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Preparation method of sodium ion conductor coated lithium-rich manganese-base stratified anode material

A sodium ion conductor and positive electrode material technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of low energy density and relative capacity, affecting high-rate performance of materials, and low first-cycle coulombic efficiency. High production efficiency, easy control of reaction conditions, good repeatability of results

Active Publication Date: 2019-03-26
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the problems of low energy density and relative capacity of some commercialized positive electrode materials, they cannot meet the growing demand, especially in the case of the current popularization of new energy vehicles, the development of new lithium-ion battery materials with higher capacity seems to be a problem. more important
Among them, lithium-rich materials and high-nickel materials are the two most promising materials. Lithium-rich manganese-based layered cathode materials are more favored in future application research due to their higher capacity, but there are still some urgent problems to be solved. Some of the most obvious disadvantages include: 1) low first cycle coulombic efficiency; 2) low rate performance; 3) low cycle stability; 4) serious voltage decay with increasing cycles
Due to the poor conductivity of lithium ions, traditional oxide-coated materials will affect the high-rate performance of the material; traditional lithium ion conductors only play a role in one aspect, and have no doping effect, and the price of lithium salts is relatively expensive. limited improvement

Method used

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  • Preparation method of sodium ion conductor coated lithium-rich manganese-base stratified anode material
  • Preparation method of sodium ion conductor coated lithium-rich manganese-base stratified anode material
  • Preparation method of sodium ion conductor coated lithium-rich manganese-base stratified anode material

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preparation example Construction

[0022] The preparation method of the sodium ion conductor coated lithium-rich manganese-based layered positive electrode material proposed by the method is coated by a direct stirring method, and the method includes the following steps:

[0023] (1) Preparation of carbonate precursor:

[0024]The metal salt of cobalt, the metal salt of nickel and the metal salt of manganese are dissolved in 100mL water according to the molar ratio, the metal salt of nickel: the metal salt of cobalt: the metal salt of manganese=0.1~0.3:0~0.3:0.4~0.9, The total molar concentration of metal ions is 1-3mol / L to obtain a mixed solution of metal ions; configure NaOH and NaOH with a molar concentration of 1-3mol / L 2 CO 3 , NaHCO 3 , (NH 4 ) 2 CO 3 or NH 4 HCO 3 100mL of any one of the precipitant solutions in the solution, add the precipitant solution to the above metal ion mixed solution under magnetic stirring to produce a precipitate, stir for 6 to 12 hours, centrifuge, and use deionized wa...

Embodiment 1

[0034] (1) Cobalt metal salt CoSO 4 Metal salt NiSO with nickel 4 Metal salt with manganese MnSO 4 Dissolve in 100mL water according to the molar ratio of 0.13:0.13:0.54, so that the total molar concentration of metal ions is 2mol / L to obtain a mixed solution of metal ions; the configuration molar concentration is 2mol / L Na 2 CO 3 Solution 50mL, under magnetic stirring, add the above precipitant solution into the above metal ion mixed solution to produce a precipitate. After stirring for 8 hours, centrifuge, wash the precipitate twice with deionized water and absolute ethanol respectively, and place the precipitate Dry in 80 ℃ oven for 12 hours, obtain carbonate precursor, the molecular formula of carbonate precursor is: (Ni 0.13 co 0.13 mn 0.54 ) 1.25 CO 3 2H 2 O.

[0035] (2) Combine the carbonate precursor obtained in the above step (1) with LiOH·H 2 O or Li 2 CO 3 Fully ground and mixed according to the molar ratio of 1:1.05, placed in a muffle furnace, calcine...

Embodiment 2

[0040] (1) Cobalt metal salt CoSO 4 Metal salt NiSO with nickel 4 Metal salt with manganese MnSO 4 Dissolve in 100mL water according to the molar ratio of 0.3:0.1:0.4, so that the total molar concentration of metal ions is 2mol / L to obtain a mixed solution of metal ions; the configuration molar concentration is 2mol / L Na 2 CO 3 Solution 50mL, under magnetic stirring, add the above precipitant solution into the above metal ion mixed solution to produce a precipitate. After stirring for 8 hours, centrifuge, wash the precipitate twice with deionized water and absolute ethanol respectively, and place the precipitate Dry in 80 ℃ oven for 12 hours, obtain carbonate precursor, the molecular formula of carbonate precursor is: (Ni 0.1 co 0.3 mn 0.4 ) 1.25 CO 3 2H 2 O.

[0041] (2) Combine the carbonate precursor obtained in the above step (1) with LiOH·H 2 O or Li 2 CO 3 Fully ground and mixed according to the molar ratio of 1:1.05, placed in a muffle furnace, calcined at 9...

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Abstract

The invention relates to a preparation method of a sodium ion conductor coated lithium-rich manganese-base stratified anode material, belonging to the technical field of new energy resources. The preparation method comprises the step of coating by virtue of a normal-temperature stirring method and particularly comprises three steps: preparing a carbonate precursor, preparing an oxide-coated carbonate precursor, and preparing the sodium ion conductor-coated lithium-rich manganese-base stratified anode material. According to the method, the rate capability and cycling stability of the lithium-rich manganese-base stratified anode material can be improved, the voltage attenuation of the lithium-rich manganese-base stratified anode material can be inhibited, and the separation of oxygen can bereduced. The method is simple in synthetic process, high in production efficiency and suitable for large-scale production. The method has the advantages that the raw materials required by reactants are easily available and non-toxic, the cost is low, the special protection is not required in the production process, the reaction conditions are easily controlled, and the obtained product is high inyield and good in result repeatability.

Description

technical field [0001] The invention relates to a preparation method of a lithium-rich manganese-based layered cathode material coated with a sodium ion conductor, and belongs to the technical field of new energy. Background technique [0002] Lithium-rich manganese-based layered cathode materials have excellent capacity (>250mAh g -1 ) and energy density (>1000whkg -1 ) has received great attention in recent years. Due to the problems of low energy density and relative capacity of some currently commercialized positive electrode materials, they cannot meet the growing demand, especially in the case of the current popularization of new energy vehicles, the development of new lithium-ion battery materials with higher capacity seems to be a problem. more important. Among them, lithium-rich materials and high-nickel materials are the two most promising materials. Lithium-rich manganese-based layered cathode materials are more favored in future application research due ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 刘向峰李庆远胡中波
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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