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Lithium secondary battery composite graphite and preparation method thereof

A lithium secondary battery and composite graphite technology, which is applied to secondary batteries, graphite, battery electrodes, etc., can solve the problems of poor fast charge and discharge performance, long lithium ion diffusion path, troublesome processing procedures, etc., and achieve excellent overall performance, The preparation method is simple and feasible, and the effect of stable product properties

Inactive Publication Date: 2017-03-22
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the defects of these modification methods are very obvious
For example, due to the good crystallinity of graphite and well-developed layer orientation, lithium ions are only allowed to intercalate and extract along the boundaries of graphite. Therefore, these modification methods have a long diffusion path for lithium ions and are not suitable for high-current charging and discharging; the raw material particles used in these methods are generally relatively small. Large, obvious anisotropy, so the rapid charge and discharge performance is poor; the raw material utilization rate of these methods is low, and the general shaping yield is only about 50%; these methods are based on raw material shaping treatment, in order to pursue better Sphericity, troublesome processing procedures, increased processing costs

Method used

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  • Lithium secondary battery composite graphite and preparation method thereof
  • Lithium secondary battery composite graphite and preparation method thereof
  • Lithium secondary battery composite graphite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The petroleum asphalt is crushed to below 5 μm, and 200 kg of petroleum asphalt coke powder (D50 is 9.1 μm) and 60 kg of asphalt powder, graphitization catalyst (SiO 2 ) 16kg to mix in the mixing pot. Under the protection of nitrogen, heat treatment at a low temperature of 500°C for 16 hours, then cool the reaction product to room temperature, composite granulate, and then carry out a high-temperature catalytic graphitization treatment at 2800°C for 36 hours, mix and sieve, and obtain The lithium secondary battery composite graphite with a particle size D50 of 17.8 μm has a half-cell capacity of 367.5mAh / g and an initial efficiency of 95.8%.

Embodiment 2

[0033] The petroleum asphalt is crushed to below 5 μm, and under stirring, 200 kg of petroleum asphalt coke powder (D50 is 9.5 μm), 20 kg of asphalt powder, and 6 kg of graphitization catalyst (SiC) are alternately added to the mixing pot for mixing. Under the protection of nitrogen, heat treatment at a low temperature of 500°C for 16 hours, then cool the reaction product to room temperature, compound granulate, and carry out high-temperature treatment of catalytic graphitization at 3000°C for 48 hours, mixing and sieving to obtain The particle diameter D50 is 18.3 μm lithium secondary battery composite graphite, its half battery capacity is 368.1mAh / g, and the first efficiency is 96.2%.

Embodiment 3

[0035] Coal tar pitch is pulverized to less than 5 μm, and 200 kg of coal tar pitch coke powder (D50 is 5.1 μm) and 40 kg of pitch powder, graphitization catalyst (SiO 2 ) 10kg to mix in the mixing pot. Under the protection of nitrogen, heat treatment at a low temperature of 800°C for 10 hours, then cool the reaction product to room temperature, compound granulate, and carry out high-temperature treatment of catalytic graphitization at 3200°C for 48 hours, mixing and sieving to obtain The particle diameter D50 is 17.4 μm and the lithium secondary battery composite graphite has a half-cell capacity of 370.0mAh / g and an initial efficiency of 95.6%.

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Abstract

The invention discloses lithium secondary battery composite graphite and a preparation method thereof. The method comprises the following steps: (1) pitch coke raw materials are crushed, shaped and treated, median particle size D 50 is controlled between 5-10[mu]m; (2) pitch coke raw materials, an easily graphitized adhesive and a graphitized catalyst are mixed; (3) in the protection of inert gas, low temperature heat treatment is carried out at 300-800 DEG C, combination and granulation are carried out, and the temperature is cooled to room temperature; (4) in the protection of inert gas, catalytic graphitization is carried out at 2800-3200 DEG C, and high temperature treatment is carried out; (5) batch mixing and sieving are carried out in order to obtain the graphite. The invention also relates to lithium secondary battery composite graphite prepared by the method. The lithium secondary battery composite graphite has the advantages of large discharge capacity, good cycle performance, high compacted density, good electrochemical performance, high discharging platform conservation rate, good heavy current charging and discharging performance, and good safety.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a lithium secondary battery composite graphite and a preparation method thereof. Background technique [0002] In recent years, with the miniaturization of electronic devices, there has been an increasing need for a secondary battery with a larger capacity. Of particular interest are lithium-ion batteries, which have a higher energy density than nickel-cadmium or nickel-metal hydride batteries. Although extensive research has been conducted on increasing the battery capacity, further increases in battery capacity are required as the requirements for battery performance increase. [0003] As negative electrode materials for lithium ion batteries, granular materials such as metals or graphite have been studied. With the increase of battery capacity, it is especially necessary to use higher electrode density (such as 1.75g / cm 3 or higher than 1.75g / cm 3 ) The negative electrode material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/62H01M4/36C01B32/20H01M10/0525
CPCH01M4/362H01M4/583H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 谢秋生吴志红张鹏昌仲林
Owner SHANGHAI SHANSHAN TECH CO LTD
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