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A lithium-rich manganese-based mixed conductor positive electrode material and preparation method thereof

A lithium-rich manganese-based, mixed conductor technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve problems such as poor electronic conductivity and affect electrochemical performance, and achieve increased electronic conductivity and first Coulomb efficiency. The effect of high and superior magnification performance

Active Publication Date: 2016-11-09
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

FeF 3 The unique open structures enable it to provide very good ionic conductivity, but its own poor electronic conductivity, which affects its electrochemical performance to a certain extent

Method used

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  • A lithium-rich manganese-based mixed conductor positive electrode material and preparation method thereof
  • A lithium-rich manganese-based mixed conductor positive electrode material and preparation method thereof
  • A lithium-rich manganese-based mixed conductor positive electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] 11mol of lithium hydroxide, 4mol of manganese nitrate, 3mol of nickel nitrate and 3mol of cobalt nitrate were evenly mixed and dispersed in the carboxymethyl cellulose solution, and stirred until a suspension was formed; The viscous slurry was prepared by grinding at a speed of 1 / min for 2 hours; the above slurry was spray-dried by a spray dryer, the feed rate was controlled at 10mL / min, the inlet temperature was 320°C, and the outlet temperature was 120°C to prepare the precursor; The body was placed in a sintering furnace, and the temperature was raised to 950°C at a heating rate of 5°C / min, and kept for 10 hours to obtain a lithium-rich manganese-based solid solution 0.1Li 2 MnO 3 0.9LiMn 1 / 3 Ni 1 / 3 co 1 / 3 o 2 . Add 1 mol of ferric chloride and 3 mol of hydrogen fluoride into a sealed hydrothermal reaction kettle, raise the temperature to 160°C, react for 5h, filter with suction, wash, and dry at 130°C to obtain FeF 3 powder. The obtained manganese-based solid...

Embodiment 2

[0035] Lithium phosphate 13mol, manganese oxalate 3.33mol, nickel carbonate 2.33mol, cobalt carbonate 2.33mol were uniformly mixed and dispersed in the styrene-butadiene rubber solution, stirred until a suspension was formed; The viscous slurry was prepared by grinding at a speed of 1 / min for 5 hours; the above slurry was spray-dried by a spray dryer, the feed rate was controlled at 20mL / min, the inlet temperature was 200°C, and the outlet temperature was 80°C to prepare the precursor; The body was placed in a sintering furnace, and the temperature was raised to 950°C at a heating rate of 10°C / min, and kept for 20 hours to obtain a lithium-rich manganese-based solid solution 0.3Li 2 MnO 3 0.7LiMn 1 / 3 Ni 1 / 3 co 1 / 3 o 2 . Add 1 mol of ferric chloride and 3 mol of hydrogen fluoride into a sealed hydrothermal reaction kettle, raise the temperature to 240°C, react for 15 hours, filter with suction, wash, and dry at 90°C to obtain FeF 3 powder. The prepared manganese-based so...

Embodiment 3

[0037]15 mol of lithium hydroxide, 6.67 mol of manganese carbonate, 1.67 mol of nickel oxalate, and 1.67 mol of cobalt hydroxide were uniformly mixed and dispersed in the polyvinyl alcohol solution, stirred until a suspension was formed; the suspension was transferred to a roller mill tank, Grind at a speed of 500r / min for 20 hours to obtain a viscous slurry; use a spray dryer to spray dry the above slurry, control the feed rate to 50mL / min, the inlet temperature is 280°C, and the outlet temperature is 150°C to prepare the precursor; Place the precursor in a sintering furnace, raise the temperature to 950°C at a heating rate of 2°C / min, and keep it warm for 6 hours to obtain a lithium-rich manganese-based solid solution 0.5Li 2 MnO 3 0.5LiMn 1 / 3 Ni 1 / 3 co 1 / 3 o 2 . Add 1 mol of ferric nitrate and 3 mol of hydrogen fluoride into a sealed hydrothermal reaction kettle, raise the temperature to 200°C, react for 20 hours, filter with suction, wash, and dry at 100°C to obtain...

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Abstract

The invention relates to an anode material of a rich-lithium-manganese-based mixed conductor and a preparation method of the anode material. The anode material of the mixed conductor comprises Xli2 MnO3.(1-X) LiMn 1 / 3Ni 1 / 3 Co1 / 3O2 (x is equal to =0.1-0.5), FeF3 and CNTs. The preparation method of the anode material comprises the steps as follows: 70%-90% of the rich-lithium-manganese-based solid solution Xli2 MnO3..(1-X) LiMn 1 / 3Ni 1 / 3 Co1 / 3O2, 5%-25% of the FeF3 and 1%-10% of the CNTs (added in a CNTs conductive liquid mannerform) are subjected to high-energy ball milling mixing and annealing in a mass percentage, so that the anode material of the rich-lithium-manganese-based mixed conductor of a lithium ion battery is obtained. The prepared anode material of the rich-lithium-manganese-based mixed conductor has high ionic conductivity and electronic conductivity, the specific discharge capacity reaches 270 m Ah / g for the first time, the charge and discharge coulombic efficiency reaches as high as 90% for the first time, and the anode material has excellent rate performance and cycling stability.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular, the invention relates to a lithium-rich manganese-based mixed conductor positive electrode material and a preparation method thereof. Background technique [0002] High specific energy and high specific power are the inevitable demand for lithium-ion batteries in the future market, and the development of lithium-ion battery cathode materials with high capacity and high rate performance is the key. LiCoO, a commercial cathode material for lithium-ion batteries 2 , LiMn 2 o 4 、LiFePO 4 The discharge specific capacity of these materials is below 200mAh / g, and their energy density is limited. However, lithium-rich cathode materials, especially lithium-rich manganese-based cathode materials, have attracted widespread attention due to their ultra-high specific capacity and relatively low price. Currently reported lithium-rich manganese-based cath...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/505H01M4/62
CPCH01M4/364H01M4/505H01M4/525H01M4/582H01M4/625H01M10/0525Y02E60/10
Inventor 杨顺毅黄果岳敏黄友元任建国
Owner BTR NEW MATERIAL GRP CO LTD
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