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Title: Boosting Cell Performance of LiNi0.8Co0.15A0.05O2 via Surface Structure Design

Abstract

Although the high energy density and environmental benignancy of LiNi0.8Co0.15A0.05O2 (NCA) holds promise for use as cathode material in Li-ion batteries, present low rate capabilities, and fast capacity fade limit its broad commercial applications. Here, it is reported that surface modification of NCA cathode (R-3m) with 5 nm-thick nanopillar layers and Fm-3m structures significantly improves electrode structure, morphology, and electrochemical performance. The formation of nanopillar layers increases cycling and working voltage stability of NCA by shielding the host material from hydrofluoric acid and improves structural stability with the electrolyte. The modified NCA cathode exhibits an enhanced 89% capacity retention at a rate of 1 C over that of pristine NCA (75.2%) after 150 cycles and effectively suppresses working voltage fade (a drop of 0.025 V after 300 cycles) during repeated charge-discharge cycles. In addition, the diffusion barrier of Li ions in NCA crystals at 0.80 V is noticeably smaller than that of Li ions in pristine NCA (0.87 eV). These findings demonstrate that this unique surface structure design considerably enhances cycle and rate performance of NCA, which has potential applications in other Ni-rich layered cathode materials.

Authors:
 [1];  [1];  [2];  [1];  [1];  [1];  [1]; ORCiD logo [2]
  1. Central South Univ., Changsha(China); National Engineering Lab. for High Efficiency Recovery of Refractory Nonferrous Metals, Changsha (China)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1602539
Alternate Identifier(s):
OSTI ID: 1579424
Grant/Contract Number:  
AC02-06CH11357; AC02‐06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Small
Additional Journal Information:
Journal Volume: 15; Journal Issue: 50; Journal ID: ISSN 1613-6810
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; LiNi0.8Co0.15A0.05O2; Lithium ion battery; Cathode material; Structure design; electrochemical performance

Citation Formats

Zheng, Junchao, Yang, Zhuo, Dai, Alvin, Tang, Linbo, Wei, Hanxin, Li, Yunjiao, He, Zhenjiang, and Lu, Jun. Boosting Cell Performance of LiNi0.8Co0.15A0.05O2 via Surface Structure Design. United States: N. p., 2019. Web. doi:10.1002/smll.201904854.
Zheng, Junchao, Yang, Zhuo, Dai, Alvin, Tang, Linbo, Wei, Hanxin, Li, Yunjiao, He, Zhenjiang, & Lu, Jun. Boosting Cell Performance of LiNi0.8Co0.15A0.05O2 via Surface Structure Design. United States. https://doi.org/10.1002/smll.201904854
Zheng, Junchao, Yang, Zhuo, Dai, Alvin, Tang, Linbo, Wei, Hanxin, Li, Yunjiao, He, Zhenjiang, and Lu, Jun. Wed . "Boosting Cell Performance of LiNi0.8Co0.15A0.05O2 via Surface Structure Design". United States. https://doi.org/10.1002/smll.201904854. https://www.osti.gov/servlets/purl/1602539.
@article{osti_1602539,
title = {Boosting Cell Performance of LiNi0.8Co0.15A0.05O2 via Surface Structure Design},
author = {Zheng, Junchao and Yang, Zhuo and Dai, Alvin and Tang, Linbo and Wei, Hanxin and Li, Yunjiao and He, Zhenjiang and Lu, Jun},
abstractNote = {Although the high energy density and environmental benignancy of LiNi0.8Co0.15A0.05O2 (NCA) holds promise for use as cathode material in Li-ion batteries, present low rate capabilities, and fast capacity fade limit its broad commercial applications. Here, it is reported that surface modification of NCA cathode (R-3m) with 5 nm-thick nanopillar layers and Fm-3m structures significantly improves electrode structure, morphology, and electrochemical performance. The formation of nanopillar layers increases cycling and working voltage stability of NCA by shielding the host material from hydrofluoric acid and improves structural stability with the electrolyte. The modified NCA cathode exhibits an enhanced 89% capacity retention at a rate of 1 C over that of pristine NCA (75.2%) after 150 cycles and effectively suppresses working voltage fade (a drop of 0.025 V after 300 cycles) during repeated charge-discharge cycles. In addition, the diffusion barrier of Li ions in NCA crystals at 0.80 V is noticeably smaller than that of Li ions in pristine NCA (0.87 eV). These findings demonstrate that this unique surface structure design considerably enhances cycle and rate performance of NCA, which has potential applications in other Ni-rich layered cathode materials.},
doi = {10.1002/smll.201904854},
journal = {Small},
number = 50,
volume = 15,
place = {United States},
year = {Wed Nov 13 00:00:00 EST 2019},
month = {Wed Nov 13 00:00:00 EST 2019}
}

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