Yttrium-doped lithium-rich manganese-based lithium ion battery positive electrode material, preparation method thereof and lithium ion battery

A lithium-rich manganese-based lithium and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as the influence of doping effects, improve capacity decay and voltage decay problems, increase deintercalation rate, improve The effect of cycle performance

Inactive Publication Date: 2020-04-28
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of them are doped with transition metal ions, but the parameters of different doping elements have different effects on the doping effect.

Method used

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  • Yttrium-doped lithium-rich manganese-based lithium ion battery positive electrode material, preparation method thereof and lithium ion battery
  • Yttrium-doped lithium-rich manganese-based lithium ion battery positive electrode material, preparation method thereof and lithium ion battery
  • Yttrium-doped lithium-rich manganese-based lithium ion battery positive electrode material, preparation method thereof and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This example prepares yttrium-doped lithium-rich manganese-based cathode material Li 1.2 Ni 0.2 mn 0.57 Y 0.03 o 2 .

[0035] Weigh 12.852g (0.126mol) of lithium acetate dihydrate, 13.965g (0.057mol) of manganese acetate tetrahydrate, 5.816g (0.020mol) of nickel nitrate hexahydrate, 1.149g (0.003mol) of yttrium nitrate hexahydrate, mix and add 50mL Ethanol solution, heated in a water bath, and kept stirring until fully dissolved and mixed, put the liquid in a drying oven for evaporation and drying, and put the dried material in a tube furnace to heat up from room temperature at a rate of 5°C / min Pre-fired at a low temperature of 450°C for 1 hour, then raised the temperature to 900°C at a rate of 5°C / min and continued to calcine for 12 hours, and then took it out of the furnace and cooled it rapidly (cooling rate was about 20°C / min) to obtain yttrium-doped Lithium-rich manganese-based cathode materials. The sample particles prepared by this reaction are polyhedral,...

Embodiment 2

[0040] This embodiment prepares the lithium-rich manganese-based cathode material Li without doping yttrium. 1.2 Ni 0.2 mn 0.6 o 2 .

[0041] The preparation method and steps of this example are basically the same as those of Example 1, except that yttrium nitrate is not added.

[0042] After mixing the raw materials of 0.126mol lithium acetate dihydrate, 0.060mol manganese acetate tetrahydrate, and 0.020mol nickel nitrate hexahydrate, add 50mL of ethanol solution, put it in a water bath for heating, and continue to stir until it is fully dissolved and mixed. Put it into a drying oven for evaporative drying, put the dried material into a tube furnace from room temperature at a rate of 5 °C / min to 450 °C for low temperature pre-burning for 1 hour, and then at a rate of 5 °C / min to 900 °C for After calcination for 12 hours, the lithium-rich manganese-based positive electrode material without yttrium was obtained after being taken out of the furnace and cooled rapidly (coolin...

Embodiment 3

[0046] This example prepares yttrium-doped lithium-rich manganese-based cathode material Li 1.2 Ni 0.2 mn 0.59 Y 0.01 o 2 .

[0047] The preparation method and steps of this example are basically the same as those of Example 1, except that 0.001 mol of yttrium nitrate hexahydrate and 0.059 mol of manganese acetate tetrahydrate are added.

[0048] After mixing the raw materials of 0.126mol lithium acetate dihydrate, 0.059mol manganese acetate tetrahydrate, 0.001mol yttrium nitrate hexahydrate, and 0.020mol nickel nitrate hexahydrate, add 50mL ethanol solution, put into a water bath and heat, and continue to stir until Fully dissolve and mix, put the liquid into a drying oven for evaporative drying, put the dried material into a tube furnace from room temperature at a rate of 5°C / min to 450°C for 1 hour at a low temperature, and then pre-fire at a rate of 5°C / min The temperature was raised to 900° C. for 12 hours, and the yttrium-doped lithium-rich manganese-based positive ...

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Abstract

The invention discloses an yttrium-doped lithium-rich manganese-based lithium ion battery positive electrode material, a preparation method thereof and a lithium ion battery. The yttrium-doped lithium-rich manganese-based positive electrode material is a layered material, the chemical general formula of the yttrium-doped lithium-rich manganese-based positive electrode material is Li1.2Ni0.2Mn<0.6-x>YxO2, and x is greater than 0 and less than or equal to 0.04. The preparation method comprises the steps of adding a lithium source, a nickel source, a manganese source and a yttrium source into analcohol solvent, dissolving and mixing to obtain a metal salt solution, and drying the metal salt solution to obtain an intermediate; heating and sintering the intermediate to obtain a sintered product; and cooling to obtain the yttrium-doped lithium-rich manganese-based positive electrode material. According to the invention, a high-temperature solid-phase method is adopted for preparation, the process is simple and convenient, reaction parameters are easy to control, powder particles are free of agglomeration, the filling property is good, and the yield is high; and the prepared structure isstable, good in cycle performance and excellent in rate capability, and can effectively inhibit capacity and voltage attenuation in the cycle process.

Description

technical field [0001] The invention relates to a lithium battery cathode material, a preparation method and the lithium battery, in particular to an yttrium-doped lithium-rich manganese-based lithium ion battery cathode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] In recent years, lithium-ion batteries have been more and more widely used in the market, and their high-capacity, light-weight and other characteristics make them widely used in electric vehicles and portable mobile phone equipment and other fields. With the development of society, the application requirements are getting higher and higher, so lithium-ion batteries with excellent performance are required to meet social needs. A key factor that determines the performance of lithium-ion batteries is the selection and modification of their cathode materials. Lithium-rich cathode materials have attracted widespread attention due to their high capacity, high operati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525H01M2004/8689Y02E60/50Y02E60/10
Inventor 杨培刘建国
Owner NANJING UNIV
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