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Title: Anomalous metal segregation in lithium-rich material provides design rules for stable cathode in lithium-ion battery

Journal Article · · Nature Communications
 [1]; ORCiD logo [2];  [1];  [3];  [4];  [5]; ORCiD logo [6]; ORCiD logo [1];  [2];  [1];  [7]; ORCiD logo [5]; ORCiD logo [8]; ORCiD logo [3];  [2]; ORCiD logo [9]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Chemistry Division
  3. Chinese Academy of Sciences (CAS), Beijing (China). Beijing Advanced Innovation Center for Materials Genome Engineering, Inst. of Physics
  4. Xiamen Univ., Xiamen (China). Dept. of Physics and the Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  6. Xiamen Univ., Xiamen (China). Dept. of Physics and the Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices; Xiamen Univ. Malaysia, Selangor (Malaysia)
  7. Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
  8. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Energy Storage and Distributed Resources Division; Univ. of California, Berkeley, CA (United States). Dept. of Materials Science
  9. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN); Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy

Despite the importance of studying the instability of delithiated cathode materials, it remains difficult to underpin the degradation mechanism of lithium-rich cathode materials due to the complication of combined chemical and structural evolutions. Herein, we use state-of-the-art electron microscopy tools, in conjunction with synchrotron X-ray techniques and first-principle calculations to study a 4d-element-containing compound, Li2Ru0.5Mn0.5O3. We find surprisingly, after cycling, ruthenium segregates out as metallic nanoclusters on the reconstructed surface. Our calculations show that the unexpected ruthenium metal segregation is due to its thermodynamic insolubility in the oxygen deprived surface. This insolubility can disrupt the reconstructed surface, which explains the formation of a porous structure in this material. This work reveals the importance of studying the thermodynamic stability of the reconstructed film on the cathode materials and offers a theoretical guidance for choosing manganese substituting elements in lithium-rich as well as stoichiometric layer-layer compounds for stabilizing the cathode surface.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Grant/Contract Number:
AC02-05CH11231; SC0012704
OSTI ID:
1542396
Alternate ID(s):
OSTI ID: 1507699
Report Number(s):
BNL-211556-2019-JAAM; ark:/13030/qt9p5140p2
Journal Information:
Nature Communications, Vol. 10, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 53 works
Citation information provided by
Web of Science

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Highly [010]-oriented, gradient Co-doped LiMnPO4 with enhanced cycling stability as cathode for Li-ion batteries journal January 2020
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