Titanium lithium silicate anode material for lithium-ion battery and preparation method and application

A lithium-ion battery, lithium titanium silicate technology, applied in battery electrodes, secondary batteries, circuits, etc., to achieve good application prospects, avoid poor cycle performance, and excellent cycle performance

Inactive Publication Date: 2016-01-06
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after being effectively coated with conductive substances, especially carbon-based materials, Li 2 TiSiO 5 This electrode material has a considerable capacity between 0-3V, and the cycle performance is stable, and no obvious capacity fading or capacity fluctuation was found during the cycle

Method used

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  • Titanium lithium silicate anode material for lithium-ion battery and preparation method and application
  • Titanium lithium silicate anode material for lithium-ion battery and preparation method and application
  • Titanium lithium silicate anode material for lithium-ion battery and preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Add 3.4g tetra-n-butyl titanate (TBOT) and 2.1g tetraethyl orthosilicate to 200mL ethanol solution, stir well and add 10mL of aqueous solution containing 0.84g lithium hydroxide monohydrate and 0.35g sucrose , stirred vigorously to volatilize the obtained solution to dryness, the obtained white solid precursor was placed in a muffle furnace, calcined at 300 ° C for 4 hours, and then placed in a tube furnace, calcined at 900 ° C for 24 hours under the protection of argon, that is, Carbon coated lithium titanium silicate.

[0033] The above prepared negative electrode material powder and carbon black and a concentration of 9% polyvinylidene fluoride N-methyl-2-pyrrolidone solution are fully ground into a uniform slurry viscous liquid, wherein carbon black accounts for 10% of the weight of the negative electrode material powder, Polyvinylidene fluoride accounts for 10% of the weight of the negative electrode material powder. Then it is coated on the copper foil...

Embodiment 2

[0034] Example 2: Put 6g of nano-silica (about 10nm), 8g of nano-titanium dioxide (about 8nm), 14g of lithium nitrate and 1.74g of expanded graphite, put them in a ball mill jar after simple mixing, and ball mill for 8 hours. In a tube furnace, calcined at 900° C. for 24 hours under the protection of argon to obtain nanoscale lithium titanium silicate coated with expanded graphite carbon.

[0035] The negative electrode material prepared above was processed and tested according to the method in Example 1. Compared with the battery in Example 1, the battery performance was slightly lowered in the capacity of high-current charging / discharging, but the long-term cycle performance was slightly improved. .

Embodiment 3

[0036] Example 3: 3.4 g of tetra-n-butyl titanate (TBOT) and 2.1 g of tetraethyl orthosilicate (TEOS) were added to 200 mL of ethanol solution, and evaporated to dryness. The obtained white solid precursor was placed in a muffle furnace, calcined at 300°C for 4 hours, and then calcined at 800°C for 4 hours under an argon / toluene atmosphere. The obtained black solid powder was mixed with 0.84g of lithium salt, and calcined at 900°C for 24 hours to obtain Nano-lithium titanium silicate coated by chemical vapor deposition.

[0037] The negative electrode material obtained above was processed and tested according to the method in Example 1, and the first-cycle capacity of the obtained battery was 290mAh / g at a current of 30mA / g, and the capacity was greater than that of uncoated titanium silicate at a relatively high current. The capacity of lithium is slightly higher than the result obtained in Example 2.

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Abstract

The invention belongs to the technical field of lithium-ion batteries, and particularly discloses a titanium lithium silicate anode material for a lithium-ion battery and a preparation method and an application of the titanium lithium silicate anode material. The lithium-ion battery anode material disclosed by the invention comprises a titanium lithium silicate material, a titanium lithium silicate-based ion-doped compound and an ion-doped titanium lithium silicate material, wherein the titanium lithium silicate material is subjected to coating treatment; the ion-doped titanium lithium silicate material is also subjected to coating treatment; a main body of the anode material is an inorganic salt of titanium lithium silicate; and the chemical formula is Li2TiSiO5. According to the titanium lithium silicate material prepared by the method, the energy density is higher than that of the traditional titanium lithium silicate material; the working voltage is lower than that of lithium titanate; the titanium lithium silicate material has the characteristics of high capacity density and high power density; and the material has a stable structure and good cycle performance, and is a novel anode material for the lithium-ion battery with a good application prospect after inheriting existing anode materials such as lithium titanate and graphite.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium titanium silicate negative electrode material for lithium ion batteries and a preparation method and application thereof. Background technique [0002] In recent years, with the increasing depletion of fossil energy and the increasing severity of environmental problems such as global warming, research on new energy has received widespread attention in society. As an important link in the application of new energy to production and life, lithium-ion batteries have developed by leaps and bounds in recent decades. The performance of lithium-ion batteries mainly depends on the electrochemical properties of their positive / negative electrode materials. With the increasing application range of lithium-ion batteries, the requirements for battery performance are also increasing. Traditional electrode materials have gradually been unable to meet people's...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M4/1397H01M10/0525
CPCH01M4/1397H01M4/5825H01M4/62H01M10/0525Y02E60/10
Inventor 夏永姚刘敬源
Owner FUDAN UNIV
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