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High discharge capacity lithium battery

A battery and capacity technology, applied in the field of electrochemical batteries, can solve problems affecting battery electrical characteristics and discharge characteristics, etc.

Active Publication Date: 2006-12-20
ENERGIZER BRANDS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adding other active materials to the cathode mixture may affect the electrical and discharge characteristics of the battery

Method used

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  • High discharge capacity lithium battery
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Fabricate an electrode assembly void volume of about 0.373 to about 0.455 cm per centimeter of interfacial electrode assembly height 3 FR6-type cylindrical Li / FeS with helically wound electrode assemblies varying in the range of / cm 2 Battery. Void volume is varied by adjusting the volume of voids within the active material mixture coated on the cathode. This is done by utilizing various combinations of mixture formulation, thickness and compaction. The separator material used in all cells is a highly crystalline, non-axially oriented microporous polypropylene material with a nominal thickness of 25 μm.

Embodiment 2

[0078] A battery sample of Example 1 was prepared for testing. For each set of cells with a given void volume per unit height, some cells were left undischarged and some cells were discharged 50% (the time required to discharge at a rate of 200mA to remove 50% of the rated capacity). Undischarged and 50% discharged batteries were tested in the impact test, and the external temperature of each of the tested batteries was monitored during the test and for 6 hours after the test.

[0079] For the impact test, place the sample battery on a flat surface, place a 15.8 mm diameter rod along the center of the sample, and drop a 9.1 kg mass onto the sample from a height of 61 ± 2.5 cm. The sample cell was impacted with its longitudinal axis parallel to the flat surface and perpendicular to the longitudinal axis of a 15.8 mm diameter rod placed along the center of the cell. Each sample was hit only once.

[0080] None of the undischarged batteries had an external temperature exceeding...

Embodiment 3

[0084] Four batches of FR6 cells were manufactured, each with a separator made of a different material. A description of the separator materials is provided in Table 1 and typical separator properties are summarized in Table 2, as measured by the method described below. The separator material used in Batch A was the same as that used in the Example 1 cell. Each cell contained about 1.60 g of electrolyte consisting of 9.14 wt% LiI salt in a solvent mixture including 1,3-dioxolane, 1,2-dimethoxyethane and 3, 5-Dimethylisoxazole (63.05:27.63:0.18 by weight).

[0085] Batch A

[0086] Nature (unit)

[0087] The same battery design was used for all batches A-D. The cell was designed with a larger amount of active material, higher FeS 2 Concentration and increased electrode interfacial surface area and lower anode:cathode total input capacity ratio, which resulted in a 22% increase in battery interfacial capacity.

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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 positive electrode mixture containing the iron disulfide contains highly packed solid materials, with little space around the solid particles, to provide a high concentration of iron disulfide within the mixture. The separator is thin, to allow more space within the cell for active materials, yet strong enough to prevent short circuits between the positive and negative electrodes under abusive conditions, even when swelling of the cathode during cell discharge places additional stressed on the separator. As a result, the ratio of the interfacial capacity of the positive electrode to the electrode interfacial volume is high, as is the actual capacity on low rate / low power and high rate / high power discharge.

Description

Background technique [0001] The present invention relates to electrochemical cells, especially cells with lithium negative electrodes and iron disulfide positive electrodes. [0002] Lithium batteries (batteries containing metallic lithium as the negative active material) are becoming increasingly popular as portable power sources for electronic devices with high power operation requirements. Lithium batteries for common electrical equipment include lithium / manganese dioxide (Li / MnO 2 ) and lithium / iron disulfide (Li / FeS 2 ) batteries having a nominal voltage of 3.0 and 1.5 volts per cell, respectively. [0003] Battery manufacturers are constantly striving to design batteries with higher discharge capacities. This can be achieved by reducing the internal volume of the cell taken up by the case, including seals and orifices, thereby maximizing the internal volume available to the active material. However, there is always a practical limit to the maximum internal volume. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M6/16H01M4/58H01M4/02H01M4/38H01M6/10H01M6/50H01M50/417H01M50/466H01M50/494
CPCH01M2/18H01M2/022H01M2/0225H01M2/14H01M6/10H01M4/5815H01M6/14H01M2004/028H01M2/0217H01M2006/5094H01M4/581H01M4/381H01M2/1653H01M4/02H01M6/16H01M4/40H01M50/56H01M50/107H01M50/103H01M50/417H01M50/466H01M50/494H01M4/58
Inventor J·W·马普尔
Owner ENERGIZER BRANDS
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