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A kind of cathode material for high-capacity lithium secondary battery and preparation method thereof

A lithium secondary battery and cathode material technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of precursor and ternary cathode material design, the impact of equipment and product quality, and the difficulty of industrialized production. Low environmental moisture requirements, cost saving, and long-term high-temperature cycle effects

Active Publication Date: 2020-06-12
WUXI INSPECTION TESTING & CERTIFICATION INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned production of high-nickel products not only has long steps and high energy consumption, but also is difficult to realize industrialized production, and the reaction process is difficult to control
Chinese Patent Announcement No. CN 106410118 A provides a preparation of a 622-type lithium battery cathode material nickel cobalt lithium manganese oxide, which does not design the particle size distribution and doping elements of the precursor and the ternary cathode material, nor does it The gas in the synthesis process is regulated, but the regulation of each process has a huge impact on equipment and product quality

Method used

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  • A kind of cathode material for high-capacity lithium secondary battery and preparation method thereof
  • A kind of cathode material for high-capacity lithium secondary battery and preparation method thereof
  • A kind of cathode material for high-capacity lithium secondary battery and preparation method thereof

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Effect test

Embodiment 1

[0041] (1) mixing: mix D 50 4.0µm and D 50 14.0μm nickel cobalt manganese hydroxide precursor Ni 0.6 co 0.2 mn 0.2 (OH) 2 Accurately weigh and add high-speed mixer according to the mass ratio of 3:7, and accurately weigh lithium carbonate according to lithium metal ratio (Li / Me=1.05) simultaneously, according to B, W, Al being 500ppm respectively, F being the amount of 1055ppm at high speed Add AlF to the mixer at the same time 3 , Na 2 B 4 o 7 10H 2 O, WO 3 , mixed for 30min;

[0042] (2) Firing: The mixed powder prepared in step 1 is accurately loaded into the crucible according to the set weight of 4.5kg and entered into a 40m roller kiln with 2m / area. The kiln uses a single-layer four-row crucible with a size of 320mm*320mm*100mm. The temperature is raised to 120°C at a rate of 2.5°C / min, and the temperature is kept at 120°C for 3 hours. After that, the temperature is continued to rise at a rate of 2.5°C / min. Insulate at 500°C for 3 hours, then raise the temper...

Embodiment 2

[0046] (1) mixing: mix D 50 3.0μm and D 50 12.0μm nickel cobalt manganese hydroxide precursor Ni 0.7 co 0.15 mn 0.15 (OH) 2 Accurately weigh and add to the high-speed mixer according to the mass ratio of 2:8, and simultaneously accurately weigh lithium carbonate according to the lithium metal ratio (Li / Me=1.04), according to B, W, Al being 1000ppm respectively, and F being 2110ppm at high speed Add AlF to the mixer at the same time 3 , Na 2 B 4 o 7 10H 2 O, WO 3 , mixed for 30min;

[0047] (2) Firing: The mixed powder prepared in step 1 is accurately loaded into the crucible according to the set weight of 4.0kg and entered into a 40m roller kiln with 2m / area. The kiln uses a single-layer four-row crucible with a size of 320mm*320mm*100mm. The temperature is raised to 120°C at a rate of 2.0°C / min, and the temperature is kept at 120°C for 3 hours. After that, the temperature is continued to rise at a rate of 2°C / min. Insulate at 500°C for 4 hours, then raise the temp...

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Abstract

The invention relates to a positive electrode material for a high-capacity lithium secondary battery and a preparation method thereof, belonging to the technical field of preparation of the positive electrode material of the lithium ion battery. The preparation method comprises the steps of precisely weighing two nickel-cobalt-manganese hydroxide precursors according to a certain mass ratio and adding the two nickel-cobalt-manganese hydroxide precursors into a high-speed mixer, and precisely weighing a lithium source according to a lithium metal ratio, adding additives to the high-speed mixer,and mixing uniformly; loading prepared mixed powder into a crucible and entering a roller kiln; burning in a three-stage insulation manner; and discharging from a furnace, then roughly crushing, finecrushing, sieving, removing iron, and packaging to obtain a positive electrode active substance with a general formula of LiNi<x>Co<y>Mn<z>MO<2>. In the method, a mixed gas of oxygen and air isused, the oxygen concentration is adjusted according to different burning stages, and the product is burned for once, so that the cost is saved remarkably; further, the used lithium source is lithiumcarbonate, so that corrosion and harm of lithium hydroxide to devices and people are reduced; and the method has relatively low requirement on environment and moisture, is easy to operate, and is suitable for large-scale production. Due to use of a doping technology, the positive electrode material is improved in high-temperature performance effectively, can undergo high-temperature cycling for along time and has high high-temperature storage performance.

Description

technical field [0001] The invention relates to a positive electrode material for a high-capacity lithium secondary battery and a preparation method thereof, belonging to the technical field of preparation of positive electrode materials for lithium ion batteries. Background technique [0002] For lithium-ion batteries, the cathode material is a key factor in determining its cycle performance and safety performance, accounting for about 40% of the total cost of lithium batteries. The lithium ions contained in the positive electrode material not only need to be repeatedly deintercalated to form a current during charge and discharge, but also need to form an SEI (Solid Electrolyte Inter-phase) film on the surface of the negative electrode material. Therefore, the positive electrode material in the lithium-ion battery system is a key factor restricting its development. [0003] At present, the main cathode materials are as follows: LiCoO 2 , LiMn 2 o 4 , LiNi 1-x-y co x m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/362H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 陈作王胡长春季建明
Owner WUXI INSPECTION TESTING & CERTIFICATION INST
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