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Surface-doped rich lithium cathode material and preparation method thereof

A technology of lithium-rich positive electrode material and surface doping, which is applied in the field of surface-doped lithium-rich positive electrode material and its preparation, can solve the problems of unfavorable rate discharge characteristics of electrode materials, no electrochemical activity of clad materials, etc., and achieve improved structure Stability, improve cycle performance, reduce the effect of side reactions

Active Publication Date: 2015-04-22
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the coating has no electrochemical activity, too thick or too dense coating is not good for the rate discharge characteristics of the electrode material.

Method used

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  • Surface-doped rich lithium cathode material and preparation method thereof
  • Surface-doped rich lithium cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] to xLi 2 MnO 3 ·(1-x)Li[Ni 0.5 mn 0.5 ]O 2 as the matrix, the surface is doped with Rh 3+ , doped with Rh 3+ The surface layer available xLi 2 MnO 3 ·(1-x)LiNi n mn m Rh 1-m-n o 2 Indicates that, where x=0.5, n=0.4, m=0.3, the molar ratio of lithium ions in solution A is measured twice as follows: 1:0.5, the specific operation steps are as follows:

[0023] (1) Configuration solution: Dissolve lithium nitrate and citric acid with a stoichiometric ratio of 1:1 in deionized water to make solution A, in which the lithium ion concentration is 0.50mol / L; 0.25mol nickel nitrate and 0.75mol manganese nitrate Dissolve in deionized water to make solution B; dissolve 0.10mol nickel nitrate, 0.325mol manganese nitrate and 0.075mol rhodium nitrate in deionized water to make solution C.

[0024] (2) Measure 3.00L of solution A, add solution B to 3.00L of solution A, stir at 60°C to form a gel, pre-calcine at 300°C, keep warm for 9 hours, cool naturally and grind to obtai...

Embodiment 2

[0027] to xLi 2 MnO 3 ·(1-x)Li[Ni 0.5 mn 0.5 ]O 2 as the matrix, the surface is doped with Rh 3+ , doped with Rh 3+ The surface layer available xLi 2 MnO 3 ·(1-x)LiNi n mn m Rh 1-m-n o 2 Said, where x=0.5, n=0.4, m=0.3, the following two times measure the molar ratio of lithium ions in solution A to be 1:1, the specific operation steps are as follows:

[0028] (1) Configuration solution: Dissolve lithium nitrate and citric acid with a stoichiometric ratio of 1:1 in deionized water to make solution A, in which the lithium ion concentration is 0.50mol / L; 0.25mol nickel nitrate and 0.75mol manganese nitrate Dissolve in deionized water to make solution B; dissolve 0.20mol nickel nitrate, 0.65mol manganese nitrate and 0.15mol rhodium nitrate in deionized water to make solution C.

[0029] (2) Measure 3.00L of solution A, add solution B to 3.00L of solution A, stir at 60°C to form a gel, pre-calcine at 300°C, keep warm for 9 hours, and then grind to obtain D.

[0030] (...

Embodiment 3

[0032] to xLi 2 MnO 3 ·(1-x)Li[Ni 0.5 mn 0.5 ]O 2 as the matrix, the surface is doped with Rh 3+ , doped with Rh 3+ The surface layer available xLi 2 MnO 3 ·(1-x)LiNin mn m Rh 1-m-n o 2 Said, where x=0.5, n=0.4, m=0.3, the following two times measure the molar ratio of lithium ions in solution A to be 1:1, the specific operation steps are as follows:

[0033] (1) Configuration solution: Dissolve lithium salt and citric acid with a stoichiometric ratio of 1:1 in deionized water to form solution A, in which the lithium salt is a mixture of lithium nitrate and lithium hydroxide with a stoichiometric ratio of 1:1, and lithium The ion concentration is 0.50mol / L; 0.25mol nickel nitrate and 0.75mol manganese nitrate are dissolved in deionized water to make solution B; 0.20mol nickel nitrate, 0.65mol manganese nitrate and 0.15mol rhodium nitrate are dissolved in deionized water to prepare into solution C.

[0034] (2) Measure 3.00L of solution A, add solution B to 3.00L of...

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Abstract

The invention relates to a surface-doped rich lithium cathode material and a preparation method thereof. The xLi2MnO3. (1-x)Li(Ni0.5Mn0.5)O2 is used as a matrix, the surface layer of the matrix is doped with Rh3+, and the surface layer doped with the Rh3+ can be represented by xLi2MnO3. (1-x)LiNinMnmRh1-m-n O2, wherein 0<x<1, 0<n<=0.5, and m<=0.5. By adopting the surface doping mode, the side reaction between a cathode material and electrolyte is lowered, and therefore the rate capacity of the cathode material is guaranteed, and the cycle performance of the cathode material is improved.

Description

technical field [0001] The invention relates to a lithium-ion battery cathode material, in particular to a surface-doped lithium-rich cathode material and a preparation method thereof. Background technique [0002] With the development of the times and the advancement of science and technology, the requirements for energy storage equipment in the fields of electronic products, electric vehicles, medical equipment and aerospace are increasing, and people's requirements for lithium-ion batteries are also getting higher and higher, which is specifically reflected in high-energy Density, small volume and high cycle times. Among them, the traditional cathode material LiCoO 2 Low capacity and high cost; while LiNiO 2 Harsh synthesis conditions, poor reversibility; relatively cheap LiFePO 4 Not only the ionic conductivity is poor, but also the actual discharge specific capacity is only 160mAh / g. These lithium-ion battery cathode materials are difficult to meet the needs of high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10
Inventor 彭家兴杨茂萍刘兴亮马守龙
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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