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Positive electrode material and lithium battery comprising same

A cathode material, lithium battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of insignificant improvement in charge and discharge performance, poor battery rate performance, uneven pore size, etc., and achieve poor charge and discharge performance. Good charge and discharge performance, the effect of improving technical problems

Pending Publication Date: 2022-02-25
ZHUHAI COSMX POWER CO LTD
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Problems solved by technology

For example, the prior art discloses a method for hydrothermally synthesizing nano-lithium iron phosphate, but this method is prone to dislocation of Fe structure when synthesizing the olivine structure, thereby affecting its electrochemical performance, and improving the charge and discharge performance at low temperatures and not obvious
In addition, the method of metal ion doping cannot solve the problem of slow lithium ion migration rate, so the battery polarization phenomenon is still serious; the amorphous carbon pore size of the carbon-coated lithium iron phosphate material is uneven, resulting in high current density. The rate performance of the lower battery is still poor

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  • Positive electrode material and lithium battery comprising same

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preparation example Construction

[0029] The present invention also provides a preparation method for the above positive electrode material, the preparation method comprising: using a semiconductor material with a negative temperature coefficient and lithium iron phosphate as raw materials, mixing them to obtain a lithium iron phosphate precursor coated with a semiconductor material with a negative temperature coefficient, Then, the positive electrode material is prepared by high-temperature sintering.

[0030] According to an embodiment of the present invention, in the lithium iron phosphate precursor coated with a semiconductor material with a negative temperature coefficient, the mass of the semiconductor material with a negative temperature coefficient accounts for 1 to 10wt% of the total mass, exemplarily 1wt%, 2wt% %, 5wt%, 8wt%, 10wt%.

[0031] According to an embodiment of the present invention, in the lithium iron phosphate precursor coated with a semiconductor material with a negative temperature coe...

Embodiment approach

[0047] According to an embodiment of the present invention, the preparation method of the positive electrode material includes the following steps:

[0048] (1) Preparation of negative temperature coefficient semiconductor material dispersion: add negative temperature coefficient semiconductor material into the solvent, ultrasonically stir, then add dispersant to the solution, and continue ultrasonication for 20 to 90 minutes to complete the dissolution or dispersion of the solute and form Suspended stable negative temperature coefficient semiconductor material dispersion;

[0049] (2) Preparation of lithium iron phosphate material dispersion: add lithium iron phosphate raw material into the solvent, ultrasonically shear and stir, then add dispersant to the solution, and continue ultrasonication for 60-180min to disperse lithium iron phosphate and form a stable Lithium iron phosphate dispersion;

[0050] (3) Add the lithium iron phosphate dispersion obtained in step (2) to th...

Embodiment 1

[0062] A method for preparing a low-temperature type lithium iron phosphate material, comprising the steps of:

[0063] a. Preparation of negative temperature coefficient semiconductor material dispersion: 0.002mol LaMn 0.5 TiO 3 Add the negative temperature coefficient semiconductor raw material into 200g deionized water, ultrasonically stir for 30 minutes, fully wet, then add 0.00015g polyvinylpyrrolidone dispersant to the solution, and continue ultrasonication for 50min, so that the solute is completely dissolved or dispersed, forming a stable suspension Negative temperature coefficient semiconductor material dispersion;

[0064] b. Preparation of lithium iron phosphate material dispersion: add 10g of lithium iron phosphate raw material with an average particle size D50 of 500nm to 100g of N-methylpyrrolidone, ultrasonically shear and stir for 60min, fully wet, and then add 0.002 g oleic acid dispersant, and continue ultrasonication for 120 minutes to completely disperse ...

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Abstract

The invention discloses a positive electrode material and the lithium battery comprising the positive electrode material, a lithium iron phosphate positive electrode material is subjected to liquid-state coating by adopting a semiconductor material with a negative temperature coefficient, and then high-temperature sintering is performed, so that the surface of lithium iron phosphate is uniformly coated with a layer of semiconductor material with the negative temperature coefficient; therefore, the positive electrode material with excellent discharge performance at low temperature is prepared. Under the low-temperature condition, the positive electrode material has very large impedance, the positive electrode plate is equivalent to a heating resistor, and after the positive electrode plate is electrified, the electrode plate can quickly release heat so as to heat the battery. And when the temperature of the battery rises, the impedance of the pole piece is also reduced, and the activity of the material is also recovered to the normal temperature level, so that more energy can be released, and safety accidents caused by lithium precipitation of a negative electrode at low temperature are further avoided.

Description

technical field [0001] The present invention relates to the technical field of lithium batteries, to a positive electrode material and a lithium battery including the material, in particular to a low-temperature lithium iron phosphate material and its preparation method and application, and in particular to a battery with good low-temperature charge-discharge performance Lithium iron phosphate cathode material and its preparation method and application. Background technique [0002] In recent years, with the strong support of national policies, the popularity of electric vehicles has become higher and higher, which has also brought about the rapid development of batteries. In the field of batteries, lithium-ion power batteries have been widely used in industrial applications because of their advantages such as high energy density, long cycle life, small self-discharge and no memory effect, especially in new energy vehicles. The currently widely used cathode materials for li...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/58H01M4/62H01M10/0525
CPCH01M4/5825H01M4/136H01M4/623H01M4/625H01M10/0525Y02E60/10
Inventor 李振凡小磊王美丽靳玲玲
Owner ZHUHAI COSMX POWER CO LTD
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