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Preparation method of nanometer hollow spherical shell-shaped high-rate-performance LaFeO3 lithium ion battery negative electrode material

A lithium-ion battery and anode material technology, applied in battery electrodes, nanotechnology, nanotechnology, etc., can solve problems such as inability to use on a large scale, and achieve the effects of easy control, easy availability of raw materials, and high purity

Inactive Publication Date: 2021-12-03
派尔森环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the past hundred years, although there have been more and more materials that can be used as anode materials for lithium-ion batteries, they all have various shortcomings and cannot be used on a large scale. Now the common and large-scale use is still carbon-based materials, titanium-based materials and transition metal oxides

Method used

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  • Preparation method of nanometer hollow spherical shell-shaped high-rate-performance LaFeO3 lithium ion battery negative electrode material
  • Preparation method of nanometer hollow spherical shell-shaped high-rate-performance LaFeO3 lithium ion battery negative electrode material
  • Preparation method of nanometer hollow spherical shell-shaped high-rate-performance LaFeO3 lithium ion battery negative electrode material

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Experimental program
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Effect test

Embodiment 1

[0048] Embodiment 1 A kind of LaFeO of nano-hollow spherical shell with high rate performance 3 Preparation method of lithium ion battery negative electrode material

[0049] The invention is a nano hollow spherical shell LaFeO with high rate performance 3 The preparation method of the lithium ion battery negative electrode material is prepared according to the following sequence of steps:

[0050] (11) La(NO 3 ) 3 ·6H 2 O and Fe(NO 3 ) 3 Dissolve in distilled water, add carbon spheres and stir to fully dissolve to obtain a yellowish-brown turbid liquid, denoted as A1, La(NO 3 ) 3 ·6H 2 The molar mass ratio of O to carbon spheres is 1:0.003;

[0051] Carbon spheres are carried out in sequence according to the following steps:

[0052] (I) Glucose was dissolved in distilled water to form a glucose solution with a mass concentration of 0.1 g / mL, stirred by magnetic force for 0.5 h, and recorded as solution a;

[0053] (II) Pour solution a into a polytetrafluoroethylen...

Embodiment 2-4

[0061] Example 2-4 LaFeO with nanometer hollow spherical shell and high rate performance 3 Preparation method of lithium ion battery negative electrode material

[0062] Embodiments 2-4 are respectively a kind of LaFeO with nano hollow spherical shell and high rate performance 3 The preparation method of the lithium ion battery negative electrode material, the preparation process is similar to that of Example 1, the only difference is that the corresponding technical parameters in the preparation process are different, see the table below for details.

[0063]

[0064]

Embodiment 5

[0065] Embodiment 5 performance test

[0066] The LaFeO prepared by embodiment 1 3 Negative electrode material and the granular LaFeO prepared by existing preparation method (embodiment 6) 3 Apply the existing technology to prepare the negative electrode of lithium-ion battery, and assemble the battery for electrochemical performance test. For the specific test results, see figure 2 with image 3 .

[0067] figure 2 is granular LaFeO 3 and nanoshell-like LaFeO 3 Respectively as the life cycle diagram of the lithium-ion battery negative electrode at a current density of 500mA / g, it can be seen from the figure that the spherical shell-shaped LaFeO 3 Under the current density of 500mA / g, the average discharge specific capacity of the material is about 750mAh / g, and the spherical shell LaFeO 3 The discharge specific capacity of the battery is initially 640mAh / g, then decays and then increases, and finally stabilizes at around 850mAh / g. This is because some materials faile...

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Abstract

The invention discloses a preparation method of a nanometer hollow spherical shell-shaped high-rate-performance LaFeO3 lithium ion battery negative electrode material. The preparation method comprises the following steps: dissolving a lanthanum source, an iron source and carbon spheres together, performing ultrasonic dispersion and stirring twice, alternately washing a product with absolute ethyl alcohol and distilled water, conducting centrifuging, drying a centrifuged product at 85-95 DEG C for 8-10 hours, calcining the dried product in a muffle furnace in a nitrogen atmosphere, and carrying out natural cooling along with the furnace after calcining to obtain the nanometer hollow spherical shell-shaped LaFeO3 negative electrode material. The preparation method is simple, the process of the method is easy to control, raw materials are low in price and easy to obtain, and a preparation period is short; the prepared LaFeO3 is of a nanometer hollow spherical shell structure and has a perovskite type structure, the particle sizes of particles are about 150 nm, and the LaFeO3 serving as the lithium ion battery negative electrode material has excellent rate capability and long-life high-capacity cycle stability.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium-ion batteries, and relates to a nano-hollow spherical shell-shaped LaFeO with high rate performance 3 A method for preparing a negative electrode material for a lithium ion battery. Background technique [0002] Anode materials are one of the important components of lithium-ion batteries. During the charging and discharging process of the battery, the negative electrode plays the function of storing and releasing energy. Negative electrode materials account for about 20% of the manufacturing cost of lithium-ion batteries, which play a vital role. Excellent negative electrode active material materials should have the following characteristics: [0003] (1) Under a specific voltage, there is a large amount of space for lithium ions to be inserted in the lattice structure, so that the lithium-ion battery can have a higher specific capacity. [0004] (2) The stabili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00H01M4/485H01M4/525H01M10/0525B82Y30/00B82Y40/00
CPCC01G49/00H01M4/525H01M4/485H01M10/0525B82Y30/00B82Y40/00C01P2004/34C01P2004/62C01P2004/04C01P2002/72C01P2006/40Y02E60/10
Inventor 李毅李虎林蔡建荣晏卫荣郑成王宇李超宁
Owner 派尔森环保科技有限公司
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