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Graphite and transitional metallic oxide composite cathode material and preparation method thereof

A transition metal and negative electrode material technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems that affect the practicality of transition metal oxides, poor conductivity of metal oxides, and severe volume changes, and achieve good electrochemical performance. The effect of low equipment investment and high capacity

Inactive Publication Date: 2013-01-30
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the poor conductivity of metal oxides and the drastic volume change during charge and discharge, their cycle performance is poor, which affects the practical application of transition metal oxides in lithium-ion batteries.
At present, although measures such as nanonization, porosity, and carbon coating have been taken to improve the cycle performance of transition metal oxides, it is still difficult to fundamentally overcome the shortcomings in their performance.

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  • Graphite and transitional metallic oxide composite cathode material and preparation method thereof
  • Graphite and transitional metallic oxide composite cathode material and preparation method thereof
  • Graphite and transitional metallic oxide composite cathode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1 prepares iron oxide / graphite composite negative electrode material by iron oxide and graphite

[0031] The preparation method is: use a balance to weigh 0.6g of iron oxide with a particle size of about 20nm, and 2.4g of graphite with a particle size of about 20μm, and grind them evenly in a mortar to obtain an iron oxide / graphite composite negative electrode material, and an aqueous solution prepared with 0.9g of glucose After mixing 10 ml evenly, dry at 105° C., then heat to 500° C. in a nitrogen atmosphere, and keep the temperature for 5 hours to obtain a composite negative electrode material coated with carbon on the surface.

[0032] The cycle performance of the iron oxide / graphite composite negative electrode material obtained in this embodiment is as follows: figure 2 As shown, the capacity of charging and discharging 85 times was measured at 0.1C rate to be 408.7mAh / g.

Embodiment 2

[0033] Example 2 Preparation of Iron Oxide / Graphite Composite Anode Material by Iron Oxide and Graphite

[0034] The preparation method is: use a balance to weigh 0.9g of iron oxide with a particle size of about 20nm, and 2.1g of graphite with a particle size of about 20μm, and grind them evenly in a mortar to obtain an iron oxide / graphite composite negative electrode material, and an aqueous solution prepared with 0.9g of glucose After mixing 10 ml evenly, dry it at 120°C, then heat it to 550°C in a nitrogen atmosphere, and keep it warm for about 5 hours to obtain a carbon-coated composite negative electrode material.

[0035] The battery assembled by the carbon-coated iron oxide / graphite composite negative electrode material obtained in this example has a cycle performance at a rate of 0.1C as follows: image 3 As shown, the capacity of charging and discharging 30 times is 497mAh / g.

[0036] The X-ray diffraction pattern of the carbon-coated iron oxide / graphite composite ne...

Embodiment 3

[0037] Example 3 Preparation of Iron Oxide / Graphite Composite Anode Material by Iron Oxide and Graphite

[0038] The preparation method is: use a balance to weigh 1.2g of iron oxide with a particle size of about 20nm, and 1.8g of graphite with a particle size of about 6μm, and grind them evenly in a mortar to obtain an iron oxide / graphite composite negative electrode material, and an aqueous solution prepared with 0.9g of glucose After mixing 10 ml evenly, dry at 105° C., then heat to 550° C. in a nitrogen atmosphere, and keep the temperature for 5 hours to obtain a carbon-coated composite negative electrode material. The battery assembled from this carbon-coated iron oxide / graphite composite negative electrode material has a capacity of 483mAh / g measured at 0.1C rate for 30 times of charge and discharge. Each charge and discharge cycle is carried out 10 times, and the capacity can reach 481.5, 463.4, 357.7, 287.4mAh g -1 .

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Abstract

The invention discloses a graphite and transitional metallic oxide composite cathode material. The technical problem caused by using graphite and transitional metallic oxide as cathode materials of lithium ion batteries is solved. The graphite and transitional metallic oxide composite cathode material is prepared by using graphite and transitional metallic oxide, and the mass ratio of the graphite to the transitional metallic oxide is 3-9: 1-7. The preparation method comprises the following steps of: weighing the graphite and the transitional metallic oxide; sufficiently grinding the graphite and the transitional metallic oxide; uniformly mixing the graphite and the transitional metallic oxide so as to obtain the graphite and transitional metallic oxide composite cathode material; and coating carbon on the surface of the graphite and transitional metallic oxide composite cathode material in the nitrogen atmosphere to obtain a composite cathode material with the surface coated with the carbon. The electrochemical performance of the composite cathode material with the surface coated with the carbon is high. The graphite and transitional metallic oxide composite cathode material has high conductivity; the capacity of the graphite and transitional metallic oxide composite cathode material is higher than that of a graphite cathode material; the rate capability of the graphite and transitional metallic oxide composite cathode material is higher than that of graphite; the change of the size of the transitional metallic oxide in charging and discharging processes can be effectively buffered owing to a loose graphite structure; and the graphite and transitional metallic oxide composite cathode material has good cycle performance and rate capability even if the surface of the graphite and transitional metallic oxide composite cathode material is not coated with the carbon.

Description

technical field [0001] The invention relates to a graphite-transition metal oxide composite negative electrode material and a preparation method thereof, belonging to the technical field of inorganic non-metallic materials. Background technique [0002] Graphite has a layered structure, and lithium ions are easily combined with carbon atoms in the interlayer to form an interlayer compound Li x C 6 (x≤1), so that lithium can be intercalated and extracted repeatedly, and the corresponding theoretical specific capacity is 372mAh / g, which is the mainstream negative electrode material for commercial lithium-ion batteries at present. The main advantages of graphite as a negative electrode material are good electronic conductivity, low charge and discharge potential, and high safety performance. The disadvantages are that the actual capacity is low (about 300-330mAh / g), and the rate performance is poor. Can not meet the current actual needs, especially the needs of power batterie...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/58
CPCY02E60/12Y02E60/10
Inventor 白玉俊亓永新伦宁唐瑞王晓航李彩霞李一凡
Owner SHANDONG UNIV
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