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Nano-sheet lithium-rich cathode material and preparation method and application thereof

A lithium-rich cathode material and nanosheet technology, applied in the field of materials, can solve the problems of low coulombic efficiency, low first-cycle charge and discharge capacity, poor cycle performance, etc., and achieve shortened lithium ion transmission channels and novel morphology and structure. , good controllability

Inactive Publication Date: 2018-07-17
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the technical problems of low first cycle charge and discharge capacity, low coulombic efficiency and poor cycle performance of lithium-ion batteries caused by lithium-rich cathode materials in the prior art

Method used

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  • Nano-sheet lithium-rich cathode material and preparation method and application thereof
  • Nano-sheet lithium-rich cathode material and preparation method and application thereof
  • Nano-sheet lithium-rich cathode material and preparation method and application thereof

Examples

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Embodiment 1

[0043] Example 1: Preparation of Nanosheet Lithium-rich Cathode Material

[0044] NiSO 4 ·6H 2 O. CoSO 4 ·7H 2 O and MnSO 4 ·H 2 O was dissolved in deionized water at a stoichiometric ratio of 1:1:4 to prepare a 2mol / L mixed metal ion sulfate solution A; NaOH was dissolved in deionized water to prepare a 4mol / L solution B; Dissolve in deionized water and prepare 0.5mol / L solution C; add solutions A, B and C to the co-precipitation reactor at the same time with a peristaltic pump under an inert gas environment, at a pH of 10.8 and a temperature of 60°C , stirred at 500rpm for 10 hours; the solid product obtained after stirring was centrifugally cleaned 5 times with deionized water, and then vacuum-dried to obtain the hydroxide precursor D; the precursor D was mixed with Li 2 CO 3 Mix evenly and place in a corundum boat for calcination. First, pre-calcine at 500°C for 5h, then calcinate at 850°C for 15h. The heating rate is 2°C / min, thereby preparing a lithium-rich cathode ...

Embodiment 2

[0045] Example 2: Preparation of Nanosheet Lithium-rich Cathode Material

[0046] NiSO 4 ·6H 2 O. CoSO 4 ·7H 2 O and MnSO 4 ·H 2 O was dissolved in deionized water at a stoichiometric ratio of 1:1:4 to prepare a 2mol / L mixed metal ion sulfate solution A; NaOH was dissolved in deionized water to prepare a 4mol / L solution B; Dissolve in deionized water and prepare 0.5mol / L solution C; add solutions A, B and C to the co-precipitation reactor at the same time with a peristaltic pump under an inert gas environment, at a pH of 11 and a temperature of 50°C , and stirred at 400rpm for 8 hours; the solid product obtained after stirring was centrifugally cleaned 5 times with deionized water, and then vacuum-dried to obtain the hydroxide precursor D; the precursor D was mixed with Li 2 CO 3 Mix evenly, and place in a corundum boat for calcination treatment. First, pre-calcine at 400°C for 6h, and then calcinate at 900°C for 12h. The heating rate is 2°C / min, thereby preparing the n...

Embodiment 3

[0047] Example 3: Preparation of Nanosheet Lithium-rich Cathode Material

[0048] NiSO 4 ·6H 2 O. CoSO 4 ·7H 2 O and MnSO 4 ·H 2 O was dissolved in deionized water at a stoichiometric ratio of 1:1:4 to prepare a 2mol / L mixed metal ion sulfate solution A; NaOH was dissolved in deionized water to prepare a 4mol / L solution B; Dissolve in deionized water and prepare 0.5mol / L solution C; Add solutions A, B and C to the co-precipitation reactor at the same time with a peristaltic pump under an inert gas environment, at a pH of 10.5 and a temperature of 70°C , and stirred at 1000rpm for 12 hours; the solid product obtained after stirring was centrifugally cleaned 5 times with deionized water, and then vacuum-dried to obtain the hydroxide precursor D; the precursor D was mixed with Li 2 CO 3 Mixed evenly, and placed in a corundum boat for calcination treatment, first pre-calcined at 600°C for 4h, then calcined at 800°C for 18h, with a heating rate of 2°C / min, thereby preparing ...

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Abstract

The invention provides a nano-sheet lithium-rich cathode material and a preparation method and application of the nano-sheet lithium-rich cathode material. The nao-sheet lithium-rich cathode materialis prepared by combining a coprecipitation method and a solid-phase sintering method, and a used precipitate is hydroxide; the modified nanosheet lithium-rich cathode material of which the surface iscoated with metal oxides is obtained by coating transition metal oxides on the surface of the nanosheet lithium-rich cathode material by a hydrothermal method and a heat treatment method. The nano-sheet lithium-rich cathode material disclosed by the invention has small particle sizes, shortens a lithium-ion transmission channel and realizes rapid charge and discharge. The modified nano-sheet lithium-rich cathode material of which the surface is coated with the metal oxides provided by the invention has the advantages of good first-ring charge-discharge capacity, coulomb efficiency and cycle stability, excellent lithium storage performance and the like for a lithium-ion battery, and further is simple and practical in preparation method, low in cost and very good in application prospects.

Description

technical field [0001] The invention relates to the field of materials, and the invention provides a nanosheet lithium-rich cathode material, a preparation method and an application thereof. Background technique [0002] With the rapid development of the global economy, the continuous consumption of fossil energy and other non-renewable energy, air pollution and global warming and other environmental problems are becoming more and more serious, making people's demand for efficient, clean and sustainable energy increasing. However, renewable energy must be efficiently utilized with the help of efficient energy conversion and storage technologies. Lithium-ion batteries have received extensive attention and become a research hotspot in recent years due to their outstanding advantages such as high operating voltage, high energy density, long charge and discharge life, small self-discharge, no memory effect, and environmental friendliness. At present, lithium-ion batteries have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/58H01M4/136H01M4/1397H01M10/0525
CPCH01M4/136H01M4/1397H01M4/485H01M4/505H01M4/5825H01M10/0525Y02E60/10
Inventor 胡先罗辛月
Owner HUAZHONG UNIV OF SCI & TECH
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