It took almost 20 years since the first experimental usage of lithium-based batteries until the 1991 first commercial launch by Sony. The market need for improved rechargeable batteries pushed researches to develop a battery whose chemistry that is based on the movement of Lithium-ion as the core charge and discharge process within the battery. The advantages of this technology include higher energy density, higher capacity and relatively low self-discharge, low maintenance as well as provide high current, which is useful for applications such as power tools and drowns.
The Lithium-ion battery performance and its safety are greatly affected by the chemistry properties of the four different components: Anode, Cathode, Electrolyte and Separator. Since its introduction to the mass market, a variety of materials for the anode, cathode and electrolyte were developed in order to cope with the technology limitations that are also susceptible to major safety issues. Such properties as high internal resistance and mechanical instability during fast charge, can lead to temperature rise, mechanical breakdowns, electrical shorts and other effects that eventually will cause the battery to first swell and then explode or catch fire.
Over recent years, as fast charging is becoming more critical for the user and due to the concerns of dealing with these issues, scientists and researchers keep working on the battery’s internal design and chemistry. While having some success in year on year improvement of the energy-density, scientists were still limited in the performance improvement which is the common goal of most leading battery manufacturers, as it does not require an increase in the current that is being delivered by the charger into the battery. Nevertheless, such high current is inevitable when fast charging a battery, but which will push known Graphite based Li-ion battery technology to its electrochemical limit.
StoreDot scientists have targeted the fast charging challenge as a major technological limit that is worth exploring, since reducing the charging time is the real game-changer for both the users and to the entire Energy Storage industry.
Complementing approaches for reducing charging times are underway in recent years and are now commercial viable in reducing the charging times. These solutions include Qualcomm's Quick Charge, Oppo’s VOOC, etc. However, such solutions do not provide the user with a viable battery. These approaches are based on system solutions that use the existing traditional Li-Ion batteries while aiming to manage the charging process in a way that minimizes and optimizes the fast charging performance of the system. Such solutions involve dynamically managing the charging profile (aka CC/CV ratios), combining different cycling models, rates, voltage levels, etc.
Nevertheless, such improvements to the charging times, do not deal with the inherent limitations of the existing Li- ion Graphite-based battery technology. This type of system solutions, while they do achieve much exposure in the media, are still limited by the same chemistry of the battery and therefore have limited potential in providing the user with a complete fast-charging solution.
Moreover, charging Graphite-based batteries in a fast mode, without modifying the core battery technology, dramatically increases the safety risks and should be carefully considered. Using such solution on a normal battery is a risky solution to the user.
All Quick Charge system solutions are an enabler to use StoreDot’s Flash Battery, and thus each introduction of such solutions is positive to StoreDot technology and promotes the need for Flash Battery introduction into the marketplace. These solutions are in need for a battery designed carefully with all four components as described above, optimized for fast charging.
StoreDot Flash Battery solution, as mentioned above, tackles the fundamental technology limitations, pushing out the operational envelope so that charging at high current is no longer a risk and the lifetime of the batteries, in terms of charge-discharge cycles, is not impacted as with Graphite-based batteries.
With the new battery chemistry that StoreDot has developed, the internal resistance, the temperature and the overall stability of the battery is under control during the entire charging process. The mechanical stability of the electrodes, which inflate and deflate during the fast charging process, is a key factor in making sure that the battery can sustain various fast charging scenarios and still retain its lon