4.8 Article

Integrated Structure of Cathode and Double-Layer Electrolyte for Highly Stable and Dendrite-Free All-Solid-State Li-Metal Batteries

Journal

ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 51, Pages 56995-57002

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c16390

Keywords

all-solid-state battery; Li1.4Al0.4Ti1.6 (PO4)(3); polyethylene oxide; double layer solid electrolyte; integrated structure; lithium metal

Funding

  1. Key-Area Research and Development Program of Guangdong Province [2020B090919001]
  2. National Natural Science Foundation of China [U2001220, 51672156]
  3. Guangdong Basic and Applied Basic Research Foundation [2019A1515110446]
  4. Shenzhen Technical Plan Project [JCYJ20180508152135822, JCYJ20180508152210821, JCYJ20170412170706047]
  5. China Postdoctoral Science Foundation [2019M660035]
  6. Shenzhen All-Solid-State Lithium Battery Electrolyte Engineering Research Center
  7. Shenzhen Geim Graphene Center

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All-solid-state batteries have become the most potential next-generation energy-storage devices. However, it is quite difficult to simultaneously achieve a single solid-state electrolytes (SSEs) layer with both dendrite-free Li metal plating and low interfacial resistance between the cathode and SSEs. Herein, an integrated structure of cathode and double-layer solid electrolyte membrane (IS-CDL) is designed, which greatly improves the interfacial contact and suppresses the Li dendrite growth. The first polymer in ceramic solid electrolyte layer (SL1) consists of 80 wt % Li1.4Al0.4Ti1.6 (PO4)(3) (LATP) nanoparticles and 20 wt % polyethylene oxide (PEO), and the second polymer electrolyte layer is PEO-based solid electrolyte layer (SL2). The SL1 with high mechanical properties can hinder the growth of Li dendrites and reduce the interfacial resistance with the cathode. The SL2 can inhibit the side reaction between the Li metal and LATP. The Li symmetric cells with sandwich-type hierarchical electrolyte (SL2/SL1/SL2) can stably cycle over 3200 h at 0.1 mA cm(-2) at 45 degrees C. The obtained all-solid-state LiFePO4-IS-CDL/Li batteries present a capacity of 142.6 mA h g(-1) at 45 degrees C with the capacity retention of 91.7% after 100 cycles, and all-solid-state NCM811-IS-CDL/Li batteries deliver a specific capacity of 175.5 mA h g(-4) at 60 degrees C. This work proposes an effective strategy to fabricate all-solid-state lithium batteries with high electrochemical performance.

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