PEDOT: PSS as a Functional Binder for Cathodes in Lithium Ion Batteries
PEDOT: PSS as a Functional Binder for Cathodes in Lithium Ion Batteries
复制标题
DOI：
10.1149/2.0581504jes
复制
发表时间：
2015-01-01
影响因子：
3.9
通讯作者：
Wittstock, Gunther
中科院分区：
文献类型：
--
作者：
Das, Pratik R.;Komsiyska, Lidiya;Wittstock, Gunther
随着可充电锂离子电池应用领域的不断扩大，其能量密度、倍率能力和循环寿命的提高势在必行。典型的阴极通常含有氧化还原活性过渡金属氧化物作为活性材料、保证电子导电性的导电添加剂和粘结剂支撑基体。本文报道了无炭黑LiFePO4复合电极的行为和性能，其中聚（3,4-乙烯二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT:PSS）完成了粘结剂和导电添加剂的双重作用。采用扫描电镜、汞孔法和高分辨率x射线计算机断层扫描技术研究了聚合物用量对电极形貌特性的影响。将复合电极的电化学性能和循环稳定性与添加了碳和PVDF粘结剂的传统阴极进行了比较。随着PEDOT:PSS含量的增加，过电压降低，相应的速率能力提高。含有8% PEDOT:PSS的复合阴极具有与常规复合阴极相当的电极容量和更好的循环稳定性。(C) 2015中国电化学会。版权所有。
The application areas of rechargeable Li-ion batteries continue to grow, hence improvement in their energy density, rate capability and cycle life is necessary. A typical cathode contains usually redox active transition metal oxides as active materials, conductive additives to ensure electronic conductivity and binder supporting matrix. In this work we report the behavior and properties of carbon black free LiFePO4 composite electrode, where poly (3,4-ethylene dioxythiophene):poly (styrene sulfonate) (PEDOT:PSS) is accomplishing a dual role of binder and conducting additive. The effect of the polymer amount on the morphometric properties of the electrodes was studied using SEM, mercury porosimetry and high resolution X-ray computed tomography. The electrochemical performance and the cycling stability of the composite electrodes were compared to the behavior of conventional cathodes with carbon additives and PVDF binder. With increasing PEDOT:PSS content a decrease in the overvoltage and correspondingly an improvement in the rate capability is observed. Composite cathodes containing 8% PEDOT:PSS show comparable electrode capacity and better cyclic stability than conventional composite cathode. (C) 2015 The Electrochemical Society. All rights reserved.