Approaching Theoretical Specific Capacity of Iron-Rich Lithium Iron Silicate Using Graphene-incorporation and Fluoride-doing

The lithium iron silicate, Li2FeSiO4, is a promising cathode material for lithium ion batteries due to its high theoretical specific capacity, earth abundance, low cost, and environmental friendliness. The challenges...

Electrochemically Driven Phase Transition in LiCoO2 Cathode

Lithium cobalt oxide (LiCoO2), which has been successfully applied in commercial lithium-ion batteries for portable devices, possesses a theoretical specific capacity of 274 mAh g−1. However, its actual capacity is only half of the theoretical specific capacity, because the charging voltage is restricted below 4.2 V. If a higher charging voltage is applied, an irreversible phase transition of LiCoO2 during delithiation would occur, resulting in severe capacity fading. Therefore, it is essential to investigate the electrochemically driven phase transition of LiCoO2 cathode material to approach its theoretical capacity. In this work, it was observed that LiCoO2 partially degraded to Co3O4 after 150 charging-discharging cycles. From the perspective of crystallography, the conventional cell of LiCoO2 was rebuilt to an orthonormal coordinate, and the transition path from layered LiCoO2 to cubic Co3O4 proposed. The theoretical analysis indicated that the electrochemically driven phase transition from LiCoO2 to Co3O4 underwent several stages. Based on this, an experimental verification was made by doping LiCoO2 with Al, In, Mg, and Zr, respectively. The doped samples theoretically predicted behavior. The findings in this study provide insights into the electrochemically driven phase transition in LiCoO2, and the phase transition can be eliminated to improve the capacity of LiCoO2 to its theoretical value.

Engineering and characterization of interphases for Lithium metal anode

Lithium metal is a very promising anode material in achieving high energy density for next generation battery systems due to its low redox potential and high theoretical specific capacity of...

Sulfurized Polyacrylonitrile for High-Performance Lithium Sulfur Batteries: Advances and Prospects

The lithium sulfur (Li-S) batteries have a high theoretical specific capacity (1675 mAh g-1) and energy density (2600 Wh kg-1), exerting a high perspective as the next-generation rechargeable batteries for...

Facile synthesis of vanadyl acetate one-dimensional nanobelts toward a novel anode for lithium storage

Transition metal oxides (TMOs) are prospective anode materials for lithium-ion batteries (LIBs) owing to their high theoretical specific capacity. Whereas, the inherent low conductivity of TMOs restricts its application. Given...

Review-Recent development on silicon-based anodes for high-performance Lithium-Ion Batteries

Silicon has been recognized as one of the most promising anode materials for lithium-ion batteries (LIBs) due to its high theoretical specific capacity and similar working voltage as the lithium anode. However, there are some unavoidable drawbacks including volume expansion effects, low conductivity, the constant formation of SEI during lithiation and delithiation contributes to its fewer possibilities for commercialization. Therefore, modification of silicon for better performance is required for future applications. This review demonstrates recent progress and development of modification for the silicon-based anode including silicon-carbon composite with yolk-shell structure, nanostructured silicon, and alloying method. Finally, the existing problems and future improvements are also discussed based on current development.

Stable Sodium Metal Anodes with a High Utilization Enabled by an Interfacial Layer Composed of Yolk–Shell Nanoparticles

Metallic sodium (Na) has been regarded as a promising anode for high energy rechargeable batteries owing to its high theoretical specific capacity, low redox potential, and abundant resource. However, Na...

MoS2 Encapsulated in Three-Dimensional Hollow Carbon Frameworks for Stable Anode of Sodium Ions Batteries

MoS2 is the anode material that has high expectations in sodium ion batteries, mainly due to its layered structure and high theoretical specific capacity. However, it faces drastic volume changes...

Interfacial Design of Thick Sulfur Cathodes to Achieve High Energy Density and Stability

The lithium-sulfur battery (LSB) attracts significant attention to meet the ever-growing energy demand for future technology because of the high theoretical specific capacity of sulfur. To achieve the goal of...

Cobalt-doped porphyrin-based porous organic polymer-modified separator for high-performance lithium–sulfur batteries

Lithium–sulfur (Li–S) batteries are considered as the most promising next–generation energy storage owing to their excellent theoretical specific capacity (1675 mA h g-1) and abundant availability of sulfur resources at...