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Positive pole active substance, positive pole and battery

A positive electrode active material, a positive electrode technology, applied in the field of positive electrodes and batteries including the positive electrode, can solve the problems of low electronic conductivity, poor cycle performance, low battery mass specific capacity, etc.

Active Publication Date: 2009-07-08
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to overcome the disadvantages of the existing positive electrode active material, such as low electronic conductivity, low mass specific capacity and poor cycle performance of the battery made of the positive electrode active material, and provide a battery with high electronic conductivity. The positive electrode active material and the positive electrode comprising the positive electrode active material and the battery comprising the positive electrode, the positive electrode active material can significantly improve the mass specific capacity and cycle performance of the battery

Method used

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  • Positive pole active substance, positive pole and battery
  • Positive pole active substance, positive pole and battery
  • Positive pole active substance, positive pole and battery

Examples

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preparation example Construction

[0042] The preparation method of the positive electrode can adopt various methods commonly used in the art, for example, a positive electrode active material, a binder and a conductive agent optionally contained are prepared into a positive electrode slurry with a solvent, and then the prepared positive electrode slurry is drawn The slurry is coated on the positive electrode current collector, dried and pressed, and then cut into pieces to obtain the positive electrode. The drying temperature may be 100-150° C., and the drying time may be 2-10 hours.

[0043] The solvent used in the positive electrode slurry can be various solvents used in the prior art, such as can be selected from N-methylpyrrolidone (NMP), dimethylformamide (DMF), diethylformamide (DEF) , dimethyl sulfoxide (DMSO), tetrahydrofuran (THF), and one or more of water and alcohols. The amount of the solvent added is well known to those skilled in the art, and can be flexibly adjusted according to the viscosity a...

Embodiment 1

[0055] MnCO 3 、TiO 2 , Nb 2 o 5Mix at a molar ratio of 1:1:1, ball mill for 5 hours, and heat up to 500°C at 10°C / min and bake for 10 hours under a nitrogen atmosphere to obtain a sintered product. The XRD diffraction pattern of this sintered product measured by the D / MAX-2200 / PC type X-ray powder diffractometer of Rigaku Company, and MnTiNb 2 o 8 Compared with the standard spectrum, it is confirmed that the sintered product is MnTiNb 2 o 8 .

[0056] LiFePO 4 and the MnTiNb prepared above 2 o 8 Mix evenly according to the molar ratio of 1:0.04, then add starch as a carbon source according to the content of carbon in the positive electrode active material generated as 5% by weight, ball mill for 10 hours, and mix evenly; After drying, the dried powder was heated up to 600°C at a rate of 10°C / min in an argon atmosphere, and then sintered at a constant temperature for 20 hours to obtain the positive electrode active material LiFePO 4 / MnTiNb 2 o 8 / C mixed crystals....

Embodiment 2

[0059] ZnO, Ta 2 o 5 Mix at a molar ratio of 1:1, ball mill for 5 hours, heat up to 800°C at 15°C / min and bake for 8 hours in an air atmosphere to obtain a sintered product. The XRD diffraction pattern of this sintered product measured by the D / MAX-2200 / PC type X-ray powder diffractometer of Rigaku Company, and ZnTa 2 o 6 Compared with the standard spectrum, it is confirmed that the sintered product is ZnTa 2 o 6 .

[0060] LiFePO 4 and ZnTa prepared above 2 o 6 Mix evenly according to the molar ratio of 1:0.03, ball mill for 10 hours, mix evenly; dry the ball-milled mixture at 80°C, and then heat the dried powder at a heating rate of 5°C / min under an argon atmosphere To 500 ° C, sintering at a constant temperature for 30 hours to obtain the positive electrode active material LiFePO 4 / ZnTa 2 o 6 mixed crystals.

[0061] The XRD diffraction pattern of this positive electrode active material measured by the D / MAX-2200 / PC type X-ray powder diffractometer of Rigaku co...

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Abstract

The invention provides a positive electrode active substance, a positive electrode containing the positive electrode active substance and a battery including the positive electrode. The positive electrode active substance contains a crystal mixture including a first crystal and a second crystal, wherein the first crystal is selected from one or more of compounds represented by LixM'y (XO4) z, LiM'XO5, LiM'XO 6, and LiM'X2O7, where the ratio of x to z is larger than 0 and not larger than 1, the ratio of y to z is larger than 0 and not larger than 1.1, and M' is one or more selected from Na, Mn, Fe, Co, Ni, Ti, V, Y, Mg, Ca and Zn, and X is P, S, As, Mo or W; and the second crystal is selected from one or more of compounds represented by AaMbNcOd, where A, M and N are different from each others and are respectively metal elements of group IIA, IIIA, IVA, VA, IB, IIB, IIIB, IVB, VB, VIB, VIIB and VIII, a and b are not less than 0 and not larger than 6, c is larger than 0 and not larger than 6, d is larger than 0 and not less than 12, and the summation of a and b is not equal to zero. The positive electrode active substance has an electron conductivity of 0.01 to 10 S / cm at 25 DEG C, and can remarkably improve the specific discharge capacity and the cycle performance of the battery.

Description

technical field [0001] The present invention relates to a positive electrode active material, a positive electrode comprising the positive electrode active material and a battery comprising the positive electrode, in particular to a positive electrode active material of a lithium secondary battery, a positive electrode comprising the positive electrode active material and a battery comprising the positive electrode Battery. Background technique [0002] Lithium secondary battery has become an ideal power source for portable electronic products due to its advantages of large specific capacity, small self-discharge, long cycle life, light weight and environmental friendliness, and is also the preferred power source for future electric vehicles and hybrid electric vehicles. Therefore, lithium secondary batteries and related materials have become one of the research hotspots of researchers all over the world. Among them, the positive electrode active material has become a bottl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/02H01M10/36
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 田野程堂利席小兵
Owner BYD CO LTD
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