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High-rate graphite negative electrode material, preparation method thereof and lithium ion battery

A graphite negative electrode, high-rate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor fast charging ability, achieve the effect of improving fluidity, increasing layer spacing, and increasing lithium storage junctions

Active Publication Date: 2018-04-20
CALB CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-rate graphite negative electrode material, thereby solving the problem of poor fast charging ability existing in existing graphite negative electrode materials

Method used

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  • High-rate graphite negative electrode material, preparation method thereof and lithium ion battery
  • High-rate graphite negative electrode material, preparation method thereof and lithium ion battery
  • High-rate graphite negative electrode material, preparation method thereof and lithium ion battery

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Embodiment 1

[0033] The high-magnification graphite negative electrode material of this embodiment includes a graphite core and a hard carbon material layer doped on the surface of the graphite core, the hard carbon material layer is doped with lithium nitride, and the thickness of the hard carbon material layer is 100 nm.

[0034] The preparation method of the high-magnification graphite negative electrode material of the present embodiment adopts the following steps to prepare:

[0035] 1) Add 5g of phenolic resin to 500mL of ethanol, disperse evenly, add 0.5g of passivated lithium powder, and disperse evenly again to obtain the coating solution; then add 100g of natural graphite to the coating solution and mix evenly, and prepare the precursor by spray drying body particles;

[0036] 2) Under a nitrogen atmosphere, the precursor particles are reacted with nitrogen gas by EDM to prepare a lithium nitride doped precursor; the power of the electric spark is 750W, the voltage is 100V, and t...

Embodiment 2

[0040] The high-magnification graphite negative electrode material of this embodiment includes a graphite core and a hard carbon material layer doped on the surface of the graphite core, the hard carbon material layer is doped with lithium nitride and element S, and the thickness of the hard carbon material layer is 300nm .

[0041] The preparation method of the high-magnification graphite negative electrode material of the present embodiment adopts the following steps to prepare:

[0042] 1) Add 1g of epoxy resin to 500mL of ethanol, disperse evenly, add 0.1g of passivated lithium powder, and disperse evenly again to obtain the coating solution; then add 100g of natural graphite to the coating solution and mix evenly, and prepare by spray drying Precursor particles;

[0043] 2) Under a nitrogen atmosphere, the precursor particles are reacted with nitrogen gas by EDM to prepare a lithium nitride doped precursor; the power of the electric spark is 600W, the voltage is 80V, and t...

Embodiment 3

[0047] The high-magnification graphite negative electrode material in this embodiment includes a graphite core and a hard carbon material layer doped on the surface of the graphite core, the hard carbon material layer is doped with lithium nitride, and the thickness of the hard carbon material layer is 500 nm.

[0048] The preparation method of the high-magnification graphite negative electrode material of the present embodiment adopts the following steps to prepare:

[0049] 1) Add 10g of furfural resin to 500mL of ethanol, disperse evenly, add 1g of passivated lithium powder, and disperse evenly again to obtain the coating solution; then add 100g of natural graphite to the coating solution and mix evenly, and prepare the precursor by spray drying particles;

[0050] 2) Under a nitrogen atmosphere, the precursor particles are reacted with nitrogen by EDM to prepare a lithium nitride doped precursor; the power of the electric spark is 800W, the voltage is 120V, and the output ...

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Abstract

The invention relates to a high-rate graphite negative electrode material, a preparation method thereof and a lithium ion battery. The high-rate graphite negative electrode material comprises a graphite inner core and a hard carbon material layer, wherein the hard carbon material layer wraps a surface of the graphite inner core and is doped with lithium nitride. In the high-rate graphite negativeelectrode material provided by the invention, doping modification on the hard carbon material is performed by the lithium nitride, on one hand, a structure relation between the inner core and a coating layer can be built by lithium hydrophilcity of the inner core and the hard carbon material, and the hydrophilcity and the structural stability of the inner core and the coating layer are improved; and on the other hand, lattice defect can be formed in a carbon layer by lithium nitride doping, the electron mobility is improved, lithium storage combination points are increased, meanwhile, layer distance of a carbon-based material also can be expanded, and the lithium ion migration rate is improved. The graphite negative electrode material has the characteristics of good structural stability, large layer distance, many lithium storage combination points and rapid lithium ion and electron transmission speed, and the rapid charge capability of the lithium ion battery can be improved to a great extent.

Description

technical field [0001] The invention belongs to the field of preparation of graphite-based negative electrode materials, and in particular relates to a high-magnification graphite negative electrode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] With the rapid development of electric vehicles, lithium-ion batteries with high energy density and fast charging and discharging speed are increasingly favored by the market. The negative electrode material is an important factor restricting the improvement of the fast charging capacity of lithium-ion batteries. At present, the market-oriented negative electrode materials are mainly graphite materials. Although it has certain advantages in terms of structural stability, structural order, cost, and cycle performance, the small layer spacing of the material itself determines the rate charging of graphite negative electrodes. The discharge capacity is deviated, and there is a risk of "...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/587H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 赵晓锋仝俊利高娇阳李利淼宋文锋怀永建
Owner CALB CO LTD
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