Method for synthesizing manganese lithium phosphate/carbon serving as positive material of lithium ion battery

A lithium-ion battery and synthesis method technology, which is applied in the field of carbon-coated phosphate cathode materials, can solve the problems of low purity of synthetic products and cumbersome operations, and achieve the effects of easy control of experimental conditions, accelerated reaction speed, and reduced production costs

Inactive Publication Date: 2011-05-25
GUANGZHOU HKUST FOK YING TUNG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The synthesis method uses lithium salt, manganese salt and phosphate as raw materials, after pre-calcination, carbon reduction an

Method used

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  • Method for synthesizing manganese lithium phosphate/carbon serving as positive material of lithium ion battery
  • Method for synthesizing manganese lithium phosphate/carbon serving as positive material of lithium ion battery
  • Method for synthesizing manganese lithium phosphate/carbon serving as positive material of lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0025] Preparation of ethanol solution of phenolic resin

[0026] Using resorcinol (AR) and formaldehyde aqueous solution (CR) with a mass percent concentration of 36% as raw materials, dissolve 0.03mol resorcinol and 0.02mol formaldehyde in deionized water, add a small amount of LiOH as a catalyst, and heat at 80°C Heat in a water bath until it becomes gel, dissolve it with 20ml of absolute ethanol while it is still hot, cool to room temperature for later use, and finally obtain an ethanol solution of phenolic resin. After calculation, the carbon element in the phenolic resin has a concentration of 10mol / L in the ethanol solution of the phenolic resin.

[0027] The preparation method of the one-step solid-phase method synthesis lithium manganese phosphate material of the present embodiment, its steps are as follows:

[0028] 1) Mixing process

[0029] Raw material: 0.8g Li 2 CO 3 , 2.32g NH 4 h 2 PO 4 and 2.3gMnCO 3 (the mol ratio of lithium, manganese, phosphorus is ...

Embodiment 2

[0040] Preparation of ethanol solution of phenolic resin

[0041] Using resorcinol (AR) and formaldehyde aqueous solution (CR) with a mass percent concentration of 36% as raw materials, dissolve 0.03mol resorcinol and 0.02mol formaldehyde in deionized water, add a small amount of LiOH as a catalyst, and heat at 80°C Heat in a water bath until it becomes gel, dissolve it with 20ml of absolute ethanol while it is still hot, cool to room temperature for later use, and finally obtain an ethanol solution of phenolic resin. After calculation, the concentration of C atoms in the phenolic resin in the ethanol solution of the phenolic resin is 10mol / L.

[0042] The preparation method of the one-step solid-phase method synthesis lithium manganese phosphate material of the present embodiment, its steps are as follows:

[0043] The first step, the mixing process

[0044] Raw material: 0.89g LiOH·H 2 O, 2.32g NH 4 h 2 PO 4 and 2.3gMnCO 3 (the molar ratio of lithium, manganese, and p...

Embodiment 3

[0051] The preparation method of the one-step solid-phase method synthesis lithium manganese phosphate material of the present embodiment, its steps are as follows:

[0052] The first step, the mixing process

[0053] Take 0.80g Li 2 CO 3 , 2.32g NH 4 h 2 PO 4 and 2.3gMnCO 3 (the molar ratio of lithium, manganese, and phosphorus is 1.05:1:1) into the ball mill jar, then add 0.471g of glucose (calculated, the quality of the carbon element in the glucose is 3.5% of the raw material quality), and finally add acetone to dissolve the raw material and glucose Submerged and ball milled at 250rpm for 12h.

[0054] In the second step, the mixture is dried

[0055] After the ball milling is completed, the obtained mixture is taken out and placed in an evaporating dish, dried at 100° C., and ground into a powder.

[0056] The third step, calcining

[0057] Transfer the powder of the above mixture to a porcelain boat, in the Ar-H 2 (where H 2 The volume fraction is 10%), using ...

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Abstract

The invention discloses a method for synthesizing manganese lithium phosphate/carbon serving as a positive material of a lithium ion battery. The method comprises the following steps of: 1) mixing materials, namely adding a lithium source compound, a phosphorous source compound and a manganese source compound serving as raw materials into a ball mill jar, adding a carbon source compound, adding liquid medium until the raw materials and the carbon source compound are immersed and ball-milling until all the materials are uniform; 2) drying the ball-milled mixture, namely taking the mixture obtained in the step 1) out, putting into an evaporating dish, drying and grinding into powder; and 3) calcining at a high temperature, namely calcining the mixture powder obtained in the step 2) in an inert atmosphere at the temperature of between 500 and 800 DEG C for 1 to 12 hours to obtain the carbon-coated manganese lithium phosphate. The method has a simple synthesis process and easily controlled experimental conditions, the production cost of the manganese lithium phosphate is reduced, and the implementation of industrial production is facilitated; and the prepared positive material of the lithium ion battery has high electrochemical performance.

Description

technical field [0001] The technical solution of the present invention relates to a method for synthesizing lithium manganese phosphate lithium / carbon as a positive electrode material for lithium ions, in particular to a method for synthesizing carbon-coated phosphate positive electrode materials for lithium ion batteries by a one-step solid phase method. Background technique [0002] As a new type of green power source, lithium-ion batteries have always been the focus of attention from all walks of life. In recent years, lithium-ion batteries have gradually been applied in the fields of large-capacity batteries such as power and energy storage. The continuous improvement of electrode materials has always been the key to promoting the development of lithium-ion battery technology. Advanced electrode materials constitute the core technology for the current replacement of lithium-ion batteries. Lithium-ion secondary batteries with phosphate-based cathode materials represented...

Claims

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Application Information

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IPC IPC(8): H01M4/1397
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 刘学武刘贵昌杨新施志聪陈国华
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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