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Positive active material, preparation method thereof, positive electrode and high-specific energy power battery

A positive electrode active material and positive electrode technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of inability to isolate materials, erosion, and inability to play a coating role, and achieve excellent electrical conductivity, reduce side reactions, and improve electrical conductivity sexual effect

Active Publication Date: 2019-03-05
SHENZHEN BYD LITHIUM BATTERY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Deficiencies: The resulting nanoscale carbon airgel / Li 5 FeO 4 Due to the porosity of nano-scale carbon airgel, the material cannot achieve a good coating effect, and cannot isolate the water in the air from Li 5 FeO 4 material erosion
[0005] Deficiencies: Mo 2 C acts only as a conductive agent with Li 5 FeO 4 Physical mixing together does not play a role in coating, and cannot isolate the water in the air from Li 5 FeO 4 material erosion

Method used

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  • Positive active material, preparation method thereof, positive electrode and high-specific energy power battery
  • Positive active material, preparation method thereof, positive electrode and high-specific energy power battery

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preparation example Construction

[0028] The present application also provides a method for preparing a positive electrode active material, wherein the method includes:

[0029] S1, will Li 5 FeO 4 , carbon source and molybdenum source are mixed according to the mass ratio of 80-94: 6.5-51.5: 4.7-26, and sintered under an inert atmosphere to obtain Li 5 FeO 4 / C+Mo 2 C cathode active material.

[0030] Preferably, the high temperature sintering temperature is 700~900°C, and the sintering time is 2~48h; the inert atmosphere is one of helium, neon or argon; the carbon source is selected from sucrose, glucose, epoxy resin One or more of polyvinyl alcohol and phenolic resin.

[0031] In the above preparation method, the intermediate material Li 5 FeO 4 Mixed with molybdenum source and carbon source and then sintered to generate carbon and Mo 2 In the process of C coating layer, the carbon source is first carbonized to form and Li 5 FeO 4 The elemental carbon in close contact with the molybdenum source, t...

Embodiment approach

[0055] Among them, the separator can be selected from various separators used in high specific energy power batteries known to those skilled in the art, such as polyolefin microporous membrane (PP), polyethylene felt (PE), glass fiber felt or ultrafine glass fiber paper Or PP / PE / PP. As a preferred embodiment, the separator is PP / PE / PP.

[0056] The preparation method of the high specific energy power battery provided by the present invention can be a method known to those skilled in the art. Generally speaking, the method includes sequentially winding the positive electrode, the negative electrode and the separator between the positive electrode and the negative electrode to form a pole core , put the pole core into the battery case, add electrolyte, and then seal, wherein, the methods of winding and sealing are well known to those skilled in the art. The amount of electrolyte used is conventional. The electrolyte can also be replaced by one of all solid electrolytes, solid ...

Embodiment 1

[0060] Preparation of positive electrode active material:

[0061] LiOH·H 2 O and Fe 2 o 3 Mix according to the molar ratio of 10:1, place in a stirring ball mill and mix and grind for 8 hours; place the precursor prepared by fully mixing and grinding in a corundum crucible; put the crucible in a tube furnace, blow in nitrogen, and start heating from room temperature, The heating rate was 5 °C / min, the temperature was raised to 850 °C for 20 h, and then naturally cooled to room temperature to obtain Li 5 FeO 4 Material. Will Li 5 FeO 4 、MoO 3 Mix with glucose at a mass ratio of 100:7.7:25.9, place in a stirring ball mill, add ethanol, and wet mix and grind for 6 hours; dry the precursor prepared by fully mixing and grinding, and place it in a corundum crucible; put the crucible into a tubular In the furnace, Ar gas was introduced and heated from room temperature with a heating rate of 5 °C / min, and the temperature was raised to 800 °C for 10 h, and then naturally coole...

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Abstract

The invention provides a positive active material. The positive active material comprises a core and a coating layer, wherein the coating layer is arranged on a surface of the core, the material of the core comprises Li5FeO4, and the material of the coating layer comprise Mo2C and carbon. A preparation method of the positive active material, a positive electrode comprising the positive active material and the high-specific energy power battery are also provided. With the positive active material provided by the invention, the influence of water in air on the core layer Li5FeO4 can be isolated,the material stability is improved, and the conductivity and the stability of the battery are improved.

Description

technical field [0001] The invention relates to the field of positive electrode active materials, in particular to a positive electrode active material, a preparation method, a positive electrode and a battery. Background technique [0002] A kind of electrode material is disclosed in the prior art, and nano-scale carbon airgel / Fe 2 o 3 material, then dissolve LiOH in water, add nano-scale carbon airgel / Fe 2 o 3 The material is stirred, filtered, and dried to obtain a powder, and the powder is placed in a tube furnace, and the temperature is raised to 800-1000°C at a rate of 1-5°C / min under a nitrogen protective atmosphere, and the temperature is lowered after holding the heat for 16-20 hours. Obtain nanoscale carbon airgel / Li 5 FeO 4 Material. [0003] Deficiencies: The resulting nanoscale carbon airgel / Li 5 FeO 4 Due to the porosity of nano-scale carbon airgel, the material cannot achieve a good coating effect, and cannot isolate the water in the air from Li 5 FeO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M4/131
CPCH01M4/131H01M4/366H01M4/525H01M4/62H01M4/624H01M4/625H01M4/628Y02E60/10
Inventor 焦晓朋李世彩
Owner SHENZHEN BYD LITHIUM BATTERY
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