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Title: Ionically Conductive Self-Healing Binder for Low Cost Si Microparticles Anodes in Li-Ion Batteries

Abstract

A self-healing polymer (SHP) with abundant hydrogen bonds, appropriate viscoelasticity, and stretchability is a promising binder to improve cycle performance of Si microparticle anodes in lithium (Li) ion batteries. Besides high capacity and long cycle life, efficient rate performance is strongly desirable for practical Si anode implementation. Here in this paper, polyethylene glycol (PEG) groups are incorporated into the SHP, facilitating Li ionic conduction within the binder. The concept of the SHP-PEG binder involves improving the interface between Si microparticles and electrolytes after cycling based on the combination of self-healing ability and fast Li ionic conduction. Through the systematic study of mixing PEG M w and ratio, the polymeric binder combining SHP and PEG with Mw 750 in an optimal ratio of 60:40 (mol%) achieves a high discharging capacity of ≈2600 mA h g -1, reasonable rate performance especially when >1C and maintains 80% of their initial capacity even after ≈150 cycles at 0.5C. The described concept for the polymeric binder, embedding both self-healing ability and high Li ionic conductivity, should be equally useful for next generation batteries utilizing high capacity materials which suffer from huge volume change during cycling.

Authors:
ORCiD logo [1];  [2];  [2];  [2];  [2];  [2];  [3];  [2]
  1. Stanford Univ., CA (United States). Dept. of Chemical Engineering; Sony Corporation, Fukushima (Japan). Products Development Dept.
  2. Stanford Univ., CA (United States). Dept. of Chemical Engineering
  3. Stanford Univ., CA (United States). Dept. of Materials Science and Engineering
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1461894
Alternate Identifier(s):
OSTI ID: 1420184
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Advanced Energy Materials
Additional Journal Information:
Journal Volume: 8; Journal Issue: 14; Journal ID: ISSN 1614-6832
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 36 MATERIALS SCIENCE; ionic conductivity; lithium-ion batteries; microparticles; self-healing, silicon

Citation Formats

Munaoka, Takatoshi, Yan, Xuzhou, Lopez, Jeffrey, To, John W. F., Park, Jihye, Tok, Jeffrey B. -H., Cui, Yi, and Bao, Zhenan. Ionically Conductive Self-Healing Binder for Low Cost Si Microparticles Anodes in Li-Ion Batteries. United States: N. p., 2018. Web. doi:10.1002/aenm.201703138.
Munaoka, Takatoshi, Yan, Xuzhou, Lopez, Jeffrey, To, John W. F., Park, Jihye, Tok, Jeffrey B. -H., Cui, Yi, & Bao, Zhenan. Ionically Conductive Self-Healing Binder for Low Cost Si Microparticles Anodes in Li-Ion Batteries. United States. doi:10.1002/aenm.201703138.
Munaoka, Takatoshi, Yan, Xuzhou, Lopez, Jeffrey, To, John W. F., Park, Jihye, Tok, Jeffrey B. -H., Cui, Yi, and Bao, Zhenan. Mon . "Ionically Conductive Self-Healing Binder for Low Cost Si Microparticles Anodes in Li-Ion Batteries". United States. doi:10.1002/aenm.201703138. https://www.osti.gov/servlets/purl/1461894.
@article{osti_1461894,
title = {Ionically Conductive Self-Healing Binder for Low Cost Si Microparticles Anodes in Li-Ion Batteries},
author = {Munaoka, Takatoshi and Yan, Xuzhou and Lopez, Jeffrey and To, John W. F. and Park, Jihye and Tok, Jeffrey B. -H. and Cui, Yi and Bao, Zhenan},
abstractNote = {A self-healing polymer (SHP) with abundant hydrogen bonds, appropriate viscoelasticity, and stretchability is a promising binder to improve cycle performance of Si microparticle anodes in lithium (Li) ion batteries. Besides high capacity and long cycle life, efficient rate performance is strongly desirable for practical Si anode implementation. Here in this paper, polyethylene glycol (PEG) groups are incorporated into the SHP, facilitating Li ionic conduction within the binder. The concept of the SHP-PEG binder involves improving the interface between Si microparticles and electrolytes after cycling based on the combination of self-healing ability and fast Li ionic conduction. Through the systematic study of mixing PEG Mw and ratio, the polymeric binder combining SHP and PEG with Mw 750 in an optimal ratio of 60:40 (mol%) achieves a high discharging capacity of ≈2600 mA h g-1, reasonable rate performance especially when >1C and maintains 80% of their initial capacity even after ≈150 cycles at 0.5C. The described concept for the polymeric binder, embedding both self-healing ability and high Li ionic conductivity, should be equally useful for next generation batteries utilizing high capacity materials which suffer from huge volume change during cycling.},
doi = {10.1002/aenm.201703138},
journal = {Advanced Energy Materials},
number = 14,
volume = 8,
place = {United States},
year = {2018},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 14 works
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Figures / Tables:

Figure 1 Figure 1: a) Schematic chemical structure of the SHP‐PEG binder. b) Schematic illustration of the Si microparticle electrode with SHPPEG binder. i) Self‐healing based on dynamic hydrogen bonding close to a crack caused after cycling. ii) Li ion conduction facilitated by PEG groups.

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    Works referencing / citing this record:

    Smart Materials and Design toward Safe and Durable Lithium Ion Batteries
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    Smart Materials and Design toward Safe and Durable Lithium Ion Batteries
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