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High magnifying power lithium-rich manganese-based cathode material with nano/microstructure

A cathode material, lithium-rich manganese-based technology, which is applied in the field of high-rate lithium-rich manganese-based cathode materials and their preparation, can solve the problems of rapid capacity decay, low conductivity of lithium-rich manganese-based cathode materials, and poor high-rate performance. Achieve the effect of reliable performance improvement, obvious performance improvement and simple process

Active Publication Date: 2014-11-19
哈尔滨博尔特能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium-rich manganese-based cathode materials have low electrical conductivity, poor high-current discharge and high-rate performance, and rapid capacity decay during cycling. These shortcomings have become technical bottlenecks that limit the application of lithium-rich manganese-based cathode materials.

Method used

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  • High magnifying power lithium-rich manganese-based cathode material with nano/microstructure
  • High magnifying power lithium-rich manganese-based cathode material with nano/microstructure
  • High magnifying power lithium-rich manganese-based cathode material with nano/microstructure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh manganese sulfate, polyvinylpyrrolidone and sodium chlorate in a molar ratio of 1:1.1:3, stir and dissolve with an appropriate amount of deionized water until clear, transfer the mixed solution into a high-pressure reactor lined with polytetrafluoroethylene, and Place in an oven at 180°C, control the reaction time for 12 hours, wait for the reaction kettle to cool down to room temperature naturally, filter to obtain a black precipitate, wash it repeatedly with deionized water and ethanol until the pH is 7, and place it in an oven at 110°C to dry for 48 hours , the obtained black manganese dioxide powder has a radial hollow nanostructure formed by the self-assembly of nanorods, such as figure 1 , 2 shown;

[0032] Weigh lithium hydroxide, nickel acetate, and manganese dioxide at a molar ratio of Li:Ni:Mn=1.2:0.2:0.6, and mix them uniformly in a mixed solution of deionized water and ethanol; Raise it to 500°C, pre-calcine for 5 hours, then raise it to 750°C at the...

Embodiment 2

[0035] Weigh manganese nitrate, polyvinylpyrrolidone and sodium chlorate in a molar ratio of 1:1:4, stir and dissolve with an appropriate amount of deionized water until clear, transfer the mixed solution into a high-pressure reactor lined with polytetrafluoroethylene, and Place in an oven at 200°C, control the reaction time for 10 hours, wait for the reaction kettle to cool down to room temperature naturally, filter to obtain a black precipitate, wash it repeatedly with deionized water and ethanol until the pH is 7, and place it in an oven at 110°C to dry for 48 hours , the obtained black manganese dioxide powder has a radial hollow nanostructure formed by self-assembly of nanorods;

[0036]Weigh lithium acetate, cobalt acetate, and manganese dioxide in a molar ratio of Li:Co:Mn=1.2:0.2:0.6, and mix them uniformly in a mixed solution of deionized water and ethanol; to 500°C, pre-calcined for 5 hours, then raised to 750°C at the same heating rate, and calcined for 8 hours to o...

Embodiment 3

[0039] Weigh manganese oxalate, cetyltrimethylammonium bromide and sodium chlorate in a molar ratio of 1:1:4, stir and dissolve with an appropriate amount of deionized water until clear, and transfer the mixed solution into a polytetrafluoroethylene-lined In a high-pressure reaction kettle, place it in an oven at 200°C, and control the reaction time for 10 hours. After the reaction kettle is naturally cooled to room temperature, filter to obtain a black precipitate, wash it repeatedly with deionized water and ethanol until the pH is 7, and place it in Dry in an oven at 110°C for 48 hours to obtain a black manganese dioxide powder with a radial hollow nanostructure formed by self-assembly of nanorods;

[0040] Weigh lithium oxalate, nickel oxalate, and manganese dioxide at a molar ratio of Li:Mn:Ni=1.13:0.3:0.57, and mix them uniformly in a mixed solution of deionized water and ethanol; to 500°C, pre-calcined for 5 hours, then raised to 800°C at the same heating rate, and calci...

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Abstract

The invention relates to a high magnifying power lithium-rich manganese-based cathode material with a nano / microstructure, which belongs to the technical field of material synthesis. A chemical reaction of the cathode material is aLi2MnO3.(1-a)LiMO2, wherein a is greater than or equal to 0.3 and less than 1, M is NixCoyMn1-x-y, wherein x is greater than or equal to 0 and less than 0.5, and y is greater than or equal to 0 and less than 0.5. A preparation method comprises the following steps: 1)weighing manganese salt, a surfactant and sodium chlorate, uniformly mixing, performing a hydrothermal reaction to obtain radicalized hollow nano / microstructure formed by self assembly of a manganese dioxide nanorod; 2)uniformly mixing manganese dioxide with the nano / microstructure obtained in the step 1) with lithium salt, cobalt salt and nickel salt to obtain a precursor; and 3)calcining the precursor at high temperature to obtain the lithium-rich manganese-based cathode material with nano / microstructure. The method uses the advantage of short diffusion path of a carrier of a nanostructure in the nano / microstructure to effectively increase the multiplying power capacity of the material, and the method also uses characteristics of low surface energy, difficult agglomeration and high chemical stability of a micrometer structure for keeping the cycle performance of the material.

Description

technical field [0001] The invention belongs to the technical field of material synthesis, and relates to a lithium-ion battery cathode material and a preparation method thereof, in particular to a nano-microstructure high-rate lithium-rich manganese-based cathode material and a preparation method thereof. Background technique [0002] Lithium-ion battery is currently the battery system with the highest energy density in the secondary battery system. It has significant advantages such as no memory effect, high working voltage, and low self-discharge rate. It has been widely used in the field of portable electronic devices, and it is also used in electric vehicles and Fields such as energy storage power stations have also shown great application prospects. [0003] For the existing cathode materials, LiCoO 2 Due to the strong oxidation of the electrolyte during deep charging and the destruction of its own structure by excessive delithiation, its actual usable capacity is onl...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/131H01M4/505H01M4/525B82Y30/00B82Y40/00
CPCH01M4/505H01M10/0525Y02E60/10
Inventor 王振波玉富达刘宝生张音薛原顾大明
Owner 哈尔滨博尔特能源科技有限公司
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