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A kind of preparation method of nano-layer nickel cobalt lithium manganese oxide

A nano-layered technology of nickel-cobalt lithium manganese oxide, which is applied in the field of lithium-ion battery cathode material preparation, to achieve the effects of uniform particles, good crystal form, and good application prospects

Active Publication Date: 2022-05-13
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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  • A kind of preparation method of nano-layer nickel cobalt lithium manganese oxide
  • A kind of preparation method of nano-layer nickel cobalt lithium manganese oxide
  • A kind of preparation method of nano-layer nickel cobalt lithium manganese oxide

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

A preparation method of nano-layered nickel-cobalt lithium manganese oxide, comprising the following steps: the first step is to prepare nano-scale Ni by low-temperature co-precipitation x co y mn 1‑x‑y (OH) 2 Precursor, specifically: dissolving a proportional amount of nickel salt, cobalt salt, manganese salt and a certain amount of antioxidant in low-temperature pure water, and mixing evenly; injecting the mixed solution into a high gravity reactor, and then adding ammonia solution dropwise And sodium hydroxide solution, carry out low-temperature co-precipitation reaction, after the reaction is over, take out the solution and age it for a period of time under avoiding contact with oxygen, and then carry out filtering, washing and drying in sequence to obtain the precursor of nanometer level; the second step It is a solid phase method to prepare nano-sized LiNi x co y mn 1‑x‑y o 2 . The invention has the advantages of simple process, low cost, co-precipitation can be really achieved at low temperature, oxidation of manganese hydroxide is avoided after adding an antioxidant, the crystal form of the product is good, and 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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Patent Type & Authority Patents(China)
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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