SURFACE MODIFICATION TO IMPROVE THE ELECTROCHEMICAL PERFORMANCE OF CATHODE MATERIALS FOR LITHIUM-ION BATTERIES AND SODIUM-ION BATTERIES

<p>"The specific capacity of active materials as well as their cycling stability are the main limiting factors for the performance of lithium-ion batteries (LIBs) and sodium-ion batteries (SIB). Atomic layer deposition (ALD) is considered as a promising surface modification method to enhance the electrochemical performance of active materials for LIBs and SIBs.</p> <p>In this research, we are committed to using ALD to modify the cathode materials of LIB, by coating different films on the surface of different cathode materials and constructing a stable and favorable interface layer for lithium-ion transport, so that we can protect the active materials from the influence of organic liquid electrolytes, improve the electrical and ionic conductivity of active materials, and lead to the electrochemical performance enhancement of the materials. My first research explained how the composite AlF₃-Al₂O₃ film obtained by ALD enhanced the electrochemical performance of Li_1.2Mn_0.54Co_0.13Ni_0.13O₂ (LRNMC). My second work described a strategy of applying ALD to remove the undesirable by-products on the surface of Ni-rich cathode materials, LiNi_0.8Mn_0.1CO_0.1 (NMC811), due to exposure to humidity, and recovery the electrochemical performance of NMC811. On the basis of our study, the surface modification places an important role in the electrochemical performance improvement"--Abstract, p. iv</p>

Name thesis:degree_name

Ph. D. in Chemical Engineering

Grantor

Missouri University of Science and Technology

Author dc:creator

• Yu, Han

• Atomic layer deposition
• Lithium ion battery
• Sodium ion battery
• Solid state electrolyte
• Chemical Engineering
• Engineering

Repository record dc:identifier

https://scholarsmine.mst.edu/doctoral_dissertations/3211

OAI identifier oai:identifier

oai:scholarsmine.mst.edu:doctoral_dissertations-4216