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Title: Structure dependent electrochemical performance of Li-rich layered oxides in lithium-ion batteries

Authors:
; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1397431
Grant/Contract Number:
AC0206CH11357
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Nano Energy
Additional Journal Information:
Journal Volume: 35; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-04 21:18:34; Journal ID: ISSN 2211-2855
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Fu, Fang, Yao, Yuze, Wang, Haiyan, Xu, Gui-Liang, Amine, Khalil, Sun, Shi-Gang, and Shao, Minhua. Structure dependent electrochemical performance of Li-rich layered oxides in lithium-ion batteries. Netherlands: N. p., 2017. Web. doi:10.1016/j.nanoen.2017.04.005.
Fu, Fang, Yao, Yuze, Wang, Haiyan, Xu, Gui-Liang, Amine, Khalil, Sun, Shi-Gang, & Shao, Minhua. Structure dependent electrochemical performance of Li-rich layered oxides in lithium-ion batteries. Netherlands. doi:10.1016/j.nanoen.2017.04.005.
Fu, Fang, Yao, Yuze, Wang, Haiyan, Xu, Gui-Liang, Amine, Khalil, Sun, Shi-Gang, and Shao, Minhua. 2017. "Structure dependent electrochemical performance of Li-rich layered oxides in lithium-ion batteries". Netherlands. doi:10.1016/j.nanoen.2017.04.005.
@article{osti_1397431,
title = {Structure dependent electrochemical performance of Li-rich layered oxides in lithium-ion batteries},
author = {Fu, Fang and Yao, Yuze and Wang, Haiyan and Xu, Gui-Liang and Amine, Khalil and Sun, Shi-Gang and Shao, Minhua},
abstractNote = {},
doi = {10.1016/j.nanoen.2017.04.005},
journal = {Nano Energy},
number = C,
volume = 35,
place = {Netherlands},
year = 2017,
month = 5
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on April 11, 2018
Publisher's Accepted Manuscript

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  • Rational and precise control of the structure and dimension of electrode materials is an efficient way to improve their electrochemical performance. In this work, solvothermal or co-precipitation method is used to synthesize lithium-rich layered oxide materials of Li1.2Mn0.56Co0.12Ni0.12O2 (LLO) with various morphologies and structures, including microspheres, microrods, nanoplates, and irregular nanoparticles. These materials exhibit strong structure- dependent electrochemical properties. The porous hierarchical structured LLO microrods exhibit the best performance, delivering a discharge capacity of 264.6 mAh g(-1) at 0.5 C with over 91% retention after 100 cycles. At a high rate of 5 C, a high discharge capacity of 173.6more » mAh g(-1) can be achieved. This work reveals the relationship between the morphologies and electrochemical properties of LLO cathode materials, and provides a feasible approach to fabricating robust and high-performance electrode materials for lithium-ion batteries.« less
  • A facile synthesis method was developed to prepare xLi 2MnO 3·(1-x)LiNi 0.7Co 0.15Mn 0.15O 2 (x = 0, 0.03, 0.07, 0.10, 0.20, and 0.30 as molar ratio) cathode materials, combining the advantages of high specific capacity from Ni-rich layered phase and surface chemical stability from Li-rich layered phase. X-ray diffraction (XRD), high resolution transmission electron microscope (HRTEM) and electrochemical charge/discharge performance confirm the formation of a Li-rich layered phase with C2/m symmetry. Most importantly, high-angle annular dark-field (HAADF) scanning transmission electron microscopy (STEM) reveals a spatial relationship that Li-rich nano-domain islands are integrated into a conventional Ni-rich layered matrix (Rmore » $$\bar{3}$$m). This is the first time that Li-rich phase has been directly observed inside a particle at the nano-scale, when the overall composition of layered compounds (Li 1+δNi xMn yM 1-x-y-δO 2, M refers to transition metal elements) is Ni-rich (x > 0.5) rather than Mn-rich (y > 0.5). Remarkably, xLi 2MnO 3·(1-x)LiNi 0.7Co 0.15Mn 0.15O 2 cathode with optimized x value shows superior electrochemical performance at C/3, i.e., 170 mA h g -1 with 90.3 % of capacity retention after 400 cycles at 25 °C and 164 mA h g -1 with 81.3 % capacity retention after 200 cycles at 55 °C.« less
  • The Ni-rich layered oxides with a Ni content of >0.5 are drawing much attention recently to increase the energy density of lithium-ion batteries. However, the Ni-rich layered oxides suffer from aggressive reaction of the cathode surface with the organic electrolyte at the higher operating voltages, resulting in consequent impedance rise and capacity fade. To overcome this difficulty, we present here a heterostructure composed of a Ni-rich LiNi 0.7Co 0.15Mn 0.15O 2 core and a Li-rich Li 1.2-xNi 0.2Mn 0.6O 2 shell, incorporating the advantageous features of the structural stability of the core and chemical stability of the shell. With amore » unique chemical treatment for the activation of the Li 2MnO 3 phase of the shell, a high capacity is realized with the Li-rich shell material. Aberration-corrected scanning transmission electron microscopy (STEM) provides direct evidence for the formation of surface Li-rich shell layer. Finally, the heterostructure exhibits a high capacity retention of 98% and a discharge- voltage retention of 97% during 100 cycles with a discharge capacity of 190 mA h g -1 (at 2.0–4.5 V under C/3 rate, 1C = 200 mA g -1).« less