Preparation method of modified natural graphite for lithium ion battery

A lithium-ion battery and natural graphite technology, which is applied in the field of lithium-ion battery negative electrode material processing, can solve the problems of voids and spherical natural graphite being difficult to achieve uniform coating, achieve large diffusion coefficient, enhance rate performance and cycle performance, and enhance fast The effect of charging

Inactive Publication Date: 2019-09-06
DONGGUAN KAIJIN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a preparation method of modified natural graphite for lithium-ion batteries, aiming at solving the difficulty in achieving a uniform coating of a layer of soft carbon on the outside of spherical natural graphite in the prior art. Technical problems with cladding and obvious voids inside

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  • Preparation method of modified natural graphite for lithium ion battery

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Embodiment 1

[0031] The preparation method of modified natural graphite for described lithium ion battery comprises the following steps:

[0032] (1) The flaky graphite particles are mixed with modifier particles, and the modifier granules are medium and low temperature asphalt; the mass percent of the modifier is 5%; the flaky graphite particles are 100 mesh sieves ; Flake graphite particles and modifier particles are mixed through a VC mixer; the mixing time is 10 minutes; the speed of the VC mixer is 3r / min;

[0033] (2) Put the mixture obtained in step (1) into a container and then place it in a carbonization furnace. Under a nitrogen atmosphere, raise the temperature in the carbonization furnace to 100° C. at a rate of 3° C. / min;

[0034] (3) The flaky graphite particles obtained in step (2) are sent to the vibration mill, the screw feeding frequency of the vibration mill is 1Hz, the host frequency is 20Hz, and the classification frequency is 10Hz; the sphericity of the flaky graphite...

Embodiment 2

[0036] The preparation method of modified natural graphite for described lithium ion battery comprises the following steps:

[0037] (1) The flaky graphite particles are mixed with modifier particles, and the modifier particles are high-temperature pitches; the modifier mass percent is 25%; the flaky graphite particles are 100 mesh sieves; Shaped graphite particles and modifier particles are mixed through a VC mixer; the mixing time is 20 minutes; the speed of the VC mixer is 100r / min;

[0038] (2) Put the mixture obtained in step (1) into a container and then place it in a carbonization furnace. Under vacuum conditions, raise the temperature in the carbonization furnace to 250° C. at a rate of 3° C. / min;

[0039] (3) the flaky graphite particle of step (2) gained is sent to vibratory mill, and the screw feeding frequency of vibratory mill is 3Hz, and main frame frequency is 50Hz, and classifying frequency is 30Hz; The sphericity of flaky graphite particle is adjusted to 80 %...

Embodiment 3

[0041] The preparation method of modified natural graphite for described lithium ion battery comprises the following steps:

[0042] (1) The flaky graphite particles are mixed with modifier particles, and the modifier particles are cationic emulsified pitch; the modifier mass percent is 30%; the flaky graphite particles are 100 mesh sieves; The flaky graphite particles and the modifier particles are mixed through a VC mixer; the mixing time is 40 minutes; the speed of the VC mixer is 800r / min;

[0043] (2) Put the mixture obtained in step (1) into a container and then place it in a carbonization furnace. Under vacuum conditions, raise the temperature in the carbonization furnace to 250° C. at a rate of 3° C. / min;

[0044] (3) the flaky graphite particle of step (2) gained is sent to vibratory mill, and the screw feeding frequency of vibratory mill is 5Hz, and main machine frequency is 70Hz, and classifying frequency is 50Hz; The sphericity of flaky graphite particle is adjuste...

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Abstract

The invention discloses a preparation method of modified natural graphite for a lithium ion battery. The method comprises the following steps that 1, scaly graphite particles are mixed with modifier particles, wherein the mass percentage of a modifier is 5-30%; 2, a mixture obtained in step 1 is loaded in a container and then placed in a carbonization furnace, and the temperature in the carbonization furnace is raised to 100-250 DEG C under a nitrogen atmosphere or vacuum condition; 3, the scaly graphite particles obtained in step 2 are sent to a vibromill, by means of the vibromill, the degree of sphericity of the scaly graphite particles is adjusted. Accordingly, by liquefying the modifier and making a gap of the natural spherical graphite filled with the liquefied modifier, the structure stability of the spherical graphite obtained after rolling is enhanced, and then liquid phase conduction of a pole piece is enhanced; the rate capability and cycle performance of the pole piece areenhanced, internal soft carbon and hard carbon materials have the large diffusion coefficient, internal diffusion of lithium ions is facilitated, and then the rapid charging performance is enhanced.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery anode material processing, in particular to a preparation method of modified natural graphite for lithium-ion batteries. Background technique [0002] Compared with artificial graphite, natural spherical graphite for lithium-ion batteries has a greater cost advantage, but there are obvious disadvantages such as poor cycle and poor dynamic performance, because spherical graphite is made of natural flake graphite through spheroidization. In the prior art, a layer of soft carbon is generally coated on the outside of spherical natural graphite. This method is difficult to achieve uniform coating. After carbonization, natural graphite is often difficult to compact, and the spherical graphite formed by further spheroidization has obvious voids inside. Therefore, it is necessary to propose a new preparation method to fill the gaps of natural spherical graphite, strengthen the structural stabi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/21H01M4/583H01M10/0525
CPCC01B32/21H01M4/583H01M10/0525Y02E60/10
Inventor 仰永军汤占磊晏荦
Owner DONGGUAN KAIJIN NEW ENERGY TECH
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