High Volumetric Energy and Power Density Li2TiSiO5 Battery Anodes via Graphene Functionalization

Jin Myoung Lim, Sungkyu Kim, Norman S. Luu, Julia R. Downing, Mark T.Z. Tan, Kyu Young Park, Jacob C. Hechter, Vinayak P. Dravid, Kai He, Mark C. Hersam

Research output: Contribution to journalArticlepeer-review

Abstract

As electric vehicles increase in size and range, volumetric energy density and high rate capability have emerged as critical Li-ion battery performance metrics. While graphite has been the leader for Li-ion battery anodes for the past two decades, this material has severe limitations at high rates due to overpotentials that result in Li dendrite growth and significant safety issues. As an alternative to graphite, Li2TiSiO5 (LTSO) nanoparticles possess intrinsically high gravimetric energy densities and high rate capability with minimal risk for Li dendrite growth. However, pristine LTSO nanoparticles possess poor electrical conductivity and electrode packing density, which have prevented their full potential from being realized in Li-ion batteries. Here, LTSO nanoparticles are conformally coated with graphene using a scalable cellulose-based solution process, which enables low overpotential and dense electrode packing, resulting in exceptional volumetric energy densities at high rates.

Original languageEnglish
Pages (from-to)522-533
Number of pages12
JournalMatter
Volume3
Issue number2
DOIs
Publication statusPublished - Aug 5 2020

Keywords

  • MAP4: Demonstrate
  • anode
  • high rate
  • in situ transmission electron microscopy
  • lithium-ion battery
  • solid-electrolyte interphase
  • volumetric energy density

ASJC Scopus subject areas

  • Materials Science(all)

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