A kind of positive electrode active material and preparation method thereof, positive electrode and lithium ion battery

A positive electrode active material, a positive electrode technology, applied in the field of lithium ion battery positive electrode, positive electrode active material and its preparation, can solve the problems of manganese dissolution, poor conductivity, etc., and achieve the effects of reducing manganese dissolution, isolating contact, and low preparation cost

Active Publication Date: 2022-02-08
BYD CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of poor electrical conductivity and manganese dissolution in existing lithium iron manganese phosphate materials, the present invention provides a positive electrode active material with good rate performance and can effectively reduce the phenomenon of manganese dissolution during use, and a preparation method thereof, including the positive electrode active material. The positive electrode of the material and the lithium-ion battery

Method used

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  • A kind of positive electrode active material and preparation method thereof, positive electrode and lithium ion battery
  • A kind of positive electrode active material and preparation method thereof, positive electrode and lithium ion battery
  • A kind of positive electrode active material and preparation method thereof, positive electrode and lithium ion battery

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preparation example Construction

[0018] The present application also proposes a method for preparing a positive electrode active material, which includes: mixing a lithium manganese iron phosphate material with a carbon material attached to the surface and a molybdenum source, and then mixing it under an atmosphere of reducing gas and nitrogen, or under an atmosphere of ammonia. Sintering to obtain the above positive electrode active material. Preferably, the sintering temperature is 500-800° C., and the sintering time is 2-48 hours, so as to further optimize the coating layer. Preferably, the reducing gas is hydrogen. The reducing gas and nitrogen can form a mixed atmosphere, and the manganese iron phosphate lithium material with carbon materials attached to the surface can also be used to mix with the molybdenum source and then pass through the high-temperature reducing gas and nitrogen in turn. The present invention preferably combines the reducing gas and nitrogen to form a mixture Atmosphere: the lithiu...

Embodiment 1

[0028] LiH 2 PO 4 , MnCO 3 , FeC 2 o 4 Mix with glucose according to the molar ratio of 1:0.8:0.2:0.092, 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 into a tube furnace, and pass through Ar Gas, heating from room temperature, the heating rate is 5 ° C / min, the temperature is raised to 700 ° C for 10 h, and then naturally cooled to room temperature to obtain LiMn 0.8 Fe 0.2 PO 4 / C material. LiMn 0.8 Fe 0.2 PO 4 / C and MoO 3 Mix according to the mass ratio of 96:5.6, 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 in a tube furnace, and Into H containing 10% hydrogen by volume 2 / N 2 Mixed gas, heating from room temperature with a heating rate of 5°C / min, raising the temperature to 700°C for 15 hours, and then ...

Embodiment 2

[0030] LiH 2 PO 4 , MnCO 3 , FeC 2 o 4 Mix with glucose according to the molar ratio of 1:0.9:0.1:0.046, 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 into a tube furnace, and pass Ar Gas, heating from room temperature, the heating rate is 5 ° C / min, the temperature is raised to 700 ° C for 10 h, and then naturally cooled to room temperature to obtain LiMn 0.9 Fe 0.1 PO 4 / C material. LiMn 0.9 Fe 0.1 PO 4 / C and MoCl 5 Mix according to the mass ratio of 95:13.3, add water and stir for 1 hour, then spray dry, and place the obtained powder in a corundum crucible; put the crucible in a tube furnace, feed ammonia gas, and start heating from room temperature at a heating rate of 5°C / min, heated to 550°C for 20h, and then naturally cooled to room temperature to obtain a carbon content of 1wt.%, Mo 2 LiMn with 5wt.% N content 0.9 Fe 0.1 PO 4 / C / Mo 2 N c...

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Abstract

The invention belongs to the field of lithium ion batteries, and in particular relates to a positive electrode active material, a preparation method thereof, a positive electrode and a lithium ion battery. The positive active material comprises a core formed of a material containing lithium manganese iron phosphate, a first shell positioned on the surface of the core, and a second shell positioned on the surface of the first shell; the material of the first shell is carbon material, and the second shell is The material is Mo 2 N, which improves the conductivity of the material and solves the problem of manganese dissolution.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a positive electrode active material and a preparation method thereof, a lithium ion battery positive electrode containing the positive electrode active material, and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high specific energy, and good safety performance, and are more and more widely used. Especially with the popularity of electric vehicles and energy storage power stations, the requirements for them are getting higher and higher. [0003] Lithium manganese iron phosphate is a high-capacity, high-safety battery positive active material, but lithium manganese iron phosphate has: (1) poor conductivity; (2) in the charged state, Fe and Mn will occur from the positive active material (3) Excessive dissolution of metal ions will also lead to the destruction of the material structure and the degra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/58H01M10/0525C01B25/26C01B25/45C01B25/37
CPCH01M4/366H01M4/505H01M4/58H01M4/5825H01M10/0525C01B25/26C01B25/375C01B25/45Y02E60/10
Inventor 焦晓朋李世彩
Owner BYD CO LTD
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