Lithium molybdate surface modified lithium ion battery nickel-rich positive pole material and preparation method thereof

A lithium-ion battery and surface modification technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as charge and discharge and stability research, and achieve improved cycle stability and safety performance with high reproducibility , control the effect of convenience

Inactive Publication Date: 2016-05-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, although many patents have disclosed oxide surface modification to modify nickel-rich cathode materials (CN201210374529.0 and CN201310699738.7), but for the removal of lithium residues on the surface of nickel-rich materials and nickel-rich cathode materials under high pressure There are few studies on charging and discharging and stability under
Lithium molybdate, as a new type of negative electrode material for lithium-ion batteries, is a good lithium-ion conductor material, which is conducive to the deintercalation of lithium ions. However, the use of lithium molybdate to modify the surface of ternary nickel-rich positive electrode materials has not been studied. See the report

Method used

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  • Lithium molybdate surface modified lithium ion battery nickel-rich positive pole material and preparation method thereof
  • Lithium molybdate surface modified lithium ion battery nickel-rich positive pole material and preparation method thereof
  • Lithium molybdate surface modified lithium ion battery nickel-rich positive pole material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Weigh 0.1mol of (Ni 0.8 co 0.15 Al 0.05 )(OH) 2 For the precursor material, disperse it in 200ml deionized water, and sonicate it for 1 hour. Then, take 0.1g of ammonium molybdate and add it into deionized water to form a molybdenum source solution of 0.01mol / L, and add the configured molybdenum source solution dropwise to the solution containing the precursor material under stirring conditions simultaneously. Stir evenly at 80°C and evaporate to dryness, then dry at 120°C for 12 hours.

[0029] (2) Weigh 0.105 mol of lithium hydroxide and mix it with the materials prepared in the above step (1), add 50 mL of absolute ethanol as a dispersant, and after ball milling for 8 hours, dry and press into tablets to obtain precursor tablets. First put the precursor sheet into a tube furnace, heat treatment at 500°C for 4 hours in an oxygen atmosphere, then continue to heat up to 750°C for sintering for 12 hours, and naturally cool to room temperature to obtain Li 2 MoO ...

Embodiment 2

[0032] (1) Weigh 0.2mol of (Ni 0.8 co 0.15 mn 0.05 )(OH) 2 Precursor materials were dispersed in 800ml deionized water and ultrasonicated for 0.5 hours. Then, the molybdenum acid that takes 0.2g is added into the deionized water and is made into the molybdenum source solution of 0.02mol / L, and the molybdenum source solution that will configure is added dropwise to (Ni 0.8 co 0.15 mn 0.05 )(OH) 2 The solution of the precursor material was uniformly stirred at 100°C and evaporated to dryness, and then dried at 110°C for 20 hours.

[0033] (2) Weigh 0.105 mol of lithium carbonate and mix it with the materials prepared in the above step (1), add 100 mL of absolute ethanol as a dispersant, ball mill for 8 hours, dry and press into tablets to obtain precursor tablets. First put the precursor sheet into a tube furnace, heat treatment at 600°C for 6 hours in an oxygen atmosphere, then continue to heat up to 800°C for sintering for 15 hours, and naturally cool to room temperatur...

Embodiment 3

[0036] (1) Weigh 0.05mol of (Ni 0.7 co 0.2 Fe 0.1 )(OH) 2 For the precursor material, disperse it in 400ml deionized water, and sonicate it for 1 hour. Then, weigh 0.2g of molybdenum acetylacetonate and add it into deionized water to form a 0.05mol / L molybdenum source solution, add the prepared molybdenum source solution dropwise into the solution containing the precursor material, and evenly stir and evaporate at 80°C. After drying, it was dried at 100° C. for 20 hours.

[0037] (2) Weigh 0.0524mol of lithium nitrate and mix it with the material prepared in the above step (1), add 50mL of absolute ethanol as a dispersant, ball mill for 10 hours, dry and press into tablets to obtain precursor tablets. First put the precursor sheet into a tube furnace, heat treatment at 550°C for 6 hours in an oxygen atmosphere, then continue to heat up to 700°C for 24 hours, and cool naturally to room temperature to obtain the finished Li 2 MoO 4 Surface Modified LiNi 0.8 co 0.15 al 0...

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Abstract

The invention discloses a lithium molybdate surface modified lithium ion battery nickel-rich positive pole material and a preparation method thereof. The chemical formula of the lithium ion battery nickel-rich material is LiNiaCobM1-a-bO2, wherein a and b are the mole number, a is larger than or equal to 0.5 and is smaller than or equal to 1, b is larger than or equal to 0 and is smaller than or equal to 0.2, M is one or more of Mn, Al and Fe, Li2MoOx is surface modified layer material lithium molybdate, and x is larger than or equal to 3 and is smaller than or equal to 4. The lithium molybdate surface modified lithium ion battery nickel-rich positive pole material is prepared through simple liquid phase precursor preparation, surface modification and high-temperature solid phase sintering reaction. The lithium molybdate surface modification layer has the good lithium ionic conductivity, and is beneficial to lithium ion de-intercalation. By means of the lithium molybdate surface modified lithium ion battery nickel-rich positive pole material, the rate capability, cycle performance and safety of the nickel-rich positive pole material can be greatly improved; according to the preparation method, raw materials are easy to obtain, operation is easy, the cost is low, and industrial large-scale production is easy to achieve.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium-ion battery electrode materials, and in particular relates to a lithium-molybdate surface-modified lithium-ion battery nickel-rich positive electrode material and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of electric vehicles and hybrid vehicles, lithium-ion batteries as power batteries have broad application prospects. Ternary material is a new type of lithium-ion battery cathode material that has been studied more in recent years. It has the characteristics of high specific energy, low preparation cost, and good safety, and shows excellent comprehensive performance. However, how to further improve its energy density and power density is the key to its wide application in the field of power batteries. Studies have shown that nickel-rich cathode materials (Ni≥50%) have high reversible specific capacity and good cycle sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505H01M4/485H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 杨成浩欧星熊训辉刘美林
Owner SOUTH CHINA UNIV OF TECH
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