127 research outputs found
New borate ester based polymer electrolyte for battery application
Safety is an indispensable feature for a battery
particularly in large scale applications. In this respect, gel
electrolytes are more attractive due to less possibility of
electrolyte leakage and safer if abused. Unfortunately,
most present gel electrolyte systems are mainly based on
polyethers which supposed to be flammable. In addition,
PEO and PPO based systems exhibit a low cation
transference number. Therefore, the seeking of novel
thermally stable and safety polymer electrolytes with
improved electrochemical behaviour is crucial. In the
present contribution, we propose a series of Li-ion
conducting polymer electrolytes based on the
poly(ethyleneglycol) (PEG) borate ester (PE-350B) and
PEG-methacrylates (PME-400 and PDE-600,
respectively) plasticized by M550B100 PEG-borate ester,
which can be characterized as a thermally stable solvent
with high flash point [1]
Boron-substituted manganese spinel oxide cathode for lithium ion battery
An attempt has been made to synthesize boron-substituted cubic spinel through solid state ŽSS. and solution route ŽSR. techniques. The synthesized spinels have been examined for their physical and electrochemical characteristics through exsitu-X-ray diffractometry ŽXRD. and SEM, as well as by charge–discharge cycling and diffusion coefficient measurements. X-ray diffraction reveals boron elimination from boron-substituted spinel ŽSR-B spinel. resulting in phase splitting to lithium borate glass formation and parent cubic spinel when subjected to heating at and above 6008C. Synthesis through SR with precursor material calcined at 5008C only provides high discharge capacity with good cyclability. The measurement of diffusion coefficient of lithium supports that boron got substituted at 16d site in Fd3m spinel structure. This paper discusses
the mechanism underlying the stability of boron-substituted spinel and the suitability of LiB1r9Mn17r9O4 as a promising
positive electrode candidate for lithium ion battery
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