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Soft carbon anode material for lithium-ion power and energy storage battery as well as preparation method and application of soft carbon anode material

A technology for energy storage batteries and anode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high impurities, low Coulombic efficiency, and low energy density of soft carbon anode materials, so as to improve cycle performance and enhance materials capacity and porosity improvement

Active Publication Date: 2015-01-07
JIXI BTR GRAPHITE IND PARK CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN103050699A discloses a soft carbon negative electrode material for a lithium ion battery and a preparation method thereof. The preparation method includes: mixing a catalyst with pitch and performing a carbonization thermal polycondensation reaction to obtain a mesophase pellet precursor; extracting and drying, and mixing with nitrogen and / or boron-containing compounds are mixed, and then carbonized to obtain a soft carbon negative electrode material with a capacity of more than 400mAh / g, but the first coulombic efficiency is low, below 84%.
The soft carbon negative electrode material for lithium-ion batteries prepared by this preparation method has high impurities and large self-discharge; the mixing step with nitrogen-containing and / or boron-containing compounds, doping with heteroatom boron and nitrogen, leads to the formation of a voltage platform and low energy density

Method used

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  • Soft carbon anode material for lithium-ion power and energy storage battery as well as preparation method and application of soft carbon anode material
  • Soft carbon anode material for lithium-ion power and energy storage battery as well as preparation method and application of soft carbon anode material
  • Soft carbon anode material for lithium-ion power and energy storage battery as well as preparation method and application of soft carbon anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] 1. Put heavy oil from the petroleum industry, ferric fluoride and nickel nitrate into the autoclave at a mass ratio of 100:10:2, heat up to 100°C, and stir at a speed of 60r / min for 10 hours.

[0078] 2. Raise the temperature to 380°C, feed in nitrogen, keep the pressure at 4MPa, stir and react at a speed of 40r / min for 2 hours; raise the temperature to 420°C, keep the pressure at 20MPa, and react at a speed of 120r / min for 2 hours, the system generates heat Polycondensation reaction to obtain the primary product of the mesophase.

[0079]3. Mix the mesophase primary product and toluene at a mass ratio of 1:2, heat up to 200°C, stir for 3 hours, filter and wash with ethanol to obtain the mesophase carbon microsphere precursor.

[0080] 4. Mix the precursor of mesophase carbon microspheres and nitric acid with a concentration of 10% at a mass ratio of 10:90, heat up to 120°C at a rate of 0.5°C / min, stir for 36 hours, and the stirring speed is 60r / min. Centrifugal washin...

Embodiment 2

[0085] 1. Add petroleum pitch, aluminum nitrate, nickel sulfamate, cobalt oxalate and cyclopentadienyl dicarbonyl iron into the autoclave according to the mass ratio of 100:0.02:0.1:5:0.22, raise the temperature to 180°C, and use 40r / min speed stirring for 30 hours.

[0086] 2. Raise the temperature to 320°C, feed in nitrogen, keep the pressure at 8MPa, stir and react at a speed of 100r / min for 0.4 hours; raise the temperature to 500°C, keep the pressure at 32MPa, and react at a speed of 180r / min for 18 hours, the system generates heat Polycondensation reaction to obtain the primary product of the mesophase.

[0087] 3. Mix the mesophase primary product and toluene at a mass ratio of 1:0.4, raise the temperature to 200°C, stir for 0.2 hours, filter and wash with acetone to obtain the mesophase carbon microsphere precursor.

[0088] 4. Mix the mesophase carbon microsphere precursor with 1% perchloric acid at a mass ratio of 45:45, raise the temperature to 160°C at a rate of 3...

Embodiment 3

[0093] 1. Add coal tar and ferrous oxalate into the autoclave at a mass ratio of 100:20, raise the temperature to 220°C, and stir at a speed of 140r / min for 0.1 hour.

[0094] 2. Raise the temperature to 260°C, feed nitrogen, keep the pressure at 10MPa, stir and react at a speed of 140r / min for 20 hours; raise the temperature to 570°C, keep the pressure at 15MPa, and react at a speed of 200r / min for 0.4 hours, the system generates heat Polycondensation reaction to obtain the primary product of the mesophase.

[0095] 3. Mix the mesophase primary product and quinoline at a mass ratio of 1:12, raise the temperature to 70°C, stir for 12 hours, filter and wash with ethanol to obtain the mesophase carbon microsphere precursor.

[0096] 4. The mesophase carbon microsphere precursor and the hydrogen peroxide with a concentration of 25% are in a mass ratio of 45:1, and the temperature is raised to 60°C at a rate of 15°C / min, and stirred for 30h at a stirring speed of 100r / min, using p...

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Abstract

The invention provides a soft carbon anode material for a lithium-ion power and energy storage battery as well as a preparation method and application of the soft carbon anode material. According to the preparation method, a low-concentration purifying reagent and a mesophase carbon microsphere precursor are stirred and mixed, so as to enable the low-concentration purifying reagent to react with impurities to generate water-soluble substances, and the water-soluble substances are washed by purified water, so that the impurity content is reduced, the product purity is improved, the carbon content is greater than 99.3%, and the self-discharge rate is obviously reduced; through low-temperature carbonization, and through surface activation modification of a material by a lithium-containing compound and / or an activating reagent, a dense film similar to an SEI (solid electrolyte interface) component is formed on the surface of the material, which facilitates the reduction of L<i+> consumed in the SEI film forming process during the charging and discharging process of the battery, thereby improving the initial coulombic efficiency and improving the cycle performance; the porosity is increased, lithium intercalating and de-intercalating active sites are increased, the capacity of the material is increased, and thus the energy density of the whole battery is increased.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to a soft carbon negative electrode material for lithium ion power and energy storage batteries, a preparation method and application thereof. Background technique [0002] With the development of science and technology and the improvement of living standards, the human demand for multifunctional portable electronic devices and electric vehicles is increasing. It has become an important task to study new electrode materials for lithium-ion batteries with high energy density, fast charging and discharging, long cycle life and low cost. Internationally important frontier fields. The negative electrode material is one of the important factors affecting the performance of lithium-ion batteries. In the prior art, graphite or modified graphite is generally used. However, its theoretical lithium intercalation capacity of 372mAh / g can no longer meet the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/0525
CPCH01M4/583H01M10/0525Y02E60/10
Inventor 汪福明李勇岳敏任建国黄友元
Owner JIXI BTR GRAPHITE IND PARK CO LTD
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