Nanostructured electrode materials for lithium-ion and sodium-ion batteries via electrospinning

Layered Li1.2Mn0.56Ni0.16Co0.08−xAlxO2 (0 ≤ x ≤ 0.08) cathode materials were successfully synthesized by a sol-gel method. X-ray diffraction and the refinement data indicate that all materials have typical α-NaFeO2 structure with R-3m space group, and the a-axis has almost no change, but there is a slight decrease in the c lattice parameter as well as the cell volume. Scanning electron microscopy and high resolution transmission electron microscopy prove that all the samples have uniform particle size of about 200-300 nm and smooth surface. The energy-dispersive X-ray spectroscopy mapping shows that aluminum has been homogeneously doped in the Li1.2Mn0.56Ni0.16Co0.08O2 cathode material. The cyclic voltammetry and electrochemical impedance spectroscopy reveal that appropriate Al-doping contributes to the reversible lithium-ion insertion and extraction, and then reduces the electrochemical polarization and charge transfer resistance. Li1.2Mn0.56Ni0.16Co0.08−xAlxO2 (x = 0.05) shows the lowest charge transfer resistance and the highest lithium-ion diffusion coefficient among all the samples. The Li-rich electrodes with low-level Al doping shows a much higher discharge capacity than the pristine one, especially the Li1.2Mn0.56Ni0.16Co0.08−xAlxO2 (x = 0.05) sample, which exhibits greater rate capacity and better fast charge-discharge performance than the other samples. Li1.2Mn0.56Ni0.16Co0.08−xAlxO2 (x = 0.05) also exhibits higher discharge capacity than the pristine one at each cycle at 55°C. These results clearly indicate that the high rate capacity together with a good high rate cycling performance and high-temperature performance of the low-Co Li1.2Mn0.56Ni0.16Co0.08−xAlxO2 (x=0.05) is a promising alternative to next-generation lithium-ion batteries.

Section: Introductionmentioning

confidence: 99%

Enhanced electrochemical performance of Li-rich low-Co Li1.2Mn0.56Ni0.16Co0.08−x Al x O2 (0≤x≤0.08) as cathode materials

Han

Yang

et al. 2016

“…These improvements promote the development of Al-based chemistry and enrich the electrochemical energy storage devices. For rechargeable LIBs [271,272], the lithiation-induced strain in electrodes often give rise to high stress, fracture, and capacity fade. By surface modification of Al2O3, AlF3, AlPO4, ect.…”

Section: Discussionmentioning

confidence: 99%

Aluminum-based materials for advanced battery systems

Qiu

Zhao

et al. 2017

There has been increasing interest in developing micro/nanostructured aluminum-based materials for sustainable, dependable and high-efficiency electrochemical energy storage. This review chiefly discusses the aluminum-based electrode materials mainly including Al2O3, AlF3, AlPO4, Al(OH)3, as well as the composites (carbons, silicons, metals and transition metal oxides) for lithium-ion batteries, the development of aluminum-ion batteries, and nickel-metal hydride alkaline secondary batteries, which summarizes the methodologies, related charge-storage mechanisms, the relationship between nanostructures and electrochemical properties found in recent years, latest research achievements and their potential applications. In addition, we raise the relevant challenges in recently developed electrode materials and put forward new ideas for further development of micro/nanostructured aluminum-based materials in advanced battery systems.

“…However, similar to other anodes with high capacity such as silicon [7][8][9], large volume change (more than 300%) during lithiation and delithiation process leads to severe pulverization of electrode, aggregation of SnO 2 particles and formation of unstable solid electrolyte interphase (SEI) film, thus resulting in fast capacity fading. So far, two main strategies have been applied to resolve the abovementioned problems.…”

Section: Introductionmentioning

confidence: 99%

Oxygen-doped carbon host with enhanced bonding and electron attraction abilities for efficient and stable SnO2/carbon composite battery anode

Zhang

Liu

et al. 2018

The coupling between electrochemically active material and conductive matrix is vitally important for high efficiency lithium ion batteries (LIBs). By introducing oxygen groups into the nanoporous carbon framework, we accomplish sustainably enhanced electrochemical performance for a SnO 2 /carbon LIB. 2-5 nm SnO 2 nanoparticles are hydrothermally grown in different nanoporous carbon frameworks, which are pristine, nitrogen-or oxygen-doped carbons. Compared with pristine and nitrogen-doped carbon hosts, the SnO 2 /oxygen-doped activated carbon (OAC) composite exhibits a higher discharge capacity of 1,122 mA h g −1 at 500 mA g −1 after 320 cycles operation and a larger lithium storage capacity up to 680 mA h g −1 at a high rate of 2,000 mA g −1 . The exceptional electrochemical performance originated from the oxygen groups, which could act as Lewis acid sites to attract electrons effectively from Sn during the charge process, thus accelerating reversible conversion of Sn to SnO 2 . Meanwhile, SnO 2 nanoparticles are effectively bonded with carbon through such oxygen groups, thus preventing the electrochemical sintering and maintaining the cycling stability of the SnO 2 /OAC composite anode. The high electrochemical performance, low biomass cost, and facile preparation renders the SnO 2 /OAC composites a promising candidate for anode materials.