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Lithium ion secondary battery and preparation method thereof

A secondary battery and lithium-ion technology, applied in secondary battery, electrolyte storage battery manufacturing, battery electrodes, etc., can solve problems such as capacity fading, achieve the effect of improving charge and discharge capacity, safety performance and electrical performance

Active Publication Date: 2013-01-30
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-performance asymmetric lithium-ion secondary battery provided by the present invention solves the problem of significant capacity attenuation of the existing lithium-ion secondary battery under high-current and high-rate conditions, and has high safety performance, excellent cycle stability, and high discharge capacity under high current. High specific capacity, simple process plan, convenient operation, high yield of battery production and other outstanding advantages

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Preparation of positive electrode sheet

[0053] Weigh the iron vanadium manganese lithium positive electrode active material doped with 0.01% nano-titanium dioxide, the conductive agent acetylene black and the binder polyvinylidene fluoride in proportion, so that the ratio of the three mass percentages is 70%: 20% : 10%. First dissolve and disperse polyvinylidene fluoride and superconducting carbon in N-methylpyrrolidone under high-speed vacuum stirring (stirring speed is 2000~8000 r / min), then add the above-mentioned positive electrode active material to it, and continue high-speed vacuum stirring (stirring rate is 2000~8000 rev / min) to disperse it evenly to obtain positive electrode slurry, and adjust the viscosity of the above slurry to 3800~7500mPa.s with N-methylpyrrolidone according to the coating requirements, and finally The resulting slurry was passed through a 150-mesh sieve once. The slurry is evenly coated on the aluminum foil of the positive electrode cu...

Embodiment 2

[0058] Preparation of positive electrode sheet

[0059] Weigh the iron vanadium manganese lithium positive electrode active material doped with 10% nano-magnesium oxide and titanium oxide nanowires, the mixture of conductive agent superconducting carbon (Super P) and graphene, and the binder polybias Vinyl fluoride, so that the mass percentage ratio of the three is 90%:5%:5%. Except that the obtained positive electrode slurry was passed through a 180-mesh sieve once, other specific positive electrode slurry and positive electrode sheet preparation processes were the same as in Example 1.

[0060] Preparation of negative electrode sheet

[0061] Weigh the composite material of lithium titanate and nano-silver, the conductive agent mesophase carbon microspheres and the binder polyvinylidene fluoride with the spinel structure of the negative electrode active material in proportion, so that the ratio of the mass percentage of the three is 75%: 15%: 10%. The preparation process ...

Embodiment 3

[0064] Preparation of positive electrode sheet

[0065] Weigh in proportion the doped mass fraction of 5% nano-copper oxide, nano-alumina and tungsten oxide nanowire lithium iron vanadium manganese lithium positive electrode active material, the mixture of conductive agent conductive carbon black and carbon nanotubes and binder polybias Vinyl fluoride, so that the mass percentage ratio of the three is 80%:10%:10%. Except that the obtained positive electrode slurry was passed through a 150-mesh sieve three times, other specific positive electrode slurry and positive electrode sheet preparation processes were the same as in Example 1.

[0066] Preparation of negative electrode sheet

[0067] Weigh the negative electrode active material nano-scale lithium titanate with spinel structure and nano-silicon composite material, conductive agent conductive graphite and binder polyvinylidene fluoride in proportion, so that the ratio of the three mass percentages is 80%: 12%: 8%. The p...

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Abstract

The invention relates to a lithium ion secondary battery which consists of a shell, a positive electrode plate, a diaphragm, a negative electrode plate and electrolyte. The positive electrode plate consists of a positive electrode current collector and a negative electrode active material bonded on the positive electrode current collector; the negative electrode plate consists of a negative electrode current collector and a negative electrode active material bonded on the negative electrode current collector; the positive electrode active material is an iron phosphate ferrovanadium lithium composite material of a nano oxide doped with an M element; the negative electrode active material is a lithium titanate composite material; the M element is selected from any one or the combination of at least two of aluminum, lithium, boron, silver, copper, chromium, zinc, titanium, gallium, germanium, zirconium, tin, silicon, iron, cobalt, nickel, vanadium, magnesium, calcium, strontium, barium, tungsten, molybdenum, niobium, yttrium, lanthanum, selenium and cadmium; the lithium oil secondary battery has the obvious characteristics of excellent electrical chemical performance, high safe performance, long cycle service life, low cost, environment friendliness and the like, is beneficial to widening the application range of the lithium ion battery, and has important practical significance and wide market prospect.

Description

technical field [0001] The invention relates to a lithium-ion secondary battery and a preparation method thereof, in particular to a high-performance asymmetric lithium-ion secondary battery and a preparation method thereof, belonging to the technical field of batteries and capacitors, in particular to the preparation technology of lithium-ion secondary batteries field. Background technique [0002] At present, there is a global shortage of natural resources such as oil and coal, and environmental pollution and other problems are becoming more and more serious. The comprehensive and efficient development and utilization of new energy and environmental protection technologies has become one of the urgent problems for human beings. Due to the advantages of high working voltage, high specific energy, no memory effect, no pollution, small self-discharge, and long cycle life, lithium-ion batteries are gradually replacing traditional secondary batteries such as nickel-cadmium and...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/58H01M4/485H01M10/0525H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 谭强强徐宇兴
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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