12/16/2023 0 Comments Yu pan silicon valley![]() Mesoporous silicon sponges have also been prepared by electrochemical etching of B-doped Si wafers, which were used to minimize the pulverization of silicon. ![]() For example, silicon nanoparticles (SiNP) were embedded in a carbon matrix through a multistep process to create nanosized void spaces for accommodating volume changes during lithiation/delithiation 18. Significant efforts have been devoted to tackling these problems by engineering Si-based electrodes at the nanoscale 5, 16, 17, 18, 19. While Si-based composites offer immense promise as new generation anode materials, extreme changes in volume during lithiation and delithiation lead to structural degradation and debilitating performance loss over time that impedes their practical application 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15. Incorporating additional components offers the potential to dramatically improve this capacity, whereby silicon can provide up to 4,200 mAh g −1 in theory. This arrangement, while commercially successful, can only deliver a maximum theoretical capacity of 370 mAh g −1 (ref. Current LIBs systems utilize graphite anodes, where energy is stored by intercalating lithium into the graphite layers. Lithium-ion batteries (LIBs) are considered the most likely energy storage configuration to satisfy these demands 2, 3 however, this requires significant advances in terms of power density, energy density, cycle life and safety, as well as lower production costs. The success of high-performance portable electronics and hybrid (or electric) vehicles strongly depends on further technological progress of commercially available rechargeable batteries 1. The excellent performance combined with the simplistic, scalable and non-hazardous approach render the process as a very promising candidate for Li-ion battery technology. ![]() Furthermore, the nanoarchitectured design lowered the contact of the electrolyte to the electrode leading to not only high coulombic efficiency of 99.9% but also maintaining high stability even with high electrode loading associated with 3.4 mAh cm −2. This hierarchical structure stabilized the solid electrolyte interphase leading to superior reversible capacity of over 1,000 mAh g −1 for 2,275 cycles at 2 A g −1. This capitalizes on covalent interaction of Si nanoparticles with sulfur-doped graphene and with cyclized polyacrylonitrile to provide a robust nanoarchitecture. To avoid the operational stability problems of silicon-based anodes, we propose synergistic physicochemical alteration of electrode structures during their design. Silicon has the potential to revolutionize the energy storage capacities of lithium-ion batteries to meet the ever increasing power demands of next generation technologies. ![]()
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