Surface modifying method for lithium nickel manganese oxide positive electrode material

A technology of lithium nickel manganese oxide and surface modification, which is applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problems of uniform and complete coating of difficult materials, large energy consumption, complex process, etc., and achieve improved activation effect, electrical Improved chemical properties and uniform nickel coating

Active Publication Date: 2015-04-22
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that these coating processes require high-temperature roasting to complete the coating modification of the material. The process is compl

Method used

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  • Surface modifying method for lithium nickel manganese oxide positive electrode material
  • Surface modifying method for lithium nickel manganese oxide positive electrode material
  • Surface modifying method for lithium nickel manganese oxide positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Example 1: First, prepare lithium nickel manganese oxide powder, and prepare an activation solution according to the ratio of 80 g of nickel acetate, 96 g of sodium citrate, and 1 L of methanol, and adjust the pH value of the activation solution to 8 with ammonia water; Immerse in the 200mL activation solution prepared above, ultrasonically disperse and activate at room temperature for 30min, filter with suction, and wash with water until neutral; heat the activated lithium nickel manganese oxide at 300°C for 20min in a constant temperature electric heating box to obtain a substrate with elemental nickel on the surface 80.2g (activation treatment is a catalyst for forming a layer of electroless nickel plating on the surface of the nickel-plated substance, so that the nickel plating can proceed smoothly, and the activation solution used can be reused);

[0026] nickel sulfate (NiSO 4 )7g (0.045mol), sodium hypophosphite (NaH 2 PO 2 )7g (0.080mol), ammonium chloride (NH...

Embodiment 2

[0028] Example 2: First, prepare lithium nickel manganese oxide powder, and prepare an activation solution according to the ratio of 80 g of nickel acetate, 96 g of sodium citrate, and 1 L of methanol, and adjust the pH value of the activation solution to 8 with ammonia water; Immerse in the 200mL activation solution prepared above, ultrasonically disperse and activate at room temperature for 40min, filter with suction, and wash with water until neutral; heat the activated lithium nickel manganese oxide at 310°C for 20min in a constant temperature electric heating box to obtain a substrate with elemental nickel on the surface ;

[0029] Dissolve 7g (0.045mol) of nickel sulfate, 7g (0.080mol) of sodium hypophosphite, 3g (0.056mol) of ammonium chloride, and 5g (0.045mol) of sodium lactate in 200mL of deionized water to form a plating solution. The concentration of pH value is 10mL The / L triethanolamine was adjusted to 9, and the surface-activated lithium nickel manganese oxide ...

Embodiment 3

[0030] Example 3: First, prepare lithium nickel manganese oxide powder, and prepare an activation solution according to the ratio of 80 g of nickel acetate, 96 g of sodium citrate, and 1 L of methanol, and adjust the pH value of the activation solution to 8 with ammonia water; mix 80 g of lithium nickel manganese oxide Immerse in the 200mL activation solution prepared above, ultrasonically disperse and activate at room temperature for 40min, filter with suction, and wash with water until neutral; heat the activated lithium nickel manganese oxide at 310°C for 20min in a constant temperature electric heating box to obtain a substrate with elemental nickel on the surface ;

[0031] Dissolve 10g (0.064mol) of nickel sulfate, 10g (0.114mol) of sodium hypophosphite, 3g (0.056mol) of ammonium chloride, and 6g (0.054mol) of sodium lactate in 200mL of deionized water to form a plating solution. The concentration of pH value is 10mL The / L triethanolamine was adjusted to 9, and the surf...

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Abstract

The invention discloses a surface modifying method for a lithium nickel manganese oxide positive electrode material. The surface modifying method comprises the following steps: (1) soaking lithium nickel manganese oxide powder in an activating solution for 10-60 minutes, and washing until the solution is neutral; (2) heating activated lithium nickel manganese oxide obtained in the last step in a constant-temperature electric heating tank for 20-40 minutes at a heating temperature of 300-350 DEG C, thereby obtaining a lithium nickel manganese oxide substrate with elemental nickel on surface; (3) pouring the treated lithium nickel manganese oxide substrate with elemental nickel on surface into a chemical plating solution to obtain a mixture, magnetically stirring or ultrasonically dispersing the mixture for 20-60 minutes, then performing suction filtration, washing and vacuum-drying to obtain a nickel-coated lithium nickel manganese oxide material. The surface modifying method disclosed by the invention is used for uniformly coating and modifying the surface of the lithium nickel manganese oxide material through ultrasonic chemical nickel-coating; meanwhile, the nickel coating is an excellent conductor, so that the electrical conductivity of the material can be greatly increased after coating, and the material rate performance and the material cycle performance are improved in a facilitated manner.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials for chemical power sources, and in particular relates to a surface coating modification method for lithium nickel manganese oxide cathode materials. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices and other high-energy devices due to their low self-discharge rate, high specific energy, and no memory effect. Spinel LiNi 0.5 mn 1.5 o 4 The material is developed on the basis of lithium manganese oxide, with 4.7V (vs.Li / Li + ) high working voltage, the energy density is higher than that of LiCoO 2 and LiFePO 4 20% and 30% higher, the three-dimensional lithium ion diffusion channel in the spinel structure makes it exhibit excellent rate performance, and its battery cost is low, about 1 / 3 of the ternary material, these advantages make LiNi 0.5 mn 1.5 o 4 It has become the preferred cathode material for high specific...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62
CPCH01M4/36H01M4/505H01M4/525H01M4/62Y02E60/10
Inventor 郅晓科王丽陈丹刘贵娟梁广川
Owner HEBEI UNIV OF TECH
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