Single- or Poly-Crystalline Ni-Rich Layered Cathode, Sulfide or Halide Solid Electrolyte: Which Will be the Winners for All-Solid-State Batteries?

Yoonjae Han, Sung Hoo Jung, Hiram Kwak, Seunggoo Jun, Hunho H. Kwak, Jong Hoon Lee, Seung Tae Hong, Yoon Seok Jung

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Two newly emerging materials for application in all-solid-state batteries, namely, single-crystalline Ni-rich layered oxide cathode and halide solid electrolyte (SE), are of utmost interest because of their superior properties (good microstructural integrity and excellent electrochemical oxidation stability, respectively) to conventional polycrystalline layered oxides and sulfide SEs. In this work, four electrodes employing single- or polycrystalline LiNi0.88Co0.11Al0.01O2 (NCA) and Li3YCl6 or Li6PS5Cl0.5Br0.5 are rigorously characterized by complementary analyses. It is shown that the synergy of employing cracking-free single-crystalline NCA and oxidation-tolerable Li3YCl6 can be achieved by considering intercoupled engineering factors that are prone to overlook, such as size, lightness, and mixing of particles. Accordingly, the highest level of performances in terms of discharge capacity (199 mA h g−1 at 0.1C), initial Coulombic efficiency (89.6%), cycling performance (96.8% of capacity retention at the 200th cycle), and rate capability (130 mA h g−1 at 4C) are demonstrated at 30 °C. Severe side reactions occurring at the Li6PS5Cl0.5Br0.5/NCA interfaces are also quantified and probed. Importantly, an overlooked but significant contribution of the side reaction of Li6PS5Cl0.5Br0.5 to the detrimental electrochemo-mechanical degradation of polycrystalline NCA is revealed for the first time by postmortem scanning electron microscopy and operando electrochemical pressiometry measurements.

Original languageEnglish
Article number2100126
JournalAdvanced Energy Materials
Volume11
Issue number21
DOIs
Publication statusPublished - 2021 Jun 2

Bibliographical note

Funding Information:
This work was supported by the Technology Development Program to Solve Climate Changes through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (NRF‐2017M1A2A2044501) and by Samsung Science and Technology Foundation under project no. SRFC‐MA2002‐04.

Publisher Copyright:
© 2021 Wiley-VCH GmbH

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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