A kind of lithium ion battery negative plate and preparation method thereof, lithium ion battery

A technology of lithium ion battery and negative electrode sheet, which is applied to battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve problems such as cumbersome process, achieve simple process, ensure electron transmission capacity, save conductive agent and The effect of the use of the binder

Active Publication Date: 2016-08-17
深圳石墨烯创新中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process of using silicon to make negative plates is cumbersome and not suitable for actual industrial production.

Method used

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  • A kind of lithium ion battery negative plate and preparation method thereof, lithium ion battery
  • A kind of lithium ion battery negative plate and preparation method thereof, lithium ion battery
  • A kind of lithium ion battery negative plate and preparation method thereof, lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0015] Such as figure 1 Shown is the flow chart of the preparation method of the lithium-ion battery negative plate of the specific embodiment, and the preparation process includes the following steps:

[0016] S1) Prepare a graphene oxide solution with a concentration of 1-20 mg / mL.

[0017] Specifically, the improved Hummer's method can be used to prepare graphite oxide, and then accurately weigh a certain mass of graphite oxide, dissolve it in deionized water of a certain mass, and perform ultrasonic dispersion treatment to obtain a homogeneous aqueous solution of graphene oxide with a certain mass fraction, and then Mix it with absolute ethanol at a volume ratio of 1:1 to finally obtain a homogeneous solution of graphene oxide with a concentration of 1-20 mg / mL, which is designated as solution M.

[0018] S2) Prepare a mixed solution of nano-silicon particles and polymers; dissolve the nano-silicon particles and polymers in an aqueous alcohol solution to prepare the mixed...

experiment example 1

[0034] The first step: the preparation of a homogeneous solution of graphene oxide. Graphite oxide was prepared by modified Hummer's method. Accurately weigh 160 mg of graphene oxide, dissolve it in 80 mL of deionized water, and ultrasonically obtain a 2 mg / mL graphene oxide homogeneous solution, then mix it with absolute ethanol at a volume ratio of 1:1 to obtain a 1 mg / mL graphene oxide homogeneous solution. mL of a homogeneous solution of graphene oxide, denoted as solution M.

[0035] The second step: the preparation of the mixed solution of nano-silicon particles and polymer. Accurately weigh 40mg of nano-silicon particles (nano-silicon particles with a diameter of 30-100nm are used in this experimental example), dissolve 200mg of PVP in 20mL of alcohol aqueous solution, stir thoroughly for 4 hours, and sonicate for 1 hour to obtain a mixture of nano-silicon particles and polymers. The mixed solution is denoted as solution N1. That is, in the N1 solution, the concentra...

experiment example 2

[0044] Experimental Example 2: Compared with Experimental Example 1, the only difference between this experimental example is that in the third and fourth steps, the flow rate and spraying time of the spray are controlled so that the mass ratio of the final film A to film B1 is 1:7.5 . Finally, the maximum reversible specific capacity of the prepared negative electrode sheet was 1580mAh / g, the charging specific capacity (delithiation) after 100 cycles was 910mAh / g, and the capacity retention rate was 57.6%.

[0045] From the comparison of Experimental Example 1 and Experimental Example 2, it can be seen that when the mass ratio of film A to film B1 is adjusted, the capacity performance of the final negative electrode sheet is similar. The possible reason is that although the ratio of the coating mass of the film has changed, the mass fraction of the silicon material in the active material layer is almost the same (between 55-60%) due to the small amount remaining after the car...

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Abstract

The invention discloses a negative electrode piece of a lithium ion battery, a preparation method of the negative electrode piece and a lithium ion battery. The preparation method of the negative electrode piece of the lithium ion battery comprises the following steps of (1) preparing a graphene oxide solution with the concentration being 1-20mg / mL; (2) preparing a mixed solution of nano silicon particles and a polymer; (3) fixing a current collector on a receiving device by an electrostatic spraying mode, performing electrostatic spraying on the graphene oxide solution obtained in the step (1) and the mixed solution obtained in the step (2) in sequence to respectively obtain a layer of graphene oxide thin film and a layer of silicon-polymer thin film, and defining the two layers to be layers A and B; (4) repeatedly spraying the graphene oxide solution and the mixed solution to finally form a plurality of AB layer structures on the current collector; and (5) carbonizing the current collector covered with the multiple AB layer structures to obtain the negative electrode piece. According to the preparation method disclosed by the invention, the technology is simple and the cost is relatively low; furthermore, the prepared negative electrode piece is relatively high in capacity and can meet application requirements.

Description

【Technical field】 [0001] The invention relates to a lithium ion battery electrode sheet, in particular to a lithium ion battery negative electrode sheet and a preparation method thereof. 【Background technique】 [0002] Lithium-ion batteries are widely used in portable electronic devices, such as laptops, mobile phones, etc., because of their high energy density and long service life. At present, the negative electrode sheet of the commercialized lithium ion battery mainly adopts graphite material. However, the theoretical specific capacity of graphite is only 372mAh / g. In order to further improve the energy density and power density of the negative electrode of lithium-ion batteries, it is very important to develop new negative electrode materials. Since the theoretical capacity of silicon is as high as 4200mAh / g, and it is abundant in nature, there are solutions to apply silicon materials to the negative electrode of lithium-ion batteries. The general solution is to first...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/139
CPCH01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/364H01M4/366H01M10/0525Y02E60/10
Inventor 秦显营吴军雄张浩然李宝华贺艳兵杜鸿达杨全红康飞宇
Owner 深圳石墨烯创新中心有限公司
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