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High-cycle nickel-cobalt-manganese ternary material and preparation method thereof

A ternary material, nickel-cobalt-manganese technology, used in electrical components, electrochemical generators, battery electrodes, etc., can solve problems such as poor compatibility and poor cycle performance, achieve good compatibility, improve rate performance, reduce side effects

Inactive Publication Date: 2017-06-13
江苏元景锂粉工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the disadvantages of poor cycle performance caused by poor compatibility between ternary materials and electrolytes at present, the purpose of the present invention is to improve the compatibility, cycle performance and rate performance of ternary materials and electrolytes through material surface coating, and Applied to lithium ion battery

Method used

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  • High-cycle nickel-cobalt-manganese ternary material and preparation method thereof
  • High-cycle nickel-cobalt-manganese ternary material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) First, weigh 15g of trimeric amine pyrophosphate and 3g of sodium dodecylbenzenesulfonate, add it to 500g of N-methylpyrrolidone, stir well to obtain a nitrogen-phosphorus mixture (referred to as solution A);

[0019] At the same time, weigh 3g of ethylene carbonate, add 1g of phenyllithium into 500g of N-methylpyrrolidone, and stir evenly to obtain a ethylene carbonate composite solution (referred to as B solution);

[0020] 2) After adding 120g LiNi 6 co 2 m 2 o 2 Add the ternary material to solution A, stir evenly, filter, and wash the obtained powder material into a tube furnace, and increase the temperature to 300°C at a heating rate of 8°C / min, and keep it warm for 2 hours, then naturally Cool down to room temperature to obtain a ternary composite material C doped with nitrogen and phosphorus in the cladding layer;

[0021] 3) After that, the composite material C was added to the solution B at a dew point of -40°C, stirred evenly, washed and filtered, and d...

Embodiment 2

[0023] 1) First weigh 10g of ammonium polyphosphate and 1g of sodium dodecylbenzenesulfonate, add them to 500g of N-methylpyrrolidone, stir well to obtain a nitrogen-phosphorus mixture (referred to as solution A);

[0024] At the same time, weigh 1g of ethylene carbonate, add 0.5g of n-butyllithium to 500g of N-methylpyrrolidone, and stir evenly to obtain a ethylene carbonate composite solution (referred to as B solution);

[0025] 2) After adding 100gLiNi 0.8 co 0.15 al 0.05 o 2 Add the ternary material to solution A, stir evenly, filter and wash the obtained powder material into a tube furnace, and increase the temperature to 200°C at a heating rate of 5°C / min, and keep it warm for 3 hours, then naturally Cool down to room temperature to obtain a ternary composite material C doped with nitrogen and phosphorus in the cladding layer;

[0026] 3) Afterwards, composite material C was added to solution B, stirred evenly, washed and filtered, and dried in a vacuum drying envir...

Embodiment 3

[0028] 1) First weigh 20g of melamine and 5g of sodium dodecylbenzene sulfonate, add them to 500g of N-methylpyrrolidone, and stir evenly to obtain a nitrogen-phosphorus mixture (referred to as solution A);

[0029] At the same time, 5g of ethylene carbonate was weighed, 2g of phenyllithium compound was added to 500g of N-methylpyrrolidone, and stirred evenly to obtain a ethylene carbonate composite solution (referred to as B solution);

[0030] 2) After that 150g120g LiNi 8 co 1 m 1 o 2 Add the ternary material to solution A, stir evenly, filter, and wash the obtained powder material into a tube furnace, and increase the temperature to 500°C at a heating rate of 10°C / min, and keep it warm for 1h, then naturally Cool down to room temperature to obtain a ternary composite material C doped with nitrogen and phosphorus in the cladding layer;

[0031] 3) Afterwards, composite material C was added to solution B, stirred evenly, washed and filtered, and dried in a vacuum drying ...

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Abstract

The invention belongs to the field of preparation of lithium-ion battery materials and particularly relates to high-cycle nickel-cobalt-manganese ternary material and a preparation method thereof; the high-cycle nickel-cobalt-manganese ternary material is mainly characterized in that the cycle performance of the material is improved by coating nickel-cobalt-manganese ternary material with a layer of nitrogen-phosphorus-containing compound to improve the compatibility of the material with electrolyte. The preparation method comprises: adding a nitrogen-phosphorus-containing polymer and a binder to 1-methyl-2-pyrrolidinone, stirring well, adding ternary material, stirring well, carbonizing, and soaking in ethylene carbonate solution to obtain the nickel-cobalt-manganese ternary material with nitrogen-phosphorus coating. The material prepared herein has surface charge distribution that is improved by means of nitrogen doping in the nitrogen-phosphorus compound, electron transfer performance is improved, quasi-Faraday effect is achieved, and capacity is given to better play; in addition, lattice structural stability of the material and the compatibility of the material with electrolyte are improved by the aid of phosphorus doping; the ethylene carbonate adsorbed by the material can provide improved compatibility of the material with electrolyte, the synergy of the doped nitrogen-phosphorus and the ethylene carbonate can be given to play, and the cycle performance of the material is improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery material preparation, in particular to a high-cycle nickel-cobalt-manganese ternary material and a preparation method thereof. Background technique [0002] Lithium-ion battery cathode ternary materials have the advantages of low cost, simple synthesis process, and high energy density. They are considered to be one of the most attractive cathode materials and have been successfully applied to electric vehicles. Mixed discharge of Ni / Li ions occurs, and the residual Li on the surface of the material easily interacts with CO in the air 2 and H 2 O reacts to form Li 2 CO 3 and LiOH, and the material is susceptible to electrolyte decomposition and side reactions during charge and discharge, which lead to a decrease in the cycle performance of the material. In order to improve the cycle stability of cathode materials, it is necessary to improve the interface relationship between the electrode and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/583H01M4/62H01M4/60H01M10/0525
CPCH01M4/36H01M4/525H01M4/583H01M4/60H01M4/625H01M10/0525Y02E60/10
Inventor 黄国林
Owner 江苏元景锂粉工业有限公司
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