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Preparation method for lithium-rich manganese-based positive electrode material coated by phosphate polyanion composite manganese salt

A lithium-rich manganese-based, polyanion technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of poor rate performance and cycle performance of lithium-rich manganese-based positive electrode materials, and achieve improved electrical conductivity and ionization. Effects of transport performance, enhanced electrochemical performance, and improved cycle and rate performance

Active Publication Date: 2016-10-26
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the technical problem of poor rate performance and cycle performance of lithium-rich manganese-based positive electrode materials, and propose a preparation method for lithium-rich manganese-based positive electrode materials coated with phosphate polyanion composite manganese salt

Method used

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  • Preparation method for lithium-rich manganese-based positive electrode material coated by phosphate polyanion composite manganese salt
  • Preparation method for lithium-rich manganese-based positive electrode material coated by phosphate polyanion composite manganese salt
  • Preparation method for lithium-rich manganese-based positive electrode material coated by phosphate polyanion composite manganese salt

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Embodiment 1

[0029] A method for preparing a lithium-rich manganese-based positive electrode material coated with a phosphate polyanion composite manganese salt, comprising the following steps:

[0030] Step 1) The lithium-rich manganese-based cathode material used has a molecular formula of 0.5Li 2 MnO 3 0.5LiNi 0.4 mn 0.4 co 0.2 o 2 .

[0031] Step 2) 3wt% phosphate polyanion composite manganese salt coated lithium-rich manganese-based positive electrode material 0.5Li 2 MnO 3 0.5LiNi 0.4 mn 0.4 co 0.2 o 2 preparation of

[0032] According to the Mn:P molar ratio of 1:1, weigh 0.1021g of manganese acetate and 0.0479g of ammonium dihydrogen phosphate and dissolve them in 50mL of deionized water successively, add 0.2mol / L citric acid aqueous solution dropwise to adjust pH=4, and stir for 0.5 hours; according to the coating amount of 3wt% phosphate polyanion composite manganese salt, 5g of lithium-rich manganese-based positive electrode material should be added to the above solu...

Embodiment 2

[0037] A method for preparing a lithium-rich manganese-based positive electrode material coated with a phosphate polyanion composite manganese salt, comprising the following steps:

[0038] Step 1) The lithium-rich manganese-based cathode material used has a molecular formula of 0.5Li 2 MnO 3 0.5LiNi 0.4 mn 0.4 co 0.2 o 2 .

[0039] Step 2) 5wt% phosphate polyanion composite manganese salt coated lithium-rich manganese-based positive electrode material 0.5Li 2 MnO 3 0.5LiNi 0.4 mn 0.4 co 0.2 o 2 preparation of

[0040] According to the Mn:P molar ratio of 2:1, weigh 0.2025g of manganese acetate and 0.0475g of ammonium dihydrogen phosphate and dissolve them in 50mL of deionized water successively, add 0.2mol / L citric acid aqueous solution dropwise to adjust pH=5, and stir for 0.5 Hours; according to the phosphate polyanion composite manganese salt with a coating amount of 5wt%, 5g of lithium-rich manganese-based positive electrode materials should be added to the ab...

Embodiment 3

[0042] A method for preparing a lithium-rich manganese-based positive electrode material coated with a phosphate polyanion composite manganese salt, comprising the following steps:

[0043] Step 1) The lithium-rich manganese-based cathode material used has a molecular formula of 0.5Li 2 MnO 3 0.5LiNi 0.4 mn 0.4 co 0.2 o 2 .

[0044] Step 2) 10wt% phosphate polyanion composite manganese salt coated lithium-rich manganese-based positive electrode material 0.5Li 2 MnO 3 0.5LiNi 0.4 mn 0.4 co 0.2 o 2 preparation of

[0045] According to the Mn:P molar ratio of 3:4, weigh 0.3072g of manganese acetate and 0.1925g of ammonium dihydrogen phosphate and dissolve them in 50mL of deionized water successively, add 0.2mol / L citric acid aqueous solution dropwise to adjust pH=6, and stir for 0.5 hours; according to the coating amount of 10wt% phosphate polyanion composite manganese salt, 5 g of lithium-rich manganese-based positive electrode materials should be added to the above ...

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Abstract

The invention discloses a preparation method for a lithium-rich manganese-based positive electrode material coated by a phosphate polyanion composite manganese salt. The preparation method comprises the following steps: dissolving soluble phosphate and soluble manganese salt in water according to a mol ratio of elemental phosphorus and elemental manganese of 1: 0.2-5 so as to form an aqueous solution, carrying out stirring, and adding an acidic solution drop by drop for adjustment of a pH value; then adding a lithium-rich manganese-based positive electrode material and carrying out isothermal stirring so as to prepare a precursor solution; and carrying out drying and then carrying out calcining in a muffle furnace so as to obtain the lithium-rich manganese-based positive electrode material coated by the phosphate polyanion composite manganese salt. According to the invention, the phosphate polyanion composite manganese salt is used as a coating layer, so the surface structure of the lithium-rich manganese-based positive electrode material is improved, an electrode is isolated from an electrolyte, and the conductivity and ion transport performance of the electrode material and the electrolyte are improved; thus, the rate capability and cycle performance of the lithium-rich manganese-based positive electrode material is improved.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a preparation method for a lithium-rich manganese-based positive electrode material coated with phosphate polyanion composite manganese salt. technical background [0002] In recent years, with the development of science and technology, lithium-ion batteries have unique advantages such as high working voltage, high energy density, long cycle life, low self-discharge, no memory effect, no pollution, and good safety performance, while traditional cathode materials such as LiCoO 2 , LiMn 2 o 4 and LiFePO 4 Limited by cost and capacity factors, the development of new electrode materials with high performance and low cost has always been the main research direction of lithium-ion batteries. [0003] Lithium-rich manganese-based cathode material xLi 2 MnO 3 ·(1-x)LiMO 2 It has the advantages of high specific capacity and high voltage platform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 陈方高玉仙
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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