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Preparation method of nano-layered lithium nickel cobalt manganate

A nickel-cobalt lithium manganese oxide, nano-layered technology, applied in the field of lithium-ion battery cathode material preparation, to achieve the effects of short production cycle, good crystal form, and high crystallinity

Active Publication Date: 2019-04-26
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a preparation method capable of large-scale industrial production of nano-layered nickel-cobalt-manganese lithium manganese oxide, so as to solve the large-scale industrial batch preparation of nano-scale nickel-cobalt-manganese with controllable chemical composition ratio in the background technology Lithium Oxide Problem

Method used

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  • Preparation method of nano-layered lithium nickel cobalt manganate
  • Preparation method of nano-layered lithium nickel cobalt manganate
  • Preparation method of nano-layered lithium nickel cobalt manganate

Examples

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Embodiment 1

[0041] A kind of nano-layered nickel-cobalt lithium manganese oxide (LiNi 0.5 co 0.2 mn 0.3 o 2 ) preparation method, comprising the following steps:

[0042] The first step is to prepare nanoscale Ni by low temperature co-precipitation method 0.5 co 0.2 mn 0.3 (OH) 2 Precursor, comprising the following preparation steps:

[0043] Take by weighing the nickel salt, cobalt salt, manganese salt that metal ion molar ratio is 5:3:2, and the antioxidant that takes by weighing 16g, it is dissolved in the distilled water (ice water) of 4L, is made into nickel, cobalt, manganese The total concentration of three metal ions is a mixed solution of 0.20mol / L; the solution is pumped into the supergravity reactor with a centrifugal pump, and the control switch for controlling the rotor of the supergravity reactor is opened, and the adjusting speed is 1200r / min, and the solution will Stay in the helical channel type rotating bed of the supergravity reactor and react under the effect o...

Embodiment 2

[0046] Embodiment 2 (comparative example 1)

[0047] With Example 1, the difference is that the reactor is a conventional common flask, carried out in a water bath of a magnetic stirrer, that is, the reaction is carried out under conventional gravity; The volumes of ammonia solution and sodium hydroxide solution added dropwise were 20 ml and 45 ml, respectively.

Embodiment 3

[0049] Same as Example 1, the difference is that the calcination temperature is 700°C.

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Abstract

The invention discloses a preparation method of nano-layered lithium nickel cobalt manganate. The method comprises the following steps: step 1, preparing a nano-scale Ni<x>Co<y>Mn<1-x-y>(OH)<2> precursor by low temperature coprecipitation, which specifically comprises the following steps: dissolving a proportional amount of nickel salt, cobalt salt and manganese salt and a certain amount of an antioxidant in low-temperature pure water and uniformly mixing; injecting the mixed solution into a super-gravity reactor, then dropwise adding an aqueous ammonia solution and a sodium hydroxide solutionsuccessively, performing a low-temperature coprecipitation reaction, taking out the solution and aging for a period of time without contact with oxygen after the reaction is completed, and then sequentially performing filtration, washing and drying to obtain the nano-scale precursor; step 2, preparing nano-scale Ni<x>Co<y>Mn<1-x-y>(OH)<2> with a solid phase method. The preparation method is simple in process and low in cost, real co-precipitation at low temperature can be achieved, the oxidation of manganese hydroxide is avoided after the addition of the antioxidant, the crystal form of a product is good, and the mass production is stable.

Description

technical field [0001] The invention relates to the technical field of preparation of positive electrode materials for lithium ion batteries, in particular to a preparation method of nano-layer nickel-cobalt lithium manganese oxide. Background technique [0002] The performance of lithium-ion batteries is mainly limited by the positive electrode material. A good positive electrode material determines the performance of lithium-ion batteries. Therefore, how to choose the positive electrode material of lithium-ion batteries is an important issue. Among the many positive electrode materials for lithium-ion batteries, such as lithium cobaltate, lithium manganate, lithium nickelate, and lithium iron phosphate, cobalt is expensive and toxic, resulting in high cost and great pollution to the environment. Lithium manganate is prone to disproportionation reaction and Jahn-Teller effect, resulting in instability; Lithium nickelate is prone to phase change during charging and dischargi...

Claims

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Application Information

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IPC IPC(8): C01G53/00B82Y40/00H01M4/505H01M4/525
CPCH01M4/505H01M4/525B82Y40/00C01G53/50C01P2002/20C01P2002/72C01P2002/88C01P2004/03C01P2004/62Y02E60/10
Inventor 周继承周念余柳丽
Owner XIANGTAN UNIV
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