电化学
聚苯胺
电解质
电极
阴极
插层(化学)
材料科学
混合材料
无机化学
聚合
化学工程
纳米技术
化学
复合材料
聚合物
工程类
物理化学
作者
K. Karthikeyan,Zhengyu Bai,Zhongwei Chen
标识
DOI:10.1021/acs.jpcc.9b01477
摘要
An ecofriendly cobalt-free O3-Na[Ni1/3Mn1/3Fe1/3]O2 (NNMF) embedded on conductive polyaniline (PANI) backbones is synthesized as a hybrid cathode by a facile chemical polymerization technique. As a cathode for rechargeable sodium ion batteries (RSIB), the NNMF with the 0.3 M PANI (NNMF-PANI3) hybrid electrode displays an enhanced energy density of 567 Wh kg–1 at a high operating voltage of 2–4.5 V along with excellent cyclic performance. In addition, the NNMF-PANI3 hybrid electrode exhibits ∼75% capacity retention after 750 cycles at 2 A g–1 current density within 2–4.5 V. Conversely, the pristine NNMF electrode without PANI fails to demonstrate adequate electrochemical performance even in a low cut-off voltage range (2–4.2 V). The superior electrochemical performance of the hybrid electrode is attributed to effective Na-ion transportation within the hybrid structure in which PANI keeps the NNMF particles interconnected uniformly and offers better conductive contact between the electrolyte and the active species. Moreover, the presence of a porous PANI networks allow more electrolyte penetration within its structure and eliminates the inherent mechanical stress during the electrochemical Na-ion intercalation/deintercalation at high currents. The results obtained in the present investigation reveal that organic–inorganic hybrids could be realized as promising ecofriendly high-performance cathode materials for RSIB applications.
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