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High discharge capacity lithium battery

A battery and electrolyte technology, applied in the field of electrochemical batteries, can solve problems such as substrate deformation, material degradation, and failure

Active Publication Date: 2007-12-12
ENERGIZER BRANDS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, during storage, the above-mentioned oxidation and weathering occur and the material deteriorates
In addition, large iron disulfide particle size may affect processes such as calendering, resulting in substrate deformation, coating-substrate bond failure, and failure due to separator damage

Method used

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  • High discharge capacity lithium battery
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] FR6-Type Cylindrical Li / FeS with Helically Wound Electrode Assembly 2 The battery is at about 0.373-about 0.455cm 3 The electrode assembly void volume per cm interface electrode assembly height in the range of 1 / cm was made. Void volume is varied by adjusting the volume of voids within the active material mixture coated on the cathode. This is accomplished through various combinations of mixture formulation, thickness and assembly. The separator material used in all cells was a highly crystalline, uniaxially oriented microporous polypropylene material with a nominal thickness of 25 μm.

Embodiment 2

[0086] A sample of the battery of Example 1 was prepared for testing. For each group with a given void volume per unit height, some cells were left undischarged, while some cells were discharged 50% (at 200mA rate for the time required to remove 50% of the rated capacity). Tests related to the shock test were performed on undischarged and 50% discharged cells, monitoring the ambient temperature of each cell tested during the test and for 6 hours after the test.

[0087] For impact testing, the sample cell is placed on a flat surface, a 15.8 mm diameter rod is placed across the center of the sample, and a 9.1 kg object is dropped onto the sample from a height of 61 ± 2.5 cm. Sample cells were impacted with their longitudinal axis parallel to the flat surface and perpendicular to the longitudinal axis of a 15.8 mm diameter rod spanning the center of the cell. Each sample is subjected to only one impact.

[0088] The ambient temperature of the undischarged batteries did not exc...

Embodiment 3

[0091] Four batches of FR6 cells were manufactured, each batch having a separator made of a different material. A description of the separator materials is provided in Table 1 and typical separator properties, as determined by the method described below, are summarized in Table 2. The separator material used for Batch A was the same as that used for the cells in Example 1. Each cell contains about 1.60 g of electrolyte composed of 1,3-dioxolane, 1,2-dimethoxyethane and 3,5-dimethylisoxazole (63.05:27.63:0.18 , by weight) of 9.14 wt% LiI salt composition in the solvent blend.

Table 1

Batch A

Batch B

Batch C

[0092] For all batches A-D, the same cell design was used. This cell design is one that has a larger amount of active material, a higher concentration of FeS in the cathode mixture than the cell of Example 1 (with an electrode assembly void volume to interfacial height ratio of about 0.452) 2 And a design with a higher electrode interfacial surface ...

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Abstract

A lithium / iron disulfide electrochemical battery cell with a high discharge capacity. The cell has a lithium negative electrode, an iron disulfide positive electrode and a nonaqueous electrolyte. The iron disulfide of the positive electrode has a controlled average particle size range which allows the electrochemical cells to exhibit desired properties in both low and high rate applications. In various embodiments, the iron disulfide particles are wet milled, preferably utilizing a media mill or milled utilizing a non-mechanical mill such as a jet mill, which reduces the iron disulfide particles to a desired average particle size range for incorporation into the positive electrode.

Description

technical field [0001] The present invention relates to electrochemical cells, especially cells with lithium negative electrodes and iron disulfide positive electrodes. In one embodiment, the positive electrode includes iron disulfide particles having a specific small average particle size, which enables the electrochemical cell to exhibit desirable performance for both low-load and high-load applications. The iron disulfide particles are formed by a wet or dry process, which reduces the particle size to a predetermined size range. In a preferred method of the invention, a media mill is used to grind the iron disulfide particle-containing cathode slurry, which reduces the iron disulfide particles to an average particle size desired for incorporation into the positive electrode. In a more preferred embodiment, jet milling is used to treat the iron disulfide particles prior to incorporation into the positive electrode. Background of the invention [0002] Lithium batteries (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/02H01M4/04H01M4/38H01M4/58H01M4/62H01M6/10H01M6/16H01M6/50H01M10/04H01M50/417H01M50/463H01M50/489
CPCH01M4/0419H01M2/18H01M2/022H01M4/12H01M6/10H01M4/381H01M4/5815H01M4/04H01M2004/028H01M4/0404H01M2/0217H01M2004/021H01M2006/5094H01M4/581H01M4/62H01M2/1653H01M6/16H01M50/107H01M50/103H01M50/463Y02P70/50H01M50/417H01M50/489H01M4/06H01M6/164H01M6/166H01M6/50Y02E60/10
Inventor J·W·马普尔M·W·温普尔
Owner ENERGIZER BRANDS
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