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Title: Understanding the role of water-soluble guar gum binder in reducing capacity fading and voltage decay of Li-rich cathode for Li-ion batteries

Abstract

The practical application of high-capacity Li-rich cathode materials is hindered by capacity fading and voltage decay. The capacity fading and voltage decay could be effectively overcome by using water-soluble guar gum (GG) binder instead of traditional polyvinylidene fluoride (PVDF). However, the specific role of the GG binder is not clear yet, though the GG binder can significantly improve the electrochemical performance of Li-rich cathode. To understand the effect of GG binder on the morphology, microstructure of electrode and electrode/electrolyte interfaces, ex-situ scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray adsorption near edge spectroscopy (XANES), in-situ electrochemical impedance spectroscopy (EIS) were applied to comparatively study the charge-discharge processes of Li-rich Li 1.2Ni 0.2Mn 0.6O 2 cathode when using GG and PVDF as binders. The results indicate that the GG binder can prevent electrode crack and active material loss, ascribing to the strong mechanical adhesion of GG binder with active material particles and current collector. It has found that the GG binder can also induce the formation of a uniform layer on Li 1.2Ni 0.2Mn 0.6O 2 particles’ surface. As a consequence, both the electrolyte decomposition and the electrode corrosion were significantly inhibited. The strong chelation between Mn 2+ and polarmore » OH group restrain Mn ion dissolution, which contributes to surface structural transformation mitigation. Here, our study reveals the role of water-soluble GG binder in reducing capacity fading and voltage decay of Li-rich material and is of great importance in design functional binders for high-performance Li-rich electrodes.« less

Authors:
 [1];  [2];  [2];  [2];  [1];  [3];  [2];  [2];  [4];  [2]
  1. Xiamen Univ. (China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Xiamen Univ. (China)
  3. Chinese Academy of Sciences (CAS), Shanghai (China)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Natural Science Foundation of China (NNSFC); China Scholarship Council
OSTI Identifier:
1642700
Grant/Contract Number:  
AC02-05CH11231; 21621091; 201606310151
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Electrochimica Acta
Additional Journal Information:
Journal Volume: 351; Journal ID: ISSN 0013-4686
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
lithium ion batteries; Li-rich material cathode; water-soluble binder; in-situ and ex-situ techniques; capacity fading; voltage decay

Citation Formats

Yin, Zu-Wei, Zhang, Tao, Zhang, Shao-Jian, Deng, Ya-Ping, Peng, Xin-Xing, Wang, Jian-Qiang, Li, Jun-Tao, Huang, Ling, Zheng, Haimei, and Sun, Shi-Gang. Understanding the role of water-soluble guar gum binder in reducing capacity fading and voltage decay of Li-rich cathode for Li-ion batteries. United States: N. p., 2020. Web. doi:10.1016/j.electacta.2020.136401.
Yin, Zu-Wei, Zhang, Tao, Zhang, Shao-Jian, Deng, Ya-Ping, Peng, Xin-Xing, Wang, Jian-Qiang, Li, Jun-Tao, Huang, Ling, Zheng, Haimei, & Sun, Shi-Gang. Understanding the role of water-soluble guar gum binder in reducing capacity fading and voltage decay of Li-rich cathode for Li-ion batteries. United States. doi:10.1016/j.electacta.2020.136401.
Yin, Zu-Wei, Zhang, Tao, Zhang, Shao-Jian, Deng, Ya-Ping, Peng, Xin-Xing, Wang, Jian-Qiang, Li, Jun-Tao, Huang, Ling, Zheng, Haimei, and Sun, Shi-Gang. Wed . "Understanding the role of water-soluble guar gum binder in reducing capacity fading and voltage decay of Li-rich cathode for Li-ion batteries". United States. doi:10.1016/j.electacta.2020.136401.
@article{osti_1642700,
title = {Understanding the role of water-soluble guar gum binder in reducing capacity fading and voltage decay of Li-rich cathode for Li-ion batteries},
author = {Yin, Zu-Wei and Zhang, Tao and Zhang, Shao-Jian and Deng, Ya-Ping and Peng, Xin-Xing and Wang, Jian-Qiang and Li, Jun-Tao and Huang, Ling and Zheng, Haimei and Sun, Shi-Gang},
abstractNote = {The practical application of high-capacity Li-rich cathode materials is hindered by capacity fading and voltage decay. The capacity fading and voltage decay could be effectively overcome by using water-soluble guar gum (GG) binder instead of traditional polyvinylidene fluoride (PVDF). However, the specific role of the GG binder is not clear yet, though the GG binder can significantly improve the electrochemical performance of Li-rich cathode. To understand the effect of GG binder on the morphology, microstructure of electrode and electrode/electrolyte interfaces, ex-situ scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray adsorption near edge spectroscopy (XANES), in-situ electrochemical impedance spectroscopy (EIS) were applied to comparatively study the charge-discharge processes of Li-rich Li1.2Ni0.2Mn0.6O2 cathode when using GG and PVDF as binders. The results indicate that the GG binder can prevent electrode crack and active material loss, ascribing to the strong mechanical adhesion of GG binder with active material particles and current collector. It has found that the GG binder can also induce the formation of a uniform layer on Li1.2Ni0.2Mn0.6O2 particles’ surface. As a consequence, both the electrolyte decomposition and the electrode corrosion were significantly inhibited. The strong chelation between Mn2+ and polar OH group restrain Mn ion dissolution, which contributes to surface structural transformation mitigation. Here, our study reveals the role of water-soluble GG binder in reducing capacity fading and voltage decay of Li-rich material and is of great importance in design functional binders for high-performance Li-rich electrodes.},
doi = {10.1016/j.electacta.2020.136401},
journal = {Electrochimica Acta},
issn = {0013-4686},
number = ,
volume = 351,
place = {United States},
year = {2020},
month = {5}
}

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