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Preparation method of cathode material, cathode material, and battery

A positive electrode material and iron source technology, applied in the field of batteries, can solve the problems of limited commercial application, low ion and electronic conductivity, etc., achieve excellent cycle performance and rate performance, low production cost, and reduce production cost.

Inactive Publication Date: 2016-04-20
苏州艾美得新能源材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, in order to improve LiFePO 4 discharge voltage platform, the LiFePO 4 Part or all of the iron is replaced by manganese to obtain lithium iron manganese phosphate (LiMn x Fe 1-x PO 4 ,0-10 S cm -1 ) shortcomings limit the current commercial application

Method used

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  • Preparation method of cathode material, cathode material, and battery
  • Preparation method of cathode material, cathode material, and battery
  • Preparation method of cathode material, cathode material, and battery

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preparation example Construction

[0041] The present invention proposes a preparation method of a positive electrode material, and the preparation method has the following steps:

[0042] The lithium source, the manganese source, the iron source, and the phosphorus source are mixed according to the material ratio of Li, Mn, Fe, and P of 1:x:1-x:1, wherein 0≤x<1, and the iron source includes the first An iron source and a second iron source, wherein the material ratio of the first iron source and the second iron source ranges from 2:8 to 8:2;

[0043] The mixed product is calcined in an inert atmosphere to obtain a calcined product, the calcination temperature is 300-550°C, and the calcination time is 2-20h;

[0044] The pre-sintered product is mixed with the carbon source and sintered in an inert atmosphere, the sintering temperature is 600-900 DEG C, and the sintering time is 2-20 hours.

[0045] The preparation method of the present invention includes two situations, corresponding to the preparation method ...

Embodiment approach 1

[0048] When x=0, the present invention is a lithium iron phosphate (LiFePO 4 ) preparation method, comprising the following steps:

[0049]The lithium source, the iron source, and the phosphorus source are mixed according to the material ratio of Li, Fe, and P at 1:1:1, wherein the iron source includes a first iron source and a second iron source, and the first iron source and The material ratio range of the second iron source is 2:8-8:2;

[0050] The mixed product is calcined in an inert atmosphere to obtain a calcined product, the calcination temperature is 300-550°C, and the calcination time is 2-20h;

[0051] The pre-sintered product is mixed with the carbon source and sintered in an inert atmosphere, the sintering temperature is 600-900 DEG C, and the sintering time is 2-20 hours.

[0052] The iron source in the present invention is ferrous oxalate, ferric oxalate, ferrous acetate, ferric acetate, ferrous nitrate, ferric nitrate, ferric phosphate, ferric oxide, ferrous ...

Embodiment approach 2

[0070] When 0x Fe 1-x PO 4 ) preparation method, comprising the following steps:

[0071] The lithium source, the manganese source, the iron source, and the phosphorus source are mixed according to the material ratio of Li, Mn, Fe, and P 1:x:1-x:1, wherein 0<x<1, wherein the iron source includes the first iron source and a second iron source, the material ratio of the first iron source and the second iron source ranges from 2:8 to 8:2;

[0072] Drying, pre-sintering the dried product in an inert atmosphere to obtain a pre-sintering product, the pre-sintering temperature is 300-550 °C, and the pre-sintering time is 2-20 h;

[0073] The pre-sintered product is mixed with the carbon source and sintered in an inert atmosphere, the sintering temperature is 600-900 DEG C, and the sintering time is 2-20 hours.

[0074] The manganese source in this embodiment is at least one of manganese chloride, manganese oxalate, manganese sulfate, manganese nitrate, manganese trioxide, manganes...

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Abstract

The invention discloses a preparation method of a cathode material. The preparation method comprises the following steps: mixing a lithium source, a manganese source, an iron source, and a phosphor source according to a weight ratio of Li:Mn:Fe:P of 1:x:(1-x):1, wherein 0<=x<1, the iron source comprises a first iron source and a second iron source, and the ratio of amount of substance of the first iron source to the second iron source is in a range of 2:8 to 8:2; after mixing, pre-burning the mixture in an inert atmosphere to obtain a product of pre-burning, mixing the product of pre-burning with a carbon source, and sintering the mixture in an inert atmosphere. The provided preparation method can reduce the cost and obtain a uniform cathode material. The invention also discloses a cathode material and a battery.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a preparation method of a positive electrode material. [0002] The present invention also relates to a positive electrode material and a battery using the positive electrode material. Background technique [0003] In the 1980s, in order to find environmentally friendly new energy materials, scientists developed rechargeable lithium secondary batteries based on lithium primary batteries. Since the cathode material is recognized as the most critical material in lithium-ion batteries, its performance will directly affect the performance of the battery (energy storage density, cycle life, safety, etc.), so its development is also the most worthy of attention. In Goodenough et al., layered lithium cobalt oxide (LiCoO 2 ) as a positive electrode material and commercialized by Sony Corporation in 1990, people have successively discovered other positive electrode materials for lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525C01B25/45
CPCY02E60/10
Inventor 陈春华邹邦坤胡郅虬马小航程涛
Owner 苏州艾美得新能源材料有限公司
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