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Method for Electromodifying Lithium Titanate in Molten Salt

A technology of lithium titanate and molten salt, applied in the direction of electrolytic components, electrolytic process, etc., to achieve the effect of reducing size, improving electrochemical performance, and improving battery uniformity

Active Publication Date: 2021-02-09
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method can only form Ti on the surface of lithium titanate particles. 3+ Modification to improve its electronic conductivity without changing its microscopic morphology, thereby increasing its ion transport speed

Method used

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  • Method for Electromodifying Lithium Titanate in Molten Salt
  • Method for Electromodifying Lithium Titanate in Molten Salt
  • Method for Electromodifying Lithium Titanate in Molten Salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 2.93g TiO according to the molar ratio Ti:Li=5:4.5 2 as titanium source and 1.22gLi 2 CO 3 As a lithium source, put it into a mortar and grind it for 10 minutes and mix it evenly, then weigh 10g of NaCl-KCl mixed molten salt with a molar ratio of 1:1, and mix it evenly again with a mortar. Put the mixture of molten salt and precursor into a Ф6cm graphite crucible. In order to carry out the subsequent molten salt electric modification step, a graphite rod is placed on the side wall of the graphite crucible as an electrode, and the entire crucible is placed on a Ф10cm. 1:1 NaCl-KCl mixed molten salt corundum crucible, then put the corundum crucible with graphite crucible into a vertical single temperature zone vacuum atmosphere tube furnace, enter Ar gas as a protective atmosphere, heat treatment at 800 °C 6h.

[0032] After the specified reaction time, the temperature of the furnace body remains unchanged. Under high temperature conditions, a graphite rod is ins...

Embodiment 2

[0035] Weigh 2.93g TiO according to the molar ratio Ti:Li=5:4.5 2 as titanium source and 1.22gLi 2 CO 3 As a lithium source, put it into a mortar and grind it for 10 minutes and mix it evenly, then weigh 10g of NaCl-KCl mixed molten salt with a molar ratio of 1:1, and mix it evenly again with a mortar. Put the mixture of molten salt and precursor into a Ф6cm graphite crucible. In order to carry out the subsequent molten salt electric modification step, a graphite rod is placed on the side wall of the graphite crucible as an electrode, and the entire crucible is placed on a Ф10cm. 1:1 NaCl-KCl mixed molten salt in a corundum crucible, then put the corundum crucible with graphite crucible into a vertical single temperature zone vacuum atmosphere tube furnace, pass in Ar gas as a protective atmosphere, heat treatment at 850°C 4h.

[0036] After the specified reaction time, the temperature of the furnace body remains unchanged. Under high temperature conditions, a graphite rod ...

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Abstract

The invention belongs to the field of lithium ion battery negative electrode materials in chemical power sources, and in particular relates to a method for electrically modifying lithium titanate in molten salt. The technical problem to be solved by the present invention is to provide a method for electrically modifying lithium titanate in molten salt, which is characterized in that: it comprises the following steps: a. 2 , Li 2 CO 3 , NaCl and KCl are mixed and added to A crucible; b. Add molten salt to B crucible, put A crucible into B crucible, and then roast at 800-850°C; c. After the roasting is completed, keep the temperature constant, Use a conductive material to connect the A crucible with the molten salt in step b, energize and electrolyze, and obtain self-doped Ti after the electrolysis 3+ of lithium titanate. The method of the invention can change the morphology of the lithium titanate and improve the uniformity of the lithium titanate battery.

Description

technical field [0001] The invention belongs to the field of lithium ion battery negative electrode materials in chemical power sources, and in particular relates to a method for electrically modifying lithium titanate in molten salt. Background technique [0002] The molten salt synthesis method uses alkali metal salts, alkaline earth metal halide salts, nitrates, etc. as the reaction medium. Under high temperature conditions, the temperature reaches the melting point of the molten salt and is in a liquid phase molten state. It has liquid phase ionic liquid reaction characteristics, and the synthesis process is simple. The synthesis method between solid phase and liquid phase has the advantages of both liquid phase and solid phase synthesis methods. After the high-temperature reaction, cool to room temperature, and use distilled water to remove the recyclable molten salt medium to obtain the target synthetic product. The molten salt method is used to synthesize lithium tit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/14
CPCC25B1/14
Inventor 孟伟巍闫蓓蕾
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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