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Carbon anode material for high-power lithium ion battery and preparation method of carbon anode material

A carbon anode material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high cost, can not meet the low cost of power-type lithium-ion batteries, etc., achieve easy storage, and improve rate performance. , the effect of reducing costs

Active Publication Date: 2016-05-04
CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of organic substances with high lithium ion conductivity as surface modifiers has the problem of high cost, which cannot meet the requirements of low cost for power lithium ion batteries.

Method used

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  • Carbon anode material for high-power lithium ion battery and preparation method of carbon anode material
  • Carbon anode material for high-power lithium ion battery and preparation method of carbon anode material
  • Carbon anode material for high-power lithium ion battery and preparation method of carbon anode material

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preparation example Construction

[0025] The preparation method of a kind of high-power type lithium-ion battery carbon negative electrode material of the present embodiment comprises the following steps:

[0026] Will Li 2 B 4 o 7 The aqueous solution is mixed with the carbon anode material to make the Li 2 B 4 o 7 The aqueous solution is infiltrated into the surface pores of the carbon negative electrode material and then dried and calcined; the process is simple and the cost is low.

[0027] In this example, the Li 2 B 4 o 7 The aqueous solution and the carbon negative electrode material are mixed and stirred at a temperature of 50-200°C; this temperature ensures that Li 2 B 4 o 7The aqueous solution fully penetrates into the carbon negative electrode material, which promotes the generation of Li on the surface of the carbon negative electrode particles. + De-intercalated solid electrolyte interface (SEI) membranes.

[0028] In this embodiment, the drying temperature is 50-200° C., and the calci...

Embodiment 1

[0034] LiOH·H 2 O and H 3 BO 3 According to Li 2 B 4 o 7 The molar ratio of Li and B is 1:2, dissolved in deionized water, the concentration of the mixed solution is 1.0mol / L; at a temperature of 80°C, press Li 2 B 4 o 7 : The mass percentage of graphite is 1:99, after adding artificial graphite, use a strong stirrer to fully stir for 2 hours, dry and evaporate water at a temperature of 100°C, and calcinate the dried mixture in a tube furnace at a temperature of 500°C and keep it warm After 10 hours, after cooling with the furnace, Li 2 B 4 o 7 (mass percentage 1%) modified artificial graphite. The modified artificial graphite was used as the negative electrode material to assemble a R2032 button cell, and the electrochemical performance was tested.

Embodiment 2

[0036] LiOH·H 2 O and H 3 BO 3 According to Li 2 B 4 o 7 The molar ratio of Li and B is 1:2, dissolved in deionized water, the concentration of the mixed solution is 1.0mol / L; at a temperature of 80°C, press Li 2 B 4 o 7 : The mass percentage of graphite is 3:97 After adding artificial graphite, use a strong stirrer to fully stir for 2 hours, dry and evaporate water at a temperature of 100°C, and calcinate the dried mixture in a tube furnace at a temperature of 500°C and keep it warm for 10 hours, after cooling with the furnace, Li 2 B 4 o 7 (3% by mass) modified artificial graphite. The physical properties of the modified artificial graphite were tested; at the same time, the modified artificial graphite was used as the negative electrode material to assemble a R2032 button battery to test the electrochemical performance.

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Abstract

The invention discloses a carbon anode material for a high-power lithium ion battery. The carbon anode material forms a compound with the mass ratio of the carbon anode material to Li2B4O7 being (80:20)-(99.5:0.5) through modification by Li2B4O7. Cheap Li2B4O7 is used for modifying the surface of the carbon anode material, the cost is substantially reduced, the Li2B4O7 modified carbon anode material facilitates forming of an SEI film with high lithium-ion conductivity in the charge-discharge cycle process, the rate capability of the carbon anode material is substantially improved, and the adopted modifying substance Li2B4O7 has the advantages of low cost, absence of toxicity and easiness in storage.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion secondary batteries, in particular to a carbon negative electrode material for high-power lithium ion batteries and a preparation method thereof. Background technique [0002] Due to the advantages of low charging and discharging platform, high cycle capacity and relatively low price, graphite carbon materials have been commercialized as lithium-ion battery anode materials in the practical stage of lithium-ion batteries. For a long time, lithium-ion batteries using graphite carbon materials as negative electrodes have been basically used as power sources for electronic products that require lower current density. The disadvantage of poor rate performance of graphite carbon materials has been ignored in practical applications. In recent years, with the improvement of environmental protection awareness on a global scale, governments of various countries have increased supp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M10/0525
CPCH01M4/587H01M10/0525Y02E60/10
Inventor 刘昊刘国标刘焕明梅军
Owner CHENGDU SCI & TECH DEV CENT CHINA ACAD OF ENG PHYSICS