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Lithium ion battery cathode material prepared by blue carbon solid waste, and preparation method of lithium ion battery cathode material

A lithium-ion battery, solid waste technology, applied in battery electrodes, carbon preparation/purification, circuits, etc., can solve the problems of high cost, complicated material preparation process, unfavorable commercialization, etc., and achieve low cost and good cycle performance. Effect

Inactive Publication Date: 2012-08-15
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The common problem faced by the above two patents is that the preparation process of the material is relatively complicated, which leads to high cost and is not conducive to the requirements of commercialization

Method used

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  • Lithium ion battery cathode material prepared by blue carbon solid waste, and preparation method of lithium ion battery cathode material
  • Lithium ion battery cathode material prepared by blue carbon solid waste, and preparation method of lithium ion battery cathode material
  • Lithium ion battery cathode material prepared by blue carbon solid waste, and preparation method of lithium ion battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Select semi-coke powder with particle size below 3 mm, and ball mill it in an agate ball mill jar for 5 hours according to the mass ratio of ball to material 4:1. A part of the ball-milled powder was mixed with NaOH at a mass ratio of 1:1 and then calcined at 850°C for 1.5 hours under the protection of argon, then rinsed with hot deionized water until neutral and then dried at 60°C. The content of impurities before and after roasting is shown in Table 1, and the content of SiO2 is significantly reduced after roasting.

[0037] Alkali-roasted and unroasted semi-coke powders are respectively doped with a certain amount of boron powder and then heat-treated in a high-temperature furnace. figure 1 It is the XRD pattern of original blue carbon. It can be seen from the curve that there is a large peak package at about 25° in the original blue carbon XRD pattern, indicating that blue carbon is amorphous carbon. At the same time, the XRD pattern contains a large number of impur...

Embodiment 2

[0039] Add 6% conductive agent Super-p (conductive carbon black) to the high-temperature-treated blue carbon powder and mix it with the binder PVDF (polyvinylidene fluoride) according to the mass ratio of 84:6:10 to prepare a slurry (viscosity The binder PVDF is pre-dissolved in N-methylpyrrolidone before use, and is configured as a 2% solution), and evenly coated on the copper foil, and then dried in a vacuum environment at 70 ° C for 24 hours to prepare a negative electrode for lithium-ion batteries pole piece. With lithium sheet as the counter electrode, 1mol / L LiPF 6 The EC (hexyl carbonate) + DMC (dimethyl carbonate) (volume ratio 1:1) solution was used as the electrolyte, and the battery separator model celgard2400 was assembled into a button battery in a glove box filled with argon.

[0040] Figure 3(a) and (b) are the electrochemical performance curves of the battery assembled with blue carbon after simple ball milling. Its initial capacity is high, and the lithium in...

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Abstract

The invention relates to a preparation technology of a lithium ion battery cathode material, and in particular relates to a lithium ion battery cathode material prepared by blue carbon solid waste through a certain treatment technology. The preparation process mainly comprises pretreatment of raw materials, catalyst doping treatment, high-temperature graphitization treatment and the like. After being treated by the preparation method provided by the invention, the maximum discharge capacity of blue carbon reaches 346mAh.g<-1>, and the coulomb efficiency is 80%; and after circulation is carried out for 320 times, the capacity is maintained to be 316mAh.g<-1>, and the capacity maintenance rate is 91%.

Description

Technical field: [0001] The invention relates to the field of lithium-ion batteries, in particular to a lithium-ion battery negative electrode material prepared from semi-coke coke powder solid waste and a preparation method thereof. Background technique: [0002] With the rapid development of today's world economy, energy crisis and environmental problems have increasingly become two urgent problems facing human beings, and the development of resource-saving and environment-friendly new energy technologies has increasingly become a major issue. Lithium-ion batteries have attracted much attention because of their environmental friendliness, high energy density, and long cycle life. At present, most of the lithium-ion anode materials used are graphite materials. However, graphite materials prepared by traditional methods have higher charging Discharge capacity, but the rate performance is poor, and the compatibility with the electrolyte is not very good, the long-term charge ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02H01M4/04H01M4/1393C01B32/05
CPCY02E60/122Y02E60/10
Inventor 柳永宁朱杰武江行国程晓华
Owner XI AN JIAOTONG UNIV
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