ReviewA review of lithium and non-lithium based solid state batteries
Section snippets
Introduction and background
The advent of solid state batteries must be understood in the context of the challenges faced by modern storage systems, especially Li-ion batteries. Existing Li-ion batteries, apart from the storage and active components, contain considerable quantities of auxiliary materials and cooling equipment [1]. Loss of battery quality due to continuous charging and discharging cycles, flammability, dissolution of the electrolyte, and from vehicle to grid utilization has been another important concern.
Solid state batteries
A solid state battery is similar to a liquid electrolyte battery except in that it primarily employs a solid electrolyte. The parts of the solid state Li ion battery include the anode, cathode and the solid electrolyte [22], [23]. The anode is attached to copper foil, which helps improve the electrical conductivity of the battery. [22]. During the charging cycle, there is movement of the Li ions of the LiCoO2 crystal toward the electrolyte interface [22], [24]. As a result, the Li ions cross
Thin film solid state batteries
Nanomaterials and thin films are capable of suitable utilization, thanks to their enhanced properties. Nanoscale electrolytes prepared in the form of thin films offer high energy density (research on active electrode and electrolytic materials currently puts the theoretical energy densities at about 200 Wh kg−1), a longer lifetime, flexibility, and extreme lightness, which tends to reduce the overall weight of the system [159]. Thin film battery systems, especially Li based systems, are already
Lithium based solid state batteries
Much research has concentrated on the study of lithium and lithium ion based solid state batteries, mostly devoted to the study of different lithium ion based electrolyte systems and how the solid state batteries perform with these systems. Lithium based solid state electrolytic systems fall into the following categories. Table 1 presents a summary of the types of anode, cathode, and electrolytes used in solid state batteries and their respective open circuit voltage and electrical outputs.
Non-lithium based solid state batteries
Non-lithium based solid state electrolytes have been used extensively to study the functioning and performance of solid state batteries. Ceramics are some of the most common non-Li based solid state electrolytes [258]. These solid electrolytes usually conduct ions by the translation of point defects, and energy is required in the process. This makes them good conductors at higher temperatures, as the high temperature provides the necessary energy for the process [99], [258]. Phosphates such as
Polymer electrolyte based solid state batteries
Several researchers have conducted studies of polymer electrolyte based solid state batteries. The history of polymer based electrolytes starts with the reporting of conductivities of polyethylene oxide (PEO) alkali metal salt complexes by Wright et al. [306]. PEO based polymers have been widely used since then as solid state electrolytes [307]. The most commonly used solid state electrolyte system is PEO and polypropylene oxide complexed with Li salts. The prevalence of PEO based systems has
Conclusion
There has been a tremendous recent increase in the amount of research and understanding of solid state batteries, especially in the last two decades. Most of the work has focused on developing solid state battery systems with enhanced energy and power densities. Cathodes and anodes with good microstructural properties are being developed to provide good electrochemical and ionic conduction pathways. However, some fundamental challenges remain. A primary challenge is the high cost of production,
Acknowledgment
This work was supported by the DGIST R&D Program of the Ministry of Education, Science, and Technology of Korea (15-BD-01).
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These authors contributed equally to this work.