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Preparation method of lanthanum oxide/lithium lanthanite-coated lithium-rich manganese-based anode material

A lithium-rich manganese-based, cathode material technology, applied in the direction of positive electrodes, battery electrodes, active material electrodes, etc., can solve the problems of poor cycle stability of lithium-rich manganese-based cathode materials, improve cycle stability, improve electrical conductivity, The effect of good electrochemical performance

Inactive Publication Date: 2019-07-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for preparing lithium-rich manganese-based cathode materials coated with lanthanum oxide / lithium lanthanate in order to overcome the above-mentioned problems in the prior art, which effectively solves the problem of lithium-rich manganese-based cathode materials. Disadvantages of poor cycle stability

Method used

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  • Preparation method of lanthanum oxide/lithium lanthanite-coated lithium-rich manganese-based anode material
  • Preparation method of lanthanum oxide/lithium lanthanite-coated lithium-rich manganese-based anode material
  • Preparation method of lanthanum oxide/lithium lanthanite-coated lithium-rich manganese-based anode material

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Effect test

Embodiment 1

[0040] The preparation method of lanthanum oxide / lithium lanthanate coated lithium-rich manganese-based positive electrode material comprises the following steps:

[0041] (1) Preparation of lithium-rich manganese-based cathode materials

[0042] Weigh 0.0840mol lithium-rich manganese-based precursor Mn 4 / 6 Ni 1 / 6 co 1 / 6 CO 3 With 0.1302molLiOH. h 2 O was hand-milled and mixed (the amount of lithium was 5%), and the grinding time was 2h; then the above-mentioned raw materials were put into a crucible, placed in a muffle furnace, and heated to 500°C at a heating rate of 5°C / min in an air atmosphere Pre-sintering for 6h, then heating up to 900°C at a heating rate of 5°C / min and sintering for 10h, and then grinding for 1h after the furnace temperature was naturally cooled to room temperature to obtain a lithium-rich manganese-based positive electrode material 0.5Li 2 MnO 3 0.5Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 , with a particle size of about 10 μm.

[0043] (2) Preparatio...

Embodiment 2

[0048] The preparation method of lanthanum oxide / lithium lanthanate coated lithium-rich manganese-based positive electrode material comprises the following steps:

[0049] (1) Preparation of lithium-rich manganese-based cathode materials

[0050] Weigh 0.1680mol lithium-rich manganese-based precursor Mn 4 / 6 Ni 1 / 6 co 1 / 6 CO 3 with 0.1302molLi 2 CO 3 Carry out hand-grinding and mixing (the amount of excess lithium is 5%), and the grinding time is 3 hours; then put the above-mentioned raw materials into a crucible, put them in a muffle furnace, and in an air atmosphere, first raise the temperature to 500°C at a heating rate of 5°C / min for pre-treatment. Sinter for 6h, then heat up to 900°C for 10h at a heating rate of 5°C / min, and grind for 1.5h after the furnace temperature cools to room temperature to obtain a lithium-rich manganese-based positive electrode material 0.5Li 2 MnO 3 0.5Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 , and its particle size is about 10 μm.

[0051] (2)...

Embodiment 3

[0055] The preparation method of lanthanum oxide / lithium lanthanate coated lithium-rich manganese-based positive electrode material comprises the following steps:

[0056] (1) Preparation of lithium-rich manganese-based cathode materials

[0057] Weigh 0.0840mol lithium-rich manganese-based precursor Mn 4 / 6 Ni 1 / 6 co 1 / 6 CO 3 With 0.1302molLiOH. h 2 O was hand-milled and mixed (the amount of excess lithium was 5%), and the grinding time was 2h; then the above-mentioned raw materials were put into a crucible, placed in a muffle furnace, and the temperature was raised to 500°C at a heating rate of 5°C / min for 5h pre-sintering, and then Heat up to 900°C at a heating rate of 5°C / min and sinter for 10 hours, and then grind for 1 hour after the furnace temperature cools to room temperature to obtain a lithium-rich manganese-based positive electrode material 0.5Li 2 MnO 3 0.5Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 , and its particle size is about 10 μm.

[0058] (2) Preparation of l...

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Abstract

The invention discloses a preparation method of a lanthanum oxide / lithium lanthanite-coated lithium-rich manganese-based anode material; the preparation method comprises the following steps of (1) mixing a lithium-rich manganese-based precursor with a lithium source, calcining for one time, and cooling to obtain a lithium-rich manganese-based anode material; (2) dissolving a lanthanum source intoa solvent to prepare a solution A, and dispersing the obtained lithium-rich manganese-based anode material into a solvent to prepare a solution B, dropwise adding the solution A into the solution B under a stirring condition, carrying out a co-precipitation reaction, evaporating the solution to a gel shape after the reaction is completed, and obtaining a lanthanum oxide / lithium lanthanite-coated lithium-rich manganese-based anode material precursor; and (3) carrying out secondary sintering on the obtained lanthanum oxide / lithium lanthanite-coated lithium-rich manganese-based anode material precursor, and cooling to obtain the lanthanum oxide / lithium lanthanite-coated lithium-rich manganese-based anode material. The preparation process is simple, easy to operate and low in cost; and moreover, the synthesized composite material is excellent in electrochemical performance and stable in cycling performance.

Description

technical field [0001] The invention relates to the preparation of lithium-ion battery cathode materials, in particular to a preparation method for coating lithium-rich manganese-based cathode materials with lanthanum oxide / lithium lanthanate. Background technique [0002] At present, lithium-ion batteries are used in portable electronic devices, pure electric vehicles, and energy storage. High-performance cathode materials have become a bottleneck restricting the development of next-generation high-energy-density lithium-ion batteries. Therefore, the development of lithium-ion battery cathode materials with high capacity and long cycle life has become one of the current research hotspots. Among the known cathode materials, lithium-rich manganese-based cathode materials[ x Li 2 MnO 3 ·(1- x )LiMO 2 (0< x <1)] Discharge specific capacity up to 300 mAh g -1 , which is almost twice the actual capacity of the currently commercialized positive electrode materials. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/364H01M4/485H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 郑俊超杨书棋王鹏博贺振江汤林波
Owner CENT SOUTH UNIV
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