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Ambient‐Pressure Relithiation of Degraded Li x Ni 0.5 Co 0.2 Mn 0.3 O 2 (0 < x < 1) via Eutectic Solutions for Direct Regeneration of Lithium‐Ion Battery Cathodes

Journal Article · · Advanced Energy Materials
 [1];  [1];  [2];  [3]
  1. Department of NanoEngineering University of California San Diego La Jolla CA 92093 USA
  2. Department of NanoEngineering University of California San Diego La Jolla CA 92093 USA, Sustainable Power &, Energy Center (SPEC) University of California San Diego La Jolla CA 92093 USA
  3. Department of NanoEngineering University of California San Diego La Jolla CA 92093 USA, Sustainable Power &, Energy Center (SPEC) University of California San Diego La Jolla CA 92093 USA, Program of Chemical Engineering University of California San Diego La Jolla CA 92093 USA

Abstract

With the rapid growth of the lithium‐ion battery (LIBs) market, recycling and re‐use of end‐of‐life LIBs to reclaim lithium (Li) and transition metal (TM) resources (e.g., Co, Ni), as well as eliminating pollution from disposal of waste batteries, has become an urgent task. Here, for the first time the ambient‐pressure relithiation of degraded LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM523) cathodes via eutectic Li + molten‐salt solutions is successfully demonstrated. Combining such a low‐temperature relithiation process with a well‐designed thermal annealing step, NCM523 cathode particles with significant Li loss (≈40%) and capacity degradation (≈50%) can be successfully regenerated to achieve their original composition and crystal structures, leading to effective recovery of their capacity, cycling stability, and rate capability to the levels of the pristine materials. Advanced characterization tools including atomic resolution electron microscopy imaging and electron energy loss spectroscopy are combined to demonstrate that NCM523's original layered crystal structure is recovered. For the first time, it is shown that layer‐to‐rock salt phase change on the surfaces and subsurfaces of the cathode materials can be reversed if lithium can be incorporated back to the material. The result suggests the great promise of using eutectic Li + molten–salt solutions for ambient‐pressure relithiation to recycle and remanufacture degraded LIB cathode materials.

Sponsoring Organization:
USDOE
OSTI ID:
1505652
Alternate ID(s):
OSTI ID: 23098857
Journal Information:
Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 20 Vol. 9; ISSN 1614-6832
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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