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Method for preparing layered lithium manganate positive electrode material through low lithium-manganese ratio doping

A technology of layered lithium manganate and cathode materials, applied in the direction of positive electrodes, battery electrodes, active material electrodes, etc., can solve the problems of low utilization rate of raw materials, irregular shape, uneven distribution, etc., to improve utilization rate, Uniform distribution and good crystallinity

Active Publication Date: 2021-02-26
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some of the preparation processes have gradually matured, but there are problems such as uneven distribution, cumbersome process, low utilization rate of raw materials, irregular shape, and low purity.

Method used

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  • Method for preparing layered lithium manganate positive electrode material through low lithium-manganese ratio doping
  • Method for preparing layered lithium manganate positive electrode material through low lithium-manganese ratio doping
  • Method for preparing layered lithium manganate positive electrode material through low lithium-manganese ratio doping

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Embodiment 1

[0036] This embodiment provides a method for preparing a layered lithium manganate doped with a low lithium-to-manganese ratio doped lithium battery positive electrode material, wherein the doping element is Ce, including the following steps:

[0037] (a) LiOH·H 2 O, Mn 2 O 3 and Ce(SO 4 ) 2 ·4H 2 O according to the molar ratio of 1:0.9:0.1, the ball-to-material ratio of 6:1, and the ball mill mixing at a rotational speed of 120 rpm to obtain a product containing Ce element;

[0038] (b) The product containing Ce element and KOH are added to deionized water and mixed to form a mixed solution with pH=13.91, and then the mixed solution is put into a homogeneous reactor, and a catalyst liquid ammonia is added to perform a homogeneous catalytic reaction. Homogeneous catalysis The reaction temperature was 180°C, the reaction time was 10h, and the speed of the homogeneous reactor was 5 rpm;

[0039] (c) Washing and drying the product after homogeneous catalytic reaction to fin...

Embodiment 2

[0041] The present embodiment provides a method for preparing a layered lithium manganate doped with a low lithium-to-manganese ratio doped lithium battery positive electrode material. The doping element is Fe, including the following steps:

[0042] (a) LiOH·H 2 O, Mn 2 O 3 and Fe 2 O 3 According to the molar ratio of 1:0.9:0.1, the ball-to-material ratio of 6:1, and the rotation speed of 120 r / min, the ball-milling mixture is mixed to obtain a product containing Fe element;

[0043] (b) The product containing Fe element and NaOH are added to deionized water and mixed to form a mixed solution with pH=13.93, and then the mixed solution is put into a homogeneous reactor, and a catalyst liquid ammonia is added to perform a homogeneous catalytic reaction. Homogeneous catalysis The reaction temperature was 180°C, the reaction time was 10h, and the speed of the homogeneous reactor was 5 rpm;

[0044] (c) Washing and drying the product after homogeneous catalytic reaction to fi...

Embodiment 3

[0046] The present embodiment provides a method for preparing a layered lithium manganate doped with a low lithium-manganese ratio doped lithium battery positive electrode material, wherein the doping element is Sr, and the method includes the following steps:

[0047] (a) LiOH·H 2 O, Mn 2 O 3 and SrCO 3 According to the molar ratio of 1:0.9:0.1, the ball-to-material ratio of 6:1, and the rotation speed of 120 r / min, the ball mill mixes to obtain a product containing Sr element;

[0048] (b) The product containing Sr element and NaOH are added to deionized water and mixed to form a mixed solution with pH=13.97, and then the mixed solution is put into a homogeneous reactor, and a catalyst liquid ammonia is added to perform a homogeneous catalytic reaction. Homogeneous catalysis The reaction temperature was 180°C, the reaction time was 10h, and the speed of the homogeneous reactor was 5 rpm;

[0049] (c) Washing and drying the product after homogeneous catalytic reaction to ...

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Abstract

The invention relates to a method for preparing a layered lithium manganate positive electrode material through low lithium-manganese ratio doping, and belongs to the technical field of lithium ion batteries. The preparation method specifically comprises the following steps: ball-milling and mixing a lithium source, a manganese source and a doped element source according to a molar ratio of 1-1.1:0.85-0.95: 0.05-0.15; putting the ball-milled and mixed product and a process control agent into a solution, mixing to form a mixed solution, putting the mixed solution into a homogeneous reactor, and adding a catalyst to perform homogeneous catalytic reaction at the same time; and washing and drying a product obtained after the homogeneous catalytic reaction to finally obtain o-LiMxMn1-xO2. According to the invention, the lithium-manganese molar ratio of the raw materials is reduced, an environment is good, operation is simple, the electrochemical performance of the product can be effectively improved by element doping of the positive electrode material o-LiMnO2, and the method can be widely applied to the technical field of battery materials.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing a layered lithium manganate positive electrode material by doping with a low lithium-manganese ratio. Background technique [0002] Lithium-ion batteries are the fastest-growing high-energy storage devices in the industrial field, and the development of electrode materials is the key to the development of lithium-ion batteries. Reducing battery costs and improving battery performance are important indicators for the development of lithium-ion batteries. [0003] LiMnO cathode material for lithium ion battery 2 Mainly includes the orthorhombic structure ( m -LiMnO 2 ) and the orthogonal structure ( o -LiMnO 2 ). m -LiMnO 2 The crystal structure belongs to the monoclinic system. In the crystal structure, the oxygen atoms are arranged in a cubic close-packed arrangement, and the Li + and Mn 3+ Located in an octahedral layer parallel to th...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M10/0525H01M2004/028Y02E60/10
Inventor 郝晓剑张卫俊潘保武张淑琴张卫琦
Owner ZHONGBEI UNIV