UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

A Solid-State Battery Cathode with a Polymer Composite Electrolyte and Low Tortuosity Microstructure by Directional Freezing and Polymerization

Huang, C; Leung, CLA; Leung, P; Grant, PS; (2020) A Solid-State Battery Cathode with a Polymer Composite Electrolyte and Low Tortuosity Microstructure by Directional Freezing and Polymerization. Advanced Energy Materials 10.1002/aenm.202002387. (In press). Green open access

[img]
Preview
Text
J0011_2020_final. A Solid‐State Battery Cathode with a Polymer Composite Electrolyte and Low Tortuosity Microstructure by Directional Freezing and Polymerization.pdf - Published version

Download (2MB) | Preview

Abstract

Solid‐state Li metal batteries (SSLMBs) combine improved safety and high specific energy that can surpass current Li ion batteries. However, the Li^{+} ion diffusivity in a composite cathode—a combination of active material and solid‐state electrolyte (SSE)—is at least an order of magnitude lower than that of the SSE alone because of the highly tortuous ion transport pathways in the cathode. This lowers the realizable capacity and mandates relatively thin (30–300 μm) cathodes, and hence low overall energy storage. Here, a thick (600 μm) hybrid cathode comprising vertically aligned LiNi_{0.8}Mn_{0.1}Co_{0.1}O_{2} (NMC811)‐rich channels filled with a [LiTFSI+PEGMA+MePrPyl TFSI] polymer composite electrolyte is fabricated by an innovative directional freezing and polymerization method. X‐ray micro‐computed tomography, ion mobility simulations, and DC depolarization show that the cathode structure improves Li^{+} ion diffusivity in the cathode from 4.4 × 10^{-9} to 1.4 × 10^{-7} cm^{2} s^{−1}. In a SSLMB full cell at 25 oC, the cathode provides gravimetric capacities of 199 and 120 mAh g^{−1}, and ultra‐high areal capacities of 16.7 and 10.1 mAh cm^{−2} at 0.05 and 1 C, respectively. The work demonstrates a scalable approach to realizing composite cathode structures with kinetically favorable ion transport characteristics in SSLMBs.

Type: Article
Title: A Solid-State Battery Cathode with a Polymer Composite Electrolyte and Low Tortuosity Microstructure by Directional Freezing and Polymerization
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/aenm.202002387
Publisher version: https://doi.org/10.1002/aenm.202002387
Language: English
Additional information: © 2020 The Authors. Advanced Energy Materials published by Wiley‐VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/).
Keywords: battery manufacture, cathodes, ion transport, NMC811, solid‐state batteries
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10114152
Downloads since deposit
18Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item