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Stoichiometric Layered Potassium Transition Metal Oxide for Rechargeable Potassium Batteries

Journal Article · · Chemistry of Materials
 [1];  [2];  [2];  [2];  [2];  [3];  [2];  [2];  [2];  [4]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Univ. of California, Berkeley, CA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of Michigan−Shanghai Jiao Tong Univ. Joint Inst., Shanghai (China)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
+ Show Author Affiliations
K-ion batteries are promising alternative energy storage systems for large-scale applications because of the globally abundant K reserves. K-ion batteries benefit from the lower standard redox potential of K/K+ than that of Na/Na+ and even Li/Li+, which can translate into a higher working voltage. Stable KC8 can also be formed via K intercalation into a graphite anode, which contrasts with the thermodynamically unfavorable Na intercalation into graphite, making graphite a readily available anode for K-ion battery technology. However, to construct practical rocking-chair K-ion batteries, an appropriate cathode material that can accommodate reversible K release and storage is still needed. We show that stoichiometric KCrO2 with a layered O3-type structure can function as a cathode for K-ion batteries and demonstrate a practical rocking-chair K-ion battery. In situ X-ray diffraction and electrochemical titration demonstrate that KxCrO2 is stable for a wide K content, allowing for topotactic K extraction and reinsertion. We further explain why stoichiometric KCrO2 is unique in forming the layered structure unlike other stoichiometric K-transition metal oxide compounds, which form nonlayered structures; this fundamental understanding provides insight for the future design of other layered cathodes for K-ion batteries.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1542320
Journal Information:
Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 18 Vol. 30; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (11)

Investigation of Alkali‐Ion (Li, Na, and K) Intercalation in K x VPO 4 F ( x ∼ 0) Cathode journal June 2019
Advancements and Challenges in Potassium Ion Batteries: A Comprehensive Review journal January 2020
Birnessite Nanosheet Arrays with High K Content as a High‐Capacity and Ultrastable Cathode for K‐Ion Batteries journal May 2019
Structural Insight into Layer Gliding and Lattice Distortion in Layered Manganese Oxide Electrodes for Potassium‐Ion Batteries journal June 2019
Sulfonylamide‐Based Ionic Liquids for High‐Voltage Potassium‐Ion Batteries with Honeycomb Layered Cathode Oxides journal May 2019
Review on Recent Advances of Cathode Materials for Potassium‐ion Batteries journal March 2020
Prepotassiated V 2 O 5 as the Cathode Material for High‐Voltage Potassium‐Ion Batteries journal September 2019
Lab‐Scale In Situ X‐Ray Diffraction Technique for Different Battery Systems: Designs, Applications, and Perspectives journal May 2019
KFeO2 with corner-shared FeO4 frameworks as a new type of cathode material in potassium-ion batteries journal October 2019
Enhanced K-ion kinetics in a layered cathode for potassium ion batteries journal January 2019
Emerging polyanionic and organic compounds for high energy density, non-aqueous potassium-ion batteries journal January 2020

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