Integrated Surface Functionalization of Li-Rich Cathode Materials for Li-Ion Batteries

Dandan Wang; Tinghua Xu; Yaping Li; Du Pan; Xia Lu; Yong Sheng Hu; Sheng Dai; Ying Bai

doi:10.1021/acsami.8b16319

Integrated Surface Functionalization of Li-Rich Cathode Materials for Li-Ion Batteries

Dandan Wang
, Tinghua Xu
, Yaping Li
, Du Pan
, Xia Lu
, Yong Sheng Hu
, Sheng Dai
, Ying Bai

Nanomaterials Chemistry Group

Research output: Contribution to journal › Article › peer-review

66 Scopus citations

Abstract

As candidates for high-energy density cathodes, lithium-rich (Li-rich) layered materials have attracted wide interest for next-generation Li-ion batteries. In this work, surface functionalization of a typical Li-rich material Li _1.2 Mn _0.56 Ni _0.17 Co _0.07 O ₂ is optimized by fluorine (F)-doped Li ₂ SnO ₃ coating layer and electrochemical performances are also enhanced accordingly. The results demonstrate that F-doped Li ₂ SnO ₃ -modified material exhibits the highest capacity retention (73% after 200 cycles), with approximately 1.2, 1.4, and 1.5 times of discharge capacity for Li ₂ SnO ₃ surface-modified, F-doped, and pristine electrodes, respectively. To reveal the fundamental enhancement mechanism, intensive surface Li ⁺ diffusion kinetics, postmortem structural characteristics, and aging tests are performed for four sample systems. The results show that the integrated coating layer plays an important role in addressing interface compatibility, not only limited in stabilizing the bulk structure and suppressing side reactions, synergistically contributing to the performance enhancement for the active electrodes. These findings not only pave the way to commercial application of the Li-rich material but also shed new light on surface modification in batteries and other energy storage fields.

Original language	English
Pages (from-to)	41802-41813
Number of pages	12
Journal	ACS Applied Materials and Interfaces
Volume	10
Issue number	48
DOIs	https://doi.org/10.1021/acsami.8b16319
State	Published - Dec 5 2018

Funding

This work was supported by the National Natural Science Foundation of China (50902044, 51672069, and 10674041), the 863 Program of China (2015AA034201), the Program for Science and Technology Innovation Talents in Universities of Henan Province (16HASTIT042), and the International Cooperation Project of Science and Technology Department of Henan Province (162102410014). SD was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences, and Engineering Division. This work was supported by the National Natural Science Foundation of China (50902044, 51672069, and 10674041), the 863 Program of China (2015AA034201), the Program for Science and Technology Innovation Talents in Universities of Henan Province (16HASTIT042), and the International Cooperation Project of Science and Technology Department of Henan Province (162102410014). SD was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division.

Keywords

F-doped Li SnO coating layer
Li-rich layered material
electrochemical performance
integrated design
mechanism investigation

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10.1021/acsami.8b16319

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title = "Integrated Surface Functionalization of Li-Rich Cathode Materials for Li-Ion Batteries",

abstract = " As candidates for high-energy density cathodes, lithium-rich (Li-rich) layered materials have attracted wide interest for next-generation Li-ion batteries. In this work, surface functionalization of a typical Li-rich material Li 1.2 Mn 0.56 Ni 0.17 Co 0.07 O 2 is optimized by fluorine (F)-doped Li 2 SnO 3 coating layer and electrochemical performances are also enhanced accordingly. The results demonstrate that F-doped Li 2 SnO 3 -modified material exhibits the highest capacity retention (73\% after 200 cycles), with approximately 1.2, 1.4, and 1.5 times of discharge capacity for Li 2 SnO 3 surface-modified, F-doped, and pristine electrodes, respectively. To reveal the fundamental enhancement mechanism, intensive surface Li + diffusion kinetics, postmortem structural characteristics, and aging tests are performed for four sample systems. The results show that the integrated coating layer plays an important role in addressing interface compatibility, not only limited in stabilizing the bulk structure and suppressing side reactions, synergistically contributing to the performance enhancement for the active electrodes. These findings not only pave the way to commercial application of the Li-rich material but also shed new light on surface modification in batteries and other energy storage fields.",

keywords = "F-doped Li SnO coating layer, Li-rich layered material, electrochemical performance, integrated design, mechanism investigation",

author = "Dandan Wang and Tinghua Xu and Yaping Li and Du Pan and Xia Lu and Hu, \{Yong Sheng\} and Sheng Dai and Ying Bai",

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AU - Wang, Dandan

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AU - Hu, Yong Sheng

AU - Dai, Sheng

AU - Bai, Ying

PY - 2018/12/5

Y1 - 2018/12/5

N2 - As candidates for high-energy density cathodes, lithium-rich (Li-rich) layered materials have attracted wide interest for next-generation Li-ion batteries. In this work, surface functionalization of a typical Li-rich material Li 1.2 Mn 0.56 Ni 0.17 Co 0.07 O 2 is optimized by fluorine (F)-doped Li 2 SnO 3 coating layer and electrochemical performances are also enhanced accordingly. The results demonstrate that F-doped Li 2 SnO 3 -modified material exhibits the highest capacity retention (73% after 200 cycles), with approximately 1.2, 1.4, and 1.5 times of discharge capacity for Li 2 SnO 3 surface-modified, F-doped, and pristine electrodes, respectively. To reveal the fundamental enhancement mechanism, intensive surface Li + diffusion kinetics, postmortem structural characteristics, and aging tests are performed for four sample systems. The results show that the integrated coating layer plays an important role in addressing interface compatibility, not only limited in stabilizing the bulk structure and suppressing side reactions, synergistically contributing to the performance enhancement for the active electrodes. These findings not only pave the way to commercial application of the Li-rich material but also shed new light on surface modification in batteries and other energy storage fields.

AB - As candidates for high-energy density cathodes, lithium-rich (Li-rich) layered materials have attracted wide interest for next-generation Li-ion batteries. In this work, surface functionalization of a typical Li-rich material Li 1.2 Mn 0.56 Ni 0.17 Co 0.07 O 2 is optimized by fluorine (F)-doped Li 2 SnO 3 coating layer and electrochemical performances are also enhanced accordingly. The results demonstrate that F-doped Li 2 SnO 3 -modified material exhibits the highest capacity retention (73% after 200 cycles), with approximately 1.2, 1.4, and 1.5 times of discharge capacity for Li 2 SnO 3 surface-modified, F-doped, and pristine electrodes, respectively. To reveal the fundamental enhancement mechanism, intensive surface Li + diffusion kinetics, postmortem structural characteristics, and aging tests are performed for four sample systems. The results show that the integrated coating layer plays an important role in addressing interface compatibility, not only limited in stabilizing the bulk structure and suppressing side reactions, synergistically contributing to the performance enhancement for the active electrodes. These findings not only pave the way to commercial application of the Li-rich material but also shed new light on surface modification in batteries and other energy storage fields.

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Integrated Surface Functionalization of Li-Rich Cathode Materials for Li-Ion Batteries

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