Li1+xAlxTi2-x (PO3)4-coated lithium cobalt oxide material and preparation method and application thereof

A lithium cobalt oxide and coating technology, which is applied in the field of lithium cobalt oxide materials and its preparation, can solve problems such as increased impedance, increased problems, and decreased cycle stability, and achieves reduced polarization, less impact, and reduced interface impedance. Effect

Inactive Publication Date: 2019-07-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently LiCoO 2 It has been commercialized as a cathode material, but with the increase in use, the problems exposed have also increased
Lithium cobaltate positive electrode has a theoretical capacity of 274mAh / g. During the charging and discharging process, the lithium cobaltate structure changes in volume as lithium ions are repeatedly intercalated and extracted, resulting in an increase in impedance.
However, due to irreversible structural changes, its actual reversible capacity is only 145mAh / g, and a larger specific capacity can be obtained when the cut-off voltage is increased, but the cycle stability is also severely reduced.

Method used

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  • Li1+xAlxTi2-x (PO3)4-coated lithium cobalt oxide material and preparation method and application thereof
  • Li1+xAlxTi2-x (PO3)4-coated lithium cobalt oxide material and preparation method and application thereof
  • Li1+xAlxTi2-x (PO3)4-coated lithium cobalt oxide material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Li 1+x al x Ti 2-x (PO 4 ) 3 The preparation of coated lithium cobalt oxide material, take Li 1+x al x Ti 2-x (PO 4 ) 3 In x=0.3, first press Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 Stoichiometric ratio, weighed 181.08mg C 16 h 36 o 4 Ti, 170.9mg C 6 h 15 o 4 P, 28.56 mg LiNO 3 and 35.22mg Al(NO 3 ) 3 Dissolve in 15ml of ethanol to obtain a precursor solution. The mass ratio of lithium titanium aluminum phosphate to lithium cobaltate is 0.5%:1, weigh lithium cobaltate, disperse lithium cobaltate in it, stir ultrasonically for 1h, and then dry at 80°C for 1h , and then sintered. During the sintering process, the temperature was raised to 650° C. at a rate of 2° C. / min and kept for 6 hours, and finally cooled to room temperature to obtain the coated lithium cobaltate material. The coated lithium cobaltate material is used as the active material, and it is ground with PVDF and super-P at a mass ratio of 8:1:1 for 30 minutes, then dissolved in N-methylpyrrolido...

Embodiment 2

[0028] Li 1+x al x Ti 2-x (PO 4 ) 3 The preparation of coated lithium cobalt oxide material, take Li 1+x al x Ti 2-x (PO 4 ) 3 In x=0.4, first press Li 1.4 al 0.4 Ti 1.6 (PO 4 ) 3 Stoichiometric ratio, weighed 181.08mg C 16 h 36 o 4Ti , 170.9mg C 6 h 15 o 4 P, 28.56mgLiNO 3 and 35.22mg Al(NO 3 ) 3 Dissolve in 15ml of ethanol to obtain a precursor solution. The mass ratio of lithium titanium aluminum phosphate to lithium cobalt oxide is 1%: 1. Weigh the lithium cobalt oxide, disperse the lithium cobalt oxide in it, stir it ultrasonically for 1 hour, and then dry it at 75°C 2h, and then sintering. During the sintering process, the temperature was raised to 550°C at a heating rate of 1°C / min and kept for 6h, and finally cooled to room temperature to obtain the coated lithium cobalt oxide material. The coated lithium cobalt oxide material is used as the active material, and it is ground with PVDF and super-P at a mass ratio of 8:1:1 for 30 minutes, then disso...

Embodiment 3

[0031] Li 1+x Al x Ti 2-x (PO 4 ) 3 The preparation of coated lithium cobalt oxide material, take Li 1+x Al x Ti 2-x (PO 4 ) 3 In x=0.5, first press Li 1.5 Al 0.5 Ti 1.5 (PO 4 ) 3 Stoichiometric ratio, weighed 181.08mg C 16 h 36 o 4 Ti , 170.9mg C 6 h 15 o 4 P, 28.56mgLiNO 3 and 35.22mg Al(NO 3 ) 3 Dissolve in 15ml of ethanol to obtain a precursor solution. The mass ratio of lithium titanium aluminum phosphate to lithium cobaltate is 2%:1, weigh lithium cobaltate, disperse lithium cobaltate in it, stir ultrasonically for 1h, then dry at 85°C for 1h , and then sintered. During the sintering process, the temperature was raised to 750° C. at a rate of 3° C. / min and kept for 6 hours, and finally cooled to room temperature to obtain the coated lithium cobaltate material. The coated lithium cobaltate material is used as the active material, and the coated positive electrode, PVDF and super-P are ground in a mass ratio of 8:1:1 for 30 minutes, then dissolved in ...

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Abstract

The invention discloses a Li1+xAlxTi2-x(PO4)3-coated lithium cobalt oxide material and a preparation method and application thereof. According to the preparation method, tetrabutyl titanate, triethylphosphate, lithium nitrate and aluminum nitrate are taken as raw materials to prepare a precursor solution, then the lithium cobalt oxide is dispersed in the precursor solution and the coating amountis controlled to be 0.5wt%-2wt% at high temperature of 550-750 DEG C so as to obtain the Li1+xAlxTi2-x(PO3)4-coated cobalt acid material. The lithium titanium aluminum phosphate acts as a fast ionic conductor to significantly improve the ion conduction at the positive electrode, and the performance of the battery is also good even in the 4.3-4.5V high voltage electrochemical test. Compared with the conventional positive electrode materials, the cycle stability and the rate performance are significantly improved. After 40 cycles of 0.2 C, the capacity retention of the coated positive electrodeis increased by 10% and the capacity is increased by 63 mAh / g at 2C current density.

Description

technical field [0001] The invention belongs to the field of positive electrode modification of lithium ion batteries, in particular to a Li 1+x al x Ti 2-x (PO 3 ) 4 Coated lithium cobalt oxide material and its preparation method and application. Background technique [0002] Lithium-ion batteries are widely used in many electronic devices due to their advantages of high energy density and long cycle life, and have broad prospects in energy storage. As market demand changes, higher requirements are placed on energy storage devices, and lithium-ion batteries are developing toward higher energy density and higher safety. Lithium cobalt oxide has the advantages of long cycle life, high conductivity, and large rate, and is widely used. Lithium cobalt oxide has a CoO 6 and LiO 6 The layered structure composed of regular octahedra has now developed many transition metal ion cathode materials with similar structures, such as LiNi 0.33 mn 0.33 co 0.33 o 2 and LiNi 0.6 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/525H01M10/0525
CPCH01M4/366H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 王素清胡欣超王海辉
Owner SOUTH CHINA UNIV OF TECH
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