Structural and Thermal Stabilities of LixCoO2 cathode for LIB studied by a temperature programmed reduction (TPR).

In recent years, research and development of battery technology has primarily been focused on the lithium-ion batteries (LIB) due to the high specific energy density, and therefore are widely utilized as the energy source for portable electronics and electric vehicles. However, the battery safety is an essential issue to overcome, as the battery are required higher power density and larger capacity. Many efforts have been conducted to improve the safety of LIB in the active material processing, as well as the cell battery manufacturing and management technology

High performance freestanding composite cathode for lithium-sulfur batteries

A freestanding sulfur/dehydrogenated polyacrylonitrile/multiwalled carbon nanotube composite (S/DPAN/MWCNT) was prepared by a simple vacuum filtration of a mixture of S/DPAN composite and MWCNT suspensions, and studied as a cathode for high performance lithium-sulfur batteries

A free-standing sulfur/nitrogen-doped carbon nanotube electrode for high- performance lithium/sulfur batteries

A free-standing sulfur/nitrogen-doped carbon nanotube (S/N-CNT) composite prepared via a simple solution method was first studied as a cathode material for lithium/sulfur batteries. By taking advantage of the self-weaving behavior of N-CNT, binders and current collectors are rendered unnecessary in the cathode, thereby simplifying its manufacturing and increasing the sulfur weight ratio in the electrode. Transmission electronic microscopy showed the formation of a highly developed core-shell tubular structure consisting of S/N-CNT composite with uniform sulfur coating on the surface of N-CNT. As a core in the composite, the N-CNT with N functionalization provides a highly conductive and mechanically flexible framework, enhancing the electronic conductivity and consequently the rate capability of the material

Three-dimensional Zn/LiFePO4 aqueous hybrid-ion battery for renewable energy integration into electrical grids.

Renewable energy integration into electrical grids is crucial for energy security, leading to the highly secured communication network, traffic control, industrial activities, etc. Renewable energies are intermittent and cannot be easily directly integrated to electric grids without using batteries. These batteries must be safe and inexpensive from the viewpoint of life-cycle cost. Aqueous batteries are non-flammable that can be a great merit compared with traditional lithium-ion batteries that use flammable organic electrolyte solutions

Structural and Thermal Stabilities of LixCoO2 cathode for LIB studied by a temperature programmed reduction (TPR).

In recent years, research and development of battery technology has primarily been focused on the lithium-ion batteries (LIB) due to the high specific energy density, and therefore are widely utilized as the energy source for portable electronics and electric vehicles. However, the battery safety is an essential issue to overcome, as the battery are required higher power density and larger capacity. Many efforts have been conducted to improve the safety of LIB in the active material processing, as well as the cell battery manufacturing and management technology

EFFECT OF ACID ETCHING OF STAINLESS-STEEL FOILS IN RECHARGEABLE LITHIUM-ION BATTERIES

Research into rechargeable aqueous batteries is driven by the need for low-cost, high-safety batteries for large-scale energy storage applications. The effect of current collectors on battery performance is frequently disregarded, despite the fact that the majority of research efforts concentrate on creating electrolyte formulations and electrode materials

Three-dimensional Zn/LiFePO4 aqueous hybrid-ion battery for renewable energy integration into electrical grids.

Renewable energy integration into electrical grids is crucial for energy security, leading to the highly secured communication network, traffic control, industrial activities, etc. Renewable energies are intermittent and cannot be easily directly integrated to electric grids without using batteries. These batteries must be safe and inexpensive from the viewpoint of life-cycle cost. Aqueous batteries are non-flammable that can be a great merit compared with traditional lithium-ion batteries that use flammable organic electrolyte solutions

Novel and Pragmatic Approach to Design Silicon Alloy Anode by Equilibrium Method

Silicon is honored as one of the most promising anode materials for Lithium-ion Batteries (LIBs) because of its high theoretical specific capacity (4200 mAh/g) compared to commercially available graphite anodes (370 mAh/g). Over 20 years, Si has been intensively investigated due to considerable volume expansion of up to 300% upon electrochemical lithiation, leading to electrode cracking and rapid capacity fading. Numerous strategies have been reported with excellent cycle performances in lab-scale [1]. However, up today, many material manufacturers and start-up companies failed to scale-up those technologies for mass-production, in particular, due to the lack of reproducibility, economical feasibility, etc. Herein, we demonstrate a novel and pragmatic approach for the mass-producible synthesis of Si-alloys with homogeneous microstructure and improved electrochemical performances. Namely, we have designed and optimized amorphous phase Si-alloy composition using reliable and mass-producible melt-spinning process (Fig.1). Further, amorphous alloy is subjected to the thermal annealing process to size-controllable re-crystallization and homogeneous growth of nano-Si grains in inactive matrix. As a result of breakthrough strategy the Si-alloy electrode delivered a high specific capacity of 900 mAh/g for 100 cycles at 0.1 A/g with nearly 99% capacity retention [2]

ONION-STRUCTURED SI ANODE CONSTRUCTED WITH COATING BY LI4TI5O12 AND CYCLIZED-POLYACRYLONITRILE FOR LITHIUM-ION BATTERIES

Low dimensional Si-based materials are very promising anode candidates for the next-generation lithium-ion batteries. However, to satisfy the ever-increasing demand in more powerful energy storage devices, electrodes based on Si materials should display high-power accompanied with low volume change upon operation. Thus far, there were no reports on the Si-based materials which satisfy the stated requirements. Hence, here, we report on modified onion-structured Si nanoparticles (SiNPs) co-coated with Li4Ti5O12 (LTO) and cyclized polyacrylonitrile (cPAN) to bring the synergistic effect enhancing the conductivity, tolerance to volume change and stable performance. Obtained results suggest that the nanoparticles were conformally coated with both materials simultaneously and the thicknesses of the films were in a range of a few nanometers. Electrochemical tests show that the modified SiNPs deliver a high initial capacity of 2443 mAh g−1 and stable capacity retention over 50 cycles with 95% Coulombic efficienc