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Non-aqueous electrolyte lithium ion secondary cell

A non-aqueous electrolyte, secondary battery technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as increased production costs, high production process requirements, short circuits, etc., to reduce the formation and improve the initial charge. The effect of discharge efficiency and overcharge resistance

Inactive Publication Date: 2008-03-19
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once these lithium dendrites pierce the separator paper, it will cause a short circuit and cause a safety hazard.
In addition, since the pure lithium metal used is very active, it is easy to react in the air, so an inert gas must be used for protection during the preparation of the negative electrode to prevent the oxidation of metal lithium in the air, which requires high production technology. The cost will be greatly increased

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of the negative electrode: Take 100 parts of 059 type graphite as the negative electrode active material, add 5 parts of the binder polytetrafluoroethylene (PTFE) emulsion (60%), add a certain amount of deionized water, and stir and mix evenly. Drying was carried out at 120°C. In dry air, add 1 part of Li-Al alloy powder to the dried powder, and mechanically mix the two powders evenly. The average particle diameter of the Li-Al alloy powder is 30 μm, and the weight of Al accounts for 50% of the weight of the Li-Al alloy powder. Then, under a pressure of 5 MPa, it is pressed into a cake shape on a stainless steel sheet with a diameter of 15 mm to make a negative electrode sheet for a button battery.

[0035] The preparation of the positive electrode and the electrolyte and the overall preparation of the battery are the same as in Comparative Example 1. Obtain sample 1#.

[0036] Except that 3 parts of Li-Al alloy powder are added to the negative electrode ...

Embodiment 2

[0050] Preparation of the negative electrode: Take 100 parts of 059 type graphite as the negative electrode active material, add 5 parts of the binder polytetrafluoroethylene (PTFE) emulsion (60%), add a certain amount of deionized water, and stir and mix evenly. Drying was carried out at 120°C. In dry air, add 1 part of Li-Al alloy powder to the dried powder, and mechanically mix the two powders evenly. The average particle diameter of the Li-Al alloy powder is 30 μm, and the weight of Al accounts for 79% of the weight of the Li-Al alloy powder. Then, under a pressure of 5 MPa, it is pressed into a cake shape on a stainless steel sheet with a diameter of 15 mm to make a negative electrode sheet for a button battery.

[0051] The preparation of the positive electrode and the electrolyte and the overall preparation of the battery are the same as in Comparative Example 1. Obtain sample 1#.

[0052] Except that 3 parts of Li-Al alloy powder are added to the negative electrode ...

Embodiment 3

[0064] Preparation of the negative electrode: Take 100 parts of 059 type graphite as the negative electrode active material, add 5 parts of the binder polytetrafluoroethylene (PTFE) emulsion (60%), add a certain amount of deionized water, and stir and mix evenly. Drying was carried out at 120°C. Add 1 part of Li-Al alloy powder to the dried powder, and mechanically mix the two powders evenly. The average particle diameter of the Li-Al alloy powder is 30 μm, and the weight of Al accounts for 90% of the weight of the Li-Al alloy powder. Then, under a pressure of 5 MPa, it is pressed into a cake shape on a stainless steel sheet with a diameter of 15 mm to make a negative electrode sheet for a button battery.

[0065] The preparation of the positive electrode and the electrolyte and the overall preparation of the battery are the same as in Comparative Example 1. Obtain sample 1#.

[0066] Except that 3 parts of Li-Al alloy powder are added to the negative electrode sheet of sam...

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Abstract

This invention relates to a nonaqueous electrolytic Li ionic secondary battery including a positive, a negative and a nonaqueous electrolyte characterizing that said negative includes a base plate and a negative active substance adhered on the plate, said active substance includes a basic material and an alloy powder with Li and M selected from Be, Mg Ti Zr Nb Cr Cu and Al, which can increase the first charge and discharge efficiency and overcharge-resistant performance of the battery to make up the irreversible volume of the negative and reduce the form of Li dendrites.

Description

technical field [0001] The invention relates to a nonaqueous electrolyte lithium ion secondary battery. Background technique [0002] In recent years, the technology of lithium-ion secondary batteries has been relatively mature. Compared with the widely used nickel-cadmium batteries and nickel-hydrogen secondary batteries, lithium-ion secondary batteries have less self-discharge, high discharge voltage, high energy density and cycle use. Long life and other advantages. In order to improve the performance of lithium-ion secondary batteries, such as the initial charge and discharge efficiency and cycle performance of the battery, and increase the utilization rate of positive active materials, in addition to the performance of the positive electrode and the non-aqueous electrolyte, the negative electrode is very important. [0003] The negative electrode of lithium ion secondary batteries is generally composed of materials capable of doping and dedoping lithium ions, such as c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40H01M10/38H01M4/38H01M4/58H01M4/48
CPCY02E60/122H01M4/405H01M4/0445H01M4/134Y02E60/10Y02P70/50
Inventor 王传福渠冰江文锋董俊卿
Owner BYD CO LTD
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