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Method of preparing positive electrode composite material of Lithium ion cell contg, ferrous phosphate lithium salt-carbon

A technology for lithium ferrous phosphate and lithium-ion batteries, which is applied in electrode manufacturing, battery electrodes, phosphorus compounds, etc. It can solve the problems of difficult control of product purity, complicated preparation process, and high price, and achieve excellent cycle performance and high purity. , cheap effect

Inactive Publication Date: 2005-01-12
宜春天赐高新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the conductivity of this material is very poor, and it can only be charged and discharged at a very small rate at room temperature, and its preparation requires Fe 2+ As iron source, the price is higher than Fe 3+ The salt is high and requires multiple heat treatments and grinding, the preparation process is complicated, and the product purity is not easy to control, which increases the cost, which greatly limits its application in actual lithium-ion batteries

Method used

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  • Method of preparing positive electrode composite material of Lithium ion cell contg, ferrous phosphate lithium salt-carbon

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Mix 0.5 mole of lithium hydroxide and 0.5 mole of iron phosphate, put it into a nylon tank, and add 80ml of alcohol, mix it on a ball mill for 2 hours, then blend the mixture into 14 grams of polypropylene and put it in a tube furnace, and heat it at 5 Under a nitrogen atmosphere of 1 / min, the temperature was raised to 700°C at a rate of 5°C / min, kept at this temperature for 10 hours, and then cooled to room temperature.

[0019] The measured carbon content in the resulting composite material is 2.5%, and its XRD spectrum is shown in figure 1 , compared with the standard card, it is olivine LiFePO with intact crystal form 4 , while no carbon diffraction peak was observed.

[0020] Using the composite material obtained in Example 1, an electrode was prepared in the following manner.

[0021] Take the composite material obtained in Example 1 at a mass ratio of 80: 10: 10: carbon black: polytetrafluoroethylene, and grind it evenly to make an electrode. 1.0mol / L LiPF in ...

Embodiment 2

[0023] Mix 0.5 moles of lithium hydroxide, 0.25 moles of ferric oxide and 0.5 moles of ammonium dihydrogen phosphate and put them into a nylon tank, add 80ml of alcohol, mix well on a ball mill for 2 hours, then blend the mixture into 20 grams The polypropylene was placed in a tube furnace, and was raised to 700°C at a rate of 5°C / min under a nitrogen atmosphere of 5 liters / min, and kept at this temperature for 20 hours, and then cooled to room temperature. The carbon content of the obtained composite material was measured to be 4.6%. The electrode sheet was also prepared according to the method of Example 1. After being assembled into a battery, it was charged and discharged at a rate of 0.2C. The measured reversible capacity was 157mAh / g.

Embodiment 3

[0025] Mix 0.5 mole of lithium hydroxide and 0.5 mole of iron phosphate, put it in a nylon tank, and add 80ml of alcohol, mix it on a ball mill for 1 hour, then mix the mixture with 25 grams of polyethylene and put it in a tube furnace. Under a nitrogen atmosphere of liters / min, the temperature was raised to 500°C at a rate of 5°C / min, kept at this temperature for 24 hours, and then cooled to room temperature. The carbon content of the obtained composite material was measured to be 3.1%, and the electrode sheet was prepared according to the method of Example 1. After being assembled into a battery, it was charged and discharged at a rate of 0.5C, and the measured reversible capacity was 148mAh / g.

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Abstract

The preparation method includes following procedures: mixing certain proportional lithium salt, Fe3+ compound and phosphate evenly by using one-step solid phase method; with a given amount of high polymer being added, in atmosphere of inert gases, pyrolyzing admixture obtains composite material of lithium salt-carbon anode based on ferrous phosphate. Features are: no need of expensive Fe2+, simple technique, ans safe. High purity of composite material, high specific capacity and cycle performance, providing 3.4V power source for mobile phone etc.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode composite material of a lithium ion battery, in particular to a preparation method of a ferrous phosphate-based lithium salt-carbon composite material. Background technique [0002] Lithium-ion battery is a new type of green high-energy rechargeable battery that appeared in the early 1990s, and has become the focus of research and development all over the world. The positive electrode material is an important part of the lithium-ion battery. During the charging and discharging process of the lithium-ion battery, it is not only necessary to provide the lithium required for the reciprocal intercalation / extraction in the positive and negative lithium intercalation compounds, but also to bear the burden of forming SEI on the surface of the negative electrode material. Therefore, research and development of high-performance cathode materials have become the ke...

Claims

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Application Information

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IPC IPC(8): C01B25/00C01D15/00C01G1/02H01M4/02H01M4/04H01M4/36H01M4/48H01M4/58H01M10/36
CPCH01M4/5825Y02E60/122H01M10/0525H01M4/133H01M4/366H01M4/136Y02E60/10
Inventor 米常焕曹高劭赵新兵
Owner 宜春天赐高新材料有限公司
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