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Lithium battery carbon and nitrogen nanotube / lithium manganate electrode material preparation method

A technology of carbon-nitrogen nanotubes and electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of long preparation time, short cycle life, complicated process, etc., and achieve current rate discharge and high current rate discharge , Reduce the effect of polarization internal resistance

Inactive Publication Date: 2015-10-07
SHANDONG YUHUANG NEW ENERGY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the material is synthesized by the traditional high-temperature solid-phase method, which has high energy consumption, long preparation time, poor batch stability, low gram capacity, and short cycle life.
In addition, carbon nanotubes need surface acidification or esterification treatment before use, the process is complicated and not friendly to the environment, in order to achieve uniform dispersion of carbon nanotubes, it is necessary to add expensive dispersants (TNWDIS or SDS, etc.)

Method used

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  • Lithium battery carbon and nitrogen nanotube / lithium manganate electrode material preparation method
  • Lithium battery carbon and nitrogen nanotube / lithium manganate electrode material preparation method
  • Lithium battery carbon and nitrogen nanotube / lithium manganate electrode material preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Post-treatment preparation content of 0.5 wt% carbon nitrogen nanotube modified lithium manganate material 0.5wt% NCNTs / LMO:

[0034] (1) Weigh 0.5 g of carbon nitrogen nanotubes and place them in 50% absolute ethanol for ultrasonic dispersion for 1 h.

[0035] (2) Weigh 99.5 g of lithium manganate and place it in 50% absolute ethanol for ultrasonic dispersion for 1 h.

[0036] (3) Add carbon-nitrogen nanotubes to the lithium manganate positive electrode material after ultrasonic dispersion, and the mixture is stirred and ultrasonicated several times, and then dried in an oven.

[0037] (4) The dried mixture is in N 2 Heat treatment at 300°C for 1 h in atmosphere.

[0038] (5) The heat-treated material was mixed with the conductive agent Super-p and the binder polyvinylidene fluoride in a ratio of 94.5:3:2.5 to obtain a carbon nitrogen nanotube / lithium manganate electrode material 0.5wt% NCNTs / LMO.

[0039] The carbon nitrogen nanotube / lithium manganese oxide electro...

Embodiment 2

[0041] Preparation of 2 wt% NCNTs / LMO modified lithium manganese oxide material with 2 wt% carbonitride nanotubes after post-treatment:

[0042] (1) Weigh 2 g of carbon nitrogen nanotubes and place them in 50% absolute ethanol for ultrasonic dispersion for 1 h.

[0043] (2) Weigh 98 grams of lithium manganate and place it in absolute ethanol for ultrasonic dispersion for 1 h.

[0044] (3) Add carbon-nitrogen nanotubes to the lithium manganate positive electrode material after ultrasonic dispersion, and the mixture is stirred and ultrasonicated several times, and then dried in an oven.

[0045] (4) The dried mixture is in N 2 Heat treatment at 300 °C for 1 h in atmosphere.

[0046] (5) The heat-treated material was mixed with the conductive agent Super-p and the binder polyvinylidene fluoride in a ratio of 94.5:3:2.5 to obtain a carbon nitrogen nanotube / lithium manganate electrode material 2wt% NCNTs / LMO.

[0047] The carbon nitrogen nanotube / lithium manganese oxide electrod...

Embodiment 3

[0049] Preparation of 5 wt% carbonitride nanotube modified lithium manganese oxide material 5 wt% NCNTs / LMO after post-treatment:

[0050] (1) Weigh 5 g of carbon nitrogen nanotubes and place them in 50% absolute ethanol for ultrasonic dispersion for 1 h.

[0051] (2) Weigh 95 grams of lithium manganate and place it in absolute ethanol for ultrasonic dispersion for 1 h.

[0052] (3) Add carbon-nitrogen nanotubes to the lithium manganate positive electrode material after ultrasonic dispersion, and the mixture is stirred and ultrasonicated several times, and then dried in an oven.

[0053] (4) The dried mixture is in N 2 Heat treatment at 300 °C for 1 h in atmosphere.

[0054] (5) The heat-treated material was mixed with the conductive agent Super-p and the binder polyvinylidene fluoride at a ratio of 94.5:3:2.5 to obtain a carbon nitrogen nanotube / lithium manganate electrode material 5wt% NCNTs / LMO.

[0055] The carbon nitrogen nanotube / lithium manganese oxide electrode materi...

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Abstract

The present invention discloses a lithium battery carbon and nitrogen nanotube / lithium manganate electrode material and a preparation method thereof, and the preparation method comprises the following steps: (1) carbon and nitrogen nanotubes are ultrasonically dispersed in a lower alcohol solution; (2) lithium manganate or a mixture of lithium and manganese salts is ultrasonically dispersed in a lower alcohol solution; (4) the dispersed material of the step (2) is added into the dispersed carbon and nitrogen nanotube alcohol solution, and the mixture is mixed, ultrasonically treated for a plurality of times, and is placed in an oven for drying; (5) the died mixture is thermally treated in inert atmosphere N2 or Ar to obtain an active material; (6) the thermally treated active material, conductive agent Super-p and binder polyvinylidene fluoride are mixed proportionally to obtain the carbon and nitrogen nanotube / lithium manganate electrode material. The carbon and nitrogen nanotube / lithium manganate electrode material is simple in process, low in cost, mild in conditions, and environment-friendly, large-scale production is easy to implement, and the prepared carbon and nitrogen nanotube / lithium manganate electrode material has high rate performance and long cycle life.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery cathode material, in particular to a preparation method of a carbon nitrogen nanotube / lithium manganate electrode material for a lithium battery. Background technique [0002] With the increasingly prominent problems of energy crisis, environmental pollution, and climate warming, we are urgently required to develop green new energy sources, such as solar energy, wind energy, geothermal energy, nuclear energy, tidal energy, and long-life secondary batteries. Lithium-ion battery is a new type of secondary battery that can replace lead-acid batteries. It has the advantages of high energy density, many charge and discharge times, good safety performance, and environmental friendliness. Lithium-ion batteries are mainly composed of positive electrode materials, negative electrode materials, electrolytes, and separators. The positive electrode materials largely restrict the further...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M10/0525H01M4/62
CPCH01M4/505H01M4/625H01M10/0525Y02E60/10
Inventor 吕金钊李进潘刘宁宁陈晓赵成龙易江平王瑛
Owner SHANDONG YUHUANG NEW ENERGY TECH