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Boron Nitride Enhanced Garnet-Type (Li6.25Al0.25La3Zr2O12) Ceramic Electrolyte for an All-Solid-State Lithium-Ion Battery

Zhang, Z; Gonzalez, AR; Choy, KL; (2019) Boron Nitride Enhanced Garnet-Type (Li6.25Al0.25La3Zr2O12) Ceramic Electrolyte for an All-Solid-State Lithium-Ion Battery. ACS Applied Energy Materials , 2 (10) pp. 7438-7448. 10.1021/acsaem.9b01431. Green open access

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Abstract

Solid-state electrolytes (SSEs) are expected to improve not only the safety but also the energy density of lithium-ion batteries, especially referring to the application of most promising Li metal anode which encounters deleterious dendritic growth. The key challenge for the SSEs is the pursuit of higher ionic conductivity, higher mechanical strength, and better chemical and electrochemical stability. Herein, for the first time, hexagonal boron nitride (BN) is employed as the effective additive for garnet-type Li6.25Al0.25La3Zr2O12 (LALZO) SSE during sintering, which induces comprehensively improved properties. Compared with the LALZO electrolyte without BN, a small percentage of 1 wt % BN added to the LALZO electrolyte exhibits 30 times higher ionic conductivity (6.21 × 10–5 S cm–1), 6.6 times higher surface hardness (∼0.5 GPa), and 6.3 times higher reduced modulus (5.6 GPa), much improved chemical stability against air (anti-Li2CO3), and electrochemical stability during lithium stripping/plating at different current densities. As a result, the all-solid-state lithium-ion battery composed of lithium metal anode and LiCoO2 cathode with the 1 wt % BN enhanced LALZO electrolyte delivers a discharge capacity of 120 mA h g–1 and a much higher capacity retention (67% vs 33%) after 50 cycles at a rate of 0.1C than that without BN addition. This BN enhanced garnet-type ceramic electrolyte may provide a facile and efficient approach to further promote the solid-state electrolyte for next-generation high performance energy storage devices.

Type: Article
Title: Boron Nitride Enhanced Garnet-Type (Li6.25Al0.25La3Zr2O12) Ceramic Electrolyte for an All-Solid-State Lithium-Ion Battery
Open access status: An open access version is available from UCL Discovery
DOI: 10.1021/acsaem.9b01431
Publisher version: https://doi.org/10.1021/acsaem.9b01431
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Solid-state electrolyte, garnet, boron nitride, ionic conductivity, mechanical property, lithium-ion battery
UCL classification: UCL
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 Chemical Engineering
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office > Institute for Materials Discovery
URI: https://discovery.ucl.ac.uk/id/eprint/10084390
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