Materials Literature
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Although lithium ion batteries (LIBs) have been used in many consumer and industrial products, the energy storage capacity per volume/weight and the battery cycling lifetime have much room for further improvement. This is especially challenging for high demanding applications such as long-range electric vehicles, and…
Lithium-ion capacitor (LICs), a novel electrochemical energy storage class combined the advantages of lithium-ion batteries and supercapacitor, are attractive for high energy densities, high power densities, and long cycle life. A typical LIC is made up of a Li-ion battery (LIB) anode, an electrochemical double-layer…
The lithium garnet has been considered as one of promising solid electrolytes for all solid state rechargeable lithium batteries. Under such circumstance, the Li7La3Zr2O12 (LLZO)-based powders and ceramics have been extensively studied in our lab. By elemental doping, liquid-phase sintering, atmosphere sintering, hot-…
High capacity and high voltage cathodic materials are key to increase the power and energy densities of rechargeable batteries. The cause of instability of the high voltage cathodic materials is that these cathodic materials irreversibly react with the electrolyte solutions during charging/discharging and/or storage p…
Spinel LiMn2O4 (LMO) is an inexpensive, non-toxic cathode material for lithium ion batteries. Its high reduction potential (~4.1 V vs. Li/Li+) and excellent rate capability have made LMO competitive with the industry standard cathode material, LiCoO2. Despite its advantages, however, reaction with HF in the electrolyt…
Lithium ion batteries have been increasingly urged with high energy density and long cycle life to meet the increasing requirements for portable electronics, use of renewable energy and electric vehicles. The availability of the appropriate cathode material is crucial for the development of lithium ion batteries with…
The Li-ion chemistry is thus far the most advanced chemistry employed in battery technology. To date, Li-ion batteries dominate the market of the electronics and portables devices. However, in the field of electric and hybrid vehicles further improvements are required in terms of performance, safety, and cost. The sam…
Growing demand of Li-ion batteries initiates the on-going researches on new electrode materials with improved performance. Conversion-type anode materials have been a topic of interest ever since the beginning of the 21st century due to their intrinsically high capacity, which can enhance significantly the energy dens…
Non-destructive studies to investigate Li-ion batteries in situ/operando are a challenge although they show much more details on the processes during charging/discharging and aging. Especially, the high sensitivity of neutrons to light elements as Li and easier distinction of neighbor elements in comparison to X-rays…
With the possible exhaust of fossil oil, effective utility of energy becomes an important issue, clean energy and rechargeable energy are thus highly developed. In which, rechargeable lithium-ion batteries attract much attention because of its extensive use such as portable electronic devices, powering hybrid electric…
Recently Li-ion battery has been used extensively as a portable power source for small electronic devices, a power source for electric vehicles and an attractive option for energy storage. Artificial graphite, natural graphite, hard carbon, such as carbon-based materials as anode active material have been applied, Acc…
Safety is very crucial for lithium-ion batteries (LIBs) in the application of electric vehicles (EVs), hybrid EVs (HEVs), and plug-in HEVs (PHEVs). Li4Ti5O12 (LTO) is non-flammable, and has a safe working potential of approximately 1.55 V (vs Li+/Li), which prevents the formation of the solid electrolyte interphase (S…
In this poster, we report the development of a quasi in-situ TEM technique to study structural changes of electrode materials for Li-ion and Na-ion batteries. Some preliminary results about structural (ir)reversibility of NiO conversion anode materials relating to the materials’ size and morphology will be discussed a…
Certain glyme-Li salt complexes behave like room temperature ionic liquids (RTILs). Li+ ion forms complex cation with glyme, Gn (CH3O(CH2CH2O) n CH3), in 1:1 ratio when the chain length of glyme n = 3 or 4. In the equimolar complex of a glyme and a Li salt, nearly all glymes coordinate to Li+ cations and therefore the…
Layer-structured materials have been widely used in various applications due to their distinctive structures and physical/ chemical properties. As the electrode materials for sodium (Na)-ion batteries (NIB), their intercalation mechanisms remain unclear and their electrochemical performances are unsatisfied with low s…
Performing in situ and operando measurements on electrode materials for Li-ion and Na-ion batteries is of importance for their understanding and improvement. Electrode materials need to be studied in their environment (in situ) and in real time while they function (operando), since they normally operate in non-equilib…
Conductive nanocarbons generally are used as the electronic conductive additives to contact with active materials to generate conductive network for electrodes of commercial Li-ion batteries (LIBs). In this work, conductive nanocarbons are systematically studied and classified as “hard” and “soft” conductive-carbons (…
Lithium containing metal phosphate LiFePO4, LiMnPO4, Li3V2(PO4)3 etc. were explored as a thermally stable electrode materials results from bonding of oxygen to phosphorous stabilizes the structure from oxygen evolution contradict to layered transition metal oxides at high charge voltages. Li2FeP2O7 and Li2MnP2O7 were…
The adhesion of anode and electrode materials to such substrates as current collectors and solid electrolytes is an important area of research. Many potential anode and cathode materials such as SnO2 and sulfur expand as much as 300% with the intercalation of lithium. Thus understanding adhesion mechanisms can result…
Mixed transition metal oxides are among the most promising cathode materials for lithium ion batteries. The high specific capacity, low cost and thermal stability makes Li(Ni1/3Mn1/3Co1/3)O2, so-called NMC, an excellent material for power tool applications. Therefore, main leading battery manufacturer focus on the com…