Composite negative electrode material for lithium ion battery, preparing method thereof, negative electrode using material 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 capacity retention rate, and low hydrothermal method yield, etc., to improve electrochemical performance. Performance, rich sources, low cost effects

Active Publication Date: 2016-02-24
杭州烯谷科技有限公司
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  • Abstract
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  • 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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  • Composite negative electrode material for lithium ion battery, preparing method thereof, negative electrode using material and lithium ion battery
  • Composite negative electrode material for lithium ion battery, preparing method thereof, negative electrode using material and lithium ion battery
  • Composite negative electrode material for lithium ion battery, preparing method thereof, negative electrode using material and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Preparation of negative electrode material: Fe with a particle size of 100 nm 2 o 3 Powder and acetylene black with a particle size of 100nm are mixed in 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 50-200nm, 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, good dispersion, and particle size is 50-200nm.

[0044] 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 fluoride (PVDF) are m...

Embodiment 2

[0050] Preparation of negative electrode material: Fe2O3 powder with a particle size of 10 nm and graphite with a particle size of 10 μm are mixed in a ratio of 7:3 in mass fraction, and ball milled on a ball mill. The ball milling medium is water, and the ball mill product is dried. get Fe 2 o 3 / 30wt.% graphite composite powder material, the particle size of the composite powder material is 50nm-15μm.

[0051] Preparation of the negative electrode: with N-methyl-pyrrolidone (NMP) as solvent, the prepared Fe 2 o 3 % 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.

[0052]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 solvent, and th...

Embodiment 3

[0056] Preparation of negative electrode material: 100nm Fe 2 o 3 and acetylene black of 50nm 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 50-200nm.

[0057] Th...

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Abstract

The invention relates to a composite negative electrode material for a lithium ion battery, a preparing method thereof, a negative electrode using the material and a lithium ion battery. Fe2O3 and a carbon material are used as raw materials, the carbon material is any one or a mixture of any two or three of acetylene black, graphite and carbon black, a Fe2O3 and carbon composite powder material is obtained through ball milling, and then a composite powder material containing the carbon material and iron oxides containing one or two or three of Fe2O3, Fe3O4 and FeO is obtained through calcining at certain temperature. The ratio of the iron oxides to the carbon material in the composite powder material can be adjusted and controlled by changing the initial ratio, and the kind of the iron oxides can be controlled by controlling calcining temperature and time. The preparing method of the composite powder material is simple, high in production efficiency and suitable for large-scale production. The composite powder material used as the negative electrode material for the lithium ion battery is high in discharging capacity and circulation stability, and an electrode made of the material is high in specific capacity, excellent in cycling performance and particularly suitable for industrial application of the lithium ion battery.

Description

[0001] The patent application for this invention is accepted by the State Intellectual Property Office of the People's Republic of China. Application number: 201110412275.2, application date: December 12, 2011, applicant: Zhejiang University, invention name: Lithium-ion battery composite negative electrode material and its preparation method and use A divisional application for the negative electrode of the material and lithium-ion batteries. technical field [0002] 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 [0003] 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52H01M4/62H01M4/131H01M10/0525
CPCH01M4/131H01M4/521H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 潘洪革王朋高明霞刘永锋
Owner 杭州烯谷科技有限公司
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