High-performance lithium nickel cobalt aluminum oxide positive material and preparation method thereof

A technology of nickel cobalt lithium aluminate and cathode material, applied in chemical instruments and methods, battery electrodes, nickel compounds, etc., can solve problems such as failure to improve cycle, failure to completely solve the basic problem of grain boundaries between primary particles, etc. Improve cycle performance, good surface reactivity, good sphericity

Inactive Publication Date: 2019-06-07
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some previous methods of surface treatment and morphology control can not completely solve the basic problems related to the grain boundary between primary particles, and cannot achieve the possibility of improving the cycle.

Method used

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  • High-performance lithium nickel cobalt aluminum oxide positive material and preparation method thereof
  • High-performance lithium nickel cobalt aluminum oxide positive material and preparation method thereof
  • High-performance lithium nickel cobalt aluminum oxide positive material and preparation method thereof

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preparation example Construction

[0033] The preparation method of the high-performance nickel-cobalt lithium aluminate cathode material of the present invention comprises the following steps:

[0034] 1) According to the chemical formula Ni 1-x-y co x al y o 2 The stoichiometric ratio of (0

[0035] 2) Prepare precipitant solution II;

[0036]3) Add deionized water and ammonia water to the reaction kettle to make the pH value in the reaction kettle between 10.5 and 11.0, then disperse polystyrene microspheres PSt into the reaction vessel, add trimethylhexadecyl bromide Ammonium is used as a surfactant; then use a metering pump to pump in solutions I, II and complexing agent solutions, and under stirring, control the reaction temperature at 50°C to 80°C and the pH value at 10.5 to 12.5. After the pH of the reaction system is stable, continue React for 6-12 hours, use polystyrene microspheres PSt as seeds,...

Embodiment 1

[0053] 1) Weigh 100g of nickel chloride, 18.76g of cobalt chloride, and 3.51g of aluminum chloride according to the molar ratio Ni / Co / Al=80:15:5, and dissolve the nickel chloride, cobalt chloride, and aluminum chloride Prepare a 2mol / L mixed solution in deionized water;

[0054] 2) Take a crystallized beaker and add 1.75m styrene, 0.2g divinylbenzene and 40mg azobisisobutyronitrile, mix well, then add the pre-configured dispersion medium (3% polyvinyl alcohol solution by volume ), ultrasound for 20min. Then transfer the uniformly mixed emulsion to a three-necked flask, place it on a constant temperature water bath, and stir continuously at a speed of 200r / min at 2°C for 1h, then raise the temperature to 80°C, and react for 2h; Separation with a centrifuge, repeated washing with deionized water and 95% ethanol, and finally drying the washed PSt microspheres in a vacuum oven at 60°C for 12 hours, D 50 = 100 nm polystyrene microspheres.

[0055] 3) The prepared D 50 =100nm 0....

Embodiment 2

[0058] 1) Weigh 150g of nickel sulfate, 28.76g of cobalt sulfate, and 3.51g of aluminum sulfate according to the molar ratio Ni / Co / Al=88:9:3, and dissolve nickel sulfate, cobalt sulfate, and aluminum sulfate in deionized water to prepare 2.3mol / L mixed solution;

[0059] 2) Take a crystallized beaker and add 1.75m styrene, 0.2g divinylbenzene and 40mg azobisisobutyronitrile, mix well, then add the pre-configured dispersion medium (3% polyvinyl alcohol solution by volume ), ultrasound for 20min. Then transfer the uniformly mixed emulsion to a three-necked flask, place it on a constant temperature water bath, and stir continuously at a speed of 200r / min at 2°C for 1h, then raise the temperature to 80°C, and react for 2h; Separation with a centrifuge, repeated washing with deionized water and 95% ethanol, and finally drying the washed PSt microspheres in a vacuum oven at 60°C for 12 hours, D 50 =150nm polystyrene microspheres.

[0060] 3) The prepared D 50 =150nm 0.5g of poly...

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Abstract

The invention discloses a high-performance lithium nickel cobalt aluminum oxide positive material and a preparation method thereof. Polystyrene microspheres can be adopted as a self-sacrificing template; and the high-performance lithium nickel cobalt aluminum oxide positive material can be prepared through high temperature oxygen calcination after uniform precipitation by combining a co-precipitation method. The prepared material is good in volume stability, and can effectively inhibit the generation and deteriorating evolution of a microfracture between primary particles even under high voltage and a high temperature of 60 DEG C; and as multiple gaps exist in secondary particles of the material, volume changes generated during the deintercalation of lithium of the primary particles can beeffectively dealt with, and the high temperature cycling performance of the material can be enhanced.

Description

technical field [0001] The invention relates to a battery electrode material, in particular to a high-performance nickel-cobalt-lithium-aluminate cathode material and a preparation method thereof. Background technique [0002] High-nickel materials are considered to be the most promising cathode materials for lithium batteries in the next generation due to their high capacity, low cost and environmental protection. Especially in the high voltage range (>4.3V), compared to commercial materials (such as LiCoO 2 ) is more stable. However, there are still some problems to be solved in the process of commercialization of high-nickel materials. [0003] With the increase of charge and discharge times, the existence of side reactions such as electrolyte decomposition and crystal structure transition from layered to rock-salt structure lead to serious degradation of battery performance. The instability of the material structure originates from the mixed cation layer, where div...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M10/0525C01G53/00
CPCY02E60/10
Inventor 唐淼徐宁吕菲马倩倩
Owner TIANJIN B&M SCI & TECH
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