Positive pole active substance containing lithium iron phosphate, preparation, positive pole and battery thereof

A cathode active material, lithium iron phosphate technology, applied to cathode active material containing lithium iron phosphate and its preparation and cathode and battery fields, can solve problems such as low specific capacity and capacity retention rate, and avoid tap density The effect of reducing, specific capacity per unit mass and high capacity retention rate

Inactive Publication Date: 2009-06-10
海宁市盐官工业投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the specific capacity per unit mass and low capacity retention of the positive electrode active material containing lithium iron phosphate doped with carbon in the prior art, and to provide a speci

Method used

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  • Positive pole active substance containing lithium iron phosphate, preparation, positive pole and battery thereof
  • Positive pole active substance containing lithium iron phosphate, preparation, positive pole and battery thereof
  • Positive pole active substance containing lithium iron phosphate, preparation, positive pole and battery thereof

Examples

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Example Embodiment

[0041] Example 1

[0042] This example is used to illustrate the positive electrode active material containing lithium iron phosphate and the preparation method thereof of the present invention.

[0043] Weigh 5 moles of lithium carbonate, 10 moles of ferrous oxalate, 0.4 moles of iron powder with an average particle diameter of 40 nanometers, 10.2 moles of ammonium dihydrogen phosphate, and 1.5 moles of glucose and add them to the ball mill jar, and use 4 kg of acetone as a dispersion Add the agent into the ball mill tank, and ball mill for 10 hours to obtain a uniform mixture; move the mixture into a centrifuge for separation, collect the separated acetone for recycling; put the filter cake in the separator into a tray, and move it into nitrogen Pre-sintering and sintering are carried out in a protected high-temperature kiln. The heating rate is 5°C / min. The cooling rate drops to room temperature and then leaves the kiln. Afterwards, jet milling is carried out until the ma...

Example Embodiment

[0044] Example 2

[0045] This example is used to illustrate the positive electrode active material containing lithium iron phosphate and the preparation method thereof of the present invention.

[0046] According to the method described in Example 1, the positive electrode active material containing lithium ferrous phosphate is prepared, the difference is that the amount of lithium carbonate is 5 moles, the amount of ferrous oxalate is 10 moles, and the amount of nano-iron powder is 0.3 moles, which The average particle diameter was 10 nm, the amount of ammonium dihydrogen phosphate was 10.15 moles and the amount of glucose was 1.5 moles.

Example Embodiment

[0047] Example 3

[0048] This example is used to illustrate the positive electrode active material containing lithium iron phosphate and the preparation method thereof of the present invention.

[0049] According to the method described in Example 1, a positive electrode active material containing lithium ferrous phosphate was prepared, except that 1.5 moles of glucose were replaced with 0.5 moles of sucrose, 5 moles of lithium carbonate were replaced with 10 moles of lithium acetate, and the amount of ferrous oxalate was 10 Moore.

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Abstract

The invention provides an anode active substance containing lithium iron phosphate. The anode active substance contains lithium iron phosphate particles and nanometer carbon, wherein the anode active substance also contains ferrous phosphide. The invention also provides a method for preparing the anode active substance containing the lithium iron phosphate; the preparation method comprises: under the environment of inert gas, a mixture is pre-sintered for 6 to 10 hours at a temperature of between 400 and 500 DEG C and is sintered for 8 to 30 hours at a temperature of between 650 and 850 DEG C; and the mixture contains a lithium source compound, a ferrous compound, an organic carbon source and a phosphor source, wherein the mixture also contains nanometer iron powder. The invention also provides an anode and a cell containing the anode active substance. The ferrous phosphide in the anode active substance containing the lithium iron phosphate has larger density than carbon so as to effectively avoid the reduction of tap density of the electrode material caused by the addition of the carbon source, and make unit mass specific capacity and capacity retention rate of the anode active substance high.

Description

technical field [0001] The invention relates to a positive electrode active material containing lithium iron phosphate and a preparation method thereof, as well as a positive electrode and a battery containing the positive electrode active material. Background technique [0002] Iron-based compounds have the characteristics of low price, non-toxicity, non-hygroscopicity, environmental friendliness, abundant reserves, long cycle life and cycle stability. Lithium iron phosphate (LiFePO) with regular olivine type 4 ) can produce 3.4V (Li / Li + ) voltage, LiFePO 4 The charge-discharge reaction is in LiFePO 4 and FePO 4 Between the two phases, the lattice volume changes little and the structure is stable. In LiFePO 4 oxidized to iron phosphate (FePO 4 ), its volume is reduced by 6.81%, and the volume shrinkage during charging can make up for the expansion of the carbon negative electrode, which helps to improve the volume utilization efficiency of lithium-ion batteries. ...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/48H01M4/36H01M4/04C01B25/45H01M4/02H01M10/40H01M4/136H01M10/0525H01M10/36
CPCY02E60/122H01M4/5825H01M4/625H01M10/0525H01M2004/021H01M4/136Y02E60/10
Inventor 曹文玉张水源刘南江姜占锋
Owner 海宁市盐官工业投资有限公司
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