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