Highly Elastic Block Copolymer Binders for Silicon Anodes in Lithium-Ion Batteries

Wang, Xiao; Liu, Shujie; Zhang, Yijun; Wang, Haiye; Aboalhassan, Ahmed A.; Li, Guang; Xu, Gang; Xue, Chenliang; Yu, Jianyong; Yan, Jianhua; Ding, Bin

doi:10.1021/acsami.0c10005

Cited by 49 publications

(38 citation statements)

References 34 publications

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“…Here, the viscoelastic and piezoelectric block copolymer of PVDF‐ b ‐PTFE with high ionic conductivity was synthesized by us and was recently reported as a new battery binder. [ 37 ] The block copolymer has just been commercialized in Daikin Fluorochemicals Co., Ltd., China. In addition, we have developed a polymer template induced assembly strategy, based on sol–gel electrospinning followed by calcination ( Figure a), to fabricate super‐tough and highly flexible LLTO crystal nanofiber films with controllable thickness.…”

Section: Resultsmentioning

confidence: 99%

Solid‐State Lithium Metal Batteries with Extended Cycling Enabled by Dynamic Adaptive Solid‐State Interfaces

Liu

Zhao

et al. 2021

Advanced Materials

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Improving the long-term cycling stability of solid-state lithium (Li)-metal batteries (SSBs) is a severe challenge because of the notorious solid-solid interfacial contact loss originating from the repeated expansion and contraction of the Li anodes. Here, it is reported that high-performance SSBs are enabled by constructing brick-and-mortar electrolytes that can dynamically adapt to the interface changes during cycling. An electrolyte film with a high mechanical strain (250%) is fabricated by filling viscoelastic (600% strain) and piezoelectric block-copolymer electrolytes (mortar) into a mixed conductor Li 0.33 La 0.56 TiO 3-x nanofiber film (brick). During Li-plating, the electrolytes can homogenize the interfacial electric field and generate piezoelectricity to promote uniform Li-deposition, while the mortar can adhere to the Li-anode without interfacial disintegration in the reversed Li-stripping. As a result, the electrolytes show excellent compatibility with the electrodes, leading to a long electrochemical cyclability at room temperature. The symmetrical Li//Li cells run stably for 1880 h without forming dendrites, and the LiFePO 4 /Li full batteries deliver high coulombic efficiency (>99.5%) and capacity retention (>85%) over 550 cycles. More practically, the pouch cells exhibit excellent flexibility and safety for potential practical applications.

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Section: Resultsmentioning

confidence: 99%

Solid‐State Lithium Metal Batteries with Extended Cycling Enabled by Dynamic Adaptive Solid‐State Interfaces

Liu

Zhao

et al. 2021

Advanced Materials

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“…The polyacrylamide provided strong adhesion in the electrode with resistance to the penetration of the organic electrolyte. And, ionic and covalent cross-linkings in the binder could maintain their intrinsic good binding properties and additionally enhance lithium-ion diffusion, thus leading to excellent cyclability ( Gendensuren and Oh, 2018 ) Similarly, Wang et al developed a tough block copolymer PVDF-b-teflon (PTFE) binder that could coalesce pulverized Si and thus enhanced the stability of Si anodes ( Wang et al, 2020 ).…”

Section: Binders In Si-based Anodesmentioning

confidence: 99%

Progress of Binder Structures in Silicon-Based Anodes for Advanced Lithium-Ion Batteries: A Mini Review

et al. 2021

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Silicon (Si) has been counted as the most promising anode material for next-generation lithium-ion batteries, owing to its high theoretical specific capacity, safety, and high natural abundance. However, the commercial application of silicon anodes is hindered by its huge volume expansions, poor conductivity, and low coulombic efficiency. For the anode manufacture, binders play an important role of binding silicon materials, current collectors, and conductive agents, and the binder structure can significantly affect the mechanical durability, adhesion, ionic/electronic conductivities, and solid electrolyte interface (SEI) stability of the silicon anodes. Moreover, many cross-linked binders are effective in alleviating the volume expansions of silicon nanosized even microsized anodic materials along with maintaining the anode integrity and stable electrochemical performances. This mini review comprehensively summarizes various binders based on their structures, including the linear, branched, three-dimensional (3D) cross-linked, conductive polymer, and other hybrid binders. The mechanisms how various binder structures influence the performances of the silicon anodes, the limitations, and prospects of different hybrid binders are also discussed. This mini review can help in designing hybrid polymer binders and facilitating the practical application of silicon-based anodes with high electrochemical activity and long-term stability.

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“…II) Another strategy is to develop highly elastic polymer binders by balancing their molecular structures with the contents of coordination and covalent bonds. [148][149][150][151] This strategy improves Young's modulus and damage resistance of polymer binders, as well as their Si-based battery lifetime. [152,153] More importantly, the applications and prospects of both good self-healing and highly elastic polymer binders in Si-based full cells are summarized, which deliver superior capacity retention and significant guidance value.…”

Section: Introductionmentioning

confidence: 99%

Silicon‐Based Lithium Ion Battery Systems: State‐of‐the‐Art from Half and Full Cell Viewpoint

Guo

Dong

Wang

et al. 2021

Adv Funct Materials

121

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Lithium‐ion batteries (LIBs) have been occupying the dominant position in energy storage devices. Over the past 30 years, silicon (Si)‐based materials are the most promising alternatives for graphite as LIB anodes due to their high theoretical capacities and low operating voltages. Nevertheless, their extensive volume changes in battery operation causes the structural collapse of Si‐based electrodes, as well as severe side reactions. In this review, the preparation methods and structure optimizations of Si‐based materials are highlighted, as well as their applications in half and full cells. Meanwhile, the developments of promising electrolytes, binders and separators that match Si‐based electrodes in half and full cells have made great progress. Pre‐lithiation technology has been introduced to compensate for irreversible Li+ consumption during battery operation, thereby improving the energy densities and lifetime of Si‐based full cells. More importantly, almost all related mechanisms of Si‐based electrodes in half and full cells are summarized in detail. It is expected to provide a comprehensive insight on how to develop high‐performance Si‐based full cells. The work can help us understand what happens during the lithiation process, the primary causes of Si‐based half and full cells failure, and strategies to overcome these challenges.

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Highly Elastic Block Copolymer Binders for Silicon Anodes in Lithium-Ion Batteries

Cited by 49 publications

References 34 publications

Solid‐State Lithium Metal Batteries with Extended Cycling Enabled by Dynamic Adaptive Solid‐State Interfaces

Solid‐State Lithium Metal Batteries with Extended Cycling Enabled by Dynamic Adaptive Solid‐State Interfaces

Progress of Binder Structures in Silicon-Based Anodes for Advanced Lithium-Ion Batteries: A Mini Review

Silicon‐Based Lithium Ion Battery Systems: State‐of‐the‐Art from Half and Full Cell Viewpoint

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