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Calcium-doped ternary positive electrode material of lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, electrical components, secondary batteries, etc., can solve problems such as limited applications, and achieve the effects of low cost, readily available raw materials, and easy control of reaction conditions

Inactive Publication Date: 2015-12-16
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lithium-nickel mixing problem in ternary materials severely limits its application.

Method used

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  • Calcium-doped ternary positive electrode material of lithium ion battery and preparation method thereof
  • Calcium-doped ternary positive electrode material of lithium ion battery and preparation method thereof
  • Calcium-doped ternary positive electrode material of lithium ion battery and preparation method thereof

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preparation example Construction

[0016] The preparation method of the above-mentioned calcium-doped lithium-ion battery ternary positive electrode material proposed by the present invention specifically includes the following steps:

[0017] 1) According to the molar ratio of Li:(Ni+Mn+Co+Ca)=1:1, nickel acetate, manganese acetate, cobalt acetate, calcium nitrate and LiOH·H 2 O grinding and mixing, wherein, Ni 0.8-x mn 0.1 co 0.1 Ca x o 2 , 0≤x≤0.08, to obtain a mixture of acetate, calcium nitrate and lithium hydroxide;

[0018] 2) Put the obtained mixture in a muffle furnace, raise the temperature to 500°C at a heating rate of 3°C-5°C / min, and keep it for 5-8 hours;

[0019] 3) Then raise the temperature to 700-1000°C at a heating rate of 3°C-5°C / min, and calcine for 12-24 hours;

[0020] 4) naturally cooling to room temperature to obtain a calcium-doped lithium ion battery ternary cathode material.

Embodiment 1

[0022] LiNi 0.78 mn 0.1 co 0.1 Ca 0.02 o 2 Preparation of:

[0023] 1) According to the molar ratio of Li:(Ni+Mn+Co+Ca)=1:1, mix 7.84mmol nickel acetate, 1mmol manganese acetate, 1mmol cobalt acetate, 0.16mmol calcium nitrate and 10mmolLiOH·H 2 O grinds and mixes, obtains the mixture of acetate, calcium nitrate and lithium hydroxide;

[0024] 2) Put the obtained mixture in a muffle furnace, raise the temperature to 500°C at a heating rate of 3°C / min, and keep it for 8 hours;

[0025] 3) heating up to 700° C. at the same heating rate, and calcining for 12 hours;

[0026] 4) naturally cooling to room temperature to obtain a calcium-doped lithium ion battery ternary cathode material.

[0027] Characterization of the obtained calcium-doped ternary positive electrode material: the obtained calcium-doped ternary positive electrode material is analyzed by an X-ray diffractometer and can be known as a solid solution of a pure phase, such as figure 1 shown. figure 2 It is the...

Embodiment 2

[0029] LiNi 0.78 mn 0.1 co 0.1 Ca 0.02 o 2 Preparation of:

[0030] 1) According to the molar ratio of Li:(Ni+Mn+Co+Ca)=1:1, mix 7.84mmol nickel acetate, 1mmol manganese acetate, 1mmol cobalt acetate, 0.16mmol calcium nitrate and 10mmolLiOH·H 2 O grinds and mixes, obtains the mixture of acetate, calcium nitrate and lithium hydroxide;

[0031] 2) Put the obtained mixture in a muffle furnace, raise the temperature to 500° C. at a heating rate of 4° C. / min, and keep it for 5 hours;

[0032] 3) heating up to 800° C. at the same heating rate, and calcining for 12 hours;

[0033] 4) naturally cooling to room temperature to obtain a calcium-doped lithium ion battery ternary cathode material.

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Abstract

The invention relates to a calcium-doped ternary positive electrode material of a lithium ion battery and a preparation method thereof, belonging to the technical field of inorganic materials. The calcium-doped ternary positive electrode material of the lithium ion battery is prepared by doping calcium element into the ternary material, and adopting a simple solid phase method and high-temperature solid phase sintering reaction. The preparation method comprises the steps of grinding and mixing nickel acetate, manganese acetate, cobaltous acetate, calcium nitrate LiOH.H2O uniformly to obtain a mixture, increasing the temperature to 500DEG C according to the temperature increasing rate being 3 DEG C-5 DEG C, and maintaining the temperature for 5-8h; and increasing the temperature to 700-1000 DEG C by the same temperature increasing rate, calcining for 12-24h, and naturally cooling to the room temperature. Compared with the material without doping, the calcium-doped ternary positive electrode material has the advantages that the specific capacity, the cycle stability, the rate capability and other aspects of the battery are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials, and in particular relates to the preparation of a calcium-doped ternary positive electrode material and its application as a lithium ion battery positive electrode material. Background technique [0002] The sharp shortage of traditional fossil energy and the environmental pollution it brings make the development of new energy of great strategic significance. Lithium-ion batteries have become a new generation of energy storage systems due to their advantages of high energy density, long cycle life, no memory effect and environmental friendliness, and are widely used in the field of portable electronic devices. In addition, with the rapid development of electric vehicles and hybrid vehicles, lithium-ion batteries have shown broad application prospects and market potential as power batteries in the field of electric vehicles. At present, the commonly used cathode material for lithium-i...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/1391H01M10/0525
CPCH01M4/1391H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 肖小玲陈敏敏赵恩岳胡中波
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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