Time filter

Source Type

Patent
Institute Of Batteries Llc | Date: 2015-11-13

A rechargeable battery includes a stack made up of an anode, a separator wetted in an organic electrolyte, and a cathode. The stack is free of metal lithium. In these conditions, the anode is pre-lithiated and comprises silicon, and the cathode includes sulfur. A method of assembling this rechargeable battery is also provided.


Patent
Institute of Batteries LLC | Date: 2017-02-08

The invention relates to a rechargeable battery comprising a stack consisting of an anode (1), a separator (2) wetted in an organic electrolyte, and a cathode (3). According to the invention, the stack is free of metal lithium. In these conditions, the anode (1) is pre-lithiated and comprises a silicon, and the cathode (3) comprises a sulfur. The invention also relates to a method of assembling of this rechargeable battery.


Zhang Y.,Nazarbayev University | Zhang Y.,Institute of Batteries LLC | Zhao Y.,Nazarbayev University | Zhao Y.,Institute of Batteries LLC | And 2 more authors.
Ionics | Year: 2014

We report on a simple and facile synthesis route for the sulfur/graphene oxide composite via ultrasonic mixing of the nano-sulfur and graphene oxide aqueous suspensions followed by a low-temperature heat treatment. High-resolution transmission and scanning electronic microscopy observations revealed the formation of a highly porous structure consisting of sulfur with uniform graphene oxide coating on its surface. The resulting sulfur/graphene oxide (S/GO) composite exhibited high and stable specific discharge capacities of 591 mAh g-1 after 100 cycles at 0.1 C and good rate capability. This enhanced electrochemical performance could be attributed to the effective confining the polysulfides dissolution and accommodation of the volume changes during the Li-S electrochemical reaction by the functional groups on the graphene oxide coating layer. Furthermore, the highly developed porous structure of S/GO composite favors the enhanced ion transport and electrolyte diffusion. © 2014 Springer-Verlag Berlin Heidelberg.


Zhao Y.,Hebei University of Technology | Bakenova Z.,Institute of Batteries LLC | Zhang Y.,Hebei University of Technology | Peng H.,Hebei University of Technology | And 3 more authors.
Ionics | Year: 2015

A sulfur/nitrogen-doped graphene (S/N-G) composite was synthesized by simple sonicated mixing of nanosized sulfur suspension and nitrogen-doped graphene suspension followed by heat treatment. Scanning electron microscopy and energy dispersive spectroscopy mapping showed the formation of a porous structure with uniform distribution of sulfur and nitrogen-doped graphene. Electrochemical performance reveals that the resultant S/N-G composite exhibits a high reversible capacity of 1355 mAh g−1 at the initial cycle, with 823 mAh g−1 remaining after 80 cycles at 0.1 C. Moreover, a reversible capacity of 475 mAh g−1 could still be obtained at 2.5 C. Such an electrochemical performance of S/N-G composite is superior to the graphene counterpart. The enhanced electrochemical performance can be attributed to the introduction of nitrogen-doped graphene with the N functionalization, which provides both a more effective electron conduction path and a stronger physical and chemical confinement setting for elemental sulfur and resident polysulfides. © 2015, Springer-Verlag Berlin Heidelberg.


Mentbayeva A.,Institute of Batteries LLC | Mentbayeva A.,Nazarbayev University | Belgibayeva A.,Institute of Batteries LLC | Umirov N.,Institute of Batteries LLC | And 7 more authors.
Electrochimica Acta | Year: 2016

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. SEM and EDS analysis revealed uniform distribution of sulfur in a conductive pyrolyzed polyacrylonitrile host matrix with MWCNT integrated into the composite. Self-weaving MWCNT create an electronically conductive network and reinforce structural stability of the system, leading to an outstanding electrochemical performance of the composite cathode. Binder/current collector-free composite cathode exhibits high capacities of 1450 mAh g−1 at 0.2 C and 930 mAh g−1 at 2 C charge-discharge rates. A high discharge capacity of 1250 mAh g−1 is achieved after 260 cycles at 0.2 C with a coulombic efficiency around 100%. © 2016 Elsevier Ltd


Yermukhambetova A.,Nazarbayev University | Bakenov Z.,Nazarbayev University | Bakenov Z.,Institute of Batteries LLC | Zhang Y.,Institute of Batteries LLC | And 4 more authors.
Journal of Electroanalytical Chemistry | Year: 2015

Nanostructured magnesium nickel oxide Mg0.6Ni0.4O and alumina Al2O3 were studied as additives to sulphur/polyaniline (S/PANI) composites via wet ball-milling of sulphur and polyaniline followed by heat treatment. Metal oxide nanoparticles, which have small particle size, porous structure and high specific surface area to volume ratio, are expected to be catalytic for chemical reactions, including electron transfer and are able to adsorb lithium polysulphides. The composites were characterized by SEM and electrochemical methods. Cyclic voltammetry studies suggest that the alumina additive acts differently to the Mg0.6Ni0.4O. The results suggest that although the alumina additive improves the S/PANI composite performance as a lithium-sulphur battery cathode, the use of Mg0.6Ni0.4O is more effective. © 2015.


Zhao Y.,Hebei University of Technology | Yin F.,Hebei University of Technology | Zhang Y.,Hebei University of Technology | Zhang C.,Hebei University of Technology | And 7 more authors.
Nanoscale Research Letters | Year: 2015

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. © 2015, Zhao et al.


PubMed | Hebei University of Technology and Institute of Batteries LLC
Type: Journal Article | Journal: Nanoscale research letters | Year: 2015

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.


Patent
Institute of Batteries LLC | Date: 2016-11-02

The invention relates to a flow-assist-free Zn/NiOOH battery comprising a housing, an anode, a cathode, an electrolyte. According to the invention, the flow-assist-free Zn/NiOOH battery comprises: a first carbon-based porous current collector (1) having an electrodeposited thereon anode material, comprising zinc, thereby forming the porous anode, an electropolymerized zinc whisker crystals growth suppressor conformally coated onto the porous anode, a second carbon-based porous current collector (2) having an electrodeposited thereon cathode material, comprising NiOOH, thereby forming the porous cathode, a separator (3) and an aqueous electrolyte solution of KOH and ZnO.


Patent
Institute Of Batteries Llc | Date: 2015-08-25

The invention relates to a flow-assist-free Zn/NiOOH battery comprising a housing, an anode, a cathode, an electrolyte. According to the invention, the flow-assist-free Zn/NiOOH battery comprises:

Loading Institute of Batteries LLC collaborators
Loading Institute of Batteries LLC collaborators