The development of energy-dense all-solid-state Li-based batteries requires positive electrode active materials that are ionic conductive and compressible at room …
This review presents a new insight by summarizing the advances in structure and property optimizations of battery electrode materials for high-efficiency energy storage. In-depth understanding, efficient optimization strategies, and advanced techniques on electrode materials are also highlighted.
For positive electrode materials, in the past decades a series of new cathode materials (such as LiNi 0.6 Co 0.2 Mn 0.2 O 2 and Li-/Mn-rich layered oxide) have been developed, which can provide a capacity of up to 200 mAh g −1 to replace the commercial LiCoO 2 (∼140 mAh g −1).
Schmidt et al. estimated the internal temperature of a pouch battery by measuring the change of real part of electrochemical impedance. In addition to the temperature, the electrochemical impedance is also relevant to SOC in certain range of frequency.
A main parameter used to describe the structure of a battery composite electrode is the porosity. A positive composite electrode is typically composed of active material (AM), a conductive agent (in this study, carbon black (CB) ), and a binder, altogether coated on a metallic current collector (Figure 1).
In a real full battery, electrode materials with higher capacities and a larger potential difference between the anode and cathode materials are needed.
Some important design principles for electrode materials are considered to be able to efficiently improve the battery performance. Host chemistry strongly depends on the composition and structure of the electrode materials, thus influencing the corresponding chemical reactions.