Preparation method of lithium titanate negative electrode material of lithium ion battery

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, and secondary battery repair/maintenance, etc., can solve the problems of carbon material structure damage, capacity decay, thermal runaway, etc. Stable and highly conductive, structurally stable effect

Active Publication Date: 2020-07-10
JIANGSU AOXIN TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most lithium-ion battery negative electrode materials use various lithium-intercalated carbon materials, but the potential of the carbon electrode is very close to that of metal lithium. When the battery is overcharged, metal lithium is easily precipitated on the surface of the carbon electrode, which will form dendrites and cause a short circuit. When the temperature is too high, it is easy to cause problems such as thermal runaway
At the same time, the structure of carbon materials will be damaged during repeated insertion and deintercalation of lithium ions; in addition, there are also major problems in the compatibility of carbon materials and electrolytes (such as propylene carbonate-based materials), resulting in capacity fading

Method used

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  • Preparation method of lithium titanate negative electrode material of lithium ion battery
  • Preparation method of lithium titanate negative electrode material of lithium ion battery
  • Preparation method of lithium titanate negative electrode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] S1. Add 0.0045mol LiOH·H 2 O and 0.005mol Ti(OC 4 h 9 ) 4 respectively dissolved in 50mL of the first solvent, and then mixed uniformly under stirring conditions to obtain the first mixed solution, wherein the first solvent is a mixture of ethanol, ethylene glycol and glycerin, and the volume ratio of the three is 3:2 :1;

[0030] S2. Add 5mL of 20% hydrogen peroxide solution to the first mixed solution obtained in step S1, and stir vigorously for 30s, then transfer it to a 200mL reactor, then react at 180°C for 11h, collect the solid obtained in the reaction, and use After washing with anhydrous ethanol for 3 times, and calcining for 5 h under air atmosphere, the porous Li 4 Ti 5 o 12 Nanosheets;

[0031] S3. Dissolve 1g of medium-temperature coal tar pitch in 75mL of the second solvent, mix 2g of KOH and K 2 FeO 4 The mixture is dissolved in 75mL of the third solvent, and then the two are mixed to obtain the second mixed solution, wherein the second solvent i...

Embodiment 2

[0035] S1. Add 0.0045mol LiOH·H 2 O and 0.005mol Ti(OC 4 h 9 ) 4 respectively dissolved in 50mL of the first solvent, and then mixed uniformly under stirring conditions to obtain the first mixed solution, wherein the first solvent is a mixture of ethanol, ethylene glycol and glycerin, and the volume ratio of the three is 3:2 :1;

[0036] S2. Add 5mL of 20% hydrogen peroxide solution to the first mixed solution obtained in step S1, and stir vigorously for 30s, then transfer it to a 200mL reactor, then react at 160°C for 11h, collect the solid obtained in the reaction, and use After washing twice with absolute ethanol, calcined for 5 h under air atmosphere, the porous Li 4 Ti 5 o 12 Nanosheets;

[0037] S3. Dissolve 1g of medium-temperature coal tar pitch in 75mL of the second solvent, mix 2g of KOH and K 2 FeO 4 The mixture is dissolved in 75mL of the third solvent, and then the two are mixed to obtain the second mixed solution, wherein the second solvent is a mixture ...

Embodiment 3

[0041] S1. Add 0.0045mol LiOH·H 2 O and 0.005mol Ti(OC 4 h 9 ) 4 respectively dissolved in 50mL of the first solvent, and then mixed uniformly under stirring conditions to obtain the first mixed solution, wherein the first solvent is a mixture of ethanol, ethylene glycol and glycerin, and the volume ratio of the three is 3:2 :1;

[0042] S2. Add 5mL of 20% hydrogen peroxide solution to the first mixed solution obtained in step S1, stir vigorously for 30s, then transfer to a 200mL reaction kettle, then react at 200°C for 11h, collect the solid obtained from the reaction, and use After washing with anhydrous ethanol for 3 times, and calcining for 5 h under air atmosphere, the porous Li 4 Ti 5 o 12 Nanosheets;

[0043] S3. Dissolve 1g of medium-temperature coal tar pitch in 75mL of the second solvent, mix 2g of KOH and K 2 FeO 4 The mixture is dissolved in 75mL of the third solvent, and then the two are mixed to obtain the second mixed solution, wherein the second solven...

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Abstract

The invention provides a preparation method of a lithium titanate negative electrode material of a lithium ion battery. The invention belongs to the technical field of lithium-ion batteries. The method comprises the following steps: preparing porous Li4Ti5O12 nanosheets by utilizing LiOH.H2O, Ti (OC4H9) 4 and the like; then preparing nitrogen-doped carbon nanosheets by utilizing medium-temperaturecoal pitch and the like; then, grinding and transferring the porous Li4Ti5O12 nanosheets, the nitrogen-doped carbon nanosheets and a sulfur-containing substance into a tubular furnace; and carrying out continuous heat treatment in a mixed gas at 500-600 DEG C for 3 hours, and naturally cooling to room temperature to obtain a coal pitch-based sulfur and nitrogen-doped carbon nanosheet modified sulfur-doped lithium titanate negative electrode material with a hierarchical structure. The negative electrode material prepared by the invention is in a nanosheet shape, is stable and compact in structure, maintains the stability and high conductivity of an electrode structure, and has excellent high-rate performance and cycling stability.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a lithium titanate negative electrode material for a lithium ion battery. Background technique [0002] On the one hand, traffic vehicle pollution has become an important source of global air pollution. On the other hand, the oil crisis has become increasingly severe. Therefore, countries all over the world attach great importance to the development of electric vehicles and hybrid electric vehicles. Lithium-ion battery has become a research and development hotspot of power battery because of its high working voltage, high specific energy and specific power, long cycle life and low environmental pollution. It is considered to be the most reliable energy storage and conversion device at present. The performance and preparation process of lithium-ion battery anode materials largely determine the performance of lithium-ion batteries. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/583H01M4/62H01M10/0525H01M10/42
CPCH01M4/362H01M4/38H01M4/485H01M4/583H01M4/625H01M10/0525H01M10/4235Y02E60/10
Inventor 伊廷锋戴德兵张文泉李忠明戴长松
Owner JIANGSU AOXIN TECH DEV
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