangana7525753239601 Gujarat65704485612529 Bihar6203140760349 Assam4816233429115 Rajasthan4667932832732 Haryana3779631226448 Odisha3768124483258 Madhya Pradesh3508225414912 Kerala279561629988 Jammu and Kashmir2239614856417 Punjab1901512491462 Jharkhand140705199129 Chhatisgarh10109761369 Uttarakhand8008484795 Goa7075511460 Tripura5520367528 Puducherry4147253758 Manipur301818147 Himachal Pradesh2879171013 Nagaland24056594 Arunachal Pradesh179011053 Chandigarh120671520 Meghalaya9173305 Sikkim7832971 Mizoram5022820
  Life   More Features  19 Apr 2019  Improved recycling for lithium-ion batteries

Improved recycling for lithium-ion batteries

ANI
Published : Apr 19, 2019, 9:47 am IST
Updated : Apr 19, 2019, 9:47 am IST

Researchers improve recycling process for lithium-ion batteries.

The goal is to make this a universal recycling process for all cathode materials. (Photo: Representational/Pixabay)
 The goal is to make this a universal recycling process for all cathode materials. (Photo: Representational/Pixabay)

Washington: Researchers have improved the recycling process for lithium-ion batteries. The new process claims to be safer and uses less energy, according to a new study. The details were published in the Journal of Advanced Energy Materials.

The new recycling method involves collecting cathode particles from spent lithium-ion batteries. The mixture is then heat treated in two steps: it is first heated to 300 C, and then again heated to 850 C for several hours and then cooled naturally.

 

"Due to the rapid growth of electric vehicle markets, the worldwide manufacturing capacity of lithium-ion batteries is expected to reach hundreds of gigawatt hours per year in the next five years. This work presents a solution to reclaim the values of end-of-life lithium-ion batteries after 5 to 10 years of operation," said Chen, project lead.

Chen's team previously developed a direct recycling approach to recycle and regenerate degraded cathodes. It replenishes lithium ions that cathodes lose over extended use and restores their atomic structures back to their original states.

However, that process involves pressurizing a hot lithium salt solution of cathode particles to around 10 atmospheres. The problem is this pressurizing step raises costs and requires extra safety precautions and special equipment, said Chen.

 

So the team developed a milder process to do the same job at ambient pressure (1 atmosphere). The key was using eutectic lithium salts (a mixture of two or more salts that melts at temperatures much lower than either of its components).

"We made new cathodes from the regenerated particles and then tested them in batteries built in the lab. The regenerated cathodes showed the same capacity and cycle performance as the originals," said Yang Shi, the author.

"In an end-of-life lithium-ion battery, the cathode material loses some of its lithium. The cathode's crystal structure also changes such that it's less capable of moving ions in and out. The recycling process that we developed restores both the cathode's lithium concentration and crystal structure back to their original states," Shi said.

 

The team is tuning this process so that it can be used to recycle any type of cathode materials used in lithium-ion and sodium-ion batteries. "The goal is to make this a universal recycling process for all cathode materials. The team is also working on a process to recycle degraded anodes, such as graphite as well as other materials.” Chen said.

Tags: recycling, lithium-ion, sodium-ion, eutectic lithium salts