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Positive electrode material precursor of lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of unstable structure of positive electrode materials and impact on safety performance, achieve good cycle stability, reduce mixed discharge, and prevent mixed discharge. row effect

Inactive Publication Date: 2016-05-04
JINGMEN GEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when such precursor materials with a core-shell structure in the prior art are used as positive electrode materials for lithium-ion batteries, there is still the problem of outward diffusion of nickel ions in the core during the cycle of the battery, so that the structure of the positive electrode material becomes unstable and security performance suffers

Method used

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  • Positive electrode material precursor of lithium ion battery and preparation method thereof
  • Positive electrode material precursor of lithium ion battery and preparation method thereof
  • Positive electrode material precursor of lithium ion battery and preparation method thereof

Examples

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Embodiment 1

[0059] A preparation method of a lithium ion battery cathode material precursor, comprising the following steps:

[0060] (1) Preparation of the inner core: the molar concentration ratio of nickel sulfate and cobalt sulfate is 9:1 to prepare nickel-cobalt mixed salt solution, wherein the total concentration of nickel and cobalt ions is 1.5mol / L; prepare 18wt% ammonia water, 6mol / L L of sodium hydroxide solution, with ammonia as a complexing agent, NaOH as a precipitating agent. Add the nickel-cobalt mixed salt solution to the reactor at a rate of 120L / h with a metering pump, and add ammonia water to the reactor at a rate of 15L / h for coprecipitation reaction. The reaction temperature is 65°C, the pH value is controlled at 11.0, and the reaction is carried out for 16 hours. Inner core, namely [Ni(OH) 2 ] 0.9 ·[Co(OH) 2 ] 0.1 ;

[0061] (2) Formation of core-shell structure: Prepare aluminum salt complex solution A with aluminum ion concentrations of 0.015mol / L and 0.150mol...

Embodiment 2

[0072] A preparation method of a lithium-ion battery cathode material precursor with a core-shell structure, comprising the following steps:

[0073] (1) Preparation of the inner core: prepare a nickel-cobalt mixed salt solution with a molar concentration ratio of nickel sulfate and cobalt sulfate of 8:2, wherein the total concentration of nickel and cobalt ions is 1.0mol / L; prepare 18wt% ammonia water, 8mol / L Sodium hydroxide solution, with ammonia water as complexing agent and NaOH as precipitating agent. The nickel-cobalt mixed salt solution was added to the reactor at a rate of 150 L / h with a metering pump, and ammonia water was added to the reactor at a rate of 12 L / h for coprecipitation reaction. The reaction temperature is 65°C, the pH value is controlled at 11.2, and the reaction is carried out for 10 hours to obtain the inner core, namely [Ni(OH) 2 ] 0.8 ·[Co(OH) 2 ] 0.2 ;

[0074] (2) Formation of core-shell structure: Prepare aluminum salt complex solution A wi...

Embodiment 3

[0084] A preparation method of a lithium-ion battery cathode material precursor with a core-shell structure, comprising the following steps:

[0085] (1) Preparation of the inner core: prepare a nickel-cobalt mixed salt solution with a molar concentration ratio of nickel sulfate and cobalt sulfate of 8.5:1.5, wherein the total concentration of nickel and cobalt ions is 1.5mol / L; prepare 19wt% ammonia water, 8mol / L The sodium hydroxide solution, with ammonia as a complexing agent, NaOH as a precipitant, the nickel-cobalt mixed salt solution is added to the reactor at a rate of 180L / h with a metering pump, and ammonia is added to the reactor at a rate of 18L / h. Co-precipitation reaction, the reaction temperature is 60 ° C, the pH value is controlled at 10.85, and the reaction is 9 hours to obtain the inner core, that is, [Ni(OH) 2 ] 0.85 ·[Co(OH) 2 ] 0.15 ;

[0086] (2) Formation of core-shell structure: prepare aluminum salt complex solution A with aluminum ion concentratio...

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Abstract

The invention provides a positive electrode material precursor of a lithium ion battery. The positive electrode material precursor is a core-shell structure, and comprises an inner core and a shell, the inner core is [Ni(OH)2]<x>.[Co(OH)2]<y> with constant constituents, and the shell is [Ni(OH)2].[Co(OH)2].[Al(OH)3]<c> with gradually changing constituents, wherein x is greater than or equal to 0.7 and less than 1, y is greater than 0 and not greater than 0.3, and x+y is equal to 1; a is greater than 0.55 and less than 1, b is greater than 0 and less than 0.3, c is greater than 0 and not greater than 0.15, a+b+c is equal to 1, and x / y is equal to a / b; from an interface between the inner core and the shell to the surface of the shell, content of nickel and content of cobalt both decrease gradually, and content of aluminum increases gradually. The positive electrode material precursor has the advantages of high specific capacity of the inner core and high stability of the shell, and also can avoid generation of a gap between the inner core and the shell after discharging many times. The invention also provides a preparation method of the positive electrode material precursor.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrode materials, and in particular relates to a lithium-ion battery cathode material precursor and a preparation method thereof. Background technique [0002] Lithium-ion batteries are a new generation of green high-energy batteries, which are increasingly playing an important role in various fields. As an important part of lithium-ion batteries, the cathode material of lithium batteries determines the performance, price and development of lithium batteries. Among all kinds of cathode materials for lithium-ion batteries, nickel-cobalt-aluminum ternary cathode materials have become a recent research hotspot due to their low raw material cost, high specific capacity and cycle stability. [0003] Among them, for the nickel-cobalt-aluminum cathode material with high nickel content (Ni≥0.7), although the system has a high specific capacity, the Ni 2+ and Li + The mixing of the materi...

Claims

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Application Information

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IPC IPC(8): H01M4/52H01M4/36H01M4/38H01M10/0525
CPCH01M4/366H01M4/463H01M4/52H01M10/0525Y02E60/10
Inventor 许开华张云河
Owner JINGMEN GEM NEW MATERIAL
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