Lithium titanate composite material and preparing method thereof, and lithium ion battery

A technology for lithium ion batteries and composite materials, which is applied in the field of lithium titanate composite materials and their preparation, can solve problems such as battery capacity decline, poor electronic conductivity, and lithium ion battery gassing, and achieves good cycle stability and improves cycle stability. The effect of sex and longevity, the production method is simple

Active Publication Date: 2014-01-01
微宏先进材料公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Li 4 Ti 5 o 12 It also has its own disadvantages. It is an insulator material with poor electronic conductivity. When charging and discharging at a high rate, the capacity of lithium-ion batteries will also decay. Under certain conditions, with the increase of charge and discharge times, the lithium-ion battery gasses faster and the battery capacity decreases.

Method used

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  • Lithium titanate composite material and preparing method thereof, and lithium ion battery
  • Lithium titanate composite material and preparing method thereof, and lithium ion battery
  • Lithium titanate composite material and preparing method thereof, and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 1280.4g of LiOH·H with a purity of 98% 2 O and 3000g of TiO with a purity of 99.5% 2 Mix, and add 3.0L deionized water and stir evenly, then add 214.8g of Ba(OH) with a purity of 98% 2 ·8H 2 O, after continuing to stir for 5h, a mixed slurry was obtained. Then the prepared mixed slurry was spray-dried and sintered at 750° C. for 5 hours to obtain a lithium titanate composite material, which can be directly used as a negative electrode material of a lithium-ion battery. In this example, the lithium titanate composite material Ba x Li 4 Ti 5 o 12+x x=0.09. If Ba is calculated as BaO, the content of BaO is 3.0% based on the mass percentage of BaO in LTO.

[0033] Weigh 1.200g of the above-mentioned lithium titanate composite material, add a certain proportion of conductive agent, binder and N-methyl-2-pyrrolidone (N-methyl-2-pyrrolidone, NMP), use a planetary ball mill for 4 hours, and obtain the result after ball milling The lithium titanate composite mater...

Embodiment 2

[0035] Weigh 1280.4g of LiOH·H with a purity of 98% 2 O and 3000g of TiO with a purity of 99.5% 2 Mix, and add 3.0L deionized water and stir evenly, then add 143.2g of Ba(OH) with a purity of 98% 2 ·8H 2 O, after continuing to stir for 5h, a mixed slurry was obtained. Then the prepared mixed slurry was spray-dried and sintered at 750° C. for 5 hours to obtain a lithium titanate composite material, which can be directly used as a negative electrode material of a lithium-ion battery. In this embodiment, the lithium titanate composite material Ba x Li 4 Ti 5 o 12+x x=0.06 in . If Ba is calculated as BaO, the mass percentage of BaO is 2.0%.

[0036] Weigh 1.200g of the above-mentioned lithium titanate composite material, add a certain proportion of conductive agent, binder and N-methyl-2-pyrrolidone (N-methyl-2-pyrrolidone, NMP), use a planetary ball mill to perform ball milling for 4 hours, after ball milling The obtained lithium titanate composite material powder is coa...

Embodiment 3

[0038] Weigh 1280.4g of LiOH·H with a purity of 98% 2 O and 3000g of TiO with a purity of 99.5% 2 Mix, and add 3.0L deionized water and stir evenly, then add 71.6g of Ba(OH) with a purity of 98% 2 ·8H 2 O, after continuing to stir for 5h, a mixed slurry was obtained. Then the prepared mixed slurry was spray-dried and sintered at 750° C. for 5 hours to obtain a lithium titanate composite material, which can be directly used as a negative electrode material of a lithium-ion battery. In this embodiment, the lithium titanate composite material Ba x Li 4 Ti 5 o 12+x x=0.03. If Ba is calculated as BaO, the mass percentage of BaO is 1.0%.

[0039] Weigh 1.200g of the above-mentioned lithium titanate composite material, add a certain proportion of conductive agent, binder and N-methylpyrrolidone, use a planetary ball mill to perform ball milling for 4 hours, and coat the lithium titanate composite material powder obtained after ball milling on aluminum A film with a thickness...

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Abstract

A lithium titanate doped with a barium oxide and a manufacturing method thereof are provided. At first, a barium source material, a lithium source material and a titanium source material are mixed together to prepare a mixture. Then, a drying process is applied to the mixture. Thereafter, a sintering process is applied to the mixture after the drying process, thereby obtaining the lithium titanate doped with the barium oxide. The lithium titanate doped with the barium oxide has the following chemical formula: BaxLi4Ti5O12+x, wherein 0.006@x@0.12. A lithium ion battery is also provided, which has an excellent cycling stability, a fast charge-discharge capability and a high safety performance.

Description

Technical field [0001] The invention relates to a lithium ion battery, and in particular to a lithium titanate composite material and a preparation method thereof, and a lithium ion battery using the lithium titanate composite material as a negative electrode. Background technique [0002] With the development of batteries, lithium-ion batteries have gradually become mainstream products due to their high specific energy, high voltage and low pollution characteristics. The negative electrode materials of lithium-ion batteries mainly include carbon-based materials, nitrides, silicon-based materials, tin-based materials, and various new alloys, among which carbon-based materials have been practically used, and other materials are mostly in the laboratory research stage. [0003] In the late 1980s, lithium titanate (Li 4 Ti 5 o 12 , LTO) has been studied as a cathode material for lithium-ion batteries, but because Li 4 Ti 5 o 12 Compared with lithium metal, the potential i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M10/0525
CPCH01M10/0525H01M4/485C01G23/005C01P2002/50H01M4/5825Y02E60/10
Inventor 周小平付凌雁
Owner 微宏先进材料公司
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