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Preparation method of lithium nickel cobalt manganate composite material coated with lithium iron phosphate on surface

A surface-coated technology of lithium iron phosphate and nickel-cobalt lithium manganese oxide, which is applied in the field of new energy material preparation, can solve problems such as poor cycle performance, poor safety, and poor material stability, and achieve improved safety and high capacity. , good cycle performance and safety performance

Active Publication Date: 2015-06-24
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high content of nickel in nickel-cobalt-lithium-manganese-oxide ternary materials, the stability and safety of the material are poor, and the cycle performance of large-capacity nickel-cobalt-lithium-manganese-oxide batteries deteriorates when the charge-discharge cut-off voltage is higher than 4.4V.

Method used

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  • Preparation method of lithium nickel cobalt manganate composite material coated with lithium iron phosphate on surface
  • Preparation method of lithium nickel cobalt manganate composite material coated with lithium iron phosphate on surface
  • Preparation method of lithium nickel cobalt manganate composite material coated with lithium iron phosphate on surface

Examples

Experimental program
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Effect test

example 1

[0025] Example 1 3%LiFePO? Surface coated nickel cobalt manganic acid composite material

[0026] Weigh 0.0771g of LiOH·H?O with a purity of 98%, dissolve it with 40ml of distilled water, add 3g of nickel-cobalt lithium manganate ternary material and 10ml of ethanol to form a mixed solution A and stir at a speed of 300r / min About 20min. Then weigh 0.0692g of H?PO? with a concentration of 85% and add 20ml of distilled water to stir evenly. Add the H?PO? Then weigh 0.1668g of FeSO? 7H?O and add 10ml of distilled water, add the completely dissolved FeSO? Stir for a while. A certain amount of ethanol is added to the stirred material and put into a reaction kettle and put into an oven for hydrothermal reaction, and the temperature is 150° C. for 20 hours. The reacted material was dried under a nitrogen atmosphere at 500° C. for 2 hours after suction filtration and drying. The obtained material was uniformly mixed with acetylene black and PDFE to prepare a positive electrode, an...

example 2

[0027] Example 2 5%LiFePO? surface coated nickel cobalt lithium manganate composite material

[0028] Weigh 0.1285g of LiOH·H?O with a purity of 98%, dissolve it with 40ml of distilled water, add 3g of nickel-cobalt lithium manganate ternary material and 10ml of ethanol to form a mixed solution A and stir at a speed of 400r / min for 10min about. Then weigh 0.1153g of 85% H?PO?, add 20ml of distilled water and stir evenly, add the H?PO? Then weigh 0.2780g of FeSO? 7H?O and add 10ml of distilled water, add the completely dissolved FeSO? Stir for a while. The stirred material is replenished with a certain amount of ethanol and packed into a reactor and put into an oven for hydrothermal reaction, and the temperature is 180° C. for 5 hours. Other processes are identical to Example 1.

example 3

[0029] Example 3 10%LiFePO? surface coated nickel cobalt lithium manganate composite material

[0030] Weigh 0.2576g of LiOH·H?O with a purity of 98%, dissolve it with 40ml of distilled water, add 3g of nickel-cobalt lithium manganate ternary material and 10ml of ethanol to form a mixed solution A and stir at a speed of 400r / min for 10min about. Then weigh 0.2306g of H?PO? with a concentration of 85% and add 20ml of distilled water to stir evenly. Add the H?PO? Then weigh 0.5560g of FeSO? 7H?O and add 10ml of distilled water, add the completely dissolved FeSO? Stir for a while. The stirred material is replenished with a certain amount of ethanol and packed into a reactor and put into an oven for hydrothermal reaction, and the temperature is 180° C. for 5 hours. After the reacted material was suction filtered and dried, it was baked at 500° C. for 2 hours under a nitrogen atmosphere. Other processes are identical to Example 1.

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Abstract

The invention relates to a preparation method of lithium nickel cobalt manganate composite material coated with lithium iron phosphate on the surface and the lithium nickel cobalt manganate composite material has good cycle property and high safety. According to the method, lithium nickel cobalt manganate is subjected to surface coating modification in a way that a hydrothermal method is adopted to grow lithium iron phosphate on the surfaces of the lithium nickel cobalt manganate particles. The lithium iron phosphate is an active cathode material for lithium ion batteries and has better thermal stability, chemical stability, cycle performance and safety performance than lithium cobaltate, lithium nickel cobalt manganate, lithium manganate and the like, so that the problem about safety of the lithium ion batteries made of lithium nickel cobalt manganate under the conditions of high temperature, over-charging and needling can be effectively solved. The composite material is high in energy density, good in cycle performance and safety performance and simple in preparation technology and can be put into industrialization easily.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, and relates to a method for preparing a positive electrode material of a lithium ion battery with good cycle performance and high safety performance—a nickel-cobalt lithium manganese oxide composite material coated with lithium iron phosphate on the surface. Background technique [0002] Energy problems and environmental pollution have become problems that must be solved in the sustainable development strategy of human society. The energy crisis and the environmental problems brought about by the utilization of traditional energy have pushed the development and utilization of new energy to a new level. Countries all over the world Energy development is being taken step by step as an important topic for future development. In order to gradually solve the energy shortage and air pollution problems that restrict the current economic development, lithium-ion batteries have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58
CPCH01M4/366H01M4/505H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 陈召勇许炼朱华丽彭南发
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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