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Title: Secondary cell with orthorhombic alkali metal/manganese oxide phase active cathode material

Abstract

An alkali metal manganese oxide secondary cell is disclosed which can provide a high rate of discharge, good cycling capabilities, good stability of the cathode material, high specific energy (energy per unit of weight) and high energy density (energy per unit volume). The active material in the anode is an alkali metal and the active material in the cathode comprises an orthorhombic alkali metal manganese oxide which undergoes intercalation and deintercalation without a change in phase, resulting in a substantially linear change in voltage with change in the state of charge of the cell. The active material in the cathode is an orthorhombic structure having the formula M{sub x}Z{sub y}Mn{sub (1{minus}y)}O{sub 2}, where M is an alkali metal; Z is a metal capable of substituting for manganese in the orthorhombic structure such as iron, cobalt or titanium; x ranges from about 0.2 in the fully charged state to about 0.75 in the fully discharged state, and y ranges from 0 to 60 atomic %. Preferably, the cell is constructed with a solid electrolyte, but a liquid or gelatinous electrolyte may also be used in the cell. 11 figs.

Inventors:
; ; ; ;
Publication Date:
Research Org.:
University of California
OSTI Identifier:
378134
Patent Number(s):
US 5,558,961/A/
Application Number:
PAN: 8-259,658
Assignee:
Univ. of California, Oakland, CA (United States) PTO; SCA: 250903; PA: EDB-96:149318; SN: 96001666717
DOE Contract Number:
AC03-76SF00098
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 24 Sep 1996
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; METAL-METAL OXIDE BATTERIES; CATHODES; MANGANESE OXIDES; PERFORMANCE; ALKALI METALS; BATTERY CHARGE STATE; ELECTROLYTES

Citation Formats

Doeff, M.M., Peng, M.Y., Ma, Y., Visco, S.J., and DeJonghe, L.C. Secondary cell with orthorhombic alkali metal/manganese oxide phase active cathode material. United States: N. p., 1996. Web.
Doeff, M.M., Peng, M.Y., Ma, Y., Visco, S.J., & DeJonghe, L.C. Secondary cell with orthorhombic alkali metal/manganese oxide phase active cathode material. United States.
Doeff, M.M., Peng, M.Y., Ma, Y., Visco, S.J., and DeJonghe, L.C. 1996. "Secondary cell with orthorhombic alkali metal/manganese oxide phase active cathode material". United States. doi:.
@article{osti_378134,
title = {Secondary cell with orthorhombic alkali metal/manganese oxide phase active cathode material},
author = {Doeff, M.M. and Peng, M.Y. and Ma, Y. and Visco, S.J. and DeJonghe, L.C.},
abstractNote = {An alkali metal manganese oxide secondary cell is disclosed which can provide a high rate of discharge, good cycling capabilities, good stability of the cathode material, high specific energy (energy per unit of weight) and high energy density (energy per unit volume). The active material in the anode is an alkali metal and the active material in the cathode comprises an orthorhombic alkali metal manganese oxide which undergoes intercalation and deintercalation without a change in phase, resulting in a substantially linear change in voltage with change in the state of charge of the cell. The active material in the cathode is an orthorhombic structure having the formula M{sub x}Z{sub y}Mn{sub (1{minus}y)}O{sub 2}, where M is an alkali metal; Z is a metal capable of substituting for manganese in the orthorhombic structure such as iron, cobalt or titanium; x ranges from about 0.2 in the fully charged state to about 0.75 in the fully discharged state, and y ranges from 0 to 60 atomic %. Preferably, the cell is constructed with a solid electrolyte, but a liquid or gelatinous electrolyte may also be used in the cell. 11 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1996,
month = 9
}
  • An alkali metal manganese oxide secondary cell is disclosed which can provide a high rate of discharge, good cycling capabilities, good stability of the cathode material, high specific energy (energy per unit of weight) and high energy density (energy per unit volume). The active material in the anode is an alkali metal and the active material in the cathode comprises an orthorhombic alkali metal manganese oxide which undergoes intercalation and deintercalation without a change in phase, resulting in a substantially linear change in voltage with change in the state of charge of the cell. The active material in the cathodemore » is an orthorhombic structure having the formula M.sub.x Z.sub.y Mn.sub.(1-y) O.sub.2, where M is an alkali metal; Z is a metal capable of substituting for manganese in the orthorhombic structure such as iron, cobalt or titanium; x ranges from about 0.2 in the fully charged state to about 0.75 in the fully discharged state, and y ranges from 0 to 60 atomic %. Preferably, the cell is constructed with a solid electrolyte, but a liquid or gelatinous electrolyte may also be used in the cell.« less
  • In an electrochemical cell the negative active material is an alkali or alkaline earth metal, such as lithium, and the electrolyte comprises a solute and at least one solvent selected from the liquid oxyhalides and which serves also as the positive active material. The electrolyte further comprises a mineral substance the effect of which is to significantly reduce the voltage rise delay of the cell.
  • A primary cell of high specific energy in which the anode active material is an alkali metal and the cathode active material is sulphur oxychloride which simultaneously acts as an electrolyte solvent, said electrolyte further containing a dissolved salt and a co-solvent. The co-solvent is chosen from among phosphoryl chloride and benzoyl chloride; the dissolved salt is lithium tetrachloroaluminate.
  • A novel electrochemical cell is disclosed which contains an alkali metal anode, an electrolyte and a chalcogenide cathode wherein the electrolyte is a solid composition containing an electrolytically active amount of one or more compounds having the formula: axbyc2 wherein a is an alkali metal, wherein B is an element selected from the group consisting of boron and aluminum, wherein C is a chalcogen, wherein x and y are each greater than zero and wherein x+3y=4. A preferred compound is LiBS/sub 2/. A preferred cell is one having a lithium-containing anode, a titanium disulfide cathodeactive material cathode and the mentionedmore » electrolyte compound.« less