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Negative electrode material used for lithium battery and preparation method and application thereof

A technology for anode materials and lithium batteries, applied in nanotechnology for materials and surface science, battery electrodes, circuits, etc., can solve problems such as poor cycle performance of silicon anode materials, high delithiation potential, and breakage of silicon nanowires. Achieve the effects of improving kinetic and thermodynamic properties, high mechanical strength, and improving electrical conductivity

Active Publication Date: 2013-12-25
LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Therefore, one of the objectives of the present invention is to provide a negative electrode material for a lithium battery, which can overcome the problem that the silicon nanowire thin film electrode is easily broken from the root during charging and discharging. The capacity of the graphite negative electrode is low, the cycle performance of the silicon negative electrode material is poor, the reversible capacity is low, the delithiation potential is high and the defect of the Coulomb efficiency is low; Another purpose of the present invention is to provide a kind of preparation method and application of the negative electrode material for lithium battery , the preparation method mainly adopts the method of low-cost chemical etching, which overcomes the problem of using SiH 4 Disadvantages of high cost of preparing silicon nanowires by vapor deposition

Method used

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  • Negative electrode material used for lithium battery and preparation method and application thereof
  • Negative electrode material used for lithium battery and preparation method and application thereof
  • Negative electrode material used for lithium battery and preparation method and application thereof

Examples

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Embodiment 1

[0115] This example is used to illustrate the negative electrode material and its preparation method. Wherein, the negative electrode material is prepared by combining magnetron sputtering and chemical etching, which specifically includes the following steps:

[0116] (1) Put the commercial titanium metal target (99.9%) in the sputtering chamber; clean the substrate material quartz with acetone, alcohol and deionized water and fix it on the sample stage after thorough drying, and fix the sample stage In the sample preparation chamber of the magnetron sputtering instrument; vacuumize the sample preparation chamber to make the vacuum degree reach 10 -3 Pa, then the argon gas with 20sccm gas flow rate is passed to the sample preparation chamber, the DC power supply is turned on, the corresponding power is adjusted to be 80W and the preparation time is half an hour, and the dense titanium film deposited with a thickness of 500 nanometers is the conductive substrate material layer;...

Embodiment 2

[0130] This example is used to illustrate the negative electrode material and its preparation method. Similar to Example 1, this example uses a method combining magnetron sputtering and chemical etching to prepare the negative electrode material. The difference is that this example reduces the deposition time of the silicon film to 12 minutes, shortening the chemical etching time Time to 1 minute, the diameter of the columnar and / or fibrous micro-nano hairs in the obtained negative electrode material is 50 nanometers.

[0131] The charge-discharge curve of the simulated battery of embodiment 2 sample is as Figure 4 As shown, the test results are shown in Table 1.

Embodiment 3

[0133] This example is used to illustrate the negative electrode material and its preparation method. Similar to Example 1, this example uses a method combining magnetron sputtering and chemical etching to prepare the negative electrode material. The difference is that this example increases the deposition time of the silicon film to 20 hours and increases the chemical etching The time to 100 minutes, the diameter of the columnar and / or fibrous micro-nano hairs in the obtained negative electrode material is 10 microns.

[0134] The charge-discharge curve of the simulated battery of embodiment 3 sample is as Figure 4 As shown, the test results are shown in Table 1.

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Abstract

The invention relates to a negative electrode material used for a lithium battery and a preparation method and application thereof, the negative electrode material includes a conductive substrate material layer and a silicon based thin film material layer, the silicon based thin film material layer contains one or more components selected from the group consisting of silicon element, SiOX and silicon alloy, wherein, 0 < X =< 2; in the silicon based thin film material layer, silicon accounts for 10-100% of the weight of the silicon based thin film material layer; the silicon based thin film material layer is a thin film formed by regular and / or irregular columnar and / or fibrous micro nano naps, wherein the micro nano naps are connected with each other by root parts, and the root parts of the micro nano naps are connected with the conductive substrate material layer; gaps are existed among the micro nano naps, and the porosity among the micro nano naps is 2%-98%; the diameter size of the micro nano naps is 1 nm to 10 mum, and the thickness of the silicon based thin film material layer is 50 nm-10 mum.

Description

technical field [0001] The invention relates to a negative electrode material for a lithium battery, a preparation method and application thereof. Background technique [0002] With the rapid development of equipment portability and various electronic components, the demand for high-energy-density secondary batteries is increasing. Among them, lithium-ion secondary batteries have become the future of chemical power sources due to their high specific energy, light weight, and high operating voltage. Direction of development. [0003] At present, the negative electrode of lithium-ion secondary batteries mainly uses carbon materials, such as petroleum coke, carbon fiber, pyrolytic carbon, natural graphite and artificial graphite, etc., which were originally patented by Japan's SONY company in March 1989 and put into commercialization in 1992 ( See Bruno, Journal of the Electrochemical Society, Vol. 139, p. 2776, 1992). However, the negative electrode material made of carbon m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/134H01M4/1395B82Y30/00
CPCY02E60/10
Inventor 王艳红李泓刘尧平梅增霞王燕杜小龙
Owner LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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