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A kind of preparation method of manganese cobalt lithium cathode material

A positive electrode material, manganese-cobalt-lithium technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of high-temperature safety performance and high-temperature cycle performance of pure manganese-cobalt-lithium materials, and achieve high-temperature electrochemical stability , high specific capacity and long service life

Active Publication Date: 2017-12-15
广州盘太能源科技有限公司
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AI Technical Summary

Problems solved by technology

[0004] However, the high-temperature safety performance and high-temperature cycle performance of pure manganese-cobalt-lithium materials are not very good.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The chemical formula of the active material of the positive electrode material of the present embodiment is Li 1.02 mn .58 co 0.32 Mg 0.1 o 2 I 0.01 .

[0017] Prepare a mixed solution of manganese sulfate and cobalt sulfate with a molar ratio of Mn: Co = 0.58:0.32. The total concentration of the three metal ions in the mixed solution is 2 mol / L; prepare a KOH solution with a concentration of 4 mol / L, 0.5 mol / L of ammonia solution, according to NH 3 ·H 2 The ratio of O:KOH=0.3 is to mix the KOH solution and the ammonia solution to form a mixed alkali solution.

[0018] Add the two mixed solutions into the reaction kettle in parallel, under the protection of nitrogen or inert gas, control the reaction in a continuous reaction mode, the pH value is controlled at 11, the temperature is 50 ° C, filtered and washed until the pH value of the washing water is less than 7.5, at 105 ° C Drying at a lower temperature to obtain the manganese-cobalt hydroxide precursor.

...

Embodiment 2

[0022] The chemical formula of the active material of the positive electrode material of the present embodiment is Li 1.02 mn 0.49 co 0.36 Mg 0.15 o 2 I 0.02 .

[0023] Prepare a mixed solution of manganese sulfate and cobalt sulfate with a molar ratio of Mn:Co = 0.49:0.36. The total concentration of the three metal ions in the mixed solution is 3 mol / L; prepare a KOH solution with a concentration of 6 mol / L, 1mol / L L of ammonia solution, as NH 3 ·H 2 The ratio of O:KOH=0.4 is to mix the KOH solution and the ammonia solution to form a mixed alkali solution.

[0024] Add the two mixed solutions into the reaction kettle in parallel, under the protection of nitrogen or inert gas, control the reaction in a continuous reaction mode, the pH value is controlled at 13, the temperature is 60°C, filter and wash until the pH value of the washing water is less than 7.5, at 110°C Drying at a lower temperature to obtain the manganese-cobalt hydroxide precursor.

[0025] The above-m...

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Abstract

The invention relates to a preparation method of a manganese-cobalt-lithium positive pole material. The manganese-cobalt-lithium positive pole material comprises a core substance and an aluminum phosphate coating layer, wherein the chemical formula of the active core substance is Li1.05Mn<1-x-y>NixTiyO2Fz, wherein x is equal to 0.25-0.35, y is equal to 0.05-0.1, and z is equal to 0.02-0.03. The preparation method comprises the following steps: (1) preparing the active core substance; (2) coating aluminum phosphate. According to the manganese-cobalt-lithium positive pole material prepared through the method, a manganese-nickel-titanium precursor with a specific proportion is prepared by adopting a wet method, then an F-doped active substance with high energy density is obtained by adopting a solid-phase sintering method, and finally an aluminum phosphate layer coats the active substance, so that high specific capacity and electrochemical stability of the material are achieved. Thus, the composite material has high capacity and long service life when used for a lithium ion battery.

Description

technical field [0001] The invention relates to a preparation method of a manganese-cobalt-lithium cathode material. Background technique [0002] As a green secondary battery, lithium-ion batteries have the advantages of light weight, small size, high discharge platform, large capacity, long cycle life, and no memory effect. They have been widely used in mobile electronic appliances such as mobile phones, cameras, and notebook computers. , At the same time, it is increasingly used in artificial satellites, aerospace, electric vehicles and other fields. [0003] At present, commercial lithium-ion secondary batteries mainly use LiCoO 2 It is a positive electrode material, but the relatively poor cobalt element leads to high raw material costs, LiMnO 2 and LiCoO 2 With the same layered structure and abundant resources, low cost, and no environmental pollution, it is an ideal alternative to LiCoO 2 material of choice, but LiMnO 2 It is difficult to accurately control the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/1391H01M4/362H01M4/505H01M4/525Y02E60/10
Inventor 刘振添张利伍儒锋蔡捷萧燕玲刘振辉
Owner 广州盘太能源科技有限公司
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