Preparation method of carbon/graphite/tin composite anode material

A technology of composite materials and negative electrode materials, which is applied in the field of preparation of carbon/graphite/tin composite negative electrode materials, can solve the problems of high resistance, poor cycle performance, and reduced battery capacity of tin-carbon composite materials, and achieve excellent product performance. The effect of high capacity and simple production process

Inactive Publication Date: 2015-09-30
田东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the tin-carbon composite material is heat-treated at a higher temperature, the tin particles are easier to fuse together and agglomerate into large particles. Carbon composite materials have high resistance and poor conductivity

Method used

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  • Preparation method of carbon/graphite/tin composite anode material
  • Preparation method of carbon/graphite/tin composite anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The ingredients are: ≤1mm microcrystalline graphite 5%, ≤100nm nano tin 5%, ≤0.075mm calcined petroleum coke 26%, 1~4mm calcined petroleum coke 15%, 4~l0mm electric calcined anthracite 10%, 10-16mm electric calcined Anthracite 5%, 10-16mm calcined pitch coke 14%, acetylene carbon black 2%, coal tar pitch 18%. Add T300PAN chopped carbon fiber (diameter 12μm, length 10mm) with 1% of the above raw material weight, the preparation steps are as follows:

[0030] (1) Ingredients and kneading, first add carbon black, natural graphite, nano-tin, calcined petroleum coke powder, calcined petroleum coke, electric calcined anthracite and calcined pitch coke into the kneader, the dry mixing time is 35 minutes, and the dry mixing temperature is 120°C; when the dry mixing temperature reaches the set time and temperature, add coal tar pitch at 175°C for wet mixing, the wet mixing time is 30 minutes, and the kneading temperature is 160°C to form a composite plastic body;

[0031] (2) R...

Embodiment 2

[0035] The ingredients are: ≤1mm microcrystalline graphite 5%, ≤100nm nano tin 10%, ≤0.075mm calcined petroleum coke 25%, 1~4mm calcined petroleum coke 13%, 4~l0mm electric calcined anthracite 8%, 10-16mm electric calcined Anthracite 5%, 10-16mm calcined pitch coke 14%, acetylene carbon black 2%, coal tar pitch 18%. Add 1% T300PAN chopped carbon fiber (diameter 12μm, length 10mm), the preparation steps are as follows:

[0036] (1) Ingredients and kneading, first add carbon black, natural graphite, nano-tin, calcined petroleum coke powder, calcined petroleum coke, electric calcined anthracite and calcined pitch coke into the kneader, and then add chopped carbon fiber after an interval of 5-6 minutes Carry out dry mixing, the dry mixing time is 35 minutes, and the dry mixing temperature is 120°C; when the dry mixing temperature reaches the set time and temperature, add coal tar pitch at 175°C for wet mixing, the wet mixing time is 30 minutes, and the kneading temperature At 160...

Embodiment 3

[0041] Using the same ingredients as in Example 2, plus 2% T300PAN chopped carbon fiber (diameter 12 μm, length 10 mm), the process is as in Example 1.

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Abstract

The invention relates to a preparation method of a carbon / graphite / tin composite anode material. The carbon / graphite / tin composite anode material adopts the following raw materials in percentage by weight and particle size: 1.5-2.5% of carbon black, 5-8% of natural graphite with the particle size being smaller than or equal to 1 mm, 3-10% of nanosized tin with the particle size being smaller than or equal to 100 nm, 25-30% of calcined petroleum coke powder with the particle size being smaller than or equal to 0.075 mm, 15-20% of calcined petroleum coke with the particle size being 1-4 mm, 10-15% of electric calcined anthracite with the particle size being 4-10 mm, 5-10% of electric calcined anthracite with the particle size being 10-16 mm, 5-15% of calcined pitch coke with the particle size being 10-16 mm, 18-20% of coal pitch, and short carbon fiber, wherein short carbon fiber accounts for 1-3% the total amount of the raw materials. The carbon / graphite / tin composite anode material is prepared by adopting the steps of burdening, mixing, kneading, roasting, graphitizing, smashing, and spheroidizing. The carbon / graphite / tin composite anode material prepared by adopting the preparation method provided by the invention combines respective advantages of carbon material, graphite material and tin powder when serving as anode materials, and the prepared carbon / graphite / tin composite anode material has the characteristics of high first-cycle capacity, high initial charge-discharge efficiency, electrolyte solvent resistance and isotropic homogeneity and the like.

Description

technical field [0001] The invention relates to a method for preparing a carbon / graphite / tin composite negative electrode material, belonging to the technical field of lithium ion batteries. Background technique [0002] Since the early 1990s, Japan's Sony Energy Technology Corporation first successfully developed lithium-ion batteries using carbon negative electrodes, lithium-ion batteries have rapidly occupied the civilian secondary battery market at an average annual rate of 15%, and have become the first choice for portable electronic devices. power supply. The rapid development of lithium-ion batteries is mainly due to the contribution of electrode materials, especially the progress of negative electrode materials. Lithium-ion battery anode materials are required to have the following characteristics: ① as low as possible electrode potential; ② high ion diffusion rate in the solid structure of the anode; ③ high reversibility of deintercalation; ④ good electrical conduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/364H01M10/0525H01M4/36Y02E60/10
Inventor 田东
Owner 田东
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