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Title: Potassium Prussian blue-coated Li-rich cathode with enhanced lithium ion storage property

Journal Article · · Nano Energy
 [1];  [2];  [3];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [4]
  1. Shandong Univ., Jinan (China). Research Center for Carbon Nanomaterials, Key Lab. for Liquid-Solid Structural Evolution & Processing of Materials
  2. Shandong Univ., Jinan (China). Research Center for Carbon Nanomaterials, Key Lab. for Liquid-Solid Structural Evolution & Processing of Materials; Harbin Inst. of Technology, Shenzhen (China)
  3. Univ. of Illinois, Chicago, IL (United States); Argonne National Lab. (ANL), Lemont, IL (United States)
  4. Argonne National Lab. (ANL), Lemont, IL (United States)
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With high specific capacity, the layered Li-rich Mn-based oxide (LRMO) is a promising candidate cathode material for Li-ion batteries. However, the irreversible release of Li-ions during the first charging process, instability of LRMO/electrolyte interface and relatively low ion conductivity of LRMO result in low initial Coulombic efficiency (ICE), poor cycle stability and rate performance, which prohibit its further application. Furthermore, interface engineering via additive coating is expected to effectively address these issues. Herein, we rely on potassium Prussian blue (KPB), a Li+ acceptor with good ion conductivity, as a new coating material on LRMO particles. The KPB coating not only forms a protective layer on the surface of LRMO against electrolyte corrosion, but also functions as a host for Li+ transport and accommodation, leading to enhanced ion conductivity and ICE of LRMO cathode. Consequently, 2 wt% KPB coated LRMO cathode achieved an initial discharge capacity of up to 281.7 mA h g-1 with an ICE of 85.69% compared to an ICE of 79.52% for the LRMO cathode without coating. The cycling and rate performance are also greatly improved as evidenced by the well maintained capacity of up to 176.8 mA h g-1 after 100 cycles at a current density of 0.5 C, compared to the limited capacity of only 135.3 mA h g-1 for the LRMO cathode without coating. Overall, this work pioneers the use of potassium Prussian blue as additive coating material to enhance performance of LRMO cathode, and we expect it to inspire the battery community with new strategies of material engineering/design toward practical application in high-energy lithium-ion batteries.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Vehicle Technologies (VTO); USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1756761
Alternate ID(s):
OSTI ID: 1632967
Journal Information:
Nano Energy, Vol. 75; ISSN 2211-2855
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 40 works
Citation information provided by
Web of Science

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Related Subjects

25 ENERGY STORAGE
Electrochemical performance
Layered Li-rich Mn-based oxide (LRMO)
Potassium Prussian blue
Structural stability
Surface modification