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Malposition lithium iron silicate and preparation method thereof

A technology of lithium iron silicate and silicate, which is applied in the field of high-performance lithium iron silicate cathode materials to achieve low ion migration activation energy, improve charge-discharge cycle performance, and increase reversible capacity.

Inactive Publication Date: 2016-07-13
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen that the above schemes can hardly do anything about the voltage problem that limits the capacity

Method used

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  • Malposition lithium iron silicate and preparation method thereof
  • Malposition lithium iron silicate and preparation method thereof
  • Malposition lithium iron silicate and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Weigh lithium acetate, iron citrate and tetraethyl orthosilicate in deionized water at a molar ratio of 1.8:1.1:1, and add citric acid equal to the iron source as a complexing agent. Stir for about 12 hours to form a gel, then vacuum dry at 50°C for 12 hours, and continue aging at 90°C for 12 hours. Grinding and pulverizing the obtained xerogel, then pre-calcining in air at 300°C for 2 hours, and continuing to calcining at 650°C under nitrogen atmosphere for 6 hours, after cooling, Li 1.8 Fe 1.1 SiO 4 product. figure 2 The X-ray diffraction pattern of the obtained product is given, from which it can be seen that the obtained material basically maintains the original silicate structure; image 3 It is the electron micrograph of the obtained product, the material is a porous structure, and the particle size is about 50nm; Figure 4 It is the charge-discharge curve diagram of the obtained product, and the actual discharge capacity of the Li / Fe dislocation m...

Embodiment 2

[0023] Example 2: Weigh lithium acetate, ferric citrate and tetraethyl orthosilicate in deionized water at a molar ratio of 1.6:1.2:1, and add citric acid equal to the iron source as a complexing agent. Stir for about 12 hours to form a gel, then vacuum dry at 50°C for 12 hours, and continue aging at 90°C for 12 hours. Grinding and pulverizing the obtained xerogel, then pre-calcining in the air at 260°C for 1 hour, and continuing to calcining at 700°C for 12 hours under an inert nitrogen atmosphere, and obtaining Li 1.6 Fe 1.2 SiO 4 product. figure 2 The X-ray diffraction pattern of the obtained product is given, from which it can be seen that the obtained material basically maintains the original silicate structure; the actual discharge capacity of the Li / Fe dislocation material reaches 188mAhg -1 .

Embodiment 3

[0024] Example 3: Weigh lithium acetate, ferric citrate and tetraethyl orthosilicate in deionized water at a molar ratio of 1.4:1.3:1, and add tartaric acid equal to the iron source as a complexing agent, and stir at 60°C The gel was formed in about 12 hours, then vacuum dried at 60°C for 12 hours, and aged at 80°C for 24 hours. Grinding and pulverizing the obtained xerogel, then pre-calcining in air at 320°C for 1 hour, and continuing to calcining at 750°C in an inert nitrogen atmosphere for 6 hours, and then naturally cooling to obtain Li 1.4 Fe 1.3 SiO 4 product. figure 2 The X-ray diffraction pattern of the obtained product is given, from which it can be seen that the obtained material basically maintains the original silicate structure; the actual discharge capacity of the Li / Fe dislocation material reaches 192mAhg -1 .

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Abstract

The invention provides a malposition lithium iron silicate and a preparation method thereof and discloses a high-performance lithium ion battery positive electrode material lithium iron silicate. The chemical formula of the material is Li2-2xFe1+xSiO4 (x is greater than 0 and less than or equal to 0.5), and the material is of a common silicate crystal structure. The invention further discloses a method for preparing the lithium iron silicate. The method comprises the following steps: uniformly mixing compounds containing a lithium source, an iron source and a silicon source; and then calcinating in the presence of an inert gas, thereby obtaining the lithium iron silicate material. The lithium iron silicate material has matched reaction electron number and ion number, is capable of solving the problem of cation shuffling in a circulating process and thus has relatively high charge-discharge capacity and stable cycle performance.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a high-performance lithium iron silicate cathode material for lithium ion batteries. Background technique [0002] With the increasing demand for high-energy lithium-ion batteries, finding high-energy-density battery cathode materials has become the focus of researchers around the world. In recent years, silicate materials with polyanionic structures such as Li 2 FeSiO 4 , Li 2 MnSiO 4 It has attracted much attention due to its high energy density. These silicate materials can theoretically deintercalate two lithium ions, and the specific capacity is as high as 330mAhg -1 , which is twice that of the current commercial cathode material. Thanks to Li 2 MnSiO 4 During cycling, the structure gradually becomes amorphous and loses most of its electrochemical characteristics. Therefore, the Li 2 FeSiO 4 It is the most promising material in the silicate cathode. [0003] ...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/58H01M10/0525Y02E60/10
Inventor 倪江锋王文聪李亮
Owner SUZHOU UNIV
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