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Spherical lithium-enriched anode material with gradient concentration and preparation method thereof

A lithium-rich positive electrode material with a gradual change in concentration technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of low compaction density, environmental pollution, and low tap density of ternary materials, and achieve excellent cycle life and thermal stability. The effects of stability, simple and easy-to-control preparation process, and good application prospects

Active Publication Date: 2013-01-23
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, lithium cobalt oxide has been gradually replaced due to the disadvantages of scarcity of drilling resources, high cost and environmental pollution. Its development space has been gradually replaced; lithium manganese oxide discharge specific capacity is low, high temperature cycle and storage performance are not good; ternary materials are compacted The density is low, and its rate performance and safety performance need to be improved; the discharge specific capacity of lithium iron phosphate is not high, the tap density is low, and there are serious consistency problems in the product, which hinders its rapid development

Method used

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  • Spherical lithium-enriched anode material with gradient concentration and preparation method thereof
  • Spherical lithium-enriched anode material with gradient concentration and preparation method thereof
  • Spherical lithium-enriched anode material with gradient concentration and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) nickel sulfate (NiSO 4 ·6H 2 O), manganese sulfate (MnSO 4 ·H 2 O), cobalt sulfate (NiSO 4 ·7H 2 O) mix by Ni: Mn: Co (molar ratio)=1: 1: 1 ratio, be dissolved in deionized water, be mixed with the mixed salt solution A that total metal ion concentration is 1.5mol / L; Take a certain amount of sulfuric acid Manganese (MnSO 4 ·H 2 O) be dissolved in deionized water, be mixed with the manganese salt solution B that total metal ion concentration is 1.5mol / L; Prepare the Na that concentration is 1.5mol / L respectively 2 CO 3 Alkaline solution and ammonia water with a concentration of 0.3mol / L.

[0027] (2) Add the manganese salt solution B (500mL) prepared in step (1) into the mixed salt solution A (500mL) under stirring through a constant flow pump, and at the same time, mix the mixed salt solution A and B The solution is added into the reaction kettle through a constant flow pump, Na 2 CO 3 Alkali solution and ammonia water are respectively fed into the reacti...

Embodiment 2

[0032] (1) nickel sulfate (NiSO 4 ·6H 2 O), manganese sulfate (MnSO 4 ·H 2 O) mix by Ni:Mn (molar ratio)=1:1 ratio, dissolve in deionized water, be mixed with the mixed salt solution A that the total metal ion concentration is 2.0mol / L; Take a certain amount of manganese sulfate (MnSO 4 ·H 2 O) be dissolved in deionized water, be mixed with total metal ion concentration and be the salt solution B of 2.0mol / L; Prepare the Na that concentration is 2.0mol / L respectively 2 CO 3 Alkaline solution and ammonia water with a concentration of 0.4mol / L.

[0033] (2) Add the manganese salt solution B (400mL) prepared in step (1) into the mixed salt solution A (600mL) under stirring through a constant flow pump, and at the same time, mix the mixed salt solution A and B The solution is added into the reaction kettle through a constant flow pump, Na 2 CO 3 Alkaline solution and ammonia water are respectively fed into the reaction kettle in parallel through a constant flow pump, the s...

Embodiment 3

[0037] (1) nickel sulfate (NiSO 4 ·6H 2 O), manganese sulfate (MnSO 4 ·H 2 O), cobalt sulfate (NiSO 4 ·7H 2 O) mix by Ni: Mn: Co (molar ratio)=4: 4: 2 ratio, be dissolved in deionized water, be mixed with the mixed salt solution A that total metal ion concentration is 2.0mol / L; Take a certain amount of sulfuric acid Manganese (MnSO 4 ·H 2 O) be dissolved in deionized water and be prepared into a salt solution B with a total metal ion concentration of 2.0mol / L; prepare a NaOH alkali solution with a concentration of 4.0mol / L and ammoniacal liquor with a concentration of 4.0mol / L respectively.

[0038] (2) Add the manganese salt solution B (300mL) prepared in step (1) into the mixed salt solution A (700mL) under stirring through a constant flow pump, at the same time, mix the mixed salt solution A and B The solution is added to the reactor through a constant flow pump, NaOH alkali solution and ammonia water are respectively fed into the reactor in parallel through a consta...

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Abstract

The invention discloses a preparation method of a spherical lithium-enriched anode material with gradient concentration. The invention has the technical effects as follows: a controlled crystallization coprecipitation method is adopted to prepare the spherical lithium-enriched anode material with the gradient concentration, the Mc concentration of the spherical lithium-enriched anode material gradually increases from cores of spherical particles to surface layers, and the concentrations of Ni and Co gradually decrease from the cores of the spherical particles to the surface layers. The spherical lithium-enriched anode material not only has the characteristic of high specific capacity of the lithium-enriched anode material, but also acquires more excellent cyclic life and thermal stability through gradient Mn concentration, and can meet the requirements of electric vehicles and other fields for the service of motive power supply. The preparation method is simple in preparation process, easy to control, low in raw material cost and friendly to environment, can be applied to large-scale industrialization, and has a good application prospect.

Description

technical field [0001] The invention relates to a spherical lithium-rich cathode material with gradually changing concentration and a preparation method thereof, belonging to the field of cathode materials and electrochemistry of lithium ion batteries. Background technique [0002] As a secondary energy source, lithium-ion batteries have outstanding advantages such as high energy density, long cycle life, low self-discharge rate, no memory effect, and environmental protection. It is a new type of green secondary battery successfully developed in the 1990s. In recent years, with the popularization of electric vehicles under the new energy strategy, environmental protection issues of lead-acid batteries, soaring oil prices and many other factors, the emerging fields of lithium-ion batteries and related products have developed rapidly. However, there are still many technical problems in the current lithium-ion battery system that need breakthroughs and solutions, such as low en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 王先友杨秀康邹贵山胡亮舒洪波刘黎胡海袁好魏启亮胡本安
Owner XIANGTAN UNIV
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