Fundamental Studies on Lithium -Ion Batteries with High Specific Energy Density

• Applicants: Dr. Jie Li; Professor Dr. Martin Winter
• Subject Area: Synthesis and Properties of Functional Materials ; Physical Chemistry of Solids and Surfaces, Material Characterisation ; Theoretical Chemistry: Molecules, Materials, Surfaces
• Term: from 2018 to 2021
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 392444663

• Final Report Year: 2021

Final Report Abstract

The significant achievements can be summarized to the following four points: 1) Synthesized the Co-free Li-rich cathode material for lithium-ion batteries with the formula of Li1.2Ni0.2Mn0.6O2 and its Nb substituted alternative Li1.2Ni0.2Mn0.56Nb0.04O2; revealed the reason of enhanced electrochemical performance by Nb substitution. 2) Designed gradient particles to achieve a Li-rich cathode material with mitigated voltage decay and fabricated this type of material with a simple and controllable way. 3) studied the reasons of fast fading behavior of disordered rock-salt cathode materials when being cycled in conventional carbonated-based electrolytes, and proved that ionic liquid electrolyte has better compatibility with cation disordered rock-salt cathode material. 4) In addition, as inspired by the successful use of layered Li-rich and Li(Ni,Co,Mn)O2 (NCM) cathodes in lithium-ion batteries, beyond the objectives in the proposal, works on the layered type cathodes of sodium ion batteries, especially for those employ oxygen activities, have been carried out as well. Three compounds with different formula and structures are successfully synthesized, and the correlation between the local structure and their electrochemical performance are investigated. The mechanism studies have been involved into all above-mentioned works and special concerns have been put into the reversibility of oxygen activities.

Publications

• Insights into P2-Type Layered Positive Electrodes for Sodium Batteries: From Long-to Short-Range Order. ACS Applied Materials & Interfaces, 2020, 12(4), 5017
  Jun Wang et al.
  
• Li-rich cathodes for rechargeable Li-based batteries: reaction mechanisms and advanced characterization techniques. Energy Environ. Sci., 2020, 13, 4450
  Wenhua Zuo
  
• Preferential occupation of Na in P3-type layered cathode material for sodium ion batteries. Nano Energy, 2020, 70, 104535
  Li Zhang et al.
  
• Stabilizing P3-Type Oxides as Cathodes for High-Rate and Long-Life Sodium Ion Batteries by Disordered Distribution of Transition Metals. Small Methods, 2020,4, 2000422
  Li Zhang et al.
  
• Tailoring of Gradient Particles of Li-Rich Layered Cathodes with Mitigated Voltage Decay for Lithium-Ion Batteries. ACS Applied Materials & Interfaces, 2020, 12(39), 43596
  Xiaokang Ju
  
• Tin modification of sodium manganese hexacyanoferrate as a superior cathode material for sodium ion batteries. Electrochimica Acta, 2020, 342, 135928
  Jinke Li et l.
  
• Understanding the Effect of Nb Substitution on Li-Mn-Rich Layered Oxides. Electrochimica Acta, 2021, 390, 138801
  Jan-Paul Brinkmann, Uta Rodehorst, Jun Wang, Vassilios Siozios, Yong Yang, Martin Winter, Jie Li