Effects of polymeric binders on electrochemical performances of spinel lithium manganese oxide cathodes in lithium ion batteries
Effects of polymeric binders on electrochemical performances of spinel lithium manganese oxide cathodes in lithium ion batteries
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DOI：
10.1016/j.jpowsour.2014.06.167
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发表时间：
2014-12-10
影响因子：
9.2
通讯作者：
Oh, Eun-Suok
中科院分区：
文献类型：
--
作者：
Lee, Sangmin;Kim, Eun-Young;Oh, Eun-Suok
研究了聚合物粘结剂对尖晶石型LiMn2O4(LMO)电极中锰的溶解和电化学性能的影响。选择了聚乙烯醇(PVA)、聚丙烯酸(PM)和聚丙烯腈(PAN)三种有希望的聚合物作为LMO电极的粘合剂，并与目前流行的聚偏氟乙烯(PVDF)进行了比较。对于用所选粘结剂制造的LMO电极，检测了包括表面覆盖率、结合强度和电解液吸收在内的物理化学性质。此外，还研究了锰的溶解行为、倍率能力、循环性能和热稳定性等电化学性能因素。与其他三种粘结剂相比，PAN具有优异的倍率性能、优异的循环性能和较高的热稳定性，是一种性能优异的LMO电极粘结剂。这可以归因于适量的电解液吸收和PAN的低阻抗，尽管LMO的表面覆盖率相对较大，从而导致较低的锰溶解。(C)2014爱思唯尔B.V.保留所有权利。
Effects of polymeric binders on both the dissolution of manganese (Mn) and electrochemical properties of spinel LiMn2O4 (LMO) electrodes are investigated in detail. Three promising polymers, polyvinyl alcohol (PVA), polyacrylic acid (PM), and polyacrylonitrile (PAN) are chosen as binders for the LMO electrodes and compared to currently popular polyvinylidene fluoride (PVdF). For LMO electrodes fabricated with the selected binders, physicochemical properties including surface coverage, adhesion strength, and electrolyte uptake are examined. Also, electrochemical performance factors such as Mn dissolution behavior, rate capability, cycle performance, and thermal stability are investigated. PAN is revealed to be an outstanding binder for LMO electrodes based on its excellent rate capability, superior cycle performance, and high thermal stability when compared to the other three binders. This can be ascribed to an appropriate amount of electrolyte uptake and low impedance of the PAN despite the relatively large surface coverage of the LMO that leads to lower Mn dissolution. (C) 2014 Elsevier B.V. All rights reserved.