Method of producing electrochemical active material

A technology of active materials and manufacturing methods, applied in chemical instruments and methods, inorganic chemistry, circuits, etc., can solve the problems of unstable sintering control, over-burning, power consumption, etc., and achieve good electrochemical stability and excellent electrochemical performance. , the effect of reducing product cost

Inactive Publication Date: 2011-07-20
赛福能源科技(徐州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Patent CN 101172597A proposes to use iron powder as iron source, but it is synthesized by ammonium dihydrogen phosphate, which also emits polluting gas
Patent CN101172599 proposes to use carbon coating to reduce the precursor composed of iron oxide and phosphoric acid to synthesize lithium iron phosphate. This preparation technology is relatively complicated and the cost is high, and carbon coating synthesis produces a large amount of carbon dioxide, which is discharged into the atmosphere and causes Pollution
At present, the industrial production of lithium iron phosphate materials adopts two methods: static sintering and dynamic sintering. Static sintering has unstable sintering control and is prone to overburning.
Dynamic sintering leads to uneven mixing of materials, incomplete reaction, large power consumption, and low production efficiency
Patent CN101186289 uses a vacuum rotary kiln to synthesize lithium iron phosphate, which lacks control over product synthesis. Too high a temperature leads to too large particles, resulting in inconsistencies in subsequent production

Method used

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  • Method of producing electrochemical active material
  • Method of producing electrochemical active material
  • Method of producing electrochemical active material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0022] Embodiment: A kind of manufacturing method of electrochemically active material, comprises adopting ball milling rotary furnace 1 to carry out material pulverization, mixing, synthesis and circulation, the furnace tube 2 of described ball milling rotary furnace 1 is provided with at least one with ball milling medium 4 Ball mill heating interval 3.

[0023] The material is mainly a mixture of ferrous salt, lithium salt and phosphate, the molar ratio of the ferrous salt, lithium salt and phosphate is 1:1:1, and the electrochemically active material is lithium ferrous phosphate.

[0024] The structure of ball milling rotary furnace 1 is as follows: figure 1 and figure 2 As shown, it includes a feed system 8, a discharge system 9, a furnace tube 2, a conventional heating zone 5 and two ball mill heating zones 3 distributed inside the furnace tube 2. The heating temperature and time of each zone are individually controlled by PID. There are baffles 7 on both sides of ea...

specific Embodiment 1

[0025] After fully mixing ferrous phosphate and lithium carbonate or lithium hydroxide in a molar ratio of 1:1, the materials are continuously put into the ball milling rotary furnace under the condition of nitrogen protection. For 4 hours, when the temperature in the high-temperature zone is controlled at 400-800 degrees, keep warm for 1-4 hours at a rotation speed of 1 revolution / minute, and then cool at room temperature. The product lithium ferrous phosphate is obtained through milling, testing and packaging. In the electrochemical test process, conductive carbon black and binder are added to make pole pieces, and metal lithium sheets are used as counter electrodes for electrochemical tests. The tap density of the material prepared in this embodiment is greater than 1.3g / cm 3 , the electrochemical discharge gram capacity of the electrode material is greater than 150mAh / g, such as image 3 shown.

specific Embodiment 2

[0026] Thoroughly mix iron oxide, ammonium dihydrogen phosphate and lithium carbonate or lithium hydroxide in a molar ratio of 1:1:1, then add conductive carbon black and mix, and then continuously enter the ball milling rotary furnace under the condition of nitrogen protection, the low-temperature synthesis process In the middle, the temperature is controlled at 200-400 degrees, and the temperature is kept for 1-4 hours. When the temperature in the high-temperature zone is controlled at 400-800 degrees, the temperature is kept for 1-4 hours, and the rotation speed is 1 revolution / minute, and then cooled at room temperature. The product lithium ferrous phosphate is obtained through milling, testing and packaging. In the process of electrochemical test, conductive agent and binder are added to make pole piece, and metal lithium piece is used as the test counter electrode. The tap density of the material prepared in this embodiment is greater than 1.2g / cm 3 , The electrochemica...

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Abstract

The invention discloses a method of producing electrochemical active material, comprising the steps of material grinding, mixing, synthesizing and circulating by a ball-milling rotary furnace. The tube of the ball-milling rotary furnace is internally provided with at least one ball-milling heating area with ball-milling material. The invention shortens the proceccing and reacting time, consumes less energy, ensures the excellent performance of the produced product, can adopt the carbon-freeel ectrochemical active material producing process, improves the purity of the electrochemical active material, reduces the emission of the carbon dioxide and is good for environment protection.

Description

technical field [0001] The present invention relates to a method for the manufacture of electrochemically active materials Background technique [0002] Electrode materials with electrochemical activity can be used in the production and manufacture of batteries. Among them, the positive electrode materials of lithium ion batteries include lithium cobalt oxide, lithium nickel oxide, spinel lithium manganate, and ternary lithium nickel manganese cobalt oxide. Among them, LiCoO 2 It is widely used in small lithium-ion batteries. Due to the use of cobalt, it is expensive and unstable under high current and overcharge conditions, so it is very unsafe; LiNiO 2 The crystal structure of LiMn is less stable and safe, and LiMn 2 o 4 The cycle performance is poor, especially under high temperature conditions. The above positive electrode materials are all layered or spinel metal oxides. They are prone to oxygen evolution reaction and unsafe under high temperature charging state, so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/45H01M4/58
CPCY02E60/12Y02E60/10
Inventor 董明苏振华尤志宏
Owner 赛福能源科技(徐州)有限公司
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