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A precursor of a hollow positive electrode material with controllable crystal plane and its preparation method

A technology of cathode materials and precursors, applied in the field of precursors of hollow cathode materials and its preparation, can solve the problems of product output performance to be improved, high proportion of crystal planes, poor crystallinity of crystal planes, etc., and achieve primary particle uniformity Good, high crystallinity, narrow diameter effect

Active Publication Date: 2022-03-22
JINCHI ENERGY MATERIALS CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects of poor crystallinity of (100) and (101) crystal planes, high proportion of (001) crystal planes, or product output performance still to be improved in the existing hollow material precursor technology , and provide a precursor of a hollow positive electrode material with a high proportion of (100) and (101) crystal planes and a preparation method thereof

Method used

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  • A precursor of a hollow positive electrode material with controllable crystal plane and its preparation method
  • A precursor of a hollow positive electrode material with controllable crystal plane and its preparation method
  • A precursor of a hollow positive electrode material with controllable crystal plane and its preparation method

Examples

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Embodiment 1

[0047] Prepare a ternary metal salt solution of nickel sulfate, cobalt sulfate, and manganese sulfate with a total metal concentration of 2mol / L according to the molar ratio of nickel, cobalt, and manganese of 60:20:20, and prepare a 2mol / L sodium hydroxide solution. Add pure water to a reactor with a volume of 100L, control the temperature at 55°C, add ammonia water to adjust the concentration of ammonia water in the reactor to 12g / L, add lye to adjust the pH to 11.70, and adjust the stirring speed of the reactor to 4.37m / s, and continuously feed nitrogen into the reactor, inject the ternary metal salt solution into the reactor with a flow rate of 0.1L / min for reaction, inject lye and ammonia water at the same time to maintain the pH and the concentration of ammonia water constant, and carry out the formation process. nuclear reaction;

[0048] After 90 minutes of nucleation reaction, the co-precipitation reaction stage was entered, and the pH was lowered to 11.40 at a rate ...

Embodiment 2

[0051] Prepare a ternary metal salt solution of nickel sulfate, cobalt sulfate, and manganese sulfate with a total metal concentration of 2mol / L according to the molar ratio of nickel, cobalt, and manganese of 50:20:30, and prepare a 2mol / L sodium hydroxide solution. Add pure water to the reactor with a volume of 100L, control the temperature at 55°C, add ammonia water to adjust the ammonia concentration in the reactor to 15g / L, add lye to adjust the pH to 11.80, and adjust the reactor speed to 5.47m / s , and continuously feed nitrogen into the reactor, inject ternary metal salt solution into the reactor at a flow rate of 0.12L / h, inject lye and ammonia water at the same time to maintain the constant pH and ammonia concentration, and carry out nucleation reaction;

[0052] After 90 minutes of nucleation reaction, the co-precipitation reaction stage was entered, and the pH was lowered to 11.20 at a rate of 0.05 every 3 hours. After a total reaction time of 3 hours, the flow rate...

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Abstract

The present invention provides a precursor of a hollow cathode material with controllable crystal plane, whose XRD diffraction intensity satisfies 0.6≤I(100) / I(001)≤1.0, 0.9≤I(101) / I(001)≤1.4, and the second The particles have a core-external wall structure, the density of the outer wall is higher than that of the inner core, and the diameter of the inner core is 40-70% of the diameter of the secondary particle. A method for preparing the precursor is also provided. By controlling the degree of oxidation of the precursor within a specific range during the growth of the precursor, the growth priority of the crystal plane of the precursor is changed, and the (100) and ( 101) The proportion of crystal planes can be increased, and at the same time, the precursor of the desired morphology can be obtained by adjusting the supply amount and pH of the metal salt during the reaction process, so as to obtain the hollow material precursor with controllable crystal planes. The precursor of the invention has excellent cycle performance and output characteristics, and has broad application prospects in the field of power batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and in particular relates to a precursor of a hollow positive electrode material with controllable crystal planes and a preparation method thereof. Background technique [0002] Out of environmental protection, my country, Europe and other places have successively introduced strict emission standards, and traditional fuel vehicles are gradually being replaced by new energy vehicles equipped with lithium-ion batteries. With the continuous improvement of the market share of new energy vehicles and the entry of high-end models into the market, car companies not only require new energy vehicles to have a longer cruising range, but also put forward higher requirements for charging time and vehicle acceleration response. Lithium-ion batteries are also required to have high power density and rate performance. Compared with lithium iron phosphate, the layered structure of ternary m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525C01G53/00
CPCC01G53/006H01M4/505H01M4/525H01M10/0525H01M2004/028H01M2004/021C01P2002/72C01P2004/50C01P2004/61C01P2006/12C01P2004/03Y02E60/10
Inventor 胡海诗刘凯胡志兵张海艳李玉云苏帅
Owner JINCHI ENERGY MATERIALS CO LTD