![]() Graphene: A promising candidate for charge regulation in high-performance lithium-ion batteries. Co-free layered cathode materials for high energy density lithium-ion batteries. Mitigation of voltage decay in Li-rich layered oxides as cathode materials for lithium-ion batteries. Commercialization of lithium battery technologies for electric vehicles. Challenges for rechargeable Li batteries. ![]() This low-temperature strategy of synthesizing single-crystal LiNi 0.8Co 0.1Mn 0.1O 2 rods should be able to provide a feasible method for synthesizing other single-crystal Ni-rich cathode materials with excellent electrochemical performances for LIB.Īrmand, M. These superior electrochemical properties should be related to the monodispersed micron scaled morphology which not only decreases the contact area between electrode and electrolyte but also mitigates the formation of microcracks. The cycling stability at high cut-off voltage is also outstanding. When charge-discharged at 1 C for 100 cycles, discharge capacity of 178.1 mAh/g with the capacity retention of 95.1% are still obtained. When sintered at 750 ☌ with 50% Li-excess, the cathode material delivered an initial discharge capacity of 226.9 mAh/g with Coulombic efficiency of 91.2% at 0.1 C (1 C = 200 mA/g) in the voltage range of 2.8–4.3 V. When used as the cathode material for LIBs, the as-prepared LiNi 0.8Co 0.1Mn 0.1O 2, with ordered layered-structure and low degree of cation mixing, shows excellent electrochemical performances. Compared with conventional synthesis methods, these LiNi 0.8Co 0.1Mn 0.1O 2 rods were calcined at a low temperature with excessive lithium sources, which not only reduces the sintering temperature but also ensures the mono-dispersed micrometer-scaled particle distribution. To deal with these issue, single-crystal pm-sized LiNi 0.8Co 0.1Mn 0.1O 2 rods was synthesized by a hydrothermal method. However, the anisotropic lattice volume changes linked to their α-NaFeO 2 structured crystal grains bring about poor cycle performances for conventionally produced NCM materials. It is shown that the stability and lifetime of NCM materials, and therefore battery performance, can be improved by using lower amounts of nickel and using single crystals.With high reversible capacities of more than 200 mAh/g, Ni-rich layered oxides LiO 2 ( x ≥ 0.6) serve as the most promising cathode materials for lithium-ion batteries (LIBs). The first section observes the impact of chemical composition, while the second section explores NCM particles made up of multiple crystals versus one single crystal. This thesis compares various NCM materials to figure out what guidelines can improve battery performance. Lithium layered nickel cobalt manganese oxides (NCM) are a popular choice of cathode material, but they still suffer from problems such as cation mixing, volume changes, microcracking, surface side reactions, high temperature performance issues and structural changes. ![]() Nevertheless, further improvements are required to match or exceed the performance of regular vehicles, such as higher energy density, faster charging speed, longer lifetime, better safety and lower cost. The revolutionary rechargeable lithium-ion battery paves the way for environmentally-friendly applications such as electric vehicles. It is shown that the stability and lifetime of NCM materials, and therefore battery performance, can be improved by using lower nickel composition and single crystal morphology. The first section observes the impact of chemical composition, while the second section explores conventional polycrystalline versus single crystal morphology for NCM. This thesis compares various NCM materials to figure out what guidelines should be followed to improve performance. Lithium layered nickel cobalt manganese oxides (NCM) are a popular choice of cathode material, but they still suffer from problems such as cation mixing, volume changes, microcracking, surface side reactions, high temperature performance issues and structural reconstruction. Nevertheless, further improvements are required to match or exceed the performance of conventional internal combustion engine vehicles, such as higher energy density, faster charging speed, longer lifetime, better safety and lower cost.
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