Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing anode active substance, anode active substance, anode and battery

A positive electrode active material and a positive electrode technology, which are applied in the field of the method and the positive electrode active material prepared by the preparation method, can solve the problems of low electronic conductivity, poor cycle performance, and low specific capacity of the battery

Active Publication Date: 2013-04-10
BYD CO LTD
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to overcome the defects of the existing positive electrode active material, such as the low electronic conductivity, the low mass specific capacity and poor cycle performance of the battery made of the positive electrode active material, and provide a method that can effectively improve the obtained The electronic conductivity of the positive electrode active material, the preparation method of the positive electrode active material which can improve the mass specific capacity and cycle performance of the battery, the positive electrode active material prepared by the preparation method, the positive electrode comprising the positive electrode active material and the positive electrode comprising the positive electrode battery

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing anode active substance, anode active substance, anode and battery
  • Method for preparing anode active substance, anode active substance, anode and battery
  • Method for preparing anode active substance, anode active substance, anode and battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The invention provides a method for preparing a positive electrode active material, wherein the preparation method comprises sintering a mixture, the mixture contains raw material 1 and raw material 2, and the raw material 1 is the general formula Li x M' y (XO 4 ) z 、LiM’XO 5 、LiM’XO 6 、LiM'X 2 o 7 One or more of the compounds represented, 0a m b N c o d One or several of the compounds represented, A, M, and N are different in pairs, and each is a metal element of Group IIA, IIIA, IVA, VA, IB, IIB, IIIB, IVB, VB, VIB, VIIB or VIII, 0 ≤a≤6, 0≤b≤6, 0<c≤6, 0<d≤12, and a and b are not 0 at the same time.

[0020] The sintered product of raw material 1 and raw material 2 of the present invention is a mixed crystal, and the mixed crystal refers to a mixed crystal formed by sintering two or more compounds, and the two or more compounds are not in contact with each other. There is no chemical reaction, but it has a significantly improved electronic conductivity. The ...

Embodiment 1

[0053] MnCO 3 、TiO 2 , Nb 2 o 5 Mix at a molar ratio of 1:1:1, ball mill for 5 hours, 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 .

[0054] LiFePO 4 and the MnTiNb prepared above 2 o 8 Mix uniformly according to the molar ratio of 1:0.04, then add starch as a carbon source in an amount of 5% by weight according to the content of carbon in the positive electrode active material generated, ball mill for 10 hours, and mix uniformly; Drying, then heating the dried powder to 600°C at a heating rate of 10°C / min in an argon atmosphere, and sintering at a constant temperature for 20 hours to obtain the positive electrode active material LiFePO 4 / MnTiNb 2 o 8 / C mi...

Embodiment 2

[0057] ZnO, Ta 2 o 5 Mix at a molar ratio of 1:1, ball mill for 5 hours, and 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 .

[0058] 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.

[0059] The XRD diffraction pattern of this positive electrode active material measured by the D / MAX-2200 / PC type X-ray powder diffractometer of Rigak...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
electrical conductivityaaaaaaaaaa
electrical conductivityaaaaaaaaaa
electrical conductivityaaaaaaaaaa
Login to View More

Abstract

The invention provides a method for preparing an anode active substance, the anode active substance prepared by the method, an anode comprising the anode active substance and a battery comprising the anode. The method for preparing the anode active substance comprises the step of sintering a mixture which comprises a raw material 1 and a raw material 2; the raw material 1 is one or more of compounds represented by general formulas: LixM'y(XO4)z, LiM'XO5, LiM'XO6 and LiM'X2O7, wherein x / z is more than 0 and less than or equal to 1, y / z is more than 0 and less than or equal to 1.1, M' is one ormore of Na, Mn, Fe, Co, Ni, Ti, V, Y, Mg, Ca and Zn, and X is P, S, As, Mo or W; and the raw material 2 is one or more of compounds represented by a general formula: AaMbNcOd, wherein A, M, and N aredifferent from one another, and are IIA, IIIA, IVA, VA, IB, IIB, IIIB, IVB, VB, VIB, VIIB or VIII group metallic elements respectively, and a and b are not simultaneously 0. The anode active substance prepared by the method can obviously improve the specific capacity of quality and cycle performance of the battery.

Description

technical field [0001] The present invention relates to a preparation method of a positive electrode active material, a positive electrode active material prepared by the preparation method, a positive electrode comprising the positive electrode active material and a battery comprising the positive electrode, in particular to a positive electrode activity of a lithium secondary battery The preparation method of the material, the positive electrode active material prepared by the preparation method, the positive electrode including the positive electrode active material and the battery including the positive electrode. Background technique [0002] Lithium secondary batteries have become an ideal power source for portable electronic products due to their high specific energy, low self-discharge, long cycle life, light weight, and environmental friendliness, as well as the preferred power source for future electric vehicles and hybrid electric vehicles. Therefore, lithium seco...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/36H01M4/02H01M10/36
CPCY02E60/12Y02E60/10
Inventor 田野程堂利席小兵
Owner BYD CO LTD