When: November 2 @ 11:00 a.m.
Where: QNC 1501
Positive Electrode Materials and Electrode Architecture for Lithium-Ion Batteries
Abstract:
Growing battery demand is intensifying resource and environmental constraints, making battery circularity an important context for research and development. Advances in lithium-ion batteries have been driven largely by positive electrode materials. LiNi1/2Mn1/2O2 is a stable compound characterized by Ni2+ and Mn4+. Its discovery, followed by the introduction of Co, led to LiNi1/3Co1/3Mn1/3O2 and materials research in the LiNiO2–LiCoO2–LiNi1/2Mn1/2O2 solid-solution system. This materials system allows composition to be optimized for different battery requirements based on an understanding of electronic and crystal structures in relation to electrochemical behavior. Beyond NCM, materials research has expanded to Mn-based oxides with diverse oxidation states and crystal structures.
The next stage is to incorporate these materials into electrodes and batteries so that their characteristics can be effectively utilized. Battery development therefore involves designing and manufacturing electrode and battery structures that enable these materials to operate effectively. Understanding the principles governing these relationships provides a basis for integrated research connecting materials, processing, and structure. The Coaxial-Fibers Bundled Battery (CFBB) demonstrates this structural approach through a three-dimensional coaxial-fiber architecture that combines high energy density with a large facing area between positive and negative electrodes, reducing lithium-ion transport limitations. Such integration may open new opportunities for future batteries.
Biography
Yoshinari Makimura is a Fellow and General Manager of the Secondary Batteries Research-Domain at Toyota Central R&D Labs., Inc. He received his Ph.D. from Osaka City University, where he studied layered positive electrode materials, including LiNi1/2Mn1/2O2 and LiNi1/3Co1/3Mn1/3O2, under Prof. Tsutomu Ohzuku. He subsequently conducted postdoctoral research with Prof. Jean-Marie Tarascon at the Laboratoire de Réactivité et de Chimie des Solides (LRCS) in Amiens, France, and with Prof. Linda F. Nazar at the University of Waterloo.
He joined Toyota Central R&D Labs. in 2006. His career spans fundamental research on positive electrode materials, materials development, and automotive battery development. His research contributed to positive electrode technology adopted in lithium-ion batteries for Toyota hybrid electric vehicles. He currently leads research programs on next-generation batteries and battery circularity, including battery recycling, with expertise in solid-state chemistry, electrochemistry, and battery engineering.
Doors will open 15 minutes prior to the scheduled start time, with simple refreshments available. We encourage attendees to arrive early to secure their seats.