a lithium battery

A lithium battery and electrolyte technology, applied in the direction of battery electrodes, secondary batteries, battery pack components, etc., to achieve the effect of improving the contact surface area, low initial open circuit voltage, and solving the problem of resistance deterioration

Active Publication Date: 2022-07-08
SHENZHEN JERAMIC MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the lithium-manganese batteries manufactured by the prior art cannot meet the application of wider temperature requirements. For example, the lithium battery used as the power supply of the automobile tire pressure monitoring system needs to work at a temperature of 100 ° C or higher for a certain period of time, and at the same time at a low temperature of -40 ° C must also be able to discharge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Preparation of Lithium Manganese Oxide:

[0055] (0) Purification of EMD

[0056] Take 8kg of electrolytic manganese dioxide and add it to 20L of deionized water, keep stirring, slowly add HCl solution with a concentration of 1M until pH=1, keep stirring at room temperature for 24 hours, let stand, remove the supernatant, filter with suction, and then add Deionized water was suction filtered for four times until the pH of the filtrate reached 6, and a filter cake was obtained, which was divided into four uniform portions.

[0057] (1) Preparation method of wet lithium manganese oxide:

[0058] Take four parts of EMD filter cakes of electrolytic manganese dioxide and place them in four parts of 2L deionized water, respectively, to quickly stir to make a suspension, and the stirring time is at least 20 minutes; ·H 2 0), until the pH of the four suspensions increased to 7.5, and continued stirring for at least 30 minutes; one of the suspensions was set aside and continu...

Embodiment 2

[0064] Button battery production

[0065] (1) Positive electrode active material: samples a, b, c, d, e, f, g, and h in Example 1.

[0066] (2) Positive electrode sheet

[0067] The mass ratio of the positive electrode mixture is shown in Table 1.

[0068] Table 1

[0069]

[0070] The positive electrode mixture was thoroughly mixed and pressed into a disk with a diameter of 15.5 mm and a thickness of 1.5 mm, and then vacuum-dried at 200° C. for 12 hours. A carbon-coated nickel foil with a thickness of 12 μm (the average thickness of the conductive carbon layer is 4 μm) was cut into a circle with a diameter of 16.5, which was laid on the inner flat surface of the positive electrode shell as a positive electrode current collector.

[0071] (3) Negative pole

[0072] A LiAl (Al content: 0.8 wt.%) alloy sheet was pressed onto the flat surface of the negative electrode shell.

[0073] (4) Conductive layer

[0074] The thickness is 0.19mm, the material is PAN-based carbon ...

Embodiment 3

[0091] The difference between the button battery in this embodiment and Embodiment 2 is only the difference in the positive electrode active material in (1). In this embodiment, the positive electrode active material is a mixture of lithium manganese oxide material and graphite fluoride.

[0092] The active material lithium manganese oxide sample c and (CF 1.08 ) n According to the mass ratio of 95:5, the ingredients are ball-milled for 4 hours to obtain the positive electrode active material sample C. In the present embodiment, the battery made by material sample C is marked as battery I, and the discharge test results are shown in Figure 4 .

[0093] Figure 4 It is shown that the lithium manganese oxide material and the graphite fluoride have a good synergistic effect, and there is a low voltage warning level at the end of the battery discharge.

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Abstract

The invention discloses a lithium battery, comprising a positive electrode, a lithium metal or lithium alloy negative electrode, an anhydrous electrolyte and a diaphragm; a conductive layer is arranged between the diaphragm and the negative electrode, and the conductive layer contains materials with conductive properties; the The positive electrode includes at least one of irreversible γ-type lithium manganese oxide and doped lithium manganese oxide and a carbon fluoride material. The present invention aims to provide a lithium-manganese battery that can work in an environment higher than 100° C. and maintain high-current discharge capability at a low temperature-40° C. The positive electrode material of the lithium battery is made of γ-type lithium manganese oxide and carbon fluoride. The combination has a life-warning feature, and the positive electrode has a suppressed activity of reacting with the electrolyte at high temperatures. The conductive layer arranged between the separator and the lithium metal negative electrode solves the problem of the deterioration of the interface resistance on the surface of the lithium metal battery at high temperature.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium battery. Background technique [0002] In recent years, electronic devices using lithium batteries as power sources have been more and more widely used, especially lithium-manganese batteries using manganese oxide for the positive electrode, lithium metal or lithium alloy for the negative electrode, and anhydrous electrolyte for the electrolyte in consumer electronics and It is widely used in industrial electronic products and is the most common type of lithium battery. Lithium-manganese batteries are divided into lithium-manganese primary batteries that can only be discharged once and secondary lithium-manganese batteries that can be charged and discharged multiple times. [0003] Generally, the operating temperature range of the lithium-manganese battery manufactured in the prior art is -20 to +80°C. Its structure includes a manganese dioxide positive elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/62H01M50/46H01M10/0525
CPCH01M4/505H01M4/628H01M4/624H01M4/625H01M10/0525H01M2004/028H01M2004/021Y02P70/50
Inventor 刘秦
Owner SHENZHEN JERAMIC MATERIALS TECH CO LTD
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