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Core-shell structure precursor for lithium ion layered positive electrode material and preparation method of core-shell structure precursor

A core-shell structure and positive electrode material technology, applied in structural parts, chemical instruments and methods, battery electrodes, etc., can solve the problem of low fault tolerance rate, achieve the effect of simple parameters, controllable production capacity, and prevent cracks

Active Publication Date: 2020-02-14
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The whole process needs to strictly control the mixing rate and feeding time of at least two metal salt solutions with different concentrations, the operation is too refined and the fault tolerance rate is low

Method used

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  • Core-shell structure precursor for lithium ion layered positive electrode material and preparation method of core-shell structure precursor

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Effect test

Embodiment 1

[0028] A preparation method of a core-shell structure precursor for a lithium-ion layered positive electrode material, specifically comprising the following steps:

[0029] (1), press Ni 0.85 co 0.1 mn 0.05 SO 4 The molar ratio configuration metal sulfate mixed solution, then the metal sulfate mixed solution (the metal ion concentration is 2mol / L, and the feeding flow rate is 30mL / min), lye (4.5mol / L) and ammonia complexing agent solution ( 9mol / L) in the reaction kettle, and reacted for 0.5h under the conditions of controlling the ammonia concentration in the reaction solution to 10g / L and the pH to 12.5, to obtain the initial precursor seed material;

[0030] (2) Increase the amount of ammonia complexing agent added to adjust the ammonia concentration of the reaction solution in the reactor to 12g / L, reduce the amount of lye added to adjust the pH to 11.5, and continue the reaction until the precursor seed grows to 93% of the target particle size %, to obtain the core la...

Embodiment 2

[0036] A preparation method of a core-shell structure precursor for a lithium-ion layered positive electrode material, specifically comprising the following steps:

[0037] (1), press Ni 0.83 co 0.10 mn 0.05 Ti 0.02 SO 4 The molar ratio of the metal sulfate mixed solution is configured, and then the metal sulfate mixed solution (the metal ion concentration is 1.6mol / L, and the feeding flow rate is 20mL / min), sodium hydroxide solution (4.2mol / L) and ammonia complexation The reagent solution (7mol / L) was placed in the reaction kettle, and the ammonia concentration in the reaction solution was controlled to be 8.5g / L and the pH was 12.2 to react for 1h to obtain the initial precursor seed material;

[0038] (2) Increase the amount of ammonia complexing agent added to adjust the ammonia concentration of the reaction solution in the reactor to 10.5g / L, reduce the amount of lye added to adjust the pH to 11.3, and continue the reaction until the precursor seed material grows to t...

Embodiment 3

[0043] A preparation method of a core-shell structure precursor for a lithium-ion layered positive electrode material, specifically comprising the following steps:

[0044] (1), press Ni 0.88 co 0.05 mn 0.05 Zr 0.02 SO 4 The molar ratio of the metal sulfate mixed solution is configured, and then the metal sulfate mixed solution (the metal ion concentration is 2.2mol / L, and the feeding flow rate is 20mL / min), sodium hydroxide solution (5mol / L) and ammonia complexing agent solution (11mol / L) was placed in the reaction kettle, and the ammonia concentration in the reaction liquid was controlled to be 11g / L, and the pH was 12.7 to react for 1.5h to obtain the initial precursor seed material;

[0045] (2) Increase the amount of ammonia complexing agent to adjust the ammonia concentration of the reaction solution in the reactor to 13g / L, reduce the amount of lye to adjust the pH to 11.6, and continue the reaction until the precursor seed material grows to 90% of the target partic...

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Abstract

The invention discloses a core-shell structure precursor for a lithium ion layered positive electrode material and a preparation method of the core-shell structure precursor. An inner core compositionof the core-shell structure precursor is NixCoyM(1-x-y)(OH)2, wherein x is more than or equal to 0.80 and less than or equal to 0.95, y is more than or equal to 0.03 and less than or equal to 0.1, the sum of x and y is less than 1, and M is one or a mixture of more of Mn, Al, Zr and Ti; in the core-shell structure precursor, the molar ratio of the nickel content of an inner core layer to the nickel content of an outer shell layer is 1.03-1.15, and the thickness of the outer shell layer accounts for 2-15% of the particle size of the whole core-shell structure precursor. By regulating and controlling the ammonia concentrations and pH values in different stages, the metal mixed salt solution realizes incomplete precipitation of metal ions in different reaction stages, and the element component concentration distribution of the precursor is regulated and controlled to prepare the core-shell structure precursor.

Description

technical field [0001] The invention relates to the technical field of lithium ion positive electrode materials, in particular to a core-shell structure precursor for lithium ion layered positive electrode materials and a preparation method thereof. Background technique [0002] Layered cathode materials with high nickel content Li(Ni x co y m 1-x-y )O 2 (0.80≤x≤0.95, 0.03≤y≤0.1) with Ni 2+ As the content increases, the surface residual alkalinity of the material is higher, the moisture sensitivity of the material is high, and the processing cost is high; secondly, the surface structure of the material is destroyed during the repeated lithium ion deintercalation process, and it is prone to phase transition, from a layered structure to a Form an inactive rock-salt phase (NiO) structure and react with the electrolyte, resulting in deterioration of cycle performance. The main idea to solve such problems is to stabilize the structure by material bulk doping and surface modi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M4/485H01M10/0525
CPCC01G53/006H01M4/505H01M4/525H01M4/485C01P2006/40C01P2006/80H01M10/0525Y02E60/10
Inventor 陈龙夏昕李道聪杨茂萍
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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