Nano rod-shaped nickel-lithium manganate cathode material and preparation method thereof

A positive electrode material, lithium nickel manganese oxide technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of poor cycle stability of lithium-ion batteries, achieve improved cycle stability, reduce Side reaction, effect of structure stabilization

Active Publication Date: 2015-03-11
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] During the charging and discharging process of the lithium ion battery prepared by the lithium nickel manganese oxide spherical material provided by the prior art, increasing the cut-off voltage will easily change the structure of the lithium nickel manganese oxide material, resulting in poor cycle stability of the lithium ion battery.

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  • Nano rod-shaped nickel-lithium manganate cathode material and preparation method thereof
  • Nano rod-shaped nickel-lithium manganate cathode material and preparation method thereof

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preparation example Construction

[0028] On the one hand, an embodiment of the present invention provides a method for preparing a nanorod-shaped lithium nickel manganese oxide positive electrode material, the method comprising:

[0029] Step 101, according to the chemical formula LiNi 0.5 mn 1.5 o 4 The substance ratio of each element is dissolved in distilled water with a predetermined amount of manganese salt and persulfide, and a mixed solution is obtained after stirring evenly.

[0030] Step 102, performing airtight heat treatment on the mixed solution obtained in step 101 to obtain MnO 2 precipitation, and the MnO 2 The precipitate is washed and dried to obtain MnO 2 Nano stave.

[0031] Step 103, the MnO obtained in step 102 2 Nanorods and nickel salts are mixed in a polar solvent and dispersed ultrasonically, and then an alkaline solution is added dropwise to the polar solvent to obtain nickel-manganese hydroxide precipitation, and the nickel-manganese hydroxide precipitation Washing and drying ...

Embodiment 1

[0049] This embodiment provides a nanorod-shaped lithium nickel manganese oxide positive electrode material, the preparation method of which comprises the following steps:

[0050] According to the chemical formula LiNi 0.5 mn 1.5 o 4 For the ratio of substances of each element, 3.38g of manganese sulfate monohydrate and 4.76g of sodium persulfate were dissolved in 100ml of distilled water, and stirred evenly by magnetic force to obtain a mixed solution with a concentration of 0.02mol / L.

[0051] Carry out airtight heat treatment on the mixed solution obtained above, the heating time is 15h, and the heating temperature is 180°C. After the reaction is complete, MnO 2 Precipitate, after filtering and washing the precipitate, heat and dry it in the air at 100°C for 6h to obtain MnO 2 Nano stave.

[0052] 0.87g MnO 2 Ultrasonic dispersion of nanorods and 7.89g nickel sulfate hexahydrate in 200ml ethanol solution, then in this ethanol solution, dropwise adding 100ml concentrat...

Embodiment 2

[0056] This embodiment provides a nanorod-shaped lithium nickel manganese oxide positive electrode material, the preparation method of which comprises the following steps:

[0057] According to the chemical formula LiNi 0.5 mn 1.5 o 4 For the ratio of substances of each element, 3.78g of manganese chloride and 8.11g of potassium persulfate were dissolved in 300ml of distilled water, and magnetically stirred to mix evenly to obtain a mixed solution with a concentration of 0.01mol / L.

[0058] Carry out airtight heat treatment on the mixed solution obtained above, the heating time is 8h, and the heating temperature is 130°C. After the reaction is complete, MnO 2 Precipitate, after filtering and washing the precipitate, heat and dry it in the air at 80°C for 12h to obtain MnO 2 Nano stave.

[0059] 0.87g MnO 2 Nano-rods and 3.91g nickel chloride are ultrasonically dispersed in 200ml aqueous solution, and then in this aqueous solution, dripping 120ml concentration is the potas...

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Abstract

The invention discloses a nano rod-shaped nickel-lithium manganate cathode material and a preparation method thereof, and belongs to the field of lithium battery cathode materials. The preparation method comprises the following steps: according to the ratio of amount of substance of the chemical formula (LiNi<0.5>Mn<1.5>O4), dissolving manganese salts and persulfide into distilled water, evenly stirring to obtain a mixed solution; sealing and heating the mixed solution to obtain MnO2 precipitate, washing and drying the MnO2 precipitate to obtain MnO2 nano rods; mixing the MnO2 nano rods and nickel salts in a polar solvent, carrying out supersonic dispersing, then dropwise adding an alkaline solution into the polar solvent to obtain nickel hydroxide and manganese hydroxide precipitate; washing and drying the precipitate, wherein during the dropwise addition process, the reaction system is sealed and heated; mixing the dried hydroxide precipitate with lithium salts, grinding the mixture, and then calcining the mixture so as to obtain the nano rod-shaped nickel-lithium manganate cathode material. The nickel-lithium manganate prepared by the provided method has a nano rod shape and has the advantages of stable structure and high cycle stability.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a positive electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium nickel manganese oxide (LiNi 0.5 mn 1.5 o 4 ) is a lithium-ion battery cathode material with excellent electrochemical performance. It has the advantages of large reversible capacity, good cycle performance, and high working voltage (5V). It is often used to prepare lithium-ion batteries with high specific capacity and high energy density. . Therefore, it is necessary to provide a method for preparing lithium nickel manganese oxide cathode material. [0003] For example, CN103579607A provides a method for preparing a spherical lithium nickel manganese oxide positive electrode material, comprising the following steps: weighing lithium source compound, nickel source compound and spherical trimanganese tetraoxide acc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 朱广燕海滨陈效华
Owner CHERY AUTOMOBILE CO LTD
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