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High-energy cathodes 18.10.2016

Dr. Jie Li during laboratory activities in the drying room
© WWU/MEET

New Materials for lithium ion batteries

A research group working in the project KaLiPat to make materials for

high-energy cathodes of lithium ion batteries more durable and cheaper.

The project focus is the synthesis, modification and characterization of

the materials.

Project status Construction and Optimisation of the synthesis route
Examples application areas electric vehicles, stationary energy storage, portable consumer electronics, power tools
Project duration May 2012 until October 2017

Lithium-ion batteries currently constitute the most advanced rechargeable battery system, which serves a vast field of applications including portable electronics, power tools and in the near future possibly also stationary energy storage and electric vehicles. In the course of the KaLiPat project, the young research group of Dr. Jie Li at the MEET battery research center of the University of Münster develops high-energy, low-cost and long-life cathode materials for lithium-ion batteries and works on the deep understanding of their electrochemical behavior. In the course of this work, a microwave-assisted solid-state/hydrothermal synthesis method will be established. Through the comparison of various synthesis routes, the most proper method for up-scaling and commercialization will be determined. Based on this, the modification of high-capacity lithium-rich cathodes by surface coating or variation of the composition will be put into practice. Within this context, the correlation between the particle morphology / particle size of the synthesized cathode materials and  the  resulting electrochemical performance shall also be investigated.

Realisation of an energy saving synthesis route

The development of high-energy, low-cost and long-life cathode material for lithium ion batteries attracts more and more research interest recently. As the most promising cathode candidate to match these requires, the solid solutions of layered Li2MnO3 and Li-Mn-Ni-Co-O2 (also widely being referred to as lithium-rich cathodes) are being proposed in the course of this project. Beside this, the realization of  a novel synthesis route of these materials which is fast, convenient and energy saving is also a objective of this project. The work started with particle morphology control and modification,  aging investigations of novel lithium silicate cathode, meanwhile the optimization of microwave assited synthesis.

  • Loading samples to X-ray diffractometer. © WWU/MEET
  • Operation of a battery line. © WWU/MEET
  • Cell testing in climatic chambers. © WWU/MEET
  • Ragone plot of cathode materials for lithium-ion batteries. © WWU/MEET
  • Electron microscopic  image of hollow-structure cathode material. © WWU/MEET
  • Dr. Jie Li during laboratory activities in the drying room © WWU/MEET

Aging investigation of Li-rich cathodes

The project started with particle control and modification of Li-rich cathode material, aging investigation of novel lithium silicate cathode, meanwhile the optimization of microwave-assited synthesis of LMNO high voltage spinel cathode. The microwave reactors for both hydrothermal and high temperature approach, high pressure reactor and VSP electrochemical station were set up in the lab and part of the parameters have been sucessfully optimized.

Concerning  the results, the rate capability and specific capacity of Li-rich cathode was improved via both surface modfication and electrochemical treatment.  Hollow structures of Li-rich cathode were successfully synthesized and  exhibit  improved electrochemical performances. The  aging behaviour of lithium iron silicate cathode in fluorine-based electrolyte was proposed. The  LMNO spinel cathode was sucessfully prepared by microwave hydrothermal assisted route and exhited good rate capability.

Sub-projects

  • Particle modification of Li-rich cathode material
  • Synthesis of Hollow sphere nano-structure cathode material
  • Synthesis of LNMO high voltage cathode material via microwave assisted route
  • Full cell assembly and test
  • Aging behaviour of Li2FeSiO4 cathode material

Supported by: The Federal Government on the basis of a decision by the German Bundestag

Dates

no news in this list.

Addresses

Coordinator
  • Dr. Jie Li
    MEET Batterieforschungszentrum / Institut für physikalische Chemie, Westfälische-Wilhelms-Universität Münster
Other Addresses

Infobox

Research funding

The information system EnArgus provides information on research funding, including on this project (German only).