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Lithium molybdate coated lithium-rich manganese-based positive electrode material as well as preparation method and application thereof

A cathode material, lithium-rich manganese technology, applied in the field of materials, can solve problems such as reducing the specific capacity of the battery

Active Publication Date: 2021-07-06
江苏蓝固新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, it is necessary to develop a lithium-rich manganese-based cathode material with stable structure and excellent cycle performance, and at the same time make up for the lack of non-bulk phase coating and reduce the specific capacity of the battery.

Method used

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  • Lithium molybdate coated lithium-rich manganese-based positive electrode material as well as preparation method and application thereof
  • Lithium molybdate coated lithium-rich manganese-based positive electrode material as well as preparation method and application thereof
  • Lithium molybdate coated lithium-rich manganese-based positive electrode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Step 1, 0.012mol of MnSO 4 Dissolved in 840ml of water to obtain liquid A, 0.12mol of NH 4 HCO 3 Dissolve in 840ml of water to obtain liquid B; add 168ml of ethanol to liquid A, stir for 20 minutes to obtain solution C; slowly pump liquid B into liquid C and stir for 2 hours, collect gray-black precipitate, and calcinate in air at 300°C 2 hours, get MnO 2 ball.

[0061] Step 2, according to the molar ratio of 0.54:0.13:0.13:1.2 MnO 2 , nickel nitrate, cobalt nitrate, lithium hydroxide are added in the mixed solution of ethanol and water (v:v=1:1), carry out ball mill mixing 12 hours with rotating speed 250r / min, carry out pre-calcination after evaporated solvent then, The pre-firing is to keep the temperature at 450°C for 6 hours, and then raise the temperature to 750°C for 10 hours. The black lithium-rich manganese-based precursor powder is obtained after pre-calcination.

[0062] Step 3, configure ammonium molybdate, lithium hydroxide, and lithium-rich manganese...

Embodiment 2

[0067] Step 1, 0.006mol of MnSO 4 Dissolved in 420ml of water to obtain liquid A, 0.06mol of NH 4 HCO 3 Dissolve in 420ml of water to obtain solution B; add 84mL of ethanol to solution A, stir for 40min to obtain solution C. After slowly pumping liquid B into liquid C and stirring for 4 hours, the precipitate was collected and calcined at 400°C in air for 3 hours to obtain MnO 2 ball.

[0068] Step 2, according to the molar ratio of 0.52:0.2:0.08:1.2 MnO 2 , nickel oxalate, cobalt acetate, and lithium hydroxide are added to the mixed solution of ethanol and water (v:v=2:1), and the ball milling is carried out at a speed of 270r / min for 14 hours, and then the solvent is evaporated to dryness for pre-calcination. In order to firstly keep the temperature at 450°C for 4 hours, then raise the temperature to 750°C for 8 hours, and obtain black lithium-rich manganese-based precursor powder after pre-calcination.

[0069] Step 3, configure ammonium molybdate, lithium hydroxide, a...

Embodiment 3

[0071] Step 1, 0.012mol of MnSO 4 Dissolved in 420ml of water to obtain liquid A, 0.06mol of NaHCO 3 Dissolve in 420ml of water to obtain solution B, add 84mL of ethanol to solution A, stir for 60min to obtain solution C. Slowly pump liquid B into liquid C and stir for 6 hours, collect the precipitate and calcinate it in air at 450°C for 6 hours to obtain MnO 2 ball.

[0072] Step 2, according to the molar ratio of 0.6:0.2:1.2 MnO 2 , nickel acetate, and lithium hydroxide were added to the mixture of ethanol and water (v:v=1:2), ball milled and mixed for 16 hours at a speed of 240r / min, and then evaporated to dryness for pre-calcination. Keep the temperature at 450°C for 3 hours, and then raise the temperature to 750°C for 6 hours. After pre-calcination, black lithium-rich manganese-based precursor powder is obtained.

[0073] Step 3: Prepare molybdenum trioxide, lithium hydroxide, and lithium-rich manganese-based precursor powder according to the theoretical mass ratio of...

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Abstract

The invention relates to a lithium molybdate coated lithium-rich manganese-based positive electrode material as well as a preparation method and application thereof. The structure of the lithium molybdate coated lithium-rich manganese-based positive electrode material comprises a lithium-rich manganese-based layered oxide inner core and a Li2MoO4 coating layer, and a Mo6+ concentration gradient transition layer exists between the lithium-rich manganese-based layered oxide inner core and the Li2MoO4 coating layer; in the transition layer, the concentration of Mo6+ is gradually reduced from one side of the coating layer to one side of the inner core, and the thickness of the transition layer is 0.1-10 nm; the chemical expression of the Li2MoO4 coated lithium-rich manganese-based layered oxide positive electrode material is xLi[Li0.33Mn0.67]O2.(1-x)LiMO2@Li2MoO4, 0<x<1, wherein M at least comprises two elements of Mn, Ni, Co, Al and Mg.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a lithium-rich manganese-based cathode material coated with lithium molybdate, a preparation method and application thereof. Background technique [0002] Compared with traditional secondary batteries, lithium-ion batteries have the characteristics of high energy density, long cycle life, good safety performance, and low pollution, which just meet the needs of social development. However, in the current traditional lithium-ion battery system, the charge and discharge capacity of the positive electrode material is almost close to the limit (120-200mAh g -1 ), with the continuous development of the power battery market, this cannot meet people's demand for higher energy density lithium-ion batteries. The layered lithium-rich manganese-based oxide cathode material is due to its high energy density (>1000Wh·kg -1 ) has attracted the attention of the market. [0003] Lithium-r...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/36H01M4/485H01M4/505H01M4/525H01M4/131H01M10/0525C01G39/00C01G45/12C01G53/00
CPCH01M4/366H01M4/628H01M4/505H01M4/525H01M4/485H01M4/131H01M10/0525C01G53/50C01G39/00C01G45/1228C01P2004/80C01P2002/72Y02E60/10
Inventor 王丽平罗春牛晓滨
Owner 江苏蓝固新能源科技有限公司
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