Lithium-metasilicate-modified lithium titanate cathode material and preparing method and application thereof

A negative electrode material, lithium titanate technology, applied in the direction of negative electrode, active material electrode, battery electrode, etc., can solve the problem of low ion conductivity, achieve high reversible capacity, excellent cycle stability, excellent ion conductivity Effect

Active Publication Date: 2016-04-20
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is aimed at the problem that the ionic conductivity of lithium titanate negative electrode material is low, in view of solid electrolyte lithium silicate (Li 2 SiO 3 , abbreviated as LSO) high ionic conductivity, through many experiments we found that coating a small amount of lithium silicate on the surface of lithium titanate not only effectively improved the ionic conductivity of lithium titanate, but also improved the Electronic conductivity, thereby improving the rapid charge and discharge performance and cycle stability of lithium titanate at high current density

Method used

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  • Lithium-metasilicate-modified lithium titanate cathode material and preparing method and application thereof
  • Lithium-metasilicate-modified lithium titanate cathode material and preparing method and application thereof
  • Lithium-metasilicate-modified lithium titanate cathode material and preparing method and application thereof

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Effect test

Embodiment 1

[0039] Lithium titanate is prepared by lithium hydroxide and nano titanium oxide, and then the prepared lithium titanate is mixed with lithium silicate emulsion to prepare lithium silicate modified lithium titanate negative electrode material. Weigh 1.17g of lithium hydroxide and 2.78g of nano-titanium oxide with a balance, mix them uniformly, heat them to about 600°C in the air, and keep them warm for 5 hours. The heating furnace was turned off, and it was naturally cooled to room temperature to obtain 3.0 g of white powder. Weigh 1.5g of white powder and an emulsion containing 0.0075g of lithium silicate, stir them evenly in 20mL of deionized water, dry at 120°C, and then heat to 700°C for 3 hours. After cooling to room temperature, 1.5 g of white powder was obtained.

Embodiment 2

[0041]Lithium titanate is prepared by lithium hydroxide and nano titanium oxide, and then the prepared lithium titanate is mixed with lithium silicate emulsion to prepare lithium silicate modified lithium titanate negative electrode material. Weigh 1.17g of lithium hydroxide and 2.78g of nano-titanium oxide with a balance, mix them uniformly, heat them to about 600°C in the air, and keep them warm for 5 hours. The heating furnace was turned off, and it was naturally cooled to room temperature to obtain 3.0 g of white powder. Weigh 1.5g of white powder and an emulsion containing 0.0165g of lithium silicate, stir in 20mL of deionized water, dry at 120°C, and then heat to 750°C for 5 hours. After cooling to room temperature, 1.5 g of white powder was obtained.

Embodiment 3

[0043] Lithium titanate is prepared by lithium hydroxide and nano titanium oxide, and then the prepared lithium titanate is mixed with lithium silicate emulsion to prepare lithium silicate modified lithium titanate negative electrode material. Weigh 1.17g of lithium hydroxide and 2.78g of nano-titanium oxide with a balance, mix them uniformly, heat them to about 600°C in the air, and keep them warm for 5 hours. The heating furnace was turned off, and it was naturally cooled to room temperature to obtain 3.0 g of white powder. Weigh 1.5g of white powder and an emulsion containing 0.027g of lithium silicate, stir them evenly in 20mL of deionized water, dry them at 120°C, and then keep them at 750°C for 5 hours. After cooling to room temperature, 1.5 g of white powder was obtained.

[0044] The battery assembled by the lithium silicate modified lithium titanate negative electrode material obtained in this embodiment has been tested for 100 cycles at a current density of 100mA / g,...

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Abstract

The invention discloses a lithium-metasilicate-modified lithium titanate cathode material and a preparing method and application thereof. The expression of the lithium titanate cathode material is LTO / LSO. The preparing method comprises the steps of weighing lithium titanate emulsion and lithium metasilicate emulsion in proportion, conducting even mixing, conducting drying at 100-200 DEG C, conducting sintering for 3-10 h at 650-900 DEG C, then naturally decreasing temperature to room temperature, and conducting grinding. The prepared lithium-metasilicate-modified lithium titanate cathode material has excellent ion and electron conduction performance, has high coulombic efficiency and excellent electrochemical performance without surface carbon covering as a lithium ion battery cathode material, and has high coulombic efficiency, high reversible capacity and excellent cycling stability even during rapid charging / discharging under the current density of 500 mA / g. The preparing method is simple, operation is convenient, and practicality is high.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery negative electrode materials, and relates to a lithium silicate modified lithium titanate negative electrode material, a preparation method and an application thereof. Background technique [0002] In recent years, the wide application of lithium-ion batteries has put forward higher and higher requirements on the safety performance, rate performance and service life of electrode materials. At present, graphite is the most commonly used anode material for lithium-ion batteries. However, due to its potential safety hazards, voltage hysteresis, and poor cycle performance, it cannot meet the needs of portable electronic products and electric vehicles for high energy density and high power density. Therefore, designing new anode materials that can replace graphite anode materials is one of the main tasks facing the current lithium-ion battery industry. [0003] Lithium titanate (Li 4 Ti ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/362H01M4/485H01M4/62H01M10/0525H01M2004/027H01M2220/20H01M2220/30Y02E60/10
Inventor 白玉俊白雪白瑞临伦宁亓永新
Owner SHANDONG UNIV
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