Deposition of Cross-Linked Dopamine and Polyethylenimine on Polypropylene Separators via One-Step Soaking Method for Li-S Batteries

Abstract

A facile and simple strategy to modify polypropylene (PP) separators with dopamine (DA) and polyethylenimine (PEI) has been proposed. The cross-linked DA-PEI nanoparticles can be adsorbed to the PP separator by the quinonyl groups of DA efficiently. The electrolyte wettability of the modified separator is obviously improved. The Li-S battery with the modified separator delivers a high cycling capacity and rate capacity. The specific capacity of Li-S battery with A1P3 separator is 1033.4 mA h g−1 and stabilizes at 470.8 mA h g−1 at 0.2 C after 100 cycles. And its rate capacity at 0.2 C, 0.5 C, 1 C, and 2 C is 1016.5 mA h g−1, 754.6 mA h g−1, 676.2 mA h g−1, and 463.6 mA h g−1, respectively. The outstanding electrochemical performance could be ascribed to that the polar deposited layer, which not only alleviates the shuttle effect by physical blocking and electrostatic interactions, but also facilitates Li+ ions migration by the improved electrolyte wettability.

Surface modification of LiNi 0.5 Co 0.2 Mn 0.3 O 2 cathode materials with Li 2 O‐B 2 O 3 ‐LiBr for lithium‐ion batteries

“…Those advantages made LIBs one of the most promising energy storage candidates for power tools, portable devices, and hybrid electric vehicles. [1][2][3][4][5][6][7] LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM523), with its laminar structure, is regarded as a potential cathode material to replace commercial LiCoO 2 (LCO) electrodes. Compared with LCO, NCM523 has lower toxicity, higher capacity, lower cost, and better safety properties.…”

“…Lithium‐ion batteries (LIBs) have large discharge capacity, high energy density, high rate capability, excellent charge‐discharge cycling performance, and low cost. Those advantages made LIBs one of the most promising energy storage candidates for power tools, portable devices, and hybrid electric vehicles . LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM523), with its laminar structure, is regarded as a potential cathode material to replace commercial LiCoO 2 (LCO) electrodes.…”

Thermosensitive Polyacrylonitrile/Polyethylene Oxide/Polyacrylonitrile Membrane Separators for Prompt and Safer Thermal Lithium-Ion Battery Shutdown

“…29 Current studies on thermal shutdown separators have made huge contributions to the thermal safety of lithium-ion batteries. 30,31 However, novel separators with a lower thermal shutdown temperature and a higher buffer temperature are still needed to further improve thermal safety.…”

Algorithm for Assessing the Convergence of a Cyclic Voltammetry to Its Limit Cycle

“…However, in the decades of the 60s and the 70s, significant advances were made in the theory and the instrumentation of voltammetric methods, such as the development of low-cost operational amplifiers that enabled affordable potentiostats. 2 These advances boosted the practical applicability of voltammetric methods, leading to the actual situation where voltammetric methods are widely used in a large variety of fields, such as electrodeposition, 3 batteries, [4][5][6][7] fuel cells, 8,9 supercapacitors, 10,11 electrochemical advanced oxidation, [12][13][14] electrochemical sensors, [15][16][17][18] ionic liquids [19][20][21][22] and surfactants, 23 amongst many others.…”