Pre-lithiatedanode material with high reversible capacity and preparation method of pre-lithiatedanode material

A negative electrode material and a pre-lithiation technology, which are applied in the field of pre-lithiated negative electrode materials and their preparation to achieve the effects of reducing agglomeration effect, improving cycle performance and ensuring cycle stability

Inactive Publication Date: 2019-03-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, more and more attention has been paid to the surface coating or modification of positive and negative materials. The materials used are Li 2 CO 3 , LiF, etc., and it has been proven that this method can effectively improve the electrochemical performance of lithium-ion battery materials, but there is still a lack of methods that can effectively combine lithium salt materials with active materials

Method used

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  • Pre-lithiatedanode material with high reversible capacity and preparation method of pre-lithiatedanode material
  • Pre-lithiatedanode material with high reversible capacity and preparation method of pre-lithiatedanode material
  • Pre-lithiatedanode material with high reversible capacity and preparation method of pre-lithiatedanode material

Examples

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Effect test

Embodiment 1

[0041] The SnO with high reversible capacity of this example 2 -Li 2 CO 3 -The preparation method of graphite composite material is as follows:

[0042] Mix pure tin dioxide, lithium carbonate and ordinary graphite powder with a particle size range of 1-3 μm, in which SnO 2 , Li 2 CO 3 The mass ratio of graphite and graphite is 70:5:25, adding quality is 2% dehydrated alcohol of abrasive material gross mass, adopts planetary ball milling method to carry out ball milling, wherein the mass ratio of ball and mixed powder is 40:1, ball milling time Be 30h; The concrete steps of described planetary ball grinding method are as follows:

[0043] (1) Load grinding balls and proportioned original powder in the ball mill jar;

[0044] (2) Vacuumize the ball mill tank through the vacuum valve, and then fill it with hydrogen to make the pressure in the ball mill tank reach 0.12Mpa;

[0045] (3) Turn on the power of the planetary ball mill, set the ball mill mode to "one-way interva...

Embodiment 2

[0052] The SnO with high reversible capacity of this example 2 -Li 2 CO 3 -The preparation method of graphite composite material, wherein SnO 2 , Li 2 CO 3 The mass ratio of graphite to graphite is 70:5:25, and the method of roller milling is adopted, the mass ratio of ball mass to powder mass is 6:1, the rotational speed of ball milling is 13.5Hz, and the time of ball milling is 100h. The concrete steps of described roller ball milling method are as follows:

[0053] (1) Load grinding balls and proportioned original powder in the ball mill jar;

[0054] (2) Vacuumize the ball mill tank through the vacuum valve, and then fill it with hydrogen to make the pressure in the ball mill tank reach 0.12Mpa;

[0055] (3) Turn on the power supply of the roller ball mill, and set the ball mill speed to 13.5Hz. The ball mill jar is fixed on the roller mill frame for roller milling.

[0056] The SnO prepared in this example 2 -Li 2 CO 3 - Graphite composite powder, conductive ag...

Embodiment 3

[0058] The Fe with high reversible capacity of this example 3 o 4 -Li 2 CO 3 -The preparation method of the graphite composite material, except that tin dioxide powder is replaced by ferric oxide powder, other steps and parameters refer to embodiment 1. The Fe prepared in this example 3 o 4 -Li 2 CO 3 - Graphite composite powder, conductive agent and binder are mixed and evenly coated on copper foil according to a certain mass ratio to make electrode sheets, and dried in vacuum. In an argon atmosphere glove box, lithium metal was used as a counter electrode to assemble a coin cell for testing. The test conditions are: the charge and discharge current density is 0.2A / g, and the charge and discharge cut-off voltage is 0.01V~3.0V. For the first charge and discharge curve obtained from the test, see Figure 8 , as shown in the figure, the first charge and discharge specific capacities of the composite materials prepared in this example are 733.9mAh / g and 992.2mAh / g respec...

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Abstract

The invention relates to a pre-lithiatedanode material with the high reversible capacity and a preparation method of the pre-lithiatedanode material. The pre-lithiatedanode material comprises a graphite-like carbon material, metallic oxide or silicon uniformly distributed on the pre-lithiatedanode material, and lithium carbonate; the first coulomb efficiency of the anode material is 5%-10% higherthan that of the corresponding pure metallic oxide or silicon anode material, and the capacity retention rate of the anode material is no less than 85% after cycling for 100-350 times. The preparationmethod includes the steps that the metallic oxide or silicon powder, lithium carbonate powder, the graphite-like carbon material and a grinding agent are stirred,mixed and subjected to ball-milling.According to the pre-lithiatedanode material with the high reversible capacity and the preparation method of the pre-lithiatedanode material, by adding the lithium carbonate, the irreversible capacityof the anode material in the initial charging and discharging process is lowered, and thus the first coulomb efficiency is improved; by adding the graphite-like carbon material, structural stabilityof the material in the reaction process and conductivity of an electrode material are improved; and according to the ball-milling method, the size of the anode material particlescan be refined in a short time, and the volume change of the anode material is buffered.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery manufacturing, and in particular relates to a pre-lithiated negative electrode material with high reversible capacity and a preparation method thereof. Background technique [0002] Vigorously developing electric vehicles is of great significance to solving problems such as mitigating deterioration, and developing lithium-ion batteries with high energy density and power density is the key to the development of electric vehicles. The biggest disadvantage of the current commercial carbon-based negative electrode materials is the low theoretical specific capacity, and the performance of lithium-ion batteries cannot be further improved only by improving the electrode material preparation process. Therefore, in order to improve the energy density and power density of lithium-ion batteries, it is imperative to study new lithium-ion battery anode materials. [0003] Compared with traditional...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/50H01M4/52H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/48H01M4/50H01M4/52H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 胡仁宗梁涛文刚鲁忠臣曾美琴朱敏
Owner SOUTH CHINA UNIV OF TECH
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