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Lithium iron phosphate anode material and its preparing method

A positive electrode material, lithium iron phosphate technology, applied in the direction of electrode manufacturing, chemical instruments and methods, lithium compounds, etc., can solve the problems of low conductivity and tap density of lithium iron phosphate, improve the discharge platform, facilitate industrialization, and discharge good performance effect

Inactive Publication Date: 2006-05-03
河南天科科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a method that can improve the LiFePO 4 Battery anode material with electrical conductivity and tap density and preparation method thereof

Method used

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  • Lithium iron phosphate anode material and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh ferrous oxalate, diammonium hydrogen phosphate and lithium hydroxide according to the mass ratio (4.3:3.1:1) and place them in an agate ball mill jar, add 12 g of ethanol as a lubricant, and ball mill for 36 hours at 175 r / min. Then put the ball-milled mixture into a tube furnace and feed it with argon as an inert protective gas, first raise the temperature to 350°C at room temperature at a rate of 5°C / min and calcinate for 10h, and then at 5°C / min The heating rate is raised to 650 °C and calcined for 24 hours, and finally cooled to room temperature to obtain pure lithium iron phosphate, and its conductivity was measured to be 3.76×10 -7 s cm -1 , the tap density is 0.60g·cm -3 .

[0023] Weigh 2.475g lithium iron phosphate (LiFePO 4 ) and 0.025g calcium boride (CaB 6 ), adding 5g of ethanol as a lubricant, milling at a ball milling speed of 175r / min for 10h, then heating up to 650°C at a heating rate of 5°C / min and calcining for 10h, and cooling to room tempe...

Embodiment 2

[0025] The synthesis method of lithium iron phosphate with 3% calcium boride added is the same as in Example 1, except that the quality of calcium boride is changed to 0.075g, and the product A3 containing 3% calcium boride can be obtained. And conduct conductivity and tap density measurements on A3, the values ​​are 2.15×10 -3 s cm -1 and 0.99g cm -3 . Compared with pure lithium iron phosphate, it can be seen that after adding 3% calcium boride, the electrical conductivity has been improved by 4 orders of magnitude, and the tap density has been improved by 65% ​​(see Table 1 and figure 1 ).

Embodiment 3

[0027] Weigh 0.125g calcium boride and 2.375g lithium iron phosphate, its synthetic method is the same as embodiment 1, finally obtain the lithium iron phosphate product A5 that adds 5% calcium boride, its electrical conductivity and tap density value are respectively 2.80×10 -4 s cm -1 and 0.84g cm -3 . Compared with pure lithium iron phosphate, the conductivity has been improved by 3 orders of magnitude, and the tap density has been improved by 40% (see Table 1 and figure 1 ).

[0028] It can be seen from the above examples that after a comprehensive comparison of the performance of lithium iron phosphate after calcium boride is added, when 1 to 3% calcium boride is added, lithium iron phosphate should have the largest tap density and the highest electrical conductivity, and The material performance is excellent, and the discharge platform is good.

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Abstract

The invention relates to ferric phosphate lithium anode material and its preparing method, which relates to a cell anode material, especially to a ferric phosphate lithium anode material used in lithium ion cell second time. It provides a cell anode material and ití»s preparing method which can elevate the LiFePO4 conductivity and tap density at the same time. It is formed by ferric phosphate lithium and calcium boride (by weight rate): ferric phosphate lithium: calcium boride=100í† (1.01- 5.26). It first syntheses pure ferric phosphate lithium: it balls the ferrous salt, microcosmic salt and lithium salt by alcohol grease, heats the mixed material and uses inactive gas as preserving gas. It balls the synthesis ferric phosphate lithium anode and calcium boride, burns the mixed material and adds inactive gas as preserving gas to obtain the object product.

Description

technical field [0001] The invention relates to a battery cathode material, in particular to a lithium iron phosphate cathode material mainly used in lithium ion secondary batteries. technical background [0002] LiCoO is currently the mainstream cathode material for commercial lithium-ion secondary batteries on the market. 2 , but due to the increasing shortage of cobalt resources, the price of this material has been high, so people have always hoped to find a substitute for LiCoO 2 electrode material. Lithium iron phosphate (LiFePO 4 ) as a new type of cathode material for lithium-ion secondary batteries has attracted great attention recently. The reason is that it has good cycle performance, non-toxicity, environmental friendliness, and cheap advantages, and it is very hopeful that it can replace LiCoO 2 And become the cathode material of the next generation lithium ion secondary battery. But this material itself has two fatal shortcomings: low tap density and low el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/00C01F11/00H01M4/04H01M4/58
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 董全峰刘善科郑明森孙世刚詹亚丁林祖赓
Owner 河南天科科技有限公司
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