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A kind of single crystal nickel cobalt lithium manganate positive electrode material and its preparation method and application

A technology of nickel-cobalt lithium manganese oxide and positive electrode materials, which is applied to battery electrodes, structural parts, electrical components, etc., and can solve the problems of battery capacity attenuation, damage to the interface structure, and increased side reactions.

Active Publication Date: 2020-10-20
SHENZHEN DYNANONIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the preparation method of NCM is mostly secondary spherical particles formed by primary grains, that is, nickel source, cobalt source, and manganese source are co-precipitated to prepare the precursor, and then mixed with lithium source, which will be prepared through multiple steps of sintering process in the later stage. There are many internal gaps and obvious structural defects, and the unit pole piece is prone to breakage during the rolling process, resulting in attenuation of battery capacity in the later stage, and the compaction density is greatly limited. At the same time, it also increases the difficulty of processing and limits the improvement of energy density; secondly, The theoretical cycle life of the battery prepared by NCM can reach 1500-2000 times, but due to the large internal pores, it is difficult to cover, and the active material material is in contact with the electrolyte, and will be corroded by HF under high temperature conditions, destroying the interface structure, and causing transition metal The dissolution of Ni, Co, and Mn in the electrolyte, the contact with the electrolyte will lead to an increase in side reactions, a large amount of gas will be generated, the air pressure of the cell will increase, and the battery will expand, causing serious safety hazards
Therefore, there is an urgent need for a new NCM preparation method to overcome the existing shortcomings of NCM, thereby eliminating the safety hazards of NCM in battery applications

Method used

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  • A kind of single crystal nickel cobalt lithium manganate positive electrode material and its preparation method and application
  • A kind of single crystal nickel cobalt lithium manganate positive electrode material and its preparation method and application
  • A kind of single crystal nickel cobalt lithium manganate positive electrode material and its preparation method and application

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preparation example Construction

[0033] see figure 1 , a method for preparing a single crystal nickel cobalt lithium manganese oxide positive electrode material provided for the implementation of the present invention, comprising:

[0034] Step S101: Mix the lithium source, the nickel source, the cobalt source, the manganese source, and the doping element source uniformly according to the stoichiometric ratio to form a mixed solution.

[0035] In an embodiment of the present invention, the lithium source includes one or more combinations of lithium carbonate, lithium hydroxide, lithium acetate, lithium nitrate, and lithium sulfate, and the nickel source includes nickel sulfate, nickel nitrate, and nickel acetate. , the combination of one or more in nickel chloride, described cobalt source comprises the combination of one or more in cobalt sulfate, cobalt nitrate, cobalt acetate, cobalt chloride, and described manganese source comprises manganese sulfate, nitric acid A combination of one or more of manganese,...

Embodiment 1

[0058]Lithium nitrate, nickel nitrate, cobalt nitrate, and manganese nitrate are formulated into a solution, and the molar ratio is 1.08:0.5:0.2:0.3, and they are mixed evenly, and the raw materials are fully mixed by spray drying at 200°C to obtain a solid powder, and then The solid powder is mixed with the flux NaCl by ball milling to obtain a mixture, wherein the mass proportion of the flux NaCl in the mixture is 5%. Under the air atmosphere, heat the mixture at 500°C / h to 600°C for 4h, continue to heat up at 500°C / h to 850°C for 10h, cool to room temperature, wash and dry, and pass through a 400-mesh sieve to obtain single crystal nickel Lithium cobalt manganese oxide cathode material, its chemical formula is LiNi 0.5 co 0.2 mn 0.3 o 2 . The prepared single crystal nickel cobalt lithium manganese oxide positive electrode material was subjected to scanning electron microscopy, and the results were as follows figure 2 As shown, it shows that the prepared single crystal...

Embodiment 2

[0060] Lithium acetate, nickel acetate, cobalt acetate, and manganese acetate are made into a solution, and the molar ratio is 1.12:0.6:0.2:0.2, and they are mixed evenly, and the raw materials are fully mixed by spray drying at 400°C to obtain a solid powder, and then The solid powder is ball milled and mixed with flux LiCl to obtain a mixture. Under the air atmosphere, heat the mixture from 600°C / h to 400°C for 5 hours, continue to heat up to 950°C at 500°C / h and sinter for 18 hours, cool to room temperature, wash and dry, and pass through a 400-mesh screen to obtain single crystal nickel Lithium cobalt manganese oxide cathode material, its chemical formula is LiNi 0.6 co 0.2 mn 0.2 o 2 . The prepared single crystal nickel cobalt lithium manganese oxide positive electrode material was subjected to scanning electron microscopy, and the results were as follows image 3 As shown, it shows that the prepared single crystal nickel cobalt lithium manganese oxide positive elect...

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Abstract

The invention provides a monocrystalline nickel-cobalt-lithium manganate cathode material. The chemical formula of the cathode material is Li<z>Ni<x>Co<y>Mn<1-x-y>MO2, wherein 1<=z<=1.05, 0<x<0.8,0<y<0.4, 0<x+y<1, 0<=a<0.1, and M represents a doping element and is one or more of magnesium, aluminum, zinc, titanium, zirconium, niobium, chromium, and rare earth elements. The size of the monocrystalline nickel-cobalt-lithium manganate cathode material is uniform and is in a micrometer level. The compaction density can reach 3.8-3.9 g / cm3. The circulation stability is improved, when the cathode material is used in a battery. The invention also provides a preparation method of the monocrystalline nickel-cobalt-lithium manganate cathode material. The cathode material is prepared by spray drying and a one-time sintering technology, the internal gaps of the cathode material are reduced, the structural defect is avoided, and the service life and safety of the cathode material are both improved.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a single crystal nickel cobalt lithium manganese oxide positive electrode material and a preparation method and application thereof. Background technique [0002] With the rapid development of the economy and the gradual improvement of people's awareness of environmental protection, people urgently need to find a new energy source to replace the traditional fossil energy. Discharge level, no memory effect, no pollution of heavy metal elements such as lead and cadmium, long cycle life and other advantages, become an ideal choice. Currently commercially available cathode materials for lithium-ion batteries include lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, and lithium nickel cobalt manganese oxide (NCM), etc. NCM is favored by the market due to its higher gram capacity and better safety. [0003] At present, the preparation method of NCM is mostly secon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 孔令涌钟泽钦王俪颖
Owner SHENZHEN DYNANONIC
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