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Preparation of C-coated LiMn2O4 nanowire with high-temperature solid-state method

A technology of carbon-coated lithium manganate and high-temperature solid-phase method, which is applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems that violate the original intention of nanomaterial preparation, and achieve improved cycle stability High performance, improved lithium battery performance, and simple operation

Inactive Publication Date: 2017-05-17
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the high-temperature solid phase can provide sufficient crystallinity, which is conducive to improving the performance of lithium batteries. However, nanomaterials often agglomerate during the high-temperature solid-phase sintering process, and grow into micron materials for the second time, which violates the original intention of the preparation of nanomaterials.

Method used

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  • Preparation of C-coated LiMn2O4 nanowire with high-temperature solid-state method
  • Preparation of C-coated LiMn2O4 nanowire with high-temperature solid-state method
  • Preparation of C-coated LiMn2O4 nanowire with high-temperature solid-state method

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Embodiment 1

[0018] Step 1: Calcining 1 part of manganese sulfate and 15 parts of potassium nitrate at 380° C. in air for 3 hours to obtain a precursor of manganese oxide nanowires;

[0019] Step 2: Put 0.01g of glucose and 0.01g of precursor in a hydrothermal axe, react at 180°C for 2h, and coat the carbon layer on the surface of manganese oxide nanowires;

[0020] Step 3: 2.05 parts of carbon-coated manganese oxide nanowires and 1 part of lithium hydroxide were solid-phase sintered at 500° C. for 5 hours to obtain carbon-coated lithium manganate nanowires.

Embodiment 2

[0022] Step 1: Calcining 1 part of manganese sulfate and 15 parts of potassium nitrate at 380° C. in air for 3 hours to obtain a precursor of manganese oxide nanowires;

[0023] Step 2: Put 0.1g glucose and 0.1g precursor in a hydrothermal axe, react at 180°C for 2h, and coat the carbon layer on the surface of manganese oxide nanowires;

[0024] Step 3: 2.05 parts of carbon-coated manganese oxide nanowires and 1 part of lithium hydroxide were solid-phase sintered at 600° C. for 4 hours to obtain carbon-coated lithium manganate nanowires.

Embodiment 3

[0026] Step 1: Calcining 1 part of manganese sulfate and 15 parts of potassium nitrate at 380° C. in air for 3 hours to obtain a precursor of manganese oxide nanowires;

[0027] Step 2: Put 2g of glucose and 2g of the precursor in a hydrothermal axe, react at 180°C for 2h, and coat the carbon layer on the surface of the manganese oxide nanowires;

[0028] Step 3: 2.05 parts of carbon-coated manganese oxide nanowires and 1 part of lithium hydroxide were solid-phase sintered at 700° C. for 2 hours to obtain carbon-coated lithium manganate nanowires.

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Abstract

Preparation of a C-coated LiMn2O4 nanowire with a high-temperature solid-state method comprises the following steps: firstly, preparing a MnO nanowire precursor; secondly, placing glucose and the precursor in a hydrothermal reactor in proportion for a reaction at a certain temperature and coating a MnO nanowire with a C layer; finally, performing solid-state sintering on the MnO nanowire coated with the C layer and LiOH in proportion at a high temperature to obtain the C-coated LiMn2O4 nanowire. C-coated LiMn2O4 can be prepared, keeps nanowire morphology and has the characteristics of being simple to operate and low in cost.

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 high-temperature solid-phase method for preparing carbon-coated lithium manganate nanowires. Background technique [0002] Lithium manganate (LiMn 2 o 4 ) is a lithium battery positive electrode material, which has a high potential window, cheap raw materials, high rate performance and high specific capacity, and has been successfully applied in the production of lithium ion batteries. Traditional LiMn 2 o 4 It is prepared by high-temperature solid-phase method, and the morphology is all micron particles. The micron size is not conducive to the rapid diffusion transport of electrons and lithium ions. In order to further improve its specific capacity, rate performance and cycle stability, nanometer-sized LiMn can be prepared by nanotechnology. 2 o 4 . [0003] LiMn 2 o 4 With a polyhedral structure, it is di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/505H01M4/628H01M10/0525Y02E60/10
Inventor 郑鹏刘婷郭守武
Owner SHAANXI UNIV OF SCI & TECH
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