Multifunctional solid polymer electrolytes for all-solid-state batteries

全固态电池用多功能固体聚合物电解质

• 批准号: 2033882
• 负责人: Christopher Li
• 金额: $ 31.87万
• 依托单位: Drexel University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-09-01 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2033882&HistoricalAwards=false
• 关键词: Multifunctional; solid; polymer; electrolytes; state

Lithium ion batteries are found in many daily use devices such as smartphones, laptop and tablet computers, cordless tools, and electric vehicles. However, there are safety concerns about these batteries, because failure in these devices can lead to a fire. For safe and efficient operation, lithium ion battery components have many requirements such as ionic conductivity, electrochemical stability, mechanical robustness, processability and fire retardance. In this research project, the investigators will use a tunable chemical platform to address these simultaneous requirements. This battery system includes a polymer network base that is made of chain-like molecules bonded together to form a highly connected scaffold. The system also includes comb-like structures that consist of polymers extending off the network scaffold. Additional components, such as stabilizers or fire retardants, can be added to the end of the combs to impart the corresponding properties to the system. By changing the structure or composition of the network scaffold, the investigators will study how the material properties can be altered to optimize the overall performance of the system. Using the concepts learned during this project, the participants will develop two class modules for a course on nanostructured polymeric materials. Additionally, high school students and teachers, particularly from groups under-represented in STEM fields, will be involved in the research activities via the Summer Engineering Experience at Drexel Program.In this research project the investigators aim to design, synthesize, and implement a series of multifunctional and versatile comb-chain crosslinker based network solid polymer electrolytes (ConSPEs). The versatility element comes from the large number of functional groups found on the ends of the chains and cross-linkers, which provide fast cross-linking and an opportunity to add further components. Using this platform the investigators will tune network chemistry, architecture, mechanical and electrochemical properties to address the high performance electrolyte needs. Specifically, components will be added to target a given, desired solid electrolyte property. For example, poly(propylene carbonate) would improve voltage stability and transference number, while grafted halogenated moieties would improve fire retardance, solid electrolyte interface formation and cycling performance. The investigators will characterize the materials using oscillatory shear and classical tensile mechanical measurements, and small-length scale dependent mechanical properties will be assessed using quantitative nanomechanical mapping via atomic force microcopy. Electrochemical characterizations include ion conductivity via electrochemical impedance and cycling stability via cyclic voltammetry. After establishing a library of ConSPE materials, the investigators will select two differing materials and combine them into bilayer structures. Such asymmetric bilayer materials might be more capable than a uniform materials of meeting the different requirements of the anode- and cathode-facing sides of the solid electrolyte.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

锂离子电池存在于许多日常使用的设备中，例如智能手机、笔记本电脑和平板电脑、无绳工具和电动车辆。然而，这些电池存在安全问题，因为这些设备的故障可能导致火灾。为了安全高效地运行，锂离子电池组件具有许多要求，例如离子导电性、电化学稳定性、机械坚固性、可加工性和阻燃性。在这个研究项目中，研究人员将使用一个可调的化学平台来解决这些同时存在的需求。这种电池系统包括一个聚合物网络基础，它是由链状分子结合在一起形成一个高度连接的支架。该系统还包括梳状结构，其由延伸离开网络支架的聚合物组成。可以将额外的组分（例如稳定剂或阻燃剂）添加到梳状物的端部以赋予系统相应的性能。通过改变网络支架的结构或组成，研究人员将研究如何改变材料特性以优化系统的整体性能。使用在这个项目中学到的概念，参与者将开发两个类模块的纳米结构聚合物材料的课程。此外，高中学生和教师，特别是来自STEM领域代表性不足的群体，将通过德雷克塞尔暑期工程体验项目参与研究活动。在该研究项目中，研究人员旨在设计，合成和实现一系列多功能和多用途的梳状链交联剂基网络固体聚合物电解质（ConSPE）。多功能性元素来自于在链和交联剂的末端发现的大量官能团，其提供快速交联和添加其他组分的机会。利用这个平台，研究人员将调整网络化学、结构、机械和电化学特性，以满足高性能电解质的需求。具体地，将添加组分以达到给定的所需固体电解质性质。例如，聚（碳酸亚丙酯）将改善电压稳定性和迁移数，而接枝的卤化部分将改善阻燃性、固体电解质界面形成和循环性能。研究人员将使用振荡剪切和经典拉伸力学测量来表征材料，并将通过原子力显微镜使用定量纳米力学映射来评估小长度尺度相关的机械性能。电化学表征包括通过电化学阻抗的离子电导率和通过循环伏安法的循环稳定性。在建立了ConSPE材料库之后，研究人员将选择两种不同的材料，并将它们联合收割机组合成双层结构。这种非对称双层材料可能比均匀材料更能满足固体电解质面向阳极和阴极侧的不同要求。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Interpenetrating Network-Based Hybrid Solid and Gel Electrolytes for High Voltage Lithium Metal Batteries

• DOI: 10.1021/acsaem.1c00451
• 发表时间: 2021-06
• 作者: Yongwei Zheng;Xiaowei Li;William R. Fullerton;Qiang Qian;Mingwei Shang;J. Niu;Christopher Y. Li

Decoupling the Modulus and Toughness Effects of Solid Polymer Electrolytes in All-Solid-State Lithium Batteries

解耦全固态锂电池中固体聚合物电解质的模量和韧性影响

• DOI: 10.1021/acsaem.1c02857
• 发表时间: 2021
• 期刊: ACS Applied Energy Materials
• 影响因子: 6.4
• 作者: Zheng, Yongwei;Li, Xiaowei;Fullerton, William R.;Li, Christopher Y.
• 通讯作者: Li, Christopher Y.

Designing Comb-Chain Crosslinker-Based Solid Polymer Electrolytes for Additive-Free All-Solid-State Lithium Metal Batteries

• DOI: 10.1021/acs.nanolett.0c03033
• 发表时间: 2020-09-09
• 期刊: NANO LETTERS
• 影响因子: 10.8
• 作者: Li, Xiaowei;Zheng, Yongwei;Li, Christopher Y.
• 通讯作者: Li, Christopher Y.