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Title: A facile cathode design combining Ni-rich layered oxides with Li-rich layered oxides for lithium-ion batteries

Abstract

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 (R$$\bar{3}$$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.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1340858
Report Number(s):
PNNL-SA-115253
Journal ID: ISSN 0378-7753; 48379; KP1704020
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Power Sources; Journal Volume: 325; Journal Issue: C
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; Environmental Molecular Sciences Laboratory

Citation Formats

Song, Bohang, Li, Wangda, Yan, Pengfei, Oh, Seung-Min, Wang, Chong-Min, and Manthiram, Arumugam. A facile cathode design combining Ni-rich layered oxides with Li-rich layered oxides for lithium-ion batteries. United States: N. p., 2016. Web. doi:10.1016/j.jpowsour.2016.06.056.
Song, Bohang, Li, Wangda, Yan, Pengfei, Oh, Seung-Min, Wang, Chong-Min, & Manthiram, Arumugam. A facile cathode design combining Ni-rich layered oxides with Li-rich layered oxides for lithium-ion batteries. United States. doi:10.1016/j.jpowsour.2016.06.056.
Song, Bohang, Li, Wangda, Yan, Pengfei, Oh, Seung-Min, Wang, Chong-Min, and Manthiram, Arumugam. Thu . "A facile cathode design combining Ni-rich layered oxides with Li-rich layered oxides for lithium-ion batteries". United States. doi:10.1016/j.jpowsour.2016.06.056.
@article{osti_1340858,
title = {A facile cathode design combining Ni-rich layered oxides with Li-rich layered oxides for lithium-ion batteries},
author = {Song, Bohang and Li, Wangda and Yan, Pengfei and Oh, Seung-Min and Wang, Chong-Min and Manthiram, Arumugam},
abstractNote = {A facile synthesis method was developed to prepare xLi2MnO3·(1-x)LiNi0.7Co0.15Mn0.15O2 (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 (R$\bar{3}$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 (Li1+δNixMnyM1-x-y-δO2, M refers to transition metal elements) is Ni-rich (x > 0.5) rather than Mn-rich (y > 0.5). Remarkably, xLi2MnO3·(1-x)LiNi0.7Co0.15Mn0.15O2 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.},
doi = {10.1016/j.jpowsour.2016.06.056},
journal = {Journal of Power Sources},
number = C,
volume = 325,
place = {United States},
year = {Thu Sep 01 00:00:00 EDT 2016},
month = {Thu Sep 01 00:00:00 EDT 2016}
}