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Chemical compound batteries with embedded lithium ferrate-lithium

A technology of intercalation compound, lithium ferrate, applied in the synthesis of lithium ferrate cathode material for lithium ion battery, lithium ferrate-lithium intercalation compound battery field, can solve problems such as instability and difficulty, and achieve high specific energy and price. Low, uncomplicated equipment requirements

Inactive Publication Date: 2003-05-07
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For lithium ferrate, due to its instability in aqueous solution, it is difficult to obtain directly by hypochlorite oxidation and electrolysis.

Method used

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  • Chemical compound batteries with embedded lithium ferrate-lithium
  • Chemical compound batteries with embedded lithium ferrate-lithium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Accurately Weighing Li by Stoichiometric Ratio 2 O and Fe 2 o 3 After mixing, mechanical ball milling was carried out for 10 hours under the condition that the mass ratio of ball to material was 2.0:1 and the rotational speed was 250rmp / min, so as to obtain a highly active reaction mixture. Then, in an ozone atmosphere, the temperature was kept at 500° C. for 10 hours to obtain the product lithium ferrate, which was analyzed to have a purity of 95% and a particle size of 100 nm.

Embodiment 2

[0026] Accurately Weighing Li by Stoichiometric Ratio 2 O and Fe 2 o 3 After mixing, mechanical ball milling was carried out for 20 hours under the condition that the mass ratio of ball to material was 2.5:1 and the rotational speed was 350rmp / min, so as to obtain a highly active reaction mixture. Then, in an ozone atmosphere, the temperature was kept at 500° C. for 10 hours to obtain the product lithium ferrate, which was analyzed to have a purity of 97% and a particle size of 70 nm. Fig. 1 is the powder X-ray diffraction diagram of the lithium ferrate obtained in Example 2.

Embodiment 3

[0028] The lithium ferrate product obtained in Example 2 is uniformly mixed with acetylene black and PTFE in a ratio of 85%: 10%: 5% by weight, isopropanol is used as a dispersant, and roll molding is performed to obtain a positive pole piece with a thickness of 0.12mm. With 3 times the C of the positive electrode capacity 6 Li is assembled into a lithium ferrate-lithium intercalation compound battery as the negative electrode. The electrolyte solution is 1MLiPF 6 solution (solvent is EC:DME=1:1v / v), and the diaphragm is polypropylene microporous membrane ( cellgard2300 ). The test was carried out with a constant current of 0.2C, a cut-off voltage of 1.0V, and a positive electrode discharge capacity of nearly 270mAh / g. The discharge curve is shown in Figure 2, and Figure 2 is LiFeO 4 / Li battery discharge curve.

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Abstract

The invention relates to the method for manufacturing the secondary battery, especially, for composing lithium ferrate used as the material of positive electrode in the lithium ion battery. The admixture of the lithium oxide and the oxide of iron or nitrate being as the initiator are put in the ball mill throug hthe mechanical ball milling so as to obtain the lithium ferrate with purity 85%-99%, the grain size 30 nano to 100 micros. The mechanical ball milling condition is as following: the mass ratio between the balls and the materials 1.5:1-2.5:1, the rotation speed 200-400 rmp / min, the time 10-50 hours, then keeping the constant temp 5-20 hours in 400 deg.C-800 deg.C under oxygen atmosphere. The invention features simple technical procedures and equipment, the high purity.

Description

Technical field [0001] The invention relates to the manufacture of a secondary battery, in particular to a lithium ferrate-lithium intercalation compound battery, including a method for synthesizing lithium ferrate as a cathode material for the lithium ion battery. Background technique [0002] In recent years, the rapid development of electronic and information products not only requires chemical power sources to be small in size, but also requires high specific energy, good storage performance, high voltage accuracy and long life. It is estimated that by 2003, there will be more than 600 million mobile phones and 30 million notebook computers in the world. Although metal hydride batteries are developing rapidly, the capacity of AA-type metal hydride batteries can reach 1400-1500mAh, and 4 / 3A can reach 4500mAh, but the working voltage of metal hydride batteries is 1.2V, which is 1 / 3 of the working voltage of lithium-ion batteries , Lithium-ion batteries have a clear advant...

Claims

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Application Information

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IPC IPC(8): C01D15/00C01G49/00H01M4/58H01M10/0525
CPCY02E60/122H01M10/38H01M4/525H01M4/131Y02E60/10Y02P70/50
Inventor 叶世海吴锋高学平王永龙周宁宋德瑛
Owner NANKAI UNIV
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