Rotatable Methylene Ether Bridge Units Enabling High Chain Flexibility and Rapid Ionic Transport in a New Universal Aqueous Conductive Binder

Zhang, Farong1; Xia, Hongyu1; Wei, Tongye2; Liu, Bei1; Li, Huaming1,3; Lu, Zhouguang4; Yang, Mei1,3

2023-04-01

10.1002/adfm.202303339

ADVANCED FUNCTIONAL MATERIALS   影响因子和分区

1616-301X

1616-3028

Binders play an essential role in maintaining the mechanical integrity and stability of electrodes. Herein, a novel aqueous and conductive binder (OXP/CNT-1.5) consisting of carbon nanotubes (CNTs) interwoven with a flexible nano-film of oxidized pullulan (OXP) is designed. The rotatable methylene ether bridge units within OXP chain endow the binder with high chain flexibility, facilitate rapid ion transport, and buffer severe volumetric expansion during charge-discharge cycling. Furthermore, its tight intertwining with CNTs forms continuously conductive and flexible skeletons, which can firmly grasp active nanoparticles through a "face-to-point" bonding type, guaranteeing the electrodes high conductivity and outstanding mechanical integrity. More importantly, these conductive binders are applicable to the Si/C anode as well as the LiFePO4 cathode. The as-fabricated Si/C anode delivers a 88.2% capacity retention after 100 cycles and 80.2% capacity retention at 0.5 A g(-1) (vs 0.05 A g(-1)), far surpassing the electrode fabricated by conventional polyvinylidene fluoride binder and carbon black mixtures. The LiFePO4/Si/C full cells based on OXP/CNT-1.5 demonstrate excellent electrochemical behavior and stability (97.4% capacity retention after 100 cycles). This work highlights the key role of rotatable methylene ether bridge units to enhance the flexibility, ion conductivity, and stability, which is inspiring in the context of designing novel binders for high-performance batteries.

aqueous binders conductive Lithium-ion batteries oxidized pullulan rotatable units

SCI ; EI

英语

NI论文

通讯

National Natural Science Foundation of China[21?805?235]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000974118400001

WILEY-V C H VERLAG GMBH

20231714009540

Anodes ; Binders ; Carbon black ; Carbon nanotubes ; Electric discharges ; Ethers ; Fluorine compounds ; Ions ; Iron compounds ; Lithium compounds ; Silicon ; Silicon compounds

Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Electricity: Basic Concepts and Phenomena:701.1 ; Electron Tubes:714.1 ; Nanotechnology:761 ; Chemical Agents and Basic Industrial Chemicals:803 ; Organic Compounds:804.1 ; Crystalline Solids:933.1

MATERIALS SCIENCE

Web of Science

1.Xiangtan Univ, Coll Chem, Xiangtan 411105, Hunan, Peoples R China
2.Xiangtan Univ, Hunan Inst Adv Sensing & Informat Technol, Xiangtan 411105, Hunan, Peoples R China
3.Xiangtan Univ, Key Lab Adv Funct Polymer Mat Coll Hunan Prov, Key Lab Polymer Mat & Applicat Technol Hunan Prov, Key Lab Environm Friendly Chem & Applicat Minist E, Xiangtan 411105, Hunan, Peoples R China
4.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen Key Lab Interfacial Sci & Engn Mat, Shenzhen 518055, Guangdong, Peoples R China

Zhang, Farong,Xia, Hongyu,Wei, Tongye,et al. Rotatable Methylene Ether Bridge Units Enabling High Chain Flexibility and Rapid Ionic Transport in a New Universal Aqueous Conductive Binder[J]. ADVANCED FUNCTIONAL MATERIALS,2023,33(34).

Zhang, Farong.,Xia, Hongyu.,Wei, Tongye.,Liu, Bei.,Li, Huaming.,...&Yang, Mei.(2023).Rotatable Methylene Ether Bridge Units Enabling High Chain Flexibility and Rapid Ionic Transport in a New Universal Aqueous Conductive Binder.ADVANCED FUNCTIONAL MATERIALS,33(34).

Zhang, Farong,et al."Rotatable Methylene Ether Bridge Units Enabling High Chain Flexibility and Rapid Ionic Transport in a New Universal Aqueous Conductive Binder".ADVANCED FUNCTIONAL MATERIALS 33.34(2023).