Rational Design of Composite Solid Electrolyte for Structural Energy Storage

Abstract

This project focuses on developing structural batteries with high energy density. In the last two years, we have developed two systems for structural energy storage. The first one is to combine high-energy-density Li/S battery with T300 carbon fibers and ceramic/polymer composite solid electrolyte, which leads to high modulus of 10-15 GPa at cell level and high strength of tilde150 MPa. The second one is solid state Li batteries with a solid polymer/ceramic electrolyte inspired by the brick-mortar structure of nacre, where polymer filler enhances the fracture energy of the ceramic electrolyte so that the electrolyte is much tougher than pure ceramic electrolyte. The major achievements include: 1) Solid composite electrolytes with high ionic conductivities and good mechanical properties, such as a nacre-like LATP/polymer electrolyte with conductivity of tilde8 x 1011-4 Siem, and fracture strain, flexural strength and modulus of 1.1 percent, 35 MPa and 7.8 GPa, respectively, and a BN/PVdF composite electrolyte with conductivity of tilde3.6 x 1011-4 Siem, which functions well under compression of 190 MPa (limit of current instrument, 2) prototype Li-S battery demonstrated with structural components (e.g. carbon fabric-reinforced cathode/anode). The capacity reaches 1100 mAh/g with a retention of 95 percent/100 cycles. The cell functions well under a compressive pressure of 20 MPa, while conventional cells fail at tilde10 MPa, and 3) one paper entitled 'Nacre-Inspired Composite Electrolytes for Load-Bearing Solid-State Lithium Metal Batteries' published in Advanced Materials (IF:25.8), which has been cited for 9 times in only eight months, and one paper entitled 'Mechanically-robust structural lithium-sulfur battery with high energy density' under review in Energy Storage Materials (IF: 16.0)

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Document Details

Document Type
Technical Report
Publication Date
Jul 29, 2020
Accession Number
AD1107208

Entities

People

  • Yuan Yang

Organizations

  • Columbia University

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Advanced Materials
  • Carbon Fibers
  • Compressive Strength
  • Electrolytes
  • Energy
  • Energy Storage
  • Flexural Strength
  • Lithium Ion Batteries
  • Materials
  • Mechanical Properties
  • Mechanical Working
  • Particles
  • Polymer Matrix Composites
  • Stress Strain Relations
  • Stresses
  • Structural Components
  • Tensile Strength

Fields of Study

  • Materials science

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Nanocomposite Materials Science
  • Reinforced Composite Materials