Lithium ion battery cathode material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of lower operating voltage platform of lithium ion batteries, no lithium ion insertion and insertion performance, poor cycle performance, etc. Excellent battery cycle performance, improved energy density, and a wide range of charge and discharge voltages

Active Publication Date: 2015-07-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the discharge platform of titanate is as high as 1.55V, which reduces the working voltage platform of lithium-ion batteries and limits its application.
Transition metal oxides can obtain considerable reversible capacity as anode materials for lithium-ion batteries, but their cycle performance is poor, and the mechanism of reactive lithium storage needs further study.
Patoux and Masquelier studied the performance of Li2TiSiO5 with α-VPO5 structure as an electrode for Li-ion batteries, (cf.: Sebastien Patoux and Christian Masquelier. Lithium Insertion into Titanium Phosphates, Silicates, and Sulfates. Chem Mater. 2002, 14, 5057 5068,) they found that the material does not have lithium ion insertion and intercalation properties, and is not suitable for lithium ion battery electrodes

Method used

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  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof

Examples

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Embodiment 1

[0029] A kind of negative electrode material of lithium ion battery of the present invention, its chemical formula is Li 2 TiSiO 5 , the reversible capacity of the charge and discharge process is greater than 180mAh / g, the platform of the delithiation process is 0.68V, the platform of the lithium insertion process is 0.35V, the charge and discharge voltage range is 0.01-2.0V, and the specific capacity of the first charge is 211.2mAh / g.

[0030] A preparation method of the lithium-ion battery negative electrode material of the present embodiment comprises the following steps: taking 8.1790 g of tetrabutyl titanate and 5.053 g of tetraethyl orthosilicate and dissolving them in 200 ml of ethanol, and then adding 3.5138 g of Triethanolamine forms solution A. Weigh 4.9998g of lithium acetate and dissolve it in a mixed solution of 100ml of ethanol and 5ml of water to form solution B. Slowly add A to the mixed solution of B during the process of constant stirring to obtain a white ...

Embodiment 2

[0033] A kind of negative electrode material of lithium ion battery of the present invention, its chemical formula is Li 2 TiSiO 5 , the reversible capacity of the charge and discharge process is greater than 180mAh / g, the platform of the delithiation process is 0.72V, the platform of the lithium insertion process is 0.28V, the charge and discharge voltage range is 0.01-2.0V, and the specific capacity of the first charge is 215.6mAh / g.

[0034] A preparation method of the lithium-ion battery negative electrode material of the present embodiment, comprising the following steps: taking 5.4823g of tetraethyl titanate and 3.7305g of tetraethyl titanate and dissolving them in 200ml of ethanol, and then adding 1.8851g of oxalic acid Solution A is formed. Weigh 1.6571g of lithium nitrate and dissolve it in a mixed solution of 100ml of ethanol and 5ml of water to form solution B. Slowly add A to the mixed solution of B during the process of constant stirring to obtain a white sol, c...

Embodiment 3

[0037] A kind of negative electrode material of lithium ion battery of the present invention, its chemical formula is Li 2 TiSiO 5 , the reversible capacity of the charge and discharge process is greater than 180mAh / g, the platform of the delithiation process is 0.75V, the platform of the lithium insertion process is 0.32V, the charge and discharge voltage range is 0.01-2.0V, and the specific capacity of the first charge is 207.8mAh / g.

[0038] A preparation method of the lithium-ion battery negative electrode material of the present embodiment, comprising the following steps: dissolving 6.8308g of titanium tetraisopropoxide and 0.3294g of methyltriethoxysilane in 200ml of ethanol, and then adding 2.078g triethanolamine to form solution A. Weigh 4.3451g of lithium oxalate and dissolve it in a mixed solution of 100ml of ethanol and 5ml of water to form solution B. Slowly add A to the mixed solution of B while stirring continuously to obtain a white sol. Continue to stir, (st...

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Abstract

The invention discloses a lithium ion battery cathode material. The cathode material is provided with the chemical formula of Li2TiSiO5, takes the Alpha-VPO5 structure, and adopts the three-dimensional space layered structure. According to the cathode material, under the room temperature condition, the galvanostatic charge-discharge test is carried out in the current density of 10 mA / g within the range of 0.01-2.0 V, so that the reversible capacity obtained during the charge-discharge process is greater than 180 mAh / g, for voltage, the platform of the lithium removing process is 0.68-0.75 V, and the platform of the lithium inserting process is 0.28-0.35 V. When a titanium lithium silicate material is used as the cathode of the lithium ion battery, the problem of cathode lithium precipitation caused by polarization can be effectively avoided, and the safety performance of the lithium ion battery can be greatly improved; compared with the lithium ion battery using lithium titanate as the cathode, the lithium ion battery using titanium lithium silicate is wider in charge-discharge voltage range, high in capacity and excellent in battery cycle performance, and the energy density of the lithium ion battery is greatly improved; the prepared cathode material has a smoother charge-discharge platform.

Description

technical field [0001] The invention relates to the field of lithium-ion battery materials, in particular to a preparation method for using novel lithium titanium silicate as a lithium-ion battery negative electrode material. Background technique [0002] Lithium-ion batteries are secondary batteries. Due to their advantages of high power density, high energy density, excellent cycle performance and wide temperature range, they have been widely used in electronic products, communication equipment, electric vehicles, weapons and aerospace, etc. field. The rapid development of various fields has further put forward higher requirements for the performance of lithium-ion batteries. Existing cathode materials for lithium-ion batteries include layered LiMO 2 , LiM with spinel structure 2 o 4 and LiMPO with olivine structure 4 (M = transition metal ions such as Co, Ni, Mn, and V) and high-capacity materials represented by layered ternary materials and lithium-rich manganese ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485
CPCH01M4/485H01M10/0525Y02E60/10
Inventor 王志兴席昭郭华军李新海彭文杰胡启阳杨勇
Owner CENT SOUTH UNIV
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