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Lithium ion battery composite negative electrode material, its preparation method, negative electrode with application of material thereof and lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of unsatisfactory cycle stability, low yield of hydrothermal method, low capacity retention rate, etc., and achieve improved electrochemical performance. Performance, low cost, source-rich effects

Inactive Publication Date: 2012-04-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the hydrothermal method has problems such as low yield and complicated process.
Chinese patent CN102244238A discloses that acrylonitrile oligomers and iron oxide are used as raw materials to prepare graphene-like doped iron-based compound negative electrode materials and its preparation method, but the cycle stability of this material as negative electrode materials for lithium-ion batteries is still not ideal. Under the discharge rate of 0.1C, the capacity retention rate after 50 cycles is less than 64%

Method used

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  • Lithium ion battery composite negative electrode material, its preparation method, negative electrode with application of material thereof and lithium ion battery
  • Lithium ion battery composite negative electrode material, its preparation method, negative electrode with application of material thereof and lithium ion battery
  • Lithium ion battery composite negative electrode material, its preparation method, negative electrode with application of material thereof and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Preparation of negative electrode material: Fe with a particle size of 100 nm 2 o 3 The powder is mixed with acetylene black with a particle size of 100 nm at a mass fraction of 3:7, and ball milled on a ball mill, the ball milling medium is acetone, and the ball milled product is dried to obtain Fe 2 o 3 / 70wt.% acetylene black composite powder material (wt.% refers to mass percentage, the same as in the following examples), to obtain the lithium ion battery negative electrode material. The particle size of the composite powder material is 50-200 nm, and its scanning electron microscope picture is as follows: figure 1 As shown, Fe can be seen in the figure 2 o 3 / Acetylene black has good combination and good dispersion, and the particle size is 50-200 nm.

[0040] Preparation of the negative electrode: with N-methyl-pyrrolidone (NMP) as solvent, the prepared Fe 2 o 3 / 70wt.% acetylene black composite negative electrode material and binder polyvinylidene fluorid...

Embodiment 2

[0046] Preparation of negative electrode material: Mix Fe2O3 powder with a particle size of 10 nm and graphite with a particle size of 10 μm at a mass fraction of 7:3, and perform ball milling on a ball mill, the ball milling medium is water, and the ball milled product is baked Dry, get Fe 2 o 3 / 30wt.% graphite composite powder material, the particle size of the composite powder material is 50 nm-15 μm.

[0047] Preparation of the negative electrode: with N-methyl-pyrrolidone (NMP) as solvent, the prepared Fe 2 o 3 / 30wt.% graphite composite negative electrode material and binder polyvinylidene fluoride (PVDF) are uniformly mixed in a mass ratio of 8:1, coated on the current collector copper foil, and then dried to prepare the lithium ion battery negative electrode.

[0048] Preparation of the positive electrode: Using N-methyl-pyrrolidone (NMP) as the solvent, lithium cobaltate, PVDF and conductive agent acetylene black in a weight ratio of 8:1:1 were added to the solven...

Embodiment 3

[0052] Preparation of negative electrode material: 100 nm of Fe 2 o 3 and acetylene black of 50 nm are mixed on a ball mill with a mass fraction of 4:6, and ball milled on the ball mill, with acetone as the ball milling medium, and the ball milled product is dried to obtain Fe 2 o 3 / 60wt.% acetylene black composite powder material; then the material was calcined at 400°C for 6 hours in a nitrogen atmosphere to carry out carbothermal reduction reaction, and then the sample was cooled to room temperature and then taken out to obtain Fe 2 o 3 / Fe 3 o 4 / Acetylene black composite powder material, the content of acetylene black in the composite material is about 60wt.% (the error is 0~1wt.%), the X-ray diffraction pattern of the composite powder material is as follows Figure 4 As shown, the figure shows that the composite powder material contains Fe 2 o 3 and Fe 3 o 4 Two kinds of iron series oxides, the particle size of the composite powder material is 50-200 nm.

[00...

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Abstract

The invention relates to a lithium ion battery composite negative electrode material, its preparation method, a negative electrode with the application of the material thereof and a lithium ion battery. According to the preparation method, Fe2O3 and a carbon material are used as raw materials. The carbon material is one component, random two components or a mixture of three components, wherein the components are selected from the group consisting of acetylene black, graphite and carbon black. A Fe2O3-and-carbon composite powdered material is obtained by ball milling. Or an iron oxide and carbon material containing composite powdered material is obtained by calcining at a certain temperature, wherein the iron oxides contain one, two or three components selected from Fe2O3, Fe3O4 and FeO. The ratio of the iron oxides to the carbon material in the composite powdered material can be adjusted and controlled by changing the initial ratio. The type of the iron oxides can be controlled by controlling the calcining temperature and time. The preparation method of the composite powdered material is simple, has high production efficiency and is suitable for large-scale production. With the application of the composite powdered material, the lithium ion battery negative electrode material is endowed with high discharge capacity and good cycle stability. The electrode prepared by the material has high specific capacity and excellent circularity, and is very suitable for the industrial application of the lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a negative electrode material for lithium ion batteries, a preparation method thereof, a negative electrode using the material, and a lithium ion battery. Background technique [0002] As a green energy developed in the 1990s, lithium-ion batteries have the following advantages over traditional lead-acid, nickel-cadmium, nickel-metal hydride and other secondary batteries: high reversible capacity, long cycle life and high energy density, no memory effect Wait. Especially in the environment of energy crisis and increasingly prominent environmental problems, the research and development of lithium-ion batteries is becoming more and more important. Electrode materials play a key role in the performance of lithium-ion batteries. At present, the commercial lithium-ion battery anode materials mainly use carbon-based materials, mainly graphite, but its low specific capacity and sp...

Claims

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Application Information

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IPC IPC(8): H01M4/52H01M4/62H01M4/131H01M10/0525
CPCY02E60/122H01M4/131H01M4/521H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 潘洪革王朋高明霞刘永锋
Owner ZHEJIANG UNIV
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