Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Operando identification of the point of [Mn-2]O-4 spinel formation during gamma-MnO2 discharge within batteries

Journal Article · · Journal of Power Sources
 [1];  [2];  [3];  [4];  [1];  [1];  [2];  [3];  [1]
  1. City College of New York, NY (United States)
  2. Princeton Univ., NJ (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Rutgers Univ., Piscataway, NJ (United States)

The rechargeability of γ-MnO2 cathodes in alkaline batteries is limited by the formation of the [Mn2]O4 spinels ZnMn2O4 (hetaerolite) and Mn3O4 (hausmannite). However, the time and formation mechanisms of these spinels are not well understood. Here we directly observe γ-MnO2 discharge at a range of reaction extents distributed across a thick porous electrode. Coupled with a battery model, this reveals that spinel formation occurs at a precise and predictable point in the reaction, regardless of reaction rate. Observation is accomplished by energy dispersive X-ray diffraction (EDXRD) using photons of high energy and high flux, which penetrate the cell and provide diffraction data as a function of location and time. After insertion of 0.79 protons per γ-MnO2 the α-MnOOH phase forms rapidly. α-MnOOH is the precursor to spinel, which closely follows. ZnMn2O4 and Mn3O4 form at the same discharge depth, by the same mechanism. The results show the final discharge product, Mn3O4 or Mn(OH)2, is not an intrinsic property of γ-MnO2. While several studies have identified Mn(OH)2 as the final γ-MnO2 discharge product, we observe direct conversion to Mn3O4 with no Mn(OH)2.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI ID:
1340423
Alternate ID(s):
OSTI ID: 1341186
OSTI ID: 1354463
Report Number(s):
BNL--113337-2016-JA
Journal Information:
Journal of Power Sources, Journal Name: Journal of Power Sources Vol. 321; ISSN 0378-7753
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (30)

Porous-electrode theory with battery applications journal January 1975
The Structure of Fully H-Inserted γ-Manganese Dioxide Compounds journal April 1996
Hydrogen Bonding and Jahn–Teller Distortion in Groutite,α-MnOOH, and Manganite,γ-MnOOH, and Their Relations to the Manganese Dioxides Ramsdellite and Pyrolusite journal November 1997
The electrochemistry of β-MnO2 and γ-MnO2 in alkaline electrolyte journal March 1975
Ramsdellite-MnO2 for lithium batteries: the ramsdellite to spinel transformation journal June 1993
Lithium insertion into βMnO2 and the rutile-spinel transformation journal January 1984
Structural and electrochemical properties of the proton / γ-MnO2 system journal January 1995
Structural effects on the cyclability of the alkaline γ-MnO2 electrode journal May 2011
In situ X-ray diffraction of prototype sodium metal halide cells: Time and space electrochemical profiling journal February 2011
Rechargeability and economic aspects of alkaline zinc–manganese dioxide cells for electrical storage and load leveling journal February 2015
2 H MAS NMR Studies of the Manganese Dioxide Tunnel Structures and Hydroxides Used as Cathode Materials in Primary Batteries journal September 2001
Real-time materials evolution visualized within intact cycling alkaline batteries journal January 2014
Electrochemical reduction of Ag 2 VP 2 O 8 composite electrodes visualized via in situ energy dispersive X-ray diffraction (EDXRD): unexpected conductive additive effects journal January 2015
Strain field and scattered intensity profiling with energy dispersive x-ray scattering journal July 2002
In situ strain profiling of elastoplastic bending in Ti–6Al–4V alloy by synchrotron energy dispersive x-ray diffraction journal May 2009
Structural study of proton electrochemical intercalation in manganese dioxide journal April 1991
In situ visualization of Li/Ag2VP2O8 batteries revealing rate-dependent discharge mechanism journal January 2015
Understanding the Second Electron Discharge Plateau in MnO[sub 2]-Based Alkaline Cells journal January 2001
Manganese(III) Chemistry in KOH Solutions in the Presence of Bi- or Ba-Containing Compounds and Its Implications on the Rechargeability of γ-MnO[sub 2] in Alkaline Cells journal January 2003
[sup 2]H MAS NMR and SPECS Studies of γ-MnO[sub 2] Reduction in Zinc Alkaline Primary Batteries journal January 2004
Rechargeability of MnO[sub 2] in KOH Media Produced by Decomposition of Dissolved KMnO[sub 4] and Bi(NO[sub 3])[sub 3] Mixtures journal January 1997
Rechargeable Alkaline Manganese Dioxide Batteries journal January 1992
Mathematical Modeling of the Lithium‐Aluminum, Iron Sulfide Battery: II . The Influence of Relaxation Time on the Charging Characteristics journal March 1981
Modeling of Cylindrical Alkaline Cells journal January 1993
Cathodic Polarization of the Manganese Dioxide Electrode in Alkaline Electrolytes journal January 1968
The Cathodic Reduction Mechanism of Electrolytic Manganese Dioxide in Alkaline Electrolyte journal January 1965
The Manganese Dioxide Electrode in Alkaline Electrolyte; The Electron-Proton Mechanism for the Discharge Process from MnO[sub 2] to MnO[sub 1.5] journal January 1966
The Alkaline Manganese Dioxide Electrode journal January 1967
Hetaerolite Profiles in Alkaline Batteries Measured by High Energy EDXRD journal November 2014
Manganese Dioxides: Structural Model and In-Situ Neutron Powder Diffraction Investigation of Thermal Annealing and Electrochemical Reduction journal January 1990

Cited By (4)

Recent Advances in Rational Electrode Designs for High-Performance Alkaline Rechargeable Batteries journal January 2019
Electrode Composite for Flexible Zinc–Manganese Dioxide Batteries through In Situ Polymerization of Polymer Hydrogel journal December 2019
Systematic cycle life assessment of a secondary zinc-air battery as a function of the alkaline electrolyte composition journal May 2018
An Operando Study of the Initial Discharge of Bi and Bi/Cu Modified MnO 2 journal January 2018

Similar Records

Synthesis and stability of hetaerolite, ZnMn/sub 2/O/sub 4/, at 25/sup 0/C
Journal Article · Mon Jun 01 00:00:00 EDT 1987 · Geochim. Cosmochim. Acta; (United States) · OSTI ID:6938644

Formation and conversion mechanisms between single-crystal gamma-MnOOH and manganese oxides
Journal Article · Sun Jul 15 00:00:00 EDT 2012 · Materials Research Bulletin · OSTI ID:22215147

Related Subjects