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Positive electrode material, and preparation method thereof and lithium ion battery

A technology of positive electrode materials and coating materials, applied in the field of battery materials, can solve problems such as requiring large distances, low energy density, and no room for improvement

Pending Publication Date: 2021-05-18
SHENZHEN CITY BATTERY NANOMETER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although lithium iron phosphate has the advantages of high safety and long cycle life, its energy density is low, its theoretical capacity is 170mAh / g, and its discharge voltage is 3.2V. There is basically no room for improvement to meet the increasingly high endurance requirements of vehicles. power battery
Although the mixed system of ternary and spinel lithium manganese oxide has high energy density, it still has a long way to go from the requirements of actual electric vehicles for batteries.
[0011] However, the above methods all have the problem that the capacity and cycle performance need to be further improved.

Method used

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  • Positive electrode material, and preparation method thereof and lithium ion battery
  • Positive electrode material, and preparation method thereof and lithium ion battery
  • Positive electrode material, and preparation method thereof and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] In this embodiment, the positive electrode material is prepared according to the following method:

[0085] (1) The commercial precursor (Ni 0.92 co 0.06 Al 0.02 (OH) 2 ) and LiOH are placed in a mixer according to accurate stoichiometric weighing and mixed for 40 minutes, and the water temperature is controlled at 30°C;

[0086] Wherein, the dehydration pretreatment is to pretreat the commercial precursor at 500° C. for 8 hours in an air atmosphere;

[0087] (2) After mixing evenly, take it out after heat treatment at 740°C for 15 hours, and pulverize to obtain LiNi 0.92 co 0.06 Al 0.02 o 2 The matrix material is crushed to control the particle size to the required target value, and the final matrix material is sealed and sealed for use;

[0088] (3) Al 2 o 3 , CoO and MnO 2 Dissolve in dilute nitric acid solution according to the element ratio of Al, Co and Mn of 1:1:1, dilute with deionized water, titrate with 50% ammonia water until the pH is about 7, sto...

Embodiment 2

[0094] In this embodiment, the positive electrode material is prepared according to the following method:

[0095] (1) Dehydrated and pretreated Li 0.98 Ni 0.93 co 0.02 Al 0.05 (OH) 2 Mix with LiOH in a mixer for 1 hour according to accurate stoichiometric weighing, and control the water temperature at 25°C;

[0096] Wherein, the dehydration pretreatment is to pretreat the commercial precursor at 400°C for 10h under an oxygen atmosphere;

[0097] (2) After mixing evenly, it was calcined at 700°C for 20 hours in an oxygen atmosphere, taken out, and crushed to obtain Li 0.98 Ni 0.93 co 0.02 Al 0.05 o 2 Base material, sealing and sealing the obtained base material for later use;

[0098] (3) AlCl 3 、Co(OH) 3 and MnO 2 Dissolve in dilute nitric acid solution according to the element ratio of Al, Co and Mn of 1:1:1, dilute with deionized water, titrate with 30% ammonia water until the pH is about 4, stop adding, let stand for 10h and then filter , the water temperatur...

Embodiment 3

[0103] In this embodiment, the positive electrode material is prepared according to the following method:

[0104] (1) Dehydrated and pretreated Li 1.03 Ni 0.88 co 0.08 mn 0.04 (OH) 2 Mix with LiOH in a mixer for 0.4h according to accurate stoichiometric weighing, and control the water temperature at 40°C;

[0105] Wherein, the dehydration pretreatment is to pretreat the commercial precursor at 600° C. for 5 hours under an oxygen atmosphere;

[0106] (2) After mixing evenly, calcined at 780°C for 6 hours in an oxygen atmosphere, took it out, and pulverized it to obtain Li 1.03 Ni 0.88 co 0.08 mn 0.04 o 2 Base material, sealing and sealing the obtained base material for later use;

[0107] (3) Al(OH) 3 , CoO and MnO 2 Dissolve in dilute nitric acid solution according to the element ratio of Al, Co and Mn of 1:1:1, dilute with deionized water, titrate with 50% ammonia water until the pH is about 11, stop adding, let stand for 20h and then filter , the temperature of...

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Abstract

The invention provides a positive electrode material, and a preparation method thereof and a lithium ion battery. The positive electrode material comprises a substrate and a coating layer coating the substrate, the substrate is a high-nickel ternary material, and the coating layer is a composite oxide coating layer containing Al, Co and Mn. The preparation method comprises the following steps: 1) mixing a matrix precursor with a lithium source, and calcining to obtain a matrix material; (2) mixing an aluminum source, a cobalt source and a manganese source in a dissolving agent, adding a coprecipitator, standing for reaction, and then carrying out solid-liquid separation to obtain a coating material; and 3) mixing the base material and the coating material, and performing heat treatment to obtain the positive electrode material. The positive electrode material provided by the invention can well solve the safety problem and the cycle stability problem of a high-nickel ternary material, reduces the residual alkali amount on the surface of the positive electrode material, and has the advantages of low residual alkali, low mixing degree, high conductivity, high capacity, high cycle efficiency and the like.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and relates to a positive electrode material, a preparation method thereof and a lithium ion battery. Background technique [0002] Accompanied by the high-intensity consumption of traditional fossil energy and the continuous rise in prices. The development and utilization of new energy sources are getting more and more attention from the government. At present, the development of new energy vehicles has become one of the important national strategies, and it is imminent to accelerate technology research and development and industrialization. The main bottleneck in the development of new energy vehicles is the power battery. As the mainstream development direction, lithium-ion power batteries still face many challenges in order to meet the requirements of electric vehicles for power batteries, including: cost, safety, energy density and cycle life. One of the keys to solving the abov...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/46H01M4/485H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/366H01M4/5825H01M4/505H01M4/525H01M4/485H01M4/38H01M4/463H01M10/0525Y02E60/10
Inventor 毛洪仁杨顺毅罗亮黄友元杨才德江庆东
Owner SHENZHEN CITY BATTERY NANOMETER TECH
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