Monocrystalline nickel-cobalt-lithium manganate cathode material and preparation method and applications thereof

A technology of nickel-cobalt-lithium-manganese-manganate and positive-electrode materials, which is applied in the field of single-crystal nickel-cobalt-lithium-manganese-manganese positive-electrode materials and its preparation, can solve problems such as increased processing difficulty, increased side reactions, and easy breakage, so as to improve safety performance and Cycle stability, increase cycle stability, and avoid structural defects
CN108306014AActive Publication Date: 2018-07-20SHENZHEN DYNANONIC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHENZHEN DYNANONIC
Publication Date
2018-07-20

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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.
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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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