Iron-manganese-based positive electrode material, preparation method and application thereof

A cathode material, iron-manganese-based technology, applied in the field of iron-manganese-based cathode materials and their preparation, can solve problems such as poor first-efficiency of iron-manganese-based cathode materials, and achieve the effects of improving electrical performance, first effect and cycle performance.

Active Publication Date: 2021-08-20
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to provide an iron-manganese-based positive electrode material and its preparation method and application, so as to solve the problem of poor first effect of iron-manganese-based positive electrode materials in the prior art

Method used

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  • Iron-manganese-based positive electrode material, preparation method and application thereof
  • Iron-manganese-based positive electrode material, preparation method and application thereof
  • Iron-manganese-based positive electrode material, preparation method and application thereof

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Embodiment approach

[0035] According to another typical embodiment of the present application, a method for preparing an iron-manganese-based positive electrode material, the preparation method includes: combining an inorganic compound of lithium and Fe x mn y (OH) 2 The precursor is oxidized and sintered to obtain an iron-manganese-based positive electrode material, wherein, 0x mn y (OH) 2 The ratio of the total molar amounts of Fe and Mn in the precursor is 0.1:1˜0.5:1.

[0036] This application uses less lithium inorganic compounds and Fe x mn y (OH) 2 The precursor is oxidized and sintered, so that the finally prepared iron-manganese-based positive electrode material forms a lithium-poor structure. The lithium-poor structure not only ensures that the lithium content in the material is low, but also controls the valence state and crystal form of manganese well. On the one hand, part of the manganese in the material is positive tetravalent manganese. In the XRD spectrum of the iron-manga...

Embodiment 1

[0046] 1) Mix 500g ferrous chloride, 500g manganese acetate and 2000mL water in the reactor, add 300g ammonia complexing agent to the reactor, feed nitrogen into the reactor at a speed of 3L / min, heat the reactor When the dispersion liquid reaches 45°C, add sodium hydroxide solution to the reaction kettle to adjust the pH of the dispersion liquid to 12, and stir the dispersion liquid at 300rpm to carry out coprecipitation reaction. washed, and dried in an oven at 100 °C to obtain Fe 0.5 mn 0.5 (OH) 2 Precursor.

[0047] 2) In a dry environment, 100gFe 0.5 mn 0.5 (OH) 2 Precursor and 18.8g lithium hydroxide (n Li :( Fe +n Mn )=0.4) ball milled until uniform.

[0048] 3) Place the uniformly mixed material in a Nabertherm box furnace, and feed air into the box furnace at a flow rate of 4L / min, and raise the temperature to 700°C at a heating rate of 2°C / min, and keep it warm for 9 hours. Cool down to 100°C at a cooling rate of 3°C / min to obtain Li 0.4 Fe 0.5 mn 0.5 o ...

Embodiment 2

[0050] 1) Mix 500g ferrous chloride, 500g manganese acetate and 2000mL water in the reactor, add 300g ammonia complexing agent to the reactor, feed nitrogen into the reactor at a speed of 3L / min, heat the reactor When the dispersion liquid reaches 45°C, add sodium hydroxide solution to the reaction kettle to adjust the pH of the dispersion liquid to 12, and stir the dispersion liquid at 300rpm to carry out coprecipitation reaction. washed, and dried in an oven at 100 °C to obtain Fe 0.5 mn 0.5 (OH) 2 Precursor.

[0051] 2) In a dry environment, 100gFe 0.5 mn 0.5 (OH) 2 Precursor and 18.8g lithium hydroxide (n Li :( Fe +n Mn )=0.4) ball milled until uniform.

[0052] 3) Place the uniformly mixed material in a Nabertherm box furnace, and feed air into the box furnace at a flow rate of 4L / min, and raise the temperature to 700°C at a heating rate of 2°C / min, and keep it warm for 9 hours. An intermediate product is obtained.

[0053] 4) Under the above-mentioned air vent...

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Abstract

The invention provides an iron-manganese-based positive electrode material, and a preparation method and an application thereof. The iron-manganese-based positive electrode material is LiaFexMnyO2, a is equal to 0.1-0.5, x is greater than 0 and less than 1.0, y is greater than 0 and less than 1.0, x + y is equal to 1, the valence state of at least a part of manganese elements in the iron-manganese-based positive electrode material is positive tetravalent, and the maximum intensity of a characteristic peak of a Li2MnO3 crystal phase in an XRD spectrogram of the iron-manganese-based positive electrode material is less than 1 / 3 of the intensity of the strongest characteristic peak of the iron-manganese-based positive electrode material or the characteristic peak of the Li2MnO3 crystal phase does not appear. By controlling the components and the crystal structure of the iron-manganese-based positive electrode material, the first effect and the cycle performance are well improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to an iron-manganese-based positive electrode material and a preparation method and application thereof. Background technique [0002] With the increasingly prominent problems of energy crisis and environmental pollution, the development and utilization of new energy is imperative. In the next few years, the application demand of lithium-ion batteries in the new energy vehicle industry will continue to increase. [0003] In new energy vehicles, lithium-ion batteries occupy a core position, and in lithium-ion batteries, cathode materials are the most important. Taking the NCM523 power battery as an example, the positive electrode material accounts for as much as 32% of the cost, while the electrolyte, separator and negative electrode account for only about 25%. In addition to the cost factor, the electrochemical performance of the cathode material is also closely related ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/1391H01M4/131H01M4/04
CPCH01M4/505H01M4/525H01M4/0471H01M4/131H01M4/1391H01M2004/028Y02E60/10
Inventor 陈思贤江卫军许鑫培郑晓醒
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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