Anode of lithium ion cell and lithium ion cell

A lithium-ion battery and positive electrode technology, applied in the direction of battery electrodes, electrode carriers/collectors, secondary batteries, etc., can solve the problems of battery electrochemical performance deterioration, difficult to achieve, bad by-products, etc., achieve low cost, improve quality, improved circulation

Active Publication Date: 2008-09-03
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is also to process the material, and the decomposition products of the above-mentioned additives are easy to absorb moisture in the air during the battery manufacturing process, and it is difficult to achieve its original purpose.
In addition, some additives may form undesirable by-products due to the combination with acid substances in the battery system, which will actually deteriorate the electrochemical performance of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A certain amount of PVDF (polyvinylidene fluoride) was dissolved in NMP (N-methylpyrrolidone) at a certain ratio, and LiMn 2 o 4 (Lithium manganese oxide) and acetylene black are added in this solution, fully mix and make slurry, and its weight percent composition is LiMn 2 o 4 : Acetylene black: PVDF = 91:5:4. The slurry was uniformly coated on a 20 μm aluminum foil, dried at 120° C., sprayed with 0.1% by weight lithium phosphate aqueous solution on the surface of the positive electrode sheet, dried in vacuum, and rolled to obtain the positive electrode sheet.

[0028] Dissolve a certain amount of PVDF in NMP at a certain ratio, add artificial graphite into the solution, and mix thoroughly to form a slurry, the composition of which is artificial graphite:PVDF=95:5 in % by weight. The slurry was evenly coated on a 20 μm copper foil, dried at 120° C., and rolled to obtain a negative electrode sheet.

[0029] The above-mentioned positive and negative electrode sheets ...

Embodiment 2

[0031] The positive electrode sheet is prepared according to the following steps:

[0032] A certain amount of PVDF was dissolved in NMP at a certain ratio, and the LiMn 2 o 4 and acetylene black are added to the solution, fully mixed to make a slurry, and its weight percent composition is LiMn 2 o 4 : Acetylene black: PVDF = 91:5:4. The slurry was evenly coated on a 20 μm aluminum foil, dried at 120° C., and then the positive electrode sheet was immersed in a 0.1% by weight lithium phosphate aqueous solution, taken out after 20 minutes, vacuum-dried, and rolled to obtain the positive electrode sheet.

[0033] Other steps are the same as in Example 1.

Embodiment 3

[0035] The positive electrode sheet is prepared according to the following steps:

[0036] A certain amount of PVDF was dissolved in NMP at a certain ratio, and the LiMn 2 o 4 and acetylene black are added to the solution, fully mixed, and its weight percent composition is LiMn 2 o 4 : Acetylene black: PVDF=91: 5: 4, then add 2% by weight of lithium phosphate powder, disperse evenly to make positive electrode slurry. The slurry was uniformly coated on a 20 μm aluminum foil, dried at 120° C., and rolled to obtain a positive electrode sheet.

[0037] Other steps are the same as in Example 1.

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PUM

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Abstract

A positive electrode of Li ion battery features that it contains Li salt chosen from lithium phosphate, dilithium hydrogen phosphate, lithium sulfate, lithium molybdate, lithium titanate, etc. A Li ion battery with high high-temp cycle performance and storage nature is composed of said positive electrode, diaphragm, negative electrode and non-water electrolyte.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a positive electrode of the lithium ion battery containing lithium salt and a lithium ion battery using the positive electrode. Background technique [0002] Lithium cobalt oxide (LiCoO 2 ), however, because the cobalt metal resource is scarce, expensive, toxic and poor in safety, it occupies a high cost in lithium-ion batteries, so it is not suitable for large-capacity battery fields with large material consumption (such as tool batteries, notebooks, etc.) computer battery, car battery, bicycle battery, etc.). In contrast, manganese-based cathode materials (such as lithium manganate LiMn 2 o 4 ) is easy to prepare. Compared with cobalt and nickel, manganese is cheap, widely available and non-toxic. In addition, the lithium-ion secondary battery safety performance of this type of positive electrode material is also very good, and has a wide application prospect. However, at higher te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M4/58H01M4/48H01M4/66H01M10/40
CPCY02E60/122Y02E60/10
Inventor 潘福中周耀华
Owner BYD CO LTD
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