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Nickel-based positive active material of lithium ion secondary battery and preparation method thereof

A positive electrode active material and secondary battery technology, which is applied in the field of lithium transition metal oxide materials and its preparation, can solve the problems of poor material processing performance, easy gas swelling, poor safety performance, etc., and achieve high gram capacity, Guaranteed safety and processability, the effect of high operating voltage

Active Publication Date: 2014-07-23
NANTONG RESHINE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Lithium cobalt oxide has always been the most widely used cathode material for lithium-ion batteries, and its market share once reached more than 90%. In order to meet the energy density requirements of lithium-ion batteries, it is necessary and urgent to develop a new lithium-ion battery cathode material with high energy density, good cycle performance and safety performance. The nickel-based cathode material is lithium nickelate Compared with the current lithium cobalt oxide, the modified positive electrode material has a higher gram capacity, which is nearly 40% higher, and is currently the material with the highest energy density. However, due to the surface of the nickel-based positive electrode material The LiNiO2 structure of LiNiO2 is easy to decompose, so that the alkalinity of the material is high, resulting in difficulty in homogenization, poor processing performance of the material, and prone to gas swelling, and poor safety performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The first step, the preparation of the precursor of the positive electrode material of the lithium-ion secondary battery:

[0029] a. Preparation of the solution: Mixed salt solution A1 is prepared by molar ratio Ni: Co =0.1:0.9, and mixed salt solution B1 is prepared by molar ratio Ni:Mn =0.05:0.95, so that the metal ion concentration in the salt solution is 0.4 mol / L; the preparation concentration is the alkali solution of 2mol / L, and the preparation concentration is the complexing agent solution of 2mol / L;

[0030] b. The preparation of the first night: inject pure water into the reaction vessel, adjust the pH value of the solution to 8.5 with an alkaline solution, and keep the temperature in the reaction vessel at 40°C, and at the same time pass inert gas through the entire reaction process;

[0031] c. Precursor reaction: Add A1 or B1 solution into the reaction vessel, control the flow rate to 3L / min, and slowly add an appropriate amount of complexing agent and alk...

Embodiment 2

[0042] a. Preparation of the solution: Mixed salt solution A1 is prepared by molar ratio Ni: Co: Mn = 1.0:0:0, and mixed salt solution B1 is prepared by molar ratio Ni: Co = 0.95: 0.05, so that the metal in the salt solution The ion concentration is 3mol / L; the sodium hydroxide alkali solution with a concentration of 10mol / L is prepared, and the complexing agent EDTA solution with a concentration of 11mol / L is prepared;

[0043] b. The preparation of the first night: inject pure water into the reaction vessel, adjust the pH value of the solution to 13.5 with alkaline solution, and keep the temperature in the reaction vessel at 80°C, and at the same time pass inert gas through the entire reaction process;

[0044] c. Reaction of the precursor: Add A1 or B1 solution into the reaction vessel, control the flow rate to 20L / min, and slowly add an appropriate amount of complexing agent and alkali solution, adjust the pH value to 10, and keep the temperature in the reaction vessel at 8...

Embodiment 3

[0051] The first step, the preparation of the precursor of the positive electrode material of the lithium-ion secondary battery:

[0052] a. Solution preparation: Mixed salt solution A1 is prepared by molar ratio Ni: Co: Mn = 0.6: 0.2: 0.2, and mixed salt solution B1 is prepared by molar ratio Ni: Co: Mn = 0.5: 0.2: 0.3. The metal ion concentration in the salt solution is 1.5mol / L; the sodium hydroxide solution with a concentration of 2.5mol / L is prepared, and the complexing agent ammonia solution with a concentration of 2.5mol / L is prepared;

[0053] b. The preparation of the first night: inject pure water into the reaction vessel, and adjust the pH value of the solution to 11 with sodium hydroxide alkali solution, and keep the temperature in the reaction vessel at 55°C, and at the same time pass inert gas through the entire reaction process ;

[0054] c. Precursor reaction: Add A1 or B1 solution into the reaction vessel, control the flow rate to 10L / min, and slowly add an a...

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Abstract

The invention discloses a nickel-based positive active material of a lithium ion secondary battery. The nickel-based positive active material is subjected to wrapping treatment and is prepared from the following components in percentage by weight: 50%-99.5 percent of nickel-based material as a matrix and 0.05-50 percent of shell material. A general formula of the lithium ion secondary battery can be expressed as [Li(p)Ni(x)Co(y)Mn(z)O2][Li(q)Ni(a)Co(b)Mn(c)O2]. A preparation method of the nickel-based positive active material comprises the steps of preparing a precursor of the positive material of the lithium ion secondary battery; and preparing the positive material of the lithium ion secondary battery. According to the invention, as the gradient variation of nickel concentration between the matrix material and the shell material is realized by virtue of wrapping, the nickel-based positive active material has good electrochemical performance of high gram volume, high working voltage, good cycle performance and the like, and the safety and the machinability of the material are also ensured. In addition, the preparation method is high in the operability, is favorable for industrial production and has high application value.

Description

technical field [0001] The invention relates to a lithium transition metal oxide material and a preparation method thereof, in particular to a nickel-based positive electrode active material for a lithium ion secondary battery and a preparation method thereof. Background technique [0002] Due to its high energy density, high working voltage and rechargeability, lithium-ion secondary batteries have developed very fast since their inception, and their application fields have also gradually expanded, from the initial power supply of portable devices to defense , automotive and aviation fields. The capacity and performance of the lithium-ion battery are mainly affected by the cathode material, and the cathode material accounts for about 30% of the cost of the lithium-ion battery. Therefore, the development of high-performance cathode materials is the key to improving the technology of lithium-ion batteries. [0003] Lithium cobalt oxide has always been the most widely used cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/38H01M4/1395
CPCH01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李兴翠池田一崇张海波王飞飞陆建佟
Owner NANTONG RESHINE NEW MATERIAL
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