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A kind of modified lithium titanate electrode material and preparation method thereof

An electrode material, lithium titanate technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of limited performance improvement of LTO, and achieve the effects of low cost, improved electronic conductivity, and simple process

Active Publication Date: 2021-10-08
中博龙辉装备集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the prior art, the surface modification of LTO is mostly limited to the use of a single material, such as carbon film surface coating or coating other inert materials, so the improvement of LTO performance is limited

Method used

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  • A kind of modified lithium titanate electrode material and preparation method thereof
  • A kind of modified lithium titanate electrode material and preparation method thereof
  • A kind of modified lithium titanate electrode material and preparation method thereof

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preparation example Construction

[0028] The invention provides a preparation method of a modified lithium titanate electrode material, comprising the following steps:

[0029] (1) Lithium dihydrogen phosphate, phenolic resin and solvent are mixed to obtain a suspension;

[0030] (2) Evaporate to dryness and grind after mixing the suspension and lithium titanate to obtain powder;

[0031] (3) In an inert atmosphere, heat-treat the powder to obtain the modified lithium titanate electrode material.

[0032] In the present invention, the mass ratio of lithium dihydrogen phosphate and phenolic resin in the step (1) is preferably 1-10: 1-10, more preferably 2-8: 2-8, more preferably 4-6: 4~6.

[0033] In the present invention, the solid content of the suspension in the step (1) is preferably 0.1-1 g / L, more preferably 0.2-0.8 g / L, more preferably 0.4-0.6 g / L.

[0034] In the present invention, two materials are used for simultaneous coating, and the two coating materials can exert synergistic benefits, that is, ...

Embodiment 1

[0049]Mix phenolic resin, lithium dihydrogen phosphate and ethanol to obtain 0.5L of a suspension with a solid content of 0.5g / L. The mass ratio of phenolic resin to lithium dihydrogen phosphate is 1:1; then add 5g of Lithium titanate, the particle size of lithium titanate is 500nm, stirred at 450rpm for 4 hours; then evaporated to dryness at 60°C, all the ethanol was evaporated, and ground at 60rpm for 3h after evaporation to obtain powder;

[0050] The powder was placed in a nitrogen atmosphere and heat-treated at 750° C. for 2 hours to obtain a modified lithium titanate electrode material.

[0051] The modified lithium titanate electrode material prepared in this example was observed, figure 1 It is the SEM picture of the modified lithium titanate electrode material, figure 2 is the TEM image of the modified lithium titanate electrode material, from figure 1 with figure 2 It can be clearly seen that there are obvious coatings on the surface of the modified lithium tita...

Embodiment 2

[0062] Mix phenolic resin, lithium dihydrogen phosphate and ethanol to obtain 1L of a suspension with a solid content of 0.8g / L, and the mass ratio of phenolic resin to lithium dihydrogen phosphate is 2:1; then add 20g of Lithium titanate, the particle size of lithium titanate is 400nm, stirred at 500rpm for 5 hours; then evaporated to dryness at 70°C, all the ethanol was evaporated, and ground at 50rpm for 3h after evaporation to obtain powder;

[0063] The powder was placed in a nitrogen atmosphere and heat-treated at 700° C. for 2.5 hours to obtain a modified lithium titanate electrode material.

[0064] Assemble the button battery: Weigh 0.425g of the obtained modified lithium titanate composite negative electrode material, add 0.05g of acetylene black as a conductive agent and 0.025g of LA-132 as a binder, and grind and mix them evenly in an agate mortar to make an electrode The slurry was uniformly coated on the aluminum foil, and dried in a vacuum oven at a temperature ...

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Abstract

The invention belongs to the technical field of energy and new materials. The invention provides a method for preparing a modified lithium titanate electrode material, using phenolic resin and lithium dihydrogen phosphate as raw materials, and adopting a wet chemical method to coat the surface of submicron-sized lithium titanate with phenolic resin and dihydrogen phosphate The mixture of hydrogen and lithium is then calcined in an inert atmosphere to achieve a mixture of graphitized carbon layer and lithium phosphate coated on the surface of lithium titanate. The preparation method provided by the invention has cheap and easy-to-obtain raw materials, and adopts a wet chemical method and heat treatment means with simple process and low cost, and is suitable for large-scale production. The present invention also provides the modified lithium titanate electrode material. Both the graphitized carbon layer and lithium phosphate can play the role of shielding the catalytic active points on the surface of lithium titanate, and can exert synergistic benefits, that is, to improve the rapid Charge and discharge performance, and inhibit its gas production behavior.

Description

technical field [0001] The invention relates to the technical field of energy and new materials, in particular to a modified lithium titanate electrode material and a preparation method thereof. Background technique [0002] Spinel lithium titanate (Li 4 Ti 5 o 12 , LTO) as a lithium-ion battery anode material has the characteristics of long cycle life, high safety performance, and environmental friendliness. Compared with other anode materials, LTO has two outstanding advantages: (1) The charging and discharging voltage platform is 1.55V (vs. Li+ / Li), which can avoid the reduction and decomposition of commonly used electrolytes on its surface, and has high safety; ( 2) It is a "zero strain" electrode material, and the unit cell has almost no volume change during the lithium ion deintercalation process, and has excellent cycle performance. However, the electronic conductivity of LTO is low, the lithium ion migration rate is not high, and the electrode polarization is sev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/58H01M4/583H01M10/0525
CPCY02E60/10
Inventor 李哲东李星王明珊陈俊臣
Owner 中博龙辉装备集团股份有限公司
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