High practicality lithium nickel manganese oxide and preparation method thereof

A practical technology of lithium nickel manganate, applied in the field of lithium ion power battery cathode materials, can solve the problems of material cycle performance not meeting commercialization requirements, surface coating agent doping, affecting battery preparation and other problems, achieving easy implementation, The effect of improving peel strength and suppressing side reactions

Inactive Publication Date: 2015-09-09
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current limiting factors for the promotion of this material to the market are: 1) The decomposition of the electrolyte under high voltage causes the cycle performance of the material to fail to meet commercial requirements;
[0003] 2) Lithium nickel manganese oxide materials obtained by many modification methods reported publicly at present, although the electrochemical performance of the material has been improved, but there are also problems such as poor processing performance, which seriously affects the preparation of full batteries
In this method, since the oxide as the surface coating agent is added together with the reaction raw materials, the surface coating agent is easily doped into the system and cannot be effectively coated. On the other hand, the used melting agent may decompose and bring The corresponding environmental pressure may cause residues in the system to introduce impurity phases to cause elution problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add the manganese dioxide, nickelous oxide, lithium carbonate and 1% stearic acid in the metering ratio into the mixer, and the ball milling media are zirconia balls with diameters of D20mm, D15mm, D10mm, and D5mm respectively, and the ratio of the balls is D20mm: D15mm: D10mm: D5mm=1:1:1:1, the ball-to-material ratio is 6:1, the speed is 100rpm, the material is mixed for 7 hours, and the material is pre-calcined at 300°C for 1 hour The corresponding precursors were prepared. The obtained precursor was calcined in a muffle furnace at a calcination temperature of 700°C to 1000°C, the number of calcination steps was 2 times, calcination at 700°C for 6 hours, and then calcination at 900°C for 6 hours, the cumulative calcination time was 12 hours, and the annealing temperature was 600°C, heat preservation for 15 hours, and natural cooling, the target lithium nickel manganese oxide can be obtained, and the specific surface area of ​​the material is 0.5m 2 / g. The material i...

Embodiment 2

[0027] Add trimanganese tetroxide, nickelous oxide, lithium hydroxide and 1% ammonium polyacrylate into the mixer, and the ball milling media are zirconia balls with diameters of D20mm, D15mm, D10mm, and D5mm respectively. The mass ratio is D20mm: D15mm: D10mm: D5mm=0.5:0.6:0.6:1, the ball-to-material ratio is 4:1, the mixture is mixed for 5 hours, the speed is 150rpm, and the material is calcined in the obtained precursor gas muffle furnace, The calcination process is 800°C for 2 hours, 850°C for 2 hours, 900°C for 10 hours, the annealing temperature is 650°C, and the temperature is kept for 20 hours, and the temperature is naturally lowered. Specific surface area Lithium nickel manganese oxide, the specific surface area of ​​the material is 0.3m 2 / g. The material is ground, dispersed, and sieved, and then placed in a chemical vapor deposition tube furnace for chemical vapor deposition reaction, and nitrogen carrier gas containing ethane (volume ratio of toluene 10%) is intr...

Embodiment 3

[0029] Add the manganese dioxide, nickelous oxide, lithium hydroxide and 3% stearic acid into the mixer, and the ball milling media are zirconia balls with diameters of D20mm, D15mm, D10mm, and D5mm respectively. The ratio is D20mm: D15mm: D10mm: D5mm=1:0.5:0.5:1, the ball-to-material ratio is 3:1, the rotation speed is 100rpm, and the mixture is mixed for 5 hours. The obtained precursor is pre-calcined at 400°C for 1 hour, and then The obtained precursor is calcined. The calcination process is 800°C for 2 hours, 850°C for 2 hours, 900°C for 2 hours, 950°C for 12 hours, annealing temperature of 700°C, heat preservation for 20 hours, and natural cooling to obtain The target is low specific surface area lithium nickel manganese oxide with a certain degree of cation disorder and structural dislocation, and the specific surface area of ​​the material is 0.35m 2 / g. The material is ground, dispersed, and sieved, and then placed in a chemical vapor deposition tube furnace for chemic...

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Abstract

The invention discloses a high practicality lithium nickel manganese oxide and a preparation method thereof. The lithium nickel manganese oxide is characterized in that manganese source, lithium source, nickel source and a certain amount of grinding aid are blended by a dry grinding mode, the lithium nickel manganese oxide material with low specific surface area is prepared by using the characteristics of slow crystal nucleation rate and little nucleation of a precursor, contact area of the material and an electrolyte is increased, cycle life of the material is increased; cation disorder degree and crystal structure dislocation of the crystal can be controlled through a multi-step calcining technology for guaranteeing the multiplying power performance of the material; the obtained lithium nickel manganese oxide coats the surface of a carbon layer by using a vapour deposition method, anchoring strength of the material and a current collector is enhanced, peeling intensity of pole sheet is enhanced, material processing property is ensured, and multiplying power performance is increased. The material has the advantages of long service life and good processing property, and is the lithium nickel manganese oxide material with high practicality, the preparation method is economic and easy to operate, and is suitable for commercialization popularization.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion power batteries, in particular to a lithium nickel manganese oxide material with long cycle life and good processability, and a method for preparing the material by combining a solid phase reaction method and a chemical vapor deposition method. Background technique [0002] A few days ago, with the vigorous promotion of lithium-ion battery electric vehicles, the market's requirements for corresponding lithium-ion batteries are also getting higher and higher. Different from the battery standards for consumer electronics such as mobile phones, the field of power batteries has higher requirements on the energy density and rate performance of materials. The voltage platform of lithium nickel manganese oxide as high as 4.7V and the three-dimensional lithium ion diffusion channel make it have nearly 30% higher energy density and better rate performance than the current markete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62
CPCH01M4/505H01M4/525H01M4/621H01M10/0525Y02E60/10
Inventor 彭文汪涛
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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