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A kind of preparation lini x mn 1-x o 2 Binary Cathode Material Approach

A cathode material, mixed alkaline solution technology, applied in the field of new energy materials, can solve the problems of crystal structure and electrochemical performance, complex synthesis process, high reaction energy consumption, and achieve stable morphology, short process flow, and complete precipitation. Effect

Active Publication Date: 2020-03-03
四川新锂想能源科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the synthesis process of Ni-Mn binary cathode materials is relatively complicated, and the preparation method and chemical composition have an important impact on the crystal structure and electrochemical performance of the material.
At present, the actual specific capacity (150~160mAh / g), cycle and rate performance of commonly used ternary materials still have room for improvement. The content of Co in the material is optimized and reduced, which can further reduce the cost; the conventional liquid phase synthesis of the precursor takes a long time , the reaction energy consumption is high

Method used

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  • A kind of preparation lini <sub>x</sub> mn <sub>1-x</sub> o <sub>2</sub> Binary Cathode Material Approach
  • A kind of preparation lini <sub>x</sub> mn <sub>1-x</sub> o <sub>2</sub> Binary Cathode Material Approach

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Add 2.0 mol NiSO 4 •6H 2 O, 0.5 mol MnSO 4 •H 2 O mixed, at room temperature, add 1.25 L deionized water to configure the binary metal ion mixture. Add an appropriate amount of 25% ammonia water to 2L of 4.0 mol / L NaOH solution to form an ammonia water-NaOH mixed solution.

[0021] (2) Add the binary metal ion mixed solution and the ammonia water-NaOH mixed solution evenly and dropwise at a flow rate of 5 mL / min into a microwave reactor at 55 °C with nitrogen protection at a constant speed, and wait for the binary metal ions to mix. After the dropwise addition was complete, the reaction was stirred for 2 min. Then the reaction solution was transferred into a hydrothermal reaction kettle, and after the reaction kettle was sealed, the reaction was kept at 110°C for 60 min.

[0022] (3) After the above reaction is completed, separate the solid from the liquid, wash with deionized water until neutral, place the filtrate in a drying oven, and dry at 100°C for 24 hou...

Embodiment 2

[0025] (1) Add 1.5 mol NiSO 4 •6H 2 O, 1.0 mol MnSO 4 •H 2 O mixed, at room temperature, add 1.5 L deionized water to configure nickel-manganese binary metal ion mixture. An appropriate amount of 25% ammonia water was added to 1.0 L of 4.0 mol / L NaOH solution to form an ammonia water-NaOH mixed solution.

[0026] (2) At 20°C, the binary metal ion mixed solution and the ammonia water-NaOH mixed solution were evenly added dropwise at a flow rate of 4.0 mL / min into a microwave reactor at 40°C with nitrogen protection at a constant speed, and waited for two After the metal ion mixture was added dropwise, the reaction was stirred for 5 min. The reaction solution was then transferred into a hydrothermal reaction kettle, and the reaction kettle was sealed and reacted at 80° C. for 2 h.

[0027] (3) After the above reaction is completed, separate the solid from the liquid, wash with deionized water until neutral, put the filtrate in a drying oven, and dry at 110°C for 16 hours. ...

Embodiment 3

[0030] (1) Add 0.70 mol Ni(NO 3 ) 2 •6H 2 O and 0.30 mol Mn(NO 3 ) 2 (50% solution) was dissolved in deionized water to prepare a 0.5 mol / L binary metal ion mixture. Add appropriate amount of 25% ammonia water to 1 mol / L NaOH solution to form ammonia water-NaOH mixed solution.

[0031] (2) At 20°C, the binary metal ion mixed solution at a flow rate of 10 mL / min and the ammonia water-NaOH mixed solution at a flow rate of 10 mL / min were added dropwise to a 60°C microwave reactor with constant stirring and nitrogen protection. After the binary metal ion mixture was added dropwise, the reaction was stirred for 0.5 min. Then the reaction solution was transferred into a hydrothermal reaction kettle, and the reaction kettle was sealed and reacted at 120°C for 10 min.

[0032](3) After the above reaction is completed, the solid-liquid separation is carried out, and the filter is washed with deionized water until neutral, and the filtrate is placed in a drying oven and dried at 8...

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Abstract

The invention relates to a method for preparing a LiNixMn1-xO2 binary anode material. The method is characterized by including the following steps that (1) a binary-nickel-and-manganese-salt water solution and a mixed alkali water solution are prepared; (2) the binary-nickel-and-manganese-salt water solution and the mixed alkali water solution are added into a microwave reactor introducing nitrogen for protection in a certain flow velocity respectively, and are stirred and reacted at the constant temperature; (3) a reactant is transferred to a hydrothermal reaction kettle, and a hydrothermal reaction is carried out; (4) coprecipitation matter is filtered, washed and dried; (5) the dried coprecipitation matter is prepared into lithium salt, the mixture is mixed and ground, then the productis put into a sintering furnace and subjected to a high-temperature solid-phase reaction, and the LiNixMn1-xO2 binary anode material is obtained. The initial discharging capacity of the nickel-manganese binary anode material prepared with the method can be 170 mAh / g or above, and the cycle performance is good.

Description

technical field [0001] The invention belongs to the technical field of new energy materials and relates to a method for preparing LiNi x mn 1-x o 2 The method for a binary cathode material, wherein the value of x is 0.6-0.8, is characterized by comprising the following steps. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, long cycle life, and environmental protection, and have become one of the key development targets of new energy and battery industries. Lithium-ion cathode materials that have been commercialized currently mainly include LiCoO 2 , LiMn 2 o 4 、LiFePO 4 , but each has its own deficiencies and defects. Researchers have been working on improving cathode materials for next-generation lithium-ion batteries. [0003] Regardless of the cost of the material, the electrochemical performance of the material, and the safety performance and environmental protection of the material, the Ni-Mn binary cathode materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 姚文俐刘勇
Owner 四川新锂想能源科技有限责任公司
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