Preparation method of carbon nano tube-modified layered lithium-enriched high-manganese positive electrode material

A carbon nanotube modification and positive electrode material technology, which is applied in battery electrodes, electrical components, circuits, etc., to achieve the effects of good cycle performance, fast charging speed, and high capacity

Active Publication Date: 2015-03-25
徐茂龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the excellent electrochemical properties of carbon nanotubes, and with the development of existing technologies, the lithium-rich cathode material xLi synthesized by the prior art 2 MnO 3 -(1-x)LiMO 2 Cathode materials can no longer meet the needs of existing technologies, which also poses a threat to the lithium-rich cathode material xLi 2 MnO 3 -(1-x)LiMO 2 Put forward higher requirements, such as synthesis time, charging time, high temperature cycle performance, high temperature storage performance and charging time, etc. need to be further improved

Method used

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  • Preparation method of carbon nano tube-modified layered lithium-enriched high-manganese positive electrode material
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  • Preparation method of carbon nano tube-modified layered lithium-enriched high-manganese positive electrode material

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Embodiment 1

[0030] Take lithium carbonate 8.62g, manganese carbonate 13.34g and nickel carbonate 5.94g respectively according to general formula metering ratio and mix and form mixture, described mixture is placed in agate mortar, adds dehydrated alcohol and carries out wet grinding to form homogeneous mixture, The uniformly ground mixture is vacuum-dried, and sintered at a temperature of 800° C. to form a bulk phase doped body. The bulk phase doped body is wet ground and dried to form a bulk phase doped powder. The bulk-phase doped powder is dispersed in the aluminum nitrate solution, ammonia water is added to adjust the pH value of the solution, the solution is dried and then ground, and then heat-treated at 400°C to form a precursor, and the obtained precursor is heated under a pressure of 100Mpa Hold the pressure for 2 minutes to form a green body, place the green body in the pyrophyllite cavity of the hot isostatic pressing equipment, heat and hold the pressure for 0.5 hours at a temp...

Embodiment 2

[0033] Take lithium carbonate 8.62g, manganese carbonate 13.34g and nickel carbonate 5.94g respectively according to general formula metering ratio and mix and form mixture, described mixture is placed in agate mortar, adds dehydrated alcohol and carries out wet grinding to form homogeneous mixture, The uniformly ground mixture is vacuum-dried, and sintered at a temperature of 800° C. to form a bulk phase doped body. The bulk phase doped body is wet ground and dried to form a bulk phase doped powder. The bulk-phase doped powder is dispersed in the aluminum nitrate solution, ammonia water is added to adjust the pH value of the solution, the solution is dried and then ground, and then heat-treated at 400°C to form a precursor, and the obtained precursor is heated under a pressure of 100Mpa Hold the pressure for 2 minutes to form a green body, place the green body in the pyrophyllite cavity of the hot isostatic pressing equipment, heat and hold the pressure for 0.5 hours at a temp...

Embodiment 3

[0036] Take lithium carbonate 8.62g, manganese carbonate 13.34g and nickel carbonate 5.94g respectively according to general formula metering ratio and mix and form mixture, described mixture is placed in agate mortar, adds dehydrated alcohol and carries out wet grinding to form homogeneous mixture, The uniformly ground mixture is vacuum-dried, and sintered at a temperature of 800° C. to form a bulk phase doped body. The bulk phase doped body is wet ground and dried to form a bulk phase doped powder. The bulk-phase doped powder is dispersed in the aluminum nitrate solution, ammonia water is added to adjust the pH value of the solution, the solution is dried and then ground, and then heat-treated at 400°C to form a precursor, and the obtained precursor is heated under a pressure of 100Mpa Hold the pressure for 2 minutes to form a green body, place the green body in the pyrophyllite cavity of the hot isostatic pressing equipment, heat and hold the pressure for 0.5 hours at a temper...

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Abstract

The invention relates to a preparation method of a carbon nano tube-modified layered lithium-enriched high-manganese positive electrode material. The preparation method comprises the following steps of mixing lithium salt, manganese salt and M salt to form a mixture, carrying out vacuum drying on the mixture, sintering, grinding so as to form a body phase-doped powder body, carrying out thermal treatment on the body phase-doped powder body so as to form a precursor, compressing the precursor to form a green body, and putting the green body into a pyrophyllite cavity so as to prepare a layered lithium-enriched high-manganese positive electrode material; and adding the layered lithium-enriched high-manganese positive electrode material, a polyvinylidene fluoride bonding agent and a conductive agent according to a proportion into an N-methyl pyrrolidone solution, stirring and drying so as to obtain the carbon nano tube-modified layered lithium-enriched high-manganese positive electrode material. The preparation method provided by the invention has the characteristics of high efficiency, rapidness and energy conservation; the lithium-enriched positive electrode material synthesized by adopting the synthesis method has the advantages of high capacity, high-temperature stability, good cycle performance, high compaction density, high charging speed and the like.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium battery, in particular to a preparation method of a carbon nanotube modified layered lithium-rich high manganese positive electrode material. Background technique [0002] At present, with the increasing requirements for energy storage equipment in the fields of electronic products, electric vehicles, energy storage power stations, and aerospace, lithium-ion batteries with high energy density, small size, and long cycle life are widely used. Among them, the traditional cathode material LiCoO 2 Low capacity and high cost; while LiNiO 2 Harsh synthesis conditions, poor reversibility; relatively cheap LiFePO 4 The ionic conductivity is poor, and the actual discharge specific capacity is only 160mAh / g. These lithium-ion battery cathode materials are difficult to meet the needs of high-capacity, high-energy-density electronic products. In recent years, lithium-ri...

Claims

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Application Information

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IPC IPC(8): H01M4/1393H01M4/1391H01M4/505
CPCH01M4/1391H01M4/1393H01M4/366H01M4/505H01M4/587Y02E60/10
Inventor 徐茂龙黄红如
Owner 徐茂龙
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