Solomon Oyakhire is a PhD candidate in the department of chemical engineering. He received his BSc in chemical engineering at the University of Lagos in Nigeria before starting his PhD in chemical engineering as a Knight-Hennessy scholar. He is primarily interested in the scientific and economic facets required for accelerating the deployment of renewable energy technologies. Prior to Stanford, he carried out research on phase change materials applied in solar thermal heating systems at the University of Lagos and worked as a technology consultant at KPMG. By operating with frameworks that he gathered from research and consulting environs, he is currently working on developing high energy density batteries with practical applications in the grid and electric vehicles.
Electrical resistance of the current collector controls lithium morphology.
2022; 13 (1): 3986
The electrodeposition of low surface area lithium is critical to successful adoption of lithium metal batteries. Here, we discover the dependence of lithium metal morphology on electrical resistance of substrates, enabling us to design an alternative strategy for controlling lithium morphology and improving electrochemical performance. By modifying the current collector with atomic layer deposited conductive (ZnO, SnO2) and resistive (Al2O3) nanofilms, we show that conductive films promote the formation of high surface area lithium deposits, whereas highly resistive films promote the formation of lithium clusters of low surface area. We reveal an electrodeposition mechanism in which radial diffusion of electroactive species is promoted on resistive substrates, resulting in lateral growth of large (150m in diameter) planar lithium deposits. Using resistive substrates, similar lithium morphologies are formed in three distinct classes of electrolytes, resulting in up to ten-fold improvement in battery performance. Ultimately, we report anode-free pouch cells using the Al2O3-modified copper that maintain 60 % of their initial discharge capacity after 100 cycles, displaying the benefits of resistive substrates for controlling lithium electrodeposition.
View details for DOI 10.1038/s41467-022-31507-w
View details for PubMedID 35821247
- A Solution-Processable High-Modulus Crystalline Artificial Solid Electrolyte Interphase for Practical Lithium Metal Batteries ADVANCED ENERGY MATERIALS 2022
- Understanding and Utilizing Reactive Oxygen Reservoirs in Atomic Layer Deposition of Metal Oxides with Ozone CHEMISTRY OF MATERIALS 2022
- Methyl-methacrylate based aluminum hybrid film grown via three-precursor molecular layer deposition JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A 2022; 40 (2)
- Graphene coating on silicon anodes enabled by thermal surface modification for high-energy lithium-ion batteries MRS BULLETIN 2022
- Scalable, Ultrathin, and High-Temperature-Resistant Solid Polymer Electrolytes for Energy-Dense Lithium Metal Batteries ADVANCED ENERGY MATERIALS 2022
Suspension electrolyte with modified Li+ solvation environment for lithium metal batteries.
Designing a stable solid-electrolyte interphase on a Li anode is imperative to developing reliable Li metal batteries. Herein, we report a suspension electrolyte design that modifies the Li+ solvation environment in liquid electrolytes and creates inorganic-rich solid-electrolyte interphases on Li. Li2O nanoparticles suspended in liquid electrolytes were investigated as a proof of concept. Through theoretical and empirical analyses of Li2O suspension electrolytes, the roles played by Li2O in the liquid electrolyte and solid-electrolyte interphases of the Li anode are elucidated. Also, the suspension electrolyte design is applied in conventional and state-of-the-art high-performance electrolytes to demonstrate its applicability. Based on electrochemical analyses, improved Coulombic efficiency (up to ~99.7%), reduced Li nucleation overpotential, stabilized Li interphases and prolonged cycle life of anode-free cells (~70 cycles at 80% of initial capacity) were achieved with the suspension electrolytes. We expect this design principle and our findings to be expanded into developing electrolytes and solid-electrolyte interphases for Li metal batteries.
View details for DOI 10.1038/s41563-021-01172-3
View details for PubMedID 35039645
- Rational solvent molecule tuning for high-performance lithium metal battery electrolytes NATURE ENERGY 2022
- Capturing the swelling of solid-electrolyte interphase in lithium metal batteries. Science (New York, N.Y.) 1800; 375 (6576): 66-70
- Revealing and Elucidating ALD-Derived Control of Lithium Plating Microstructure ADVANCED ENERGY MATERIALS 2020
- Applications of atomic layer deposition and chemical vapor deposition for perovskite solar cells ENERGY & ENVIRONMENTAL SCIENCE 2020; 13 (7): 1997–2023