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Method for preparing cathode material for high capacity lithium ion battery

A technology of lithium-ion batteries and negative electrode materials, which is applied in the direction of electrode manufacturing, etc., can solve the problems of powdering and deactivation of electrode materials, and achieve the effect of increased surface roughness and firm and tight interface

Inactive Publication Date: 2008-12-17
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of their alloying with lithium is accompanied by a significant volume change (increase of about 300%), which leads to pulverization and deactivation of the electrode material, so the capacity decays quickly, and has not been practically applied to commercial products.

Method used

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  • Method for preparing cathode material for high capacity lithium ion battery
  • Method for preparing cathode material for high capacity lithium ion battery
  • Method for preparing cathode material for high capacity lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh mesocarbon microspheres (76wt.%) and SnO 2 (24wt.%) of the mixture was 0.5 g in total, and after mechanical ball milling for 50 minutes, it was placed in a heating furnace and reacted at 800° C. for 40 minutes. The amount of oxygen introduced during the reaction is the starting SnO 2 3 times the oxygen content, the inert gas is N 2 , The amount of inert gas added is 5 times that of oxygen. The scanning electron micrographs of the samples after the reaction are shown (Figure 1(a)-(b)), and the SnO 2 Small particles are uniformly dispersed on the surface of carbon microspheres. The test results of the conventional lithium-ion battery negative electrode evaluation method show that the sample has a high specific capacity (>500mAh / g) and excellent cycle performance. For detailed data comparison, see ( image 3 ).

Embodiment 2

[0032] Weigh mesocarbon microspheres (56wt.%) and SnO 2 (44wt.%) of the mixture was 0.5 g in total, and after mechanical ball milling for 90 minutes, it was placed in a heating furnace and reacted at 950° C. for 40 minutes. The amount of oxygen introduced during the reaction is the starting SnO 2 3 times the oxygen content, the inert gas is N 2 , The amount of inert gas added is 7 times that of oxygen. After the reaction, the sample was tested by the conventional lithium-ion battery negative electrode evaluation method, and the results showed that the capacity was still above 450mAh / g after 30 cycles.

Embodiment 3

[0036] Weigh natural graphite balls (75wt.%) and Fe 2 o 3 (25wt.%) of the mixture was 0.5 g in total, and after mechanical ball milling for 90 minutes, it was placed in a heating furnace and reacted at 1500° C. for 20 minutes. The amount of oxygen introduced during the reaction is the starting Fe 2 o 3 The oxygen content is 2 times, the inert gas is Ar, and the addition amount of the inert gas is 15 times of oxygen. After the reaction, the sample was tested by the conventional lithium-ion battery negative electrode evaluation method, and the results showed that the capacity was still above 500mAh / g after 30 cycles.

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Abstract

The invention relates to the preparation technology of cathode materials for rechargeable secondary lithium-ion batteries and provides a method of preparing the cathode materials for high-capacity lithium-ion batteries. The lithium-ion battery utilizes the techniques of the in-situ carbothermic reduction reaction and the in-situ chemical reaction ball milling to prepare the uniformly-dispersed metal oxide / carbon composite cathode materials. The prepared composite cathode materials can remarkably increase the capacity of the lithium-ion batteries and have excellent cycle performance. The composite cathode materials prepared by the method make full use of high-capacity metal oxides, additionally, the metal oxides, in the form of small granules, are uniformly dispersed on the surface of the carbon-based matrix with high interface bonding strength, so that the volume change caused by the insertion and the extraction of lithium ions during the recharging process is well attenuated by the carbon-based matrix and the cycle performance is also kept excellent.

Description

Technical field: [0001] The invention relates to the preparation technology of the negative electrode material of the rechargeable secondary lithium ion battery, and provides a method for preparing the negative electrode material of the high capacity lithium ion battery. The invention can improve the capacity of the lithium ion battery and has excellent cycle performance. Background technique: [0002] Lithium-ion secondary battery has become a widely used power supply product due to its high monomer voltage, high energy and power density, long life, light weight, no memory effect, and no pollution. Its application fields mainly include various Portable electronic consumer goods (such as mobile phones, notebook computers, digital cameras, etc.); electric vehicles (EV) and hybrid electric vehicles (HEV); military weapons and equipment; aerospace fields, etc. Especially in recent years, with the application of electric vehicles, people have put forward higher performance requi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04
CPCY02E60/10
Inventor 成会明张宏立李峰刘畅闻雷英哲王作明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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