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Preparation method of lithium nickel manganese oxide lithium ion battery cathode material

A technology for lithium ion batteries and cathode materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of low energy density, low tap density of lithium nickel manganate materials, and high equipment requirements, and achieves the improvement of tap density. Effect

Active Publication Date: 2016-03-30
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tap density of the lithium nickel manganese oxide material synthesized by using oxalate or carbonate as the precipitant is low, so the energy density in the power battery is small; while the lithium nickel manganese oxide synthesized by the hydroxide as the precipitant Although the material has a high tap density, it needs the protection of an inert gas, and the requirements for the equipment are also high.

Method used

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  • Preparation method of lithium nickel manganese oxide lithium ion battery cathode material
  • Preparation method of lithium nickel manganese oxide lithium ion battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) According to the molar ratio n(Ni):n(Mn)=1:3, accurately weigh manganese sulfate and nickel sulfate, and add appropriate amount of distilled water to prepare mixed solution A.

[0018] (2) Prepare precipitant solution B according to the molar ratio of sodium oxalate to sodium hydroxide is 1.5:1.

[0019] (3) Add the mixed salt solution A and the precipitant solution B to the container containing distilled water at the same time, and under the condition that the stirring speed is 300r / min, adjust the pH value in the reaction solution to about 9.5 by controlling the speed of adding the precipitant . During the whole reaction process, the temperature of the reaction solution was 40° C., washed and dried after 3 hours of reaction to obtain a precursor of manganese oxalate / nickel hydroxide.

[0020] (4) Place the precursor obtained in step (3) in an environment of 500° C. for 6 hours and pre-calcine the product lithium carbonate according to the molar ratio of n(Li):n(N...

Embodiment 2

[0023] (1) According to the molar ratio n(Ni):n(Mn)=1:3, accurately weigh manganese sulfate and nickel sulfate, and add appropriate amount of distilled water to prepare mixed solution A.

[0024] (2) Prepare precipitant solution B according to the molar ratio of potassium oxalate to sodium hydroxide of 1.5:1.

[0025] (3) Add the mixed salt solution A and the precipitant solution B to the container containing distilled water at the same time, and under the condition that the stirring speed is 300r / min, adjust the pH value in the reaction solution to about 9.3 by controlling the speed of adding the precipitant . During the whole reaction process, the temperature of the reaction solution was kept at 50° C., washed and dried after reacting for 3 hours to obtain a precursor of manganese oxalate / nickel hydroxide.

[0026] (4) Place the precursor obtained in step (3) in an environment of 500° C. for 6 hours and pre-calcine the product and lithium carbonate according to the molar ra...

Embodiment 3

[0029] (1) According to the molar ratio n(Ni):n(Mn)=1:3, accurately weigh manganese sulfate and nickel sulfate, add appropriate amount of distilled water to configure mixed solution A;

[0030] (2) The molar ratio is n(C 2 o 4 2- ): n(OH - )=1.5:1 Potassium oxalate, ammonium oxalate and potassium hydroxide precipitant solution B, wherein n (potassium oxalate):n (ammonium oxalate)=2:1;

[0031] (3) Add the mixed salt solution A and the precipitant solution B to the container containing distilled water at the same time, and under the condition that the stirring speed is 300r / min, adjust the pH value in the reaction solution to about 9.8 by controlling the speed of adding the precipitant . In addition, during the whole reaction process, the temperature of the reaction solution is at 50°C, and after 3 hours of reaction, it is washed and dried to obtain the precursor of manganese oxalate / nickel hydroxide;

[0032] (4) Place the precursor obtained in step (3) in an environment ...

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Abstract

The invention discloses a preparation method for a lithium ion battery cathode material-lithium nickel manganese oxide. The method adopts oxalate and hydroxide as precipitants at the same time for preparing lithium nickel manganese oxide through a coprecipitation method and a solid-phase sintering method. The method comprises the following steps: synthesizing a lithium nickel manganese oxide precursor by double precipitants, that is, synthesizing an oxalate / nickel hydroxide compound precursor material by controlling the pH value of a reaction solution according to the characteristic that concentration product values of oxalate and nickel hydroxide are similar; mixing the precursor material with a lithium source; sintering to synthesize the cathode material-lithium nickel manganese oxide. According to the method, the step of adopting only hydroxide as the precipitant under inert gas shielding is removed, so that the production cost is reduced; compared with lithium nickel manganese oxide prepared by taking only oxalate as the precipitant, the tap density is effectively improved; as the concentration product values of oxalate and nickel hydroxide are similar, the more uniform oxalate / nickel hydroxide compound precursor material can be obtained according to the control on the pH value of the solution.

Description

technical field [0001] The invention relates to a preparation method of lithium nickel manganese oxide, a cathode material of a lithium ion battery. Background technique [0002] With the development of society, my country's energy crisis and environmental pollution are becoming more and more serious, and the development and research of power batteries have attracted much attention. Lithium-ion battery is a high-energy battery that has developed rapidly in the past ten years. It has become an important direction for the development of my country's new energy industry in terms of technical indicators such as life, specific energy, and voltage, and from the environment. The positive electrode material lithium nickel manganese oxide has the advantages of high discharge voltage, good thermal stability and low price, and is considered to be the most potential positive electrode material. At present, the precipitants for synthesizing lithium nickel manganese oxide material precur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10
Inventor 张昌春王启岁
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY