High safety and cycling stability of ultrahigh energy lithium ion batteries

Shanhai Ge, Ryan Sheldon Longchamps, Teng Liu, Jie Liao, Yongjun Leng, Chao Yang Wang

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


High-nickel layered oxide Li-ion batteries (LIBs) dominate the electric vehicle market, but their potentially poor safety and thermal stability remain a public concern. Here, we show that an ultrahigh-energy LIB (292 Wh kg−1) becomes intrinsically safer when a small amount of triallyl phosphate (TAP) is added to standard electrolytes. TAP passivates the electrode-electrolyte interfaces and limits the maximum cell temperature during nail penetration to 55°C versus complete cell destruction (>950°C) without TAP. The downside of this reliable safety solution is higher interfacial impedance and hence lower battery power; however, thermal modulation for battery operation around 60°C can restore power completely. When cycled at 60°C, the cell stabilized with TAP achieved 2,413 cycles at 76% capacity retention. Such an unconventional combination of interface-passivating electrolyte additive with cell thermal modulation renders the most energy-dense LIBs even safer than LiFePO4 chemistry, while enjoying high power and cycling stability concurrently.

Original languageEnglish (US)
Article number100584
JournalCell Reports Physical Science
Issue number10
StatePublished - Oct 20 2021

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Engineering
  • General Energy
  • General Materials Science
  • General Physics and Astronomy


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