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Sand grinding modification method of lithium ion battery mineral negative electrode material

A lithium-ion battery and negative electrode material technology, applied in the field of electrochemical performance of lithium-ion batteries, can solve the problems of poor electronic conductivity, coarse particle size, and unsatisfactory electrochemical performance of zinc concentrate

Inactive Publication Date: 2019-04-19
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electronic conductivity of zinc concentrate is poor, the particle size is coarse, and it will be pulverized and deformed during charging and discharging, so its actual electrochemical performance is not ideal.

Method used

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  • Sand grinding modification method of lithium ion battery mineral negative electrode material
  • Sand grinding modification method of lithium ion battery mineral negative electrode material
  • Sand grinding modification method of lithium ion battery mineral negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) The zinc concentrate-1# sample was taken from a concentrator, and the Zn content was measured to be 52.99% (mass ratio).

[0019] (2) Use QM-WX4 type planetary ball mill to grind the zinc concentrate with 400 rpm for 6 hours, then grind it for 8 hours with PHE0.5 type horizontal sand mill with 1500 rpm for 8 hours to obtain micronano zinc concentrate Mine-1# sample, its BET specific surface is 28.41m 2 / g, scanning electron microscope (SEM) photo (see figure 1 ) shows that most of its particle size is less than 100nm, and there are aggregates with a particle size of about 400nm.

[0020] (3) Grinding and mixing the micronano zinc concentrate-1# sample prepared in (2) with acetylene black and polyvinylidene fluoride (PVDF) binder in a 7:2:1 mass ratio in an agate mortar, Add dropwise analytically pure N-methylpyrrolidone (NMP) 5 times the mass of the mixture, grind it into a uniform slurry, coat it on the surface of the copper foil and dry it in an oven at 80°C for...

Embodiment 2

[0023] Take the zinc concentrate-2# sample from a certain ore dressing plant, send and record its Zn content to be 45.12% (mass ratio), adopt the (2) method of embodiment 1 to obtain the micronano zinc concentrate-2# sample, its BET The specific surface area is 27.85m 2 / g, scanning electron microscope (SEM) photo (see Figure 4 ) shows that most of the particles have a particle size of less than 100nm, there are aggregates with a particle size of about 400nm, and there are also individual larger agglomerated particles. All the other steps are exactly the same as (3), (4) of embodiment 1, cyclic voltammetry and charge-discharge performance (see attached Figure 5 ) test results show that the micro-nano zinc concentrate-2# sample also has good electrochemical reaction reversibility, its first discharge specific capacity is 736.6mAh / g, and the specific capacity of the 20th cycle is 523.1mAh / g.

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Abstract

The invention discloses a sand grinding modification method of a lithium ion battery mineral negative electrode material. The method is characterized in that two stages of grinding, namely planetary ball grinding and sand grinding, are carried out on natural zinc concentrate to obtain a micro-nano zinc concentrate negative electrode material, wherein the particle size of the negative electrode material is less than 100 nm, moreover, agglomerates exist, and the BET specific surface area of the negative electrode material is larger than 27 m<2> / g; and an electrode is manufactured by using the negative electrode material, acetylene black and PVDF at the mass ratio of 7:2:1, a lithium battery is assembled, an electrochemical performance test shows that the micro-nano zinc concentrate negativeelectrode material has good electrochemical reaction reversibility, the reaction equilibrium potential is about 1.2 V (vs. Li / Li<+>), the first-time discharge specific capacity is 736 mAh / g or above,and the specific capacity of the 50th-time charge and discharge cycle is 513 mAh / g or above. According to the method, micro-nano crushing of the zinc concentrate can be easily realized, so that the electrochemical performance of the zinc concentrate used as the lithium ion battery negative electrode material is remarkably improved, and a relatively good practical application value is achieved.

Description

technical field [0001] The invention relates to a sand grinding modification of a lithium ion battery mineral negative electrode material, in particular to improving the electrochemical performance of the mineral negative electrode material used in a lithium ion battery through sand grinding. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high specific energy, and long life, and have been widely used in small portable electronic products. With the increasing demand for lithium batteries in the fields of electric vehicles and energy storage, high energy density, high safety, and low cost have become the main development direction of lithium-ion batteries. The negative electrode active materials currently used in commercial lithium-ion batteries include carbon, silicon carbon, and lithium titanate. its scope of application. Therefore, the research and development of new negative electrode materials with high specific capacity, high s...

Claims

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Application Information

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IPC IPC(8): B02C17/08B02C21/00H01M4/42H01M10/0525
CPCB02C17/08B02C21/00H01M4/42H01M10/0525Y02E60/10
Inventor 杨建文赵绚姜吉琼陈权启李延伟黄斌
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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