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Lithium cell with iron disulfide cathode

A battery and lithium salt technology, which is applied in the field of primary lithium battery cells, can solve the problems of impractical commercial use of batteries

Inactive Publication Date: 2012-01-11
THE GILLETTE CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The challenge associated with this type of battery using an electrolyte formed of a lithium salt and any combination of known organic solvents suitable for dissolving and ionizing the salt is that the problems encountered will likely be significant and thus lead to Commercial use of said battery is impractical

Method used

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  • Lithium cell with iron disulfide cathode
  • Lithium cell with iron disulfide cathode
  • Lithium cell with iron disulfide cathode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0061] has FeS 2 Experimental testing of the cathode of a lithium button cell

[0062] Experimental test Li / FeS was prepared as follows 2 Coin cell battery 100 ( Figure 1A ):

[0063] Test test battery components :

[0064] A nickel-plated steel cathode casing 130 in the shape of a coin and a nickel-plated steel anode casing (anode cover) 120 in the shape of a coin are formed by Figure 1A A similar configuration as shown in was formed. The finished battery 100 has a maximum diameter of about 25 mm and a thickness of about 3 mm. FeS in cathode casing 130 2 It weighs about 0.13 g and it covers both sides of the aluminum foil 115 . Because in this test cell 100 only the cathode side of the aluminum substrate sheet 115 facing the anode is dischargeable, the active FeS 2 The amount, that is, its actually dischargeable amount is about 0.065g. Lithium exceeds the theoretical capacity of the cathode.

[0065] In forming each cell 100, two stainless steel grids (316...

Embodiment B

[0149] Li / FeS with lithium alloy anode 2 Batteries Compared to Pure Lithium Metal Anode Batteries

[0150] Test AA size cylindrical cells were fabricated according to the foregoing description and represent specific embodiments of the invention. Three sets of batteries are tested: B, C and D. The control cell in all cases was Pack B, which had a lithium metal anode sheet 40, while Test Cells C and D both had a lithium anode sheet 40 alloyed with 1500 ppm aluminum. The electrolyte for each set of cells was the same except that sets B and C had 350ppm of water added to the electrolyte, while cell D had 425ppm of water added to the electrolyte. Otherwise, the batteries had the same contents and were prepared according to the same specifications.

[0151] The AA cells were all identical and were manufactured according to the following specifications.

[0152] Both sides of the aluminum foil substrate 65 of the cathode were coated in the form of a wet cathode slurry as pr...

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Abstract

The invention discloses a primary cell having an anode comprising lithium or lithium alloy and a cathode comprising iron disulfide (FeS2) and carbon particles. The electrolyte comprises a lithium salt preferably lithium iodide (LiI) dissolved in an organic solvent mixture. The solvent mixture preferably comprises dioxolane and dimethoxyethane. The electrolyte typically contains between about 100 and 2000 parts by weight water per million parts by weight (ppm) electrolyte therein. The anode may be lithium metal or preferably is a lithium alloy. A cathode slurry is prepared comprising iron disulfide powder, carbon, binder, and a liquid solvent. The mixture is coated onto a conductive substrate and solvent evaporated leaving a dry cathode coating on the substrate. The anode and cathode can be spirally wound with separator therebetween and inserted into the cell casing with electrolyte then added.

Description

field of invention [0001] The invention relates to a lithium primary cell having an anode, preferably composed of a lithium alloy, and a cathode, composed of iron disulfide. Background of the invention [0002] Primary (non-rechargeable) electrochemical cells with lithium anodes are known and are in wide commercial use. The anode essentially consists of lithium metal. Such cells typically have a cathode comprising manganese dioxide and a compound such as lithium trifluoromethanesulfonate (LiCF 3 SO 3 ) Lithium salt electrolyte. The battery is known in the art as a primary lithium battery (primary Li / MnO 2 batteries) and are generally not intended to be rechargeable. Alternatively, another primary lithium battery cell having a lithium metal anode but a different cathode is also known. For example, such batteries have iron disulfide (FeS 2 ) cathode and called Li / FeS 2 Battery. Iron disulfide (FeS 2 ) is also known as pyrite. Li / MnO 2 Batteries or Li / FeS 2 The bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M6/16
CPCH01M6/5072H01M6/166H01M2300/004H01M4/405H01M2300/0037H01M4/5815H01M6/164H01M6/5088
Inventor M·波津N·N·伊萨夫
Owner THE GILLETTE CO
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