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To address the challenge of the IL-based electrolyte cannot be effectively intercalated in graphite anode, and especially the urgent needs for the compatibility between high performance and high security, the IL-based hybrid electrolyte systems with ethylene carbonate/propylene carbonate (EC/PC) as a co-solvent and vinylene carbonate (VC) as an additive were designed. The high dielectric constant...
The impacts of boron-based Li salt additives including lithium tetrafluoroborate (LiBF4) and lithium difluoro(oxalate)borate (LDFOB) on the storage life of Li-ion battery at elevated temperature are investigated. Adding 1 wt% additives in the electrolyte significantly affects the storage life of the LiNi0.8Co0.15Al0.05O2/graphite full cell at 55 °C. The anode solid electrolyte interphase (SEI), preventing...
A thin-film lithium phosphorous oxynitride (LiPON) layer on the top of a graphite anode is synthesized via radio frequency magnetron sputtering, whereas the thickness of the film is about 0.3 ~ 1.3 μm. The field emission scanning electron microscopy on the samples confirms the even-coated layer on the anode, while the thickness of layer is reconfirmed by weighing the area density of sputtered anode...
The lithium-rich layered oxides offer higher capacity, but suffer from severe capacity fade and voltage decay. Aluminum doping can improve the stability of the structure, but the fundamental mechanism has not been fully revealed. In this work, cathode materials with different Al-doping contents are investigated. To characterize the structural evolutions upon cycling, ex situ XRD and ex situ TEM are...
Trifluoroethyl aliphatic carboxylates with different length of carbon-chain in acyl groups have been introduced into carbonate-based electrolyte as co-solvents to improve the low-temperature performance of lithium-ion batteries, both in capacity retention and lowering polarization of graphite electrode. To identify the further influence of trifluoroethyl aliphatic carboxylates on graphite electrode,...
The oxidation of polysulfides to element sulfur in charge process was studied by solution thermodynamic analysis and means of cyclic voltammetry (CV), X-ray diffraction (XRD), and charge–discharge test. Basing on the solution thermodynamic analysis, the oxidation process of polysulfides to element sulfur would arise only if the charge voltage exceeds 3.36 V in a lithium–sulfur cell employing 1.0 M...
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