Composite mesophase negative electrode material, lithium ion secondary battery, preparation method and application

A technology of negative electrode material and mesophase, applied in the field of composite mesophase negative electrode material, can solve the problems of poor cycle performance and low discharge capacity of mesophase negative electrode material, etc.

Active Publication Date: 2020-06-05
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defects of low discharge capacity and poor cycle performance of existing mesop

Method used

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  • Composite mesophase negative electrode material, lithium ion secondary battery, preparation method and application
  • Composite mesophase negative electrode material, lithium ion secondary battery, preparation method and application
  • Composite mesophase negative electrode material, lithium ion secondary battery, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Petroleum pitch is crushed to below 0.1 mm, and 60 kg of petroleum coke calcined raw coke powder (D50 is 25.1 μm), 140 kg of mesocarbon microsphere green balls (D50 is 25.4 μm) and graphitization catalyst (SiO 2 ) 16kg, mixed evenly, mixed with pitch powder 60kg in a kneading pot, and kneaded for 1 hour at 160°C. After the kneading was completed, it was pressed into a sheet (4mm) in a tablet machine, and crushed into particles with a particle size of less than 100 μm. Briquetting is formed. Under the protection of nitrogen, carbonize at 1100°C for 2 hours, then cool the reaction product to room temperature, and then carry out high-temperature catalytic graphitization at 2800°C for 36 hours to obtain a composite with a particle size D50 of 17.8 μm. The intermediate phase negative electrode material has a half-battery capacity of 367.5mAh / g and an initial efficiency of 95.8%.

Embodiment 2

[0079] The petroleum pitch is crushed to less than 0.1mm, and 80kg of petroleum coke raw coke powder (D50 is 9.5μm), 120kg of mesophase carbon microspheres (D50 of 25.4μm) and graphitization catalyst (SiC) 6kg are added alternately under stirring Evenly, mix with asphalt powder 20kg in a kneading pot, and knead at 160°C for 1 hour. After kneading, press it into a tablet (3mm) in a tablet machine, crush it into particles with a particle size of less than 100μm, and briquette it. . Under the protection of nitrogen, carbonize at 800°C for 6 hours, then cool the reaction product to room temperature, and then carry out high-temperature catalytic graphitization at 3000°C for 48 hours to obtain a composite with a particle size D50 of 18.3 μm. The intermediate phase negative electrode material has a half-battery capacity of 368.1mAh / g and an initial efficiency of 95.2%. The first charge and discharge curve of the lithium secondary battery prepared in this embodiment is as follows: f...

Embodiment 3

[0081] Coal tar pitch is crushed to less than 0.1 mm, and 100 kg of green coke powder (D50 is 50.0 μm) before pitch coke calcining, 100 kg of mesocarbon microspheres (D50 is 20.5 μm) and graphitization catalyst (SiO 2 ) 10kg mixed evenly, mixed with pitch powder 40kg in a kneading pot, kneaded at 160°C for 1 hour, after the kneading was finished, pressed into flakes (5mm) in a tablet machine, and crushed into particles with a particle size of less than 100 μm. Briquetting is formed. Under the protection of nitrogen, carbonize at 1500°C for 3 hours, then cool the reaction product to room temperature, and then carry out high-temperature catalytic graphitization at 3200°C for 48 hours to obtain a composite with a particle size D50 of 17.4 μm. The intermediate phase negative electrode material has a half-battery capacity of 370.0mAh / g and an initial efficiency of 95.6%.

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Abstract

The invention discloses a composite intermediate phase negative electrode material, a lithium ion secondary battery, a preparation method and application. The preparation method comprises the following step: carrying out catalytic graphitization treatment on a blocky mixture containing uncalcined green coke powder, mesocarbon microbead green pellets, a graphitization catalyst and an adhesive capable of being graphitized, wherein the particle size D50 of the uncalcined green coke powder is 1-50 [mu] m, and the mass ratio of the uncalcined green coke powder to the mesocarbon microbead green pellets is (0.25-1): 1. The composite intermediate-phase negative electrode material prepared by the method is large in discharge capacity and good in cycle performance; a prepared button cell has excellent comprehensive performance, the discharge capacity is 365 mAh/g or above, the cycle performance is good (300 cycles, the capacity is maintained to be greater than or equal to 90%), the safety is better (130 DEG C/60 minutes, explosion and expansion are avoided), the adaptability to electrolytes and other additives is better, the preparation method is simple and feasible, and the preparation method is suitable for industrial production.

Description

technical field [0001] The invention relates to a composite mesophase negative electrode material, a lithium ion secondary battery, a preparation method and application. Background technique [0002] The mesophase carbon graphitized product is an excellent negative electrode material for lithium-ion batteries. In recent years, lithium-ion batteries have been widely used in mobile phones, notebook computers, digital cameras and portable appliances. Lithium-ion batteries have excellent performances such as high energy density, high working voltage, small size, light weight, no pollution, fast charging and discharging, and long cycle life. They are ideal energy sources for development in the 21st century. Mesophase carbon, as the negative electrode material of lithium-ion secondary batteries, has the characteristics of low potential, good flatness, high specificity, high initial charge and discharge efficiency, and good processability. Theoretically LiC 6 The reversible lithi...

Claims

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Application Information

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IPC IPC(8): C01B32/205H01M4/587H01M10/0525
CPCC01B32/205H01M4/587H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 谢秋生董爱想陈然刘盼
Owner SHANGHAI SHANSHAN TECH CO LTD
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