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A lithium titanate negative electrode material, its preparation method and a lithium ion battery using the lithium titanate negative electrode material

A negative electrode material, lithium titanate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as water content increase, achieve the effects of reducing absorption, improving high-temperature storage and high-temperature cycle performance, and less pollution

Active Publication Date: 2016-02-24
SHANGHAI PUTAILAI NEW ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, when the lithium titanate particles from which moisture has been removed are placed in the air, they can easily absorb moisture in the air, which in turn increases the water content.

Method used

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  • A lithium titanate negative electrode material, its preparation method and a lithium ion battery using the lithium titanate negative electrode material
  • A lithium titanate negative electrode material, its preparation method and a lithium ion battery using the lithium titanate negative electrode material
  • A lithium titanate negative electrode material, its preparation method and a lithium ion battery using the lithium titanate negative electrode material

Examples

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Embodiment 1

[0036] This embodiment provides a method for preparing lithium titanate with surface hydrophobization, comprising the following steps:

[0037] 1) Disperse 10g of lithium titanate particles in 50mL of ethanol and stir evenly to obtain a uniformly dispersed mixture;

[0038] 2) Add 5g of dodecanoic acid into 50mL of ethanol, stir until completely dissolved, and obtain dodecanoic acid solution;

[0039] 3) Add the mixed liquid obtained in step 1) and the aqueous solution of dodecanoic acid obtained in step 2) into the same hydrothermal solution;

[0040] 4) Seal the water heater and place it at 100°C for 24 hours before cooling;

[0041] 5) After the hydrothermal solution is naturally cooled to room temperature, filter it with suction, wash the obtained solid particles with ethanol three times, dry them under vacuum, and then heat them at 250°C for 1 hour under nitrogen flow to obtain dodecanoic acid coated on the surface Carboxylated lithium titanate.

Embodiment 2

[0043] This embodiment provides a method for preparing lithium titanate with surface hydrophobization, comprising the following steps:

[0044] 1) Disperse 20g of lithium titanate particles in 100mL of propanol and stir evenly to obtain a uniformly dispersed mixture;

[0045] 2) Add 5g of octanoic acid into 50mL of ethanol, stir until completely dissolved, and obtain octanoic acid solution;

[0046] 3) Add the mixed liquid obtained in step 1) and the octanoic acid aqueous solution obtained in step 2) to the same hydrothermal solution;

[0047] 4) Seal the water heater and place it at 100°C for 12 hours before cooling;

[0048] 5) After the hydrothermal solution is naturally cooled to room temperature, filter it with suction, wash the obtained solid particles with propanol three times, dry them under vacuum, and then heat them at 250°C for 1 hour under nitrogen flow to obtain caprylic acid carboxyl groups coated on the surface. lithium titanate.

Embodiment 3

[0050] This embodiment provides a method for preparing lithium titanate with surface hydrophobization, comprising the following steps:

[0051] 1) Disperse 15g of lithium titanate particles in 50mL of isopropanol and stir evenly to obtain a uniformly dispersed mixture;

[0052] 2) Add 7g of octadecanoic acid into 50mL of isopropanol, stir until completely dissolved, and obtain octadecanoic acid solution;

[0053] 3) Add the mixed solution obtained in step 1) and the octadecanoic acid aqueous solution obtained in step 2) to the same hydrothermal solution;

[0054] 4) Seal the water heater and place it at 100°C for 24 hours before cooling;

[0055] 5) After the hydrothermal solution is naturally cooled to room temperature, filter with suction, wash the obtained solid particles with ethanol three times, dry under vacuum, and then heat under nitrogen flow at 250°C for 1 hour to obtain octadecanoic acid coated on the surface Carboxylated lithium titanate.

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Abstract

The invention discloses a lithium titanate negative electrode material. The lithium titanate negative electrode material comprises lithium titanate particles, wherein the surfaces of the lithium titanate particles are wrapped with hydrophobic radicals; hydrophobic radicals and the lithium titanate particles are in covalent bond connection. According to the lithium titanate with surface hydrophobicity, the catalytic activity of the lithium titanate is reduced, thus the swelling problem of a lithium titanate battery is obviously improved, and the high temperature performance of the lithium titanate battery is improved. Moreover, the invention further discloses a method for hydrophobically treating the surfaces of the lithium titanate particles, wherein the surface hydrophobization of lithium titanate is effectively realized. In addition, the invention further discloses the lithium ion battery using the lithium titanate negative electrode material.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a lithium titanate negative electrode material and a preparation method thereof, and a lithium ion battery using the lithium titanate negative electrode material. Background technique [0002] With the expansion of the application range of lithium-ion batteries, higher requirements are put forward for the safety, service life and rate performance of battery materials. [0003] Negative electrode active materials have an important impact on the safety performance and rate performance of lithium-ion batteries. Common negative electrode active materials include graphite, tin-silicon alloy, and lithium titanate. Lithium titanate (Li 4 Ti 5 o 12 ) is considered to be one of the most promising anode materials, which has the following advantages: [0004] First, due to the fact that Li 4 Ti 5 o 12 The skeleton structure hardly changes. Lithium titanate is called a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/485H01M10/0525
CPCH01M4/366H01M4/485H01M4/62H01M10/0525Y02E60/10
Inventor 方祺陈卫
Owner SHANGHAI PUTAILAI NEW ENERGY TECH CO LTD
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