Explore Electrocatalysis to Improve the Cathode Performance in Li-S Batteries

探索电催化提高锂硫电池正极性能

• 批准号: 2054754
• 负责人: Jun Li
• 金额: $ 38.64万
• 依托单位: Kansas State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-07-15 至 2025-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2054754&HistoricalAwards=false
• 关键词: Explore; Electrocatalysis; Improve; Cathode; Performance

Lithium-ion batteries are leading technologies for electric vehicles and large-scale renewable energy storage. Lithium-sulfur battery technology, in particular, is a forerunner of next-generation lithium-ion batteries due to their material availability and their high energy density. The project will investigate a new electrocatalytic concept for improving the performance of lithium sulfide batteries. Specifically, the goal is to enhance charge/discharge rates and suppress battery deactivation, both of which are limiting the performance of current Li-S batteries. Beyond the technical aspects, the project includes educational and outreach activities, focusing on underrepresented students from middle- and high-school to graduate level. Advances in LiS battery technology are hindered by several critical barriers, including the low electrical conductivity of elemental S and discharged product Li2S at the cathode, high overpotentials, and the rapid capacity fading of the S cathode due to diffusion of soluble lithium polysulfide (LiPS) intermediates from the cathode to react with the Li anode, notoriously known as the “shuttle effect”. Transition metal sulfide electrocatalysts with strong adsorption of LiPS intermediates will be explored to accelerate the conversion between S and Li2S, the two insoluble end products. The project focuses on improving the cathode performance based on the new electrocatalytic concept using two types of hybrid materials as the electrocatalysts, i.e. the two-dimensional (2D) atomic layered MoS2 and the quasi-1D chain-like VS4, both strongly attached on highly conductive reduced graphene oxide (rGO) nanosheets. The specific objectives include (1) catalyst synthesis and characterization (including their ability for LiPS adsorption and electrocatalytic conversion); (2) electrocatalytic LiPS trapping and conversion (via hybrid materials incorporation in the interlayer and the S/C cathode, respectively), and (3) electrocatalytic conversion of Li2S to S. The MoS2/rGO and VS4/rGO catalysts will be incorporated in the lithium-loaded Li2S/C cathode to reduce the activation energy of the initial delithiation of Li2S and enable a stable and reversible Li2S/C cathode. Electrochemical characterizations will be correlated with both ex-situ and operando micro-Raman spectroscopy studies to provide a good understanding of the dynamic charge/discharge processes and render mechanistic insights of the electrocatalysis. These studies will provide solutions to realize the full potentials of the Li-S batteries, an important sustainable energy technology. In addition to the technical objectives, this project provides cross-disciplinary training in nanomaterials synthesis/characterization, electrochemistry, catalysis and energy storage technologies to two graduate students and one undergraduate student. The project team will participate in summer STEM camps to engage with high/middle school students (particularly girls in Kansas) and provide hands-on workshops using the materials developed in this project. An outreach effort will be made through a strong collaboration with Xavier University of Louisiana (XULA), a Historically Black Colleges and Universities (HBCU), to host visiting undergraduate students from XULA for summer research on electrical energy storage in Kansas State University.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.

锂离子电池是电动汽车和大规模可再生能源存储的领先技术。尤其是锂硫电池技术，由于其材料可用性和高能密度，是下一代锂离子电池的先驱。该项目将研究一种新的电催化概念，以改善硫化锂电池的性能。具体而言，目标是提高电荷/放电率并抑制电池停用，这两者都限制了当前LI-S电池的性能。除了技术方面，该项目还包括教育和外展活动，重点是从中学和高中到研究生水平的人数不足的学生。 LIS电池技术的进步受到了几个关键障碍的阻碍，包括元素S和在阴极处排出的产品LI2的低电导率，高电位高电位，以及由于可溶性锂多硫化物（LIPS）中间体的扩散而导致S阴极引起的快速衰减，与天主教徒从liandode中反应，与非洲liane的反应，不知名地效应是shite shteltime shite shteltime shteltime of shite''将探索具有强烈吸附的嘴唇中间体的过渡金属硫化物电催化剂，以加速S和Li2s之间的转化，这是两个不溶性的最终产物。该项目的重点是基于新的电催化概念来改善阴极性能，使用两种类型的混合材料（即电催化剂），即二维（2D）原子分层（2D）原子分层和Quasi-1D链的MOS4，类似于高度有效的氧化石墨烯（RGO）nanosheets nanosheets nanosheets。特定对象包括（1）催化剂合成和表征（包括其嘴唇的能力增加了吸附和电催化转化率）； （2）电催化性嘴唇陷阱和转化（通过层中和S/C阴极中纳入的杂化材料，电化学特征将与Ex-Situ和Operando Micro-Raman光谱研究相关联可持续的能源技术。除了技术目标外，该项目在纳米材料的综合/特征，电化学，催化和储能技术方面为两个研究生和一名本科生提供了参与夏季茎的一部分，并提供了一定的材料。 collaboration with Xavier University of Louisiana (XULA), a Historically Black Colleges and Universities (HBCU), to host visiting undergraduate students from XULA for summer research on electrical energy storage in Kansas State University.This award reflects NSF's statutory mission and has been deemed honestly of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

项目成果

Binder-free Li-O 2 battery cathodes using Ni- and PtRu-coated vertically aligned carbon nanofibers as electrocatalysts for enhanced stability

使用 Ni 和 PtRu 涂层垂直排列碳纳米纤维作为电催化剂以增强稳定性的无粘合剂 Li-O 2 电池阴极

• DOI: 10.26599/nre.2023.9120055
• 发表时间: 2023
• 期刊: Nano Research Energy
• 作者: Hassan Zaidi, Syed Shoaib;Rajendran, Sabari;Sekar, Archana;Elangovan, Ayyappan;Li, Jun;Li, Xianglin
• 通讯作者: Li, Xianglin

Mechanistic understanding of Li metal anode processes in a model 3D conductive host based on vertically aligned carbon nanofibers

• DOI: 10.1016/j.carbon.2023.118174
• 发表时间: 2023-05-31
• 期刊: CARBON
• 影响因子: 10.9
• 作者: Rajendran，Sabari;Sekar，Archana;Li，Jun
• 通讯作者: Li，Jun