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Self-smoothing anode for achieving high-energy lithium metal batteries under realistic conditions

Self-smoothing anode for achieving high-energy lithium metal batteries under realistic conditions Despite considerable efforts to stabilize lithium metal anode structures and prevent dendrite formation, achieving long cycling life in high-energy batteries under realistic conditions remains extremely difficult due to a combination of complex failure modes that involve accelerated anode degradation and the depletion of electrolyte and lithium metal. Here we report a self-smoothing lithium–carbon anode structure based on mesoporous carbon nanofibres, which, coupled with a lithium nickel–manganese–cobalt oxide cathode with a high nickel content, can lead to a cell-level energy density of 350–380 Wh kg−1 (counting all the active and inactive components) and a stable cycling life up to 200 cycles. These performances are achieved under the realistic conditions required for practical high-energy rechargeable lithium metal batteries: cathode loading ≥4.0 mAh cm−2, negative to positive electrode capacity ratio ≤2 and electrolyte weight to cathode capacity ratio ≤3 g Ah−1. The high stability of our anode is due to the amine functionalization and the mesoporous carbon structures that favour smooth lithium deposition. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nature Nanotechnology Springer Journals

Self-smoothing anode for achieving high-energy lithium metal batteries under realistic conditions

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References (56)

Publisher
Springer Journals
Copyright
Copyright © 2019 by The Author(s), under exclusive licence to Springer Nature Limited
Subject
Materials Science; Materials Science, general; Nanotechnology; Nanotechnology and Microengineering
ISSN
1748-3387
eISSN
1748-3395
DOI
10.1038/s41565-019-0427-9
Publisher site
See Article on Publisher Site

Abstract

Despite considerable efforts to stabilize lithium metal anode structures and prevent dendrite formation, achieving long cycling life in high-energy batteries under realistic conditions remains extremely difficult due to a combination of complex failure modes that involve accelerated anode degradation and the depletion of electrolyte and lithium metal. Here we report a self-smoothing lithium–carbon anode structure based on mesoporous carbon nanofibres, which, coupled with a lithium nickel–manganese–cobalt oxide cathode with a high nickel content, can lead to a cell-level energy density of 350–380 Wh kg−1 (counting all the active and inactive components) and a stable cycling life up to 200 cycles. These performances are achieved under the realistic conditions required for practical high-energy rechargeable lithium metal batteries: cathode loading ≥4.0 mAh cm−2, negative to positive electrode capacity ratio ≤2 and electrolyte weight to cathode capacity ratio ≤3 g Ah−1. The high stability of our anode is due to the amine functionalization and the mesoporous carbon structures that favour smooth lithium deposition.

Journal

Nature Nanotechnology – Springer Journals

Published: Apr 29, 2019

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