Slidable and Highly Ionic Conductive Polymer Binder for High‐Performance Si Anodes in Lithium‐Ion Batteries

Abstract Silicon is expected to become the ideal anode material for the next generation of high energy density lithium battery because of its high theoretical capacity (4200 mAh g−1). However, for silicon electrodes, the initial coulombic efficiency (ICE) is low and the volume of the electrode chang...

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Main Authors: Yifeng Cai, Caixia Liu, Zhiao Yu, Wencan Ma, Qi Jin, Ruichun Du, Bingyun Qian, Xinxin Jin, Haomin Wu, Qiuhong Zhang, Xudong Jia
Format: Article
Language:English
Published: Wiley 2023-02-01
Series:Advanced Science
Subjects:
Online Access:https://doi.org/10.1002/advs.202205590
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author Yifeng Cai
Caixia Liu
Zhiao Yu
Wencan Ma
Qi Jin
Ruichun Du
Bingyun Qian
Xinxin Jin
Haomin Wu
Qiuhong Zhang
Xudong Jia
author_facet Yifeng Cai
Caixia Liu
Zhiao Yu
Wencan Ma
Qi Jin
Ruichun Du
Bingyun Qian
Xinxin Jin
Haomin Wu
Qiuhong Zhang
Xudong Jia
author_sort Yifeng Cai
collection DOAJ
description Abstract Silicon is expected to become the ideal anode material for the next generation of high energy density lithium battery because of its high theoretical capacity (4200 mAh g−1). However, for silicon electrodes, the initial coulombic efficiency (ICE) is low and the volume of the electrode changes by over 300% after lithiation. The capacity of the silicon electrode decreases rapidly during cycling, hindering the practical application. In this work, a slidable and highly ionic conductive flexible polymer binder with a specific single‐ion structure (abbreviated as SSIP) is presented in which polyrotaxane acts as a dynamic crosslinker. The ionic conducting network is expected to reduce the overall resistance, improve ICE and stabilize the electrode interface. Furthermore, the introduction of slidable polyrotaxane increases the reversible dynamics of the binder and improves the long‐term cycling stability and rate performance. The silicon anode based on SSIP provides a discharge capacity of ≈1650 mAh g−1 after 400 cycles at 0.5C with a high ICE of upto 92.0%. Additionally, the electrode still exhibits a high ICE of 87.5% with an ultra‐high Si loading of 3.84 mg cm−2 and maintains a satisfying areal capacity of 5.9 mAh cm−2 after 50 cycles, exhibiting the potential application of SSIP in silicon‐based anodes.
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spelling doaj.art-70fc15afb6744b428bd670b2fc7fa7b62023-02-24T12:27:40ZengWileyAdvanced Science2198-38442023-02-01106n/an/a10.1002/advs.202205590Slidable and Highly Ionic Conductive Polymer Binder for High‐Performance Si Anodes in Lithium‐Ion BatteriesYifeng Cai0Caixia Liu1Zhiao Yu2Wencan Ma3Qi Jin4Ruichun Du5Bingyun Qian6Xinxin Jin7Haomin Wu8Qiuhong Zhang9Xudong Jia10Key Laboratory of High‐Performance Polymer Material and Technology of MOE Department of Polymer Science and Engineering School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. ChinaKey Laboratory of High‐Performance Polymer Material and Technology of MOE Department of Polymer Science and Engineering School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. ChinaDepartment of Chemical Engineering Stanford University Stanford CA 95403 USAKey Laboratory of High‐Performance Polymer Material and Technology of MOE Department of Polymer Science and Engineering School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. ChinaKey Laboratory of High‐Performance Polymer Material and Technology of MOE Department of Polymer Science and Engineering School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. ChinaKey Laboratory of High‐Performance Polymer Material and Technology of MOE Department of Polymer Science and Engineering School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. ChinaKey Laboratory of High‐Performance Polymer Material and Technology of MOE Department of Polymer Science and Engineering School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. ChinaKey Laboratory of High‐Performance Polymer Material and Technology of MOE Department of Polymer Science and Engineering School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. ChinaKey Laboratory of High‐Performance Polymer Material and Technology of MOE Department of Polymer Science and Engineering School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. ChinaKey Laboratory of High‐Performance Polymer Material and Technology of MOE Department of Polymer Science and Engineering School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. ChinaKey Laboratory of High‐Performance Polymer Material and Technology of MOE Department of Polymer Science and Engineering School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. ChinaAbstract Silicon is expected to become the ideal anode material for the next generation of high energy density lithium battery because of its high theoretical capacity (4200 mAh g−1). However, for silicon electrodes, the initial coulombic efficiency (ICE) is low and the volume of the electrode changes by over 300% after lithiation. The capacity of the silicon electrode decreases rapidly during cycling, hindering the practical application. In this work, a slidable and highly ionic conductive flexible polymer binder with a specific single‐ion structure (abbreviated as SSIP) is presented in which polyrotaxane acts as a dynamic crosslinker. The ionic conducting network is expected to reduce the overall resistance, improve ICE and stabilize the electrode interface. Furthermore, the introduction of slidable polyrotaxane increases the reversible dynamics of the binder and improves the long‐term cycling stability and rate performance. The silicon anode based on SSIP provides a discharge capacity of ≈1650 mAh g−1 after 400 cycles at 0.5C with a high ICE of upto 92.0%. Additionally, the electrode still exhibits a high ICE of 87.5% with an ultra‐high Si loading of 3.84 mg cm−2 and maintains a satisfying areal capacity of 5.9 mAh cm−2 after 50 cycles, exhibiting the potential application of SSIP in silicon‐based anodes.https://doi.org/10.1002/advs.202205590Li‐ion batterypolymer binderspolyrotaxanesilicon anodesingle‐ion conductors
spellingShingle Yifeng Cai
Caixia Liu
Zhiao Yu
Wencan Ma
Qi Jin
Ruichun Du
Bingyun Qian
Xinxin Jin
Haomin Wu
Qiuhong Zhang
Xudong Jia
Slidable and Highly Ionic Conductive Polymer Binder for High‐Performance Si Anodes in Lithium‐Ion Batteries
Advanced Science
Li‐ion battery
polymer binders
polyrotaxane
silicon anode
single‐ion conductors
title Slidable and Highly Ionic Conductive Polymer Binder for High‐Performance Si Anodes in Lithium‐Ion Batteries
title_full Slidable and Highly Ionic Conductive Polymer Binder for High‐Performance Si Anodes in Lithium‐Ion Batteries
title_fullStr Slidable and Highly Ionic Conductive Polymer Binder for High‐Performance Si Anodes in Lithium‐Ion Batteries
title_full_unstemmed Slidable and Highly Ionic Conductive Polymer Binder for High‐Performance Si Anodes in Lithium‐Ion Batteries
title_short Slidable and Highly Ionic Conductive Polymer Binder for High‐Performance Si Anodes in Lithium‐Ion Batteries
title_sort slidable and highly ionic conductive polymer binder for high performance si anodes in lithium ion batteries
topic Li‐ion battery
polymer binders
polyrotaxane
silicon anode
single‐ion conductors
url https://doi.org/10.1002/advs.202205590
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