Preparation method for lithium ion battery positive electrode material with 4.5 V voltage platform

A lithium-ion battery, cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as reports that are not practical, and achieve the effects of small uniformity differences, high electrochemical activity, and batch stability.

Active Publication Date: 2015-06-24
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many literature reports that surface coating can be used to reduce interface reaction, but it is currently limited to laboratory research, and there has been no practical report

Method used

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  • Preparation method for lithium ion battery positive electrode material with 4.5 V voltage platform
  • Preparation method for lithium ion battery positive electrode material with 4.5 V voltage platform

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 54.9g lithium sulfate (Li 2 SO 4 , with Li + 1mol), 77.3g anhydrous nickel sulfate (NiSO 4 , 0.5mol), 226.4g anhydrous manganese sulfate (MnSO 4 , 1.5mol) prepared, dissolved with an appropriate amount of pure water and stirred evenly, added water to make a 15L solution (total weight about 15256g. At this time, the concentration of metal ions in the solution was 0.2mol / L. After dissolving, add 54.17g (mass percentage concentration 22~28%) ammonia water as a complexing agent. Then put the solution into a sealed container. Heat the solution to 150°C, and in a stirring state, use a high-pressure pump to continuously add a lithium hydroxide solution with a concentration of 0.5mol / L. Until the pH value reaches 10. Stir at constant temperature for 10 hours, lower the temperature, filter and wash the product to remove soluble sulfate ions and metal ions, and dry at 120°C to obtain LiNi 0.5 mn 1.5 o 4 Material.

[0026] attached figure 1The electron micrograph of the mi...

Embodiment 2

[0028] 54.9Kg lithium sulfate (Li 2 SO 4 , with Li + 1000mol), 77.3Kg anhydrous nickel sulfate (NiSO 4 , 500mol), 226.4Kg anhydrous manganese sulfate (MnSO 4 , 1500mol) prepared, dissolved with an appropriate amount of pure water, stirred evenly, and added water to make a 600L solution (total weight about 898.2Kg). At this time, the concentration of metal ions in the solution was 5 mol / L. After dissolving, add 44.91Kg ethylenediaminetetraacetic acid (EDTA) as complexing agent. Then put the solution in an airtight container. Heat the solution to 200°C, and continuously add sodium hydroxide solution with a concentration of 5 mol / L with a high-pressure pump under stirring until the pH value reaches 13. Stir at constant temperature for 24 hours, lower the temperature, filter and wash the product to remove soluble sulfate ions and metal ions, and dry at 150°C to obtain LiNi 0.5 mn 1.5 o 4 Material. The crystal form of product, particle size are the same as embodiment 1. ...

Embodiment 3

[0031] 68.9g lithium nitrate (LiNO 3 , with Li + 1mol), 91.3g anhydrous nickel nitrate (Ni(NO 3 ) 2 , 0.5mol), 268.4g anhydrous manganese nitrate (Mn(NO 3 ) 2 , 1.5mol) is prepared, dissolved with an appropriate amount of pure water, stirred evenly, and added with water to make a 3L solution (total weight about 3205g). At this time, the concentration of metal ions in the solution is 1 mol / L. Add 32.05g of thiocyanic acid as complexing agent. Then put the solution in an airtight container. Heat the solution to 180°C, and continuously add sodium hydroxide solution with a concentration of 2 mol / L with a high-pressure pump under stirring until the pH value reaches 11. Stir at constant temperature for 20 hours, lower the temperature, filter and wash the product to remove soluble sulfate ions and metal ions, and dry at 130°C to obtain LiNi 0.5 mn 1.5 o 4 Material.

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Abstract

The invention relates to a preparation method for a lithium ion battery positive electrode material with a 4.5 V voltage platform. The preparation method comprises the following steps: preparing a soluble lithium salt compound, a soluble nickel salt compound and a soluble manganese salt compound according to a metal ion molar ratio of Li to Ni to Mn of 1:0.5:1.5, dissolving, and uniformly stirring, wherein the total concentration of the metal ions in the solution is 0.2-5 mol / L; adding a complexing agent after dissolving, placing the solution into a sealed container, heating the solution to a temperature of 150-200 DEG C, and adding a lithium hydroxide or sodium hydroxide solution with a concentration of 0.5-5 mol / L under a stirring state until the pH value achieves 10-13; and carrying out constant temperature stirring for 10-24 h, cooling, and sequentially carrying out filtering, washing and drying on the product to obtain the LiNi0.5Mn1.5O4 material. The prepared LiNi0.5Mn1.5O4 material has characteristics of uniform component distribution and stable crystal structure, wherein 0.2 C (1 C is 147 mA / g) discharge capacity at a room temperature can be 132 mAh / g, the voltage platform is stabilized to more than 4.7 V, and uniformity different between batches is less.

Description

technical field [0001] The technical solution of the present invention relates to a manufacturing technology of lithium-ion battery anode materials with a voltage platform of 4.5V, specifically the composition is LiNi 0.5 mn 1.5 o 4 Lithium-ion battery cathode material preparation method. Background technique [0002] Electric vehicles are my country's strategic industry direction, which can effectively solve the problems of insufficient oil, deteriorating air quality, and high energy consumption per unit of GDP. However, the current low specific energy of batteries has become a bottleneck hindering the practical progress of electric vehicles. The specific energy of the lead-acid battery is only 30-40Wh / Kg, and that of the Ni-MH battery is 60-80Wh / Kg. Among lithium-ion batteries, lithium iron phosphate batteries can reach 110-130Wh / Kg, and ternary material batteries with the highest specific energy can only reach about 210-220Wh / Kg. Calculated on the basis that a car ne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48
CPCY02E60/10
Inventor 梁广川王丽欧秀芹焦昌梅
Owner HEBEI UNIV OF TECH
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