Multistage Li1.2Ni0.2Mn0.6O2 Micro‐architecture towards High‐Performance Cathode Materials for Lithium‐Ion Batteries. Issue 12 (19th September 2017)

• Record Type: Journal Article
• Authors: He, Wei; Zheng, Hongfei; Ju, Xiaokang; Li, Shengyang; Ma, Yating; Xie, Qingshui; Wang, Laisen; Qu, Baihua; Peng, Dong‐Liang
• Is Part Of: ChemElectroChem. Volume 4:Issue 12(2017)
• Page Start: 3250
• Page End: 3256
• Publication Date: 2017-09-19
• Subjects: Li1.2Ni0.2Mn0.6O2 -- hierarchical microspheres -- lithium-ion batteries -- cathode materials; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.201700727
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: Constructing hierarchical‐architecture primary nanoparticles that assemble with secondary micro‐architectures is very effective to achieve high‐performance cathode materials for lithium‐ion batteries (LIBs). In this work, well‐crystallized lithium‐rich layered oxide cathode materials Li1.2 Ni0.2 Mn0.6 O2 (LNMO) with a micro‐architecture was successfully synthesized. The preparation process is divided into two steps: the solvothermal process synthesizes the precursor Ni0.25 Mn0.75 CO3 (NMCO) and gradient temperature calcination is used to prepare the primary nanoparticles that agglomerate into hierarchical microspheres for final‐product LNMO. The as‐prepared material was used as cathode materials for LIBs, which exhibit good cycle life and excellent rate performances. The material retains a fairly high discharge capacity of approximately 180 mAh g −1 after 180 cycles at the 2C rate (1C=200 mA g −1 ). Even after a 50‐fold (5C/0.1C) increase, a discharge capacity 61.4 % (153.8 mAh g −1 ) of the capacity at 0.1C (ca. 249.1 mAh g −1 ) could be retained. This superior cycle life and rate performance are attributed to the merits of the hierarchical nano‐/microsphere structures. Abstract : Levels of complexity : The Li1.2 Ni0.2 Mn0.6 O2 micro‐/nano‐architecture retains a fairly high discharge capacity of approximately 180 mAh g −1 after 180 cycles at the 2C rate (1C=200 mA g −1 ). Even after a 50‐fold (5C/0.1C) increase, a discharge capacity 61.4 % (153.8 mAh g −1 ) of the capacity at 0.1C (ca. 249.1 mAh g −1 ) can still be retained, showing excellent rate performances and stability.