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Synthesizing method for lithium ion anode material LiFePO4/C

A technology of positive electrode materials and synthesis methods, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve problems such as the adverse effects of LiFePO4 electrical properties, and achieve the effect of improving electrical properties and avoiding agglomeration

Active Publication Date: 2014-06-04
XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, Fe 2+ easily oxidized to Fe 3+ Impurities, for LiFePO 4 have an adverse effect on the electrical properties of the

Method used

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  • Synthesizing method for lithium ion anode material LiFePO4/C
  • Synthesizing method for lithium ion anode material LiFePO4/C
  • Synthesizing method for lithium ion anode material LiFePO4/C

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 5.0mol Fe 2 o 3 , 0.05mol MnO 2 , 0.05mol TiO 2 and 100g of glucose, mixed with 2.5L of anhydrous salt water, ball milled for 8 hours, spray granulated, and the obtained powder was pretreated at 500°C for 7 hours in an inert atmosphere to obtain a carbon-coated iron source powder. Dissolve 10.0mol of ammonium dihydrogen phosphate in 2.5L of anhydrous brine, add carbon-coated iron source powder, and then slowly add 10.0mol of LiOH·H 2 O, stir evenly, ball mill for 3 hours, and spray granulate to obtain dry powder. The powder was added into the rotary kiln, under N 2 Sinter at 650°C for 8 hours in the atmosphere, then heat up to 800°C and sinter for 20 hours, then cool, sieve, classify and obtain the product.

[0023] The resulting product had a carbon content of 2.1%.

[0024] The material is proportioned LiFePO 4 : SP: KS6: HSV900: NMP = 92.5: 2: 1: 4.5: 100 ratio preparation to make 18650 cylindrical battery. The battery test 1C discharge capacity is 135.5mAh / g...

Embodiment 2

[0027] 5.0mol Fe 2 o 3 , 0.05mol MnO 2 , 0.05mol MgO and 100g sucrose, add 3.0L anhydrous salt water and mix evenly, ball mill for 8 hours, spray granulate, and the obtained powder is pretreated at 500°C for 8 hours in an inert atmosphere to obtain carbon-coated iron source powder. Dissolve 10.0mol of ammonium dihydrogen phosphate in 2.5L of anhydrous brine, add carbon-coated iron source powder, and then slowly add 10.0mol of LiOH·H 2 O, stir evenly, ball mill for 3 hours, and spray granulate to obtain dry powder. The powder was added into the rotary kiln, under N 2 Sinter at 600°C for 8h in the atmosphere, then heat up to 800°C for 20h, cool, sieve, classify by air flow and obtain the product.

[0028] The resulting product had a carbon content of 1.9%.

[0029] The material is proportioned LiFePO 4: SP: KS6: HSV900: NMP = 92.5: 2: 1: 4.5: 100 ratio preparation to make 18650 cylindrical battery. The battery test 1C discharge capacity is 132.3mAh / g.

Embodiment 3

[0031] 5.0mol Fe 2 o 3 , 0.1mol MnO 2 and 100g of polyethylene glycol, mixed with 2.5L of anhydrous salt water, ball milled for 8h, spray granulated, and the obtained powder was pretreated at 500°C for 8h in an inert atmosphere to obtain a carbon-coated iron source powder. Dissolve 10.0mol ammonium dihydrogen phosphate in 2.5L anhydrous salt water, add carbon-coated iron source powder, and then slowly add 10.0mol LiOH·H 2 O, stir evenly, ball mill for 3 hours, and spray granulate to obtain dry powder. The powder was added into the rotary kiln, under N 2 Sinter at 650°C for 8 hours in the atmosphere, then heat up to 820°C for 15 hours, then cool, sieve, classify and obtain the product.

[0032] The resulting product had a carbon content of 1.8%.

[0033] The material is proportioned LiFePO 4 : SP: KS6: HSV900: NMP = 92.5: 2: 1: 4.5: 100 ratio preparation to make 18650 cylindrical battery. The battery test 1C discharge capacity is 130.9mAh / g.

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Abstract

The invention provides a synthesizing method for a lithium ion anode material LiFePO4 / C and relates to lithium ion battery anode materials. The synthesizing method comprises the following steps: (1) adding water into iron sesquioxide, a doped metal ion oxide and an organic carbon source and mixing; carrying out ball milling and spraying and granulating to prepare powder; pre-treating the obtained powder in an inert atmosphere to obtain carbon coated iron source powder; (2) dissolving a phosphorus source into the water and adding the carbon coated iron source powder obtained by the step (1); adding lithium hydroxide; carrying out the ball milling and spraying and granulating to prepare dry powder; and (3) treating the dry powder obtained by the step (2) into the inert atmosphere to be treated, and carrying out high-temperature heat treatment; and carrying out air flow grading to obtain the lithium ion anode material LiFePO4 / C. According to the synthesizing method, the surfaces of the LiFePO4 / C are coated with carbon and doped ions are introduced into a LiFePO4 / C structure to change the semiconductor property and improve the electronic conductivity; the grain diameter of a LiFePO4 / C crystal is reduced so that the diffusion speed of the lithium ions in a charging and discharging process is improved.

Description

technical field [0001] The invention relates to lithium-ion battery positive electrode materials, in particular to LiFePO, a lithium-ion positive electrode material that adopts a carbon-coated ferric oxide process. 4 / C synthesis method. Background technique [0002] Since Googenough discovered LiFePO with olivine structure in 1997 4 For a long time, due to its abundant raw materials, low price, and environmental friendliness, it has the advantages of good thermal stability, excellent cycle performance, and high safety when used as a cathode material. However, due to the characteristics of its own composition and structure, its intrinsic electronic conductivity is low, and the diffusion rate of lithium ions in the charge and discharge process is low. These shortcomings limit its high current charge and discharge capability. Therefore, there is a need to improve LiFePO 4 The electronic conductivity increases the diffusion rate of lithium ions during the charging process. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/1397H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 王耀南张文新章明陈惠明
Owner XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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