A kind of preparation method of graphite-tin composite material for negative electrode of lithium ion battery

A technology for lithium ion batteries and composite materials, which is applied in the field of preparation of graphite-tin composite materials, can solve the problems of difficult storage, high product reactivity, and complicated preparation process of tin-based material fine powder, and achieves the effect of high coulombic efficiency.

Active Publication Date: 2018-10-02
HUNAN SHINZOOM TECH
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Problems solved by technology

[0004] Tin-based materials are a model of metal and alloy materials. It is the earliest and most researched metal and alloy anode materials. However, up to now, no tin-based materials in the world have achieved large-scale production. This is due to the Lithium battery anode companies want to directly develop silicon-based anode materials with higher capacity. On the other hand, the preparation process of tin-based material fine powder is cumbersome, and the product has high reactivity and is not easy to store.

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  • A kind of preparation method of graphite-tin composite material for negative electrode of lithium ion battery

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Embodiment 1

[0025] A preparation method of graphite tin composite material for lithium ion battery negative electrode, the steps are as follows:

[0026] A1. Add natural flake graphite with a purity of 99.95% and a particle size of 200 mesh and tin oxide with a particle size of 3μm into the fusion machine at a ratio of 100:5. 2 Under protective atmosphere, heat to 250℃ and keep constant temperature for 2h. During heating and constant temperature, the fusion machine keeps high-speed stirring at 3000rpm;

[0027] A2. The fusion material obtained in step A1 is directly vacuum conveyed from the fusion machine to the VC mixer, and an appropriate amount of asphalt with a softening point of 180℃ is added for mixing and coating. The total amount of asphalt is the quality of the natural flake graphite in step A1 The mixing and coating speed is 200rpm, and the mixing and coating time is 30min;

[0028] A3. Put the coating material obtained in step A2 into the crucible by the manipulator, and then place it...

Embodiment 2

[0031] A preparation method of graphite tin composite material for lithium ion battery negative electrode, the steps are as follows:

[0032] A1. First spray natural flake graphite with a purity of 99.95% and a particle size of 200 mesh with an oxidant solution to form uneven oxidation pits on the surface. The oxidant solution can be peroxide, permanganic acid, or chlorate. , Hydrochloric acid, sulfuric acid, etc. Then the oxidized natural flake graphite is laid flat on the bottom surface of the fusion machine. The fusion machine adopts interval heating, first heating to 200~300℃, and then cooling to 0~10℃, heating and cooling alternately, interval time period When the natural flake graphite is curled and deformed, use a spray granulator to spray tin oxide particles with a temperature of 1600°C-1630°C. The size of the tin oxide particles is 7μm, and the quality of the natural flake graphite and tin oxide Spray in the ratio of 100:20, in N 2 Heat to 400°C under a protective atmos...

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Abstract

The invention provides a preparation method of a graphite tin composite material for a negative electrode of a lithium-ion battery. The graphite tin composite material is prepared by fusing, coating, carbonizing and screening natural flake graphite, tin oxide and asphalt as raw materials. According to the negative electrode material powder of the graphite tin composite material prepared by the method, the resistivity is smaller than 20mohm.cm, the compaction density can reach 1.6g / cc, the reversible capacity is 400-500mAh / g, the first efficiency is about 93%, the full-charge expansion rate of an electrode plate is lower than 25% and the capacity retention ratio after 800 cycles at 0.5C rate is still over 80%. The preparation method has the advantages that the efficiency is high, the operation is simple and full automation is easy to achieve.

Description

Technical field [0001] The invention relates to a method for preparing a negative electrode material for a lithium ion battery, in particular to a method for preparing a graphite tin composite material for a negative electrode of a lithium ion battery. Background technique [0002] Improving energy density is the main development direction of lithium-ion batteries. The theoretical capacity of traditional graphite anode materials is only 372mAh / g. Therefore, the development of new high-capacity anode materials to replace traditional graphite anode materials has become a top priority. [0003] Research on high-capacity lithium-ion batteries is mainly focused on: silicon-based materials, metals and alloy materials, metal oxide materials, etc. The electrical conductivity of silicon-based materials and the volume effect of lithium intercalation and deintercalation restrict their application in the negative electrode of lithium-ion batteries; the first electrochemical cycle of metal oxid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/364H01M4/48H01M4/625H01M10/0525Y02E60/10
Inventor 石磊邵浩明蒋文昶皮涛
Owner HUNAN SHINZOOM TECH
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