Secondary lithium ion battery and preparation method thereof

A technology of lithium-ion batteries and cations, applied in the direction of secondary batteries, secondary battery repair/maintenance, electrolyte storage battery manufacturing, etc., can solve problems such as inability to fully realize battery functions, affect battery life, and reduce battery capacity, and achieve suitable It is suitable for large-scale industrial production, suppresses adverse side effects, and eliminates metal impurities

Inactive Publication Date: 2012-10-03
HUNAN FENGYUAN YESHINE KINGCO NEW ENERGY
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  • Abstract
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Problems solved by technology

[0003] During the battery manufacturing process, when metal impurities are mixed into the battery, an internal short circuit will occur, resulting in a sharp decrease in battery capacity; the addition of a large amount of metal impurities will lead to the inability to fully realize the function of the battery; due to various factors in the battery cell The ingress of water and the gas generated in the electrochemical reaction will also seriously affect the service life of the battery

Method used

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  • Secondary lithium ion battery and preparation method thereof
  • Secondary lithium ion battery and preparation method thereof

Examples

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Embodiment 1

[0027] The positive active material of the battery in this embodiment is the ternary material nickel-cobalt lithium manganese oxide (LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 ), the negative electrode active material is graphitized carbon, and the electrolyte is LiP containing 1.05M 6 f 4 Solute in ethylene carbonate and ethyl methyl carbonate (3:7, w / w) solution.

[0028] The surface of the negative pole of the battery in this embodiment is coated with lithium ions (Li + ) of aluminosilicates and Al 2 o 3 mixtures, mixtures of aluminosilicates and Al 2 o 3 The weight ratio is 1:1; the coating thickness is controlled at 3±2um.

[0029]Preparation of the negative electrode of the battery in this example: First, the mixture of the anode exchange material and the inorganic material, and polyvinylidene fluoride (3 wt% of the mixture) are evenly dispersed in the organic solvent NMP to make a fluid slurry. The solid content of the material was set at 20wt%, and then coated on the surface...

Embodiment 2

[0032] The only difference between this embodiment and embodiment 1 is that the sodium ion (Na + ) aluminosilicates instead of containing lithium ions (Li + ) of aluminosilicates.

[0033] The lithium-ion secondary battery of this embodiment was tested for cycle, self-discharge at 45°C for 28 days, hot box at 150°C for 30 minutes, short circuit, extrusion, and acupuncture. The test results are shown in Table 1 and Table 2.

Embodiment 3

[0035] The only difference between this embodiment and embodiment 1 is that the ammonium ion (NH 4+ ) aluminosilicates instead of containing lithium ions (Li + ) of aluminosilicates.

[0036] The lithium-ion secondary battery of this embodiment was tested for cycle, self-discharge at 45°C for 28 days, hot box at 150°C for 30 minutes, short circuit, extrusion, and acupuncture. The test results are also shown in Table 1 and Table 2.

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Abstract

The invention relates to a secondary lithium ion battery and a preparation method thereof. The secondary lithium ion battery comprises an anode, a cathode, a diaphragm and a non-water electrolyte, wherein the surface of the cathode is coated with a mixture containing an anode exchange mateiral and an inorganic material, the anode exchange material is aluminosilicate or phosphoaluminate containing anions of lithium, sodium and ammonium, the inorganic material is Al2O3 or SiO2, and in addition, the mass ratio of the anode exchange material to the inorganic material is (1:50)-(10:1). Compared with the traditional lithium ion battery, the lithium ion battery disclosed by the invention is obviously promoted in safety performance and cycle performance, and is long service life and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a secondary lithium ion battery and a preparation method thereof, in particular to a secondary lithium ion battery with a mixture of an anode exchange material and an inorganic material attached to the negative electrode and a preparation method thereof. The invention belongs to the technical field of lithium ion battery preparation. Background technique [0002] Lithium-ion batteries have developed rapidly in recent years because of their advantages such as high specific energy and no memory effect. However, the safety performance and cycle performance of lithium-ion batteries have always been the key issues restricting its development. Improving the safety of lithium-ion batteries and lithium-ion battery technology for high-power rapid charging and discharging have become the difficulties and focuses of current technical research. [0003] During the battery manufacturing process, when metal impurities are mixed into the ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/62H01M10/42H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 金旭东罗朝晖
Owner HUNAN FENGYUAN YESHINE KINGCO NEW ENERGY
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