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Lithium nickel manganese oxygen composite cathode material and preparation method thereof

A composite cathode material, lithium nickel manganese oxide technology, applied in battery electrodes, electrical components, circuits and other directions, can solve the problems of limited application, toxic pollution of the environment, unfavorable practical application, etc., to achieve the effect of improving cycle stability

Inactive Publication Date: 2012-01-18
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the above-mentioned methods improve their cycle stability to a certain extent, these methods are complicated in steps or high in cost or pollute the environment with toxicity, etc., and are limited to laboratory research, which is not conducive to practical application
Moreover, studies have shown that LiNi 0.5 mn 1.5 o 4 The conductivity of the material is 7.2x 10 -7 Scm -1 , for the charge-discharge process of the electrode controlled by the conductivity, it also has some restrictions on its application

Method used

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  • Lithium nickel manganese oxygen composite cathode material and preparation method thereof
  • Lithium nickel manganese oxygen composite cathode material and preparation method thereof
  • Lithium nickel manganese oxygen composite cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1. Weigh 13.142g NiSO respectively 4 ·6H 2 O and 25.35gMnSO 4 ·H 2 O is prepared into a mixed aqueous solution. Under stirring, NaOH solution is added dropwise to the mixed solution, and the pH value of the mixed solution is controlled at about 10.3 to ensure Ni 2 +, Mn 2+ The precipitation is complete, after standing for 2 hours, suction filtration, washing three times, and drying at 110°C for 12 hours to obtain 17.85g Ni 0.5 Mn 1.5 (OH) 4 , Respectively weigh 3.6gNi 0.5 Mn 1.5 (OH) 4 And 0.739gLi 2 CO 3 , Ball milling to mix uniformly, then program temperature controlled air atmosphere sintering, heating to 500°C at a heating rate of 4°C / min, holding for 4 hours; then heating to 900°C at a heating rate of 5°C / min, calcination for 10 hours; then cooling at 5°C / min The speed drops to 600℃, annealing for 12h; finally, the temperature is naturally cooled to room temperature. Get 3.52g LiNi 0.5 Mn 1.5 O 4 .

[0039] 2. Weigh 6gLiNi separately 0.5 Mn 1.5 O 4 , 0.061g carbon bla...

Embodiment 2

[0042] 1. Preparation of LiNi 0.5 Mn 1.5 O 4 The scheme is the same as in Example 1

[0043] 2. Weigh 5gLiNi separately 0.5 Mn 1.5 O 4 , 0.048g acetylene black and 2.31g sucrose are added to the planetary ball mill, ball milled at 500r / min for 3h, the ball mill is evenly mixed, and sintered in an air atmosphere. The temperature rise rate is 5°C / min to 400°C, and the temperature is kept for 1.5 hours. The precursor body is carbonized to obtain lithium nickel manganese oxygen composite cathode material.

[0044] 3. The test methods of the composite cathode material assembled battery are the same as in Example 1

Embodiment 3

[0046] 1. Preparation of LiNi 0.5 Mn 1.5 O 4 The scheme is the same as in Example 1

[0047] 2. Weigh 8gLiNi separately 0.5 Mn 1.5 O 4 , 0.081g Super P, 0.472g polyvinyl alcohol were added to the planetary ball mill, ball milled at a speed of 350r / min for 7 hours, the ball mill was mixed uniformly, and sintered in an air atmosphere. The temperature was increased at a rate of 6°C / min to 500°C and kept for 1.5 hours. The precursor of the carbon source is carbonized to obtain lithium nickel manganese oxygen composite cathode material.

[0048] 3. The test methods of the composite cathode material assembled battery are the same as in Example 1

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Abstract

The invention relates to a lithium nickel manganese oxygen composite cathode material and a preparation method thereof; the preparation method comprises the following steps: weighing Ni0.5Mn1.5(OH)4 and Li2CO3 according to a stoichiometric ratio of LiNi0.5Mn1.5O4; performing ball milling mixing of Ni0.5Mn1.5(OH)4 and Li2CO3; sintering Ni0.5Mn1.5(OH)4 and Li2CO3 after ball milling mixing to prepare LiNi0.5Mn1.5O4; performing ball milling and well mixing of LiNi0.5Mn1.5O4, a conductive agent, and a carbon source precursor; sintering the LiNi0.5Mn1.5O4, the conductive agent, and the carbon source precursor to prepare the lithium nickel manganese oxygen composite cathode material.

Description

Technical field [0001] The invention relates to a lithium nickel manganese oxygen composite cathode material and a preparation method thereof. Background technique [0002] In recent years, with the increasingly serious energy and environmental problems and the demand for lighter electronic products, people have been studying lithium ion secondary batteries continuously. LiNi 0.5 Mn 1.5 O 4 During the charging and discharging process, there is mainly a 4.7V platform, the theoretical capacity can reach 146.7mAh / g, and it has a higher energy density. It is expected to be applied as a power battery, so it has become a hot spot in the research of lithium-ion batteries. During charging and discharging, the voltage is as high as about 5V, so that the electrolyte on the electrode surface is continuously oxidized and decomposed, deposited on the electrode surface, hindering the de-intercalation of lithium ions, causing deterioration of cycle performance and capacity degradation. In orde...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 刘三兵刘志远
Owner CHERY AUTOMOBILE CO LTD
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