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Multi-element composite positive pole material for lithium secondary battery and preparation thereof

A secondary battery and multi-component composite technology, which is applied in secondary batteries, electrode manufacturing, battery electrodes, etc., can solve the problems of affecting material cycle performance, material instability, and no advantage in gram specific capacity, etc., and achieve excellent physical and electrochemical performance, improved uniformity, and improved unit cell development

Active Publication Date: 2009-07-08
XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This technology allows for precise control over how well an aluminum nitride (AlN) ceramic body will grow into small particles without damaging its shape or even affecting their final performance. It achieves this by controllably creating tiny droplets containing specific chemical substances called seeders at different stages within a reactor chamber where AlN grains form together under certain conditions. By adjusting these factors, it becomes possible to produce consistently high purities of smaller sizes than previously achievable. Additionally, there're various methods available for producing thin films on substrates like SiC wafers. Overall, this technology improves manufacturing efficiency while maintaining excellent qualitative characteristics such as strength and durability.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the cycling behavior and durability of LIB sintered oxide based positive temperature coefficient (PTC) type lithiated transition metals used in redox flow cells while maintaining their superior heat capacities and stable chemical nature. Existing solutions like expensive raw materials limit its potential applications due to low volumetric efficiency and instabilities caused by excessive ratios of trivalent iron sources.

Method used

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  • Multi-element composite positive pole material for lithium secondary battery and preparation thereof
  • Multi-element composite positive pole material for lithium secondary battery and preparation thereof
  • Multi-element composite positive pole material for lithium secondary battery and preparation thereof

Examples

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Embodiment 1

[0027] Mn(NO 3 ) 2 , Co(NO 3 ) 2 , Ni(NO 3 ) 2 Mn in molar ratio 2+ / Co 2+ / Ni + =Mix in the ratio of 3:2:5 and dissolve in deionized water to form 【Mn 2+ +Co 2+ +Ni + 】A mixed salt solution with a total metal ion concentration of 2.0 mol / L, a NaOH solution with a concentration of 4 mol / L, and an ammonia solution with a concentration of 6.0 mol / L. The mixed three kinds of solutions (salt solution, NaOH solution and ammonia solution) are slowly and dropwise added to the ternary reactor with liquid flow turbine circulation, under the protection of nitrogen or other inert gases, the precipitation of the sediment is controlled in a batch operation. For crystallization and growth, the reaction temperature is controlled to 50°C, the stirring speed is 600r / min, the pH value is 11, and the reaction time is 48 hours. After the reaction is completed, the reaction product is washed with deionized water several times until the pH of the filtrate is neutral, and then dried at 100°C for 12 hour...

Embodiment 2

[0033] Mn(NO 3 ) 2 , Co(NO 3 ) 2 , Ni(NO 3 ) 2 Mn in molar ratio 2+ / Co 2+ / Ni + =Mix in the ratio of 2:2:6, dissolve in deionized water, and mix into 【Mn 2+ +Co 2+ +Ni + 】A mixed salt solution with a total metal ion concentration of 1.5 mol / L, a NaOH solution with a concentration of 3 mol / L, and an ammonia solution with a concentration of 5 mol / L. The three solutions are slowly added dropwise to a three-element reactor with liquid flow turbine circulation, under the protection of nitrogen or other inert gases, and the crystallization and growth of the precipitate are controlled in a batch operation mode, and the reaction temperature is controlled to 60°C. The stirring speed is 400r / min, the pH value is 11.5, and the reaction time is 36 hours. After the completion of the reaction, the reaction product was washed with deionized water several times until the pH of the filtrate was neutral, and then dried at 100°C for 12 hours to obtain a precursor with dense crystals, spherical morp...

Embodiment 3

[0038] Mn(NO 3 ) 2 , Co(NO 3 ) 2 , Ni(NO 3 ) 2 Mn in molar ratio 2+ / Co 2+ / Ni + =Mix in the ratio of 2:1:7, dissolve in deionized water, and mix into 【Mn 2+ +Co 2+ +Ni + 】A mixed salt solution with a total metal ion concentration of 1.8mol / L, a NaOH solution with a concentration of 2.5mol / L, and an ammonia solution with a concentration of 5mol / L. The three solutions are slowly added dropwise to a three-element reactor with liquid flow turbine circulation, under the protection of nitrogen or other inert gases, and the crystallization and growth of the precipitate are controlled in a batch operation mode, and the reaction temperature is controlled to 60°C. The stirring speed is 300r / min, the pH value is 11, and the reaction time is 36 hours. After the completion of the reaction, the reaction product was washed with deionized water several times until the pH of the filtrate was neutral, and then dried at 100°C for 12 hours to obtain a precursor with dense crystals, spherical morphol...

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Abstract

The invention discloses a multi-element composite positive electrode material of a Li-ion secondary battery and the preparation method thereof. The multi-element composite positive electrode material with a spherical shape, narrow particle size distribution, consistency equal to or less than 0.3 and tap density equal to or larger than 2.2 g/cm is represented by a chemical formula LiNixCoyMnzO2, where x is not less than 0.5 and not larger than 1, y is not less than 0 and not larger than 0.2, z is not less than 0 and not larger than 0.3, and the summation of x, y and z is equal to 1. The preparation method comprises the following steps: controlling the crystallization and precipitation of Ni, Co and Mn salt solution to obtain Ni-Mn-Co precipitate with narrow particle size distribution and satisfactory consistency and tap density; washing and drying to obtain a precursor; mixing the precursor with a Li compound in deionized water, and drying to obtain a mixed material; sintering the dried material, crushing and classifying to obtain a primary material; and sintering the primary material, screening and classifying to obtain the final product. The method can improve the specific capacity of the material and control the profile and the particle size of the material, thereby improving the material stability.

Description

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Claims

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Application Information

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Owner XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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