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Preparation method of rock salt type lithium ion battery cathode material, lithium ion battery cathode material, and applications thereof

A lithium-ion battery, cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as high price and capacity decay, and achieve the effects of cheap raw materials, high specific capacity, and easy availability of raw materials

Active Publication Date: 2018-10-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the specific capacity of these materials is below 270mAh / g, such as nickel-manganese spinel (LiNi 0.5 mn 1.5 o 4 ) Although it has a working voltage of 4.7V, its theoretical capacity is only 147mAh / g, but its actual capacity can only reach 130mAh / g
In addition, the above-mentioned materials are also expensive, and the capacity decays quickly under high temperature conditions.

Method used

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  • Preparation method of rock salt type lithium ion battery cathode material, lithium ion battery cathode material, and applications thereof
  • Preparation method of rock salt type lithium ion battery cathode material, lithium ion battery cathode material, and applications thereof
  • Preparation method of rock salt type lithium ion battery cathode material, lithium ion battery cathode material, and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A kind of rock salt type lithium ion battery cathode material Li 4 mn 2 o 5 The preparation method comprises the following steps:

[0037] (1) Mix 9.231g of lithium hydroxide monohydrate, 8.694g of manganese dioxide, and 7.094g of manganese oxide into a planetary ball mill and grind for 30 minutes to obtain a uniform mixture;

[0038] (2) Heat the mixture obtained in step (1) to 1000°C for 8 hours in a tube furnace under a nitrogen atmosphere, and then cool naturally with the furnace after the calcination, and grind the calcined product to obtain black new LiMnO 2 Precursor;

[0039] (3) Weigh 8.000 g of the precursor obtained in step (2) and 2.535 g of lithium peroxide, place them in a planetary ball mill and grind for 30 minutes, heat up to 900 ° C for 6 hours in a tube furnace under a nitrogen atmosphere, and then cool down to Annealing treatment at 550°C for 3 hours, cooling in the furnace after annealing, and finally obtaining a black powder material, which is ...

Embodiment 2

[0047] A kind of rock salt type lithium ion battery cathode material Li 4 mn 2 o 5 The preparation method comprises the following steps:

[0048] (1) Mix 7.770g lithium carbonate, 8.694g manganese dioxide, and 7.094g manganese oxide into a planetary ball mill and grind for 30 minutes to obtain a uniform mixture;

[0049] (2) Heat the mixture obtained in step (1) to 900°C for 10 h in a tube furnace under a nitrogen atmosphere, and then cool naturally with the furnace after the calcination, and grind the calcined product to obtain black new LiMnO 2 Precursor;

[0050] (3) Weigh 8.000 g of the precursor obtained in step (2) and 2.730 g of lithium peroxide, place them in a planetary ball mill and grind for 30 minutes, heat up to 800 °C for 7 hours in a tube furnace under a nitrogen atmosphere, and then cool down to Annealing treatment at 500°C for 3 hours, cooling in the furnace after annealing, and finally obtaining a black powder material, which is the rock-salt lithium-ion ...

Embodiment 3

[0055] A kind of rock salt type lithium ion battery cathode material Li 4 mn 2 o 5 The preparation method comprises the following steps:

[0056] (1) Mix 7.770g lithium carbonate, 11.495g manganese carbonate, and 7.094g manganese oxide into a planetary ball mill and grind for 30 minutes to obtain a uniform mixture;

[0057] (2) Heat the mixture obtained in step (1) to 900°C for 9 hours in a tube furnace under a nitrogen atmosphere, and then cool naturally with the furnace after the calcination, and grind the calcined product to obtain black new LiMnO 2 Precursor;

[0058] (3) Weigh 8.000 g of the precursor obtained in step (2) and 2.630 g of lithium peroxide, place them in a planetary ball mill and grind for 30 minutes, heat up to 800 °C for 8 hours in a tube furnace under a nitrogen atmosphere, and then cool down to Annealing treatment at 600°C for 4 hours, cooling in the furnace after annealing, and finally obtaining a black powder material, which is the rock-salt lithiu...

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Abstract

The invention discloses a preparation method of a rock salt type lithium ion battery cathode material. The preparation method comprises following steps: (1) evenly mixing a lithium source, a high-valence manganese source, and a low-valence manganese source, burning the mixture in an inert atmosphere, cooling the mixture in a furnace, and grinding the mixture to obtain a LiMnO2 precursor; and (2) evenly mixing the LiMnO2 precursor obtained in the step (1) with lithium peroxide, grinding, burning the mixture in an inert atmosphere, carrying out an annealing treatment, and cooling the mixture ina furnace to obtain the rock salt type lithium ion battery cathode material (Li4Mn2O5). The invention also provides a rock salt type lithium ion battery cathode material and applications thereof. Theprovided rock salt type lithium ion battery cathode material (Li4Mn2O5) has a pure phase rock salt structure, does not contain any purity phase, and has excellent electrochemical properties.

Description

technical field [0001] The invention belongs to the field of battery materials, and in particular relates to an electrode material for a lithium ion battery and a preparation method and application thereof. Background technique [0002] With the improvement of people's living standards, and the rapid development of transportation, communication and electronic information technology. The development of new lithium-ion batteries has gradually evolved into a trend that can achieve high energy, long life, safety and low cost, while reducing pollution and being recyclable, which makes lithium-ion batteries move towards higher energy density, larger volume specific capacity, better development in the direction of safety and environmental friendliness. At the same time, my country's energy reserves are relatively low, and more than 50% of the current oil demand still depends on imports, which seriously limits the rapid development of my country's economy, especially in the current...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505
CPCH01M4/505Y02E60/10
Inventor 黄国勇郭学益田庆华杨晨林
Owner CENT SOUTH UNIV
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