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Surface modification method for composite lithium nickel manganese oxide positive electrode material

A technology of lithium nickel manganate and cathode material, which is applied in the field of surface modification of composite lithium manganate cathode material, can solve problems such as affecting electrochemical performance, improve rate and cycle performance, maintain stable structure, and simple process Effect

Inactive Publication Date: 2018-02-09
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, this material still has the following disadvantages, such as: in the process of preparing the material, Li x Ni 1-x O heterogeneous phase; when the charge and discharge voltage is higher than 4.8V, the electrolyte is prone to decomposition and the metal ions in the material are dissolved in the electrolyte containing HF, which will directly affect the LiMn 1.5 Ni 0.5 o 4 electrochemical performance

Method used

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  • Surface modification method for composite lithium nickel manganese oxide positive electrode material
  • Surface modification method for composite lithium nickel manganese oxide positive electrode material
  • Surface modification method for composite lithium nickel manganese oxide positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) Press Li: Mn: Ni: The element molar ratio of Y is 1:1.495:0.495:0.01, accurately weigh lithium hydroxide, manganese nitrate, nickel nitrate, yttrium nitrate and dissolve in deionized water respectively to form a solution, then Add lithium hydroxide solution, manganese nitrate solution, nickel nitrate solution and yttrium nitrate solution to the citric acid solution drop by drop. After stirring for 2 hours, add ammonia water dropwise to keep the pH value of the mixed solution at 7. Under stirring conditions, heat the mixed solution to 80°C until the sol is formed, and then keep the obtained sol at 100°C for 12 hours to form a xerogel; pre-calcine the xerogel in a muffle furnace at 300°C for 8 hours, and after grinding, heat-treat at 800°C for 10 hours. Obtain yttrium-doped lithium nickel manganese oxide material LiMn 1.495 Ni 0.495 Y 0.01 o 4;

[0028] (2) Set [Y 1-x Mg x ][Cr 1-x-y sn y Ga z ]O 3 The yttrium-doped lithium nickel manganese oxide material wa...

Embodiment 2

[0034] (1) Press Li: Mn: Ni: The element molar ratio of Y is 1:1.475:0.475:0.05, accurately weigh lithium acetate, manganese sulfate, nickel sulfate, yttrium sulfate, and dissolve in deionized water respectively to form a solution, then Add lithium acetate solution, manganese sulfate solution, nickel sulfate solution and yttrium sulfate solution to the citric acid solution drop by drop, after stirring for 3 hours, add ammonia water dropwise to keep the pH value at 8, and heat the mixed solution to 80°C while stirring , until the sol is formed, and then the obtained sol is kept at 110°C for 15h to form a xerogel, and the obtained xerogel is pre-fired in a muffle furnace at 400°C for 7h, and after grinding, it is heat-treated at 800°C for 7h to obtain Yttrium-doped lithium nickel manganese oxide material;

[0035] (2) Set [Y 1-x Mg x ][Cr 1-x-y sn y Ga z ]O 3 The yttrium-doped lithium nickel manganese oxide material was dispersed in deionized water at a mass ratio of 0.05:...

Embodiment 3

[0037] (1) According to the element molar ratio of Li:Mn:Ni:Y as 1:1.49:0.49:0.02, accurately weigh lithium nitrate, manganese chloride, nickel chloride, and yttrium chloride, and dissolve them in deionized water to form a solution , then lithium nitrate solution, manganese chloride solution, nickel chloride solution, and yttrium chloride solution were added dropwise to the citric acid solution, and after stirring for 4 hours, ammonia water was added dropwise to keep the pH value at 8. Under stirring conditions, the mixed The solution was heated to 60°C until the sol was formed, and then the obtained sol was kept at 120°C for 20 hours to form a xerogel; the xerogel was pre-fired in a muffle furnace at 450°C for 7 hours, and after grinding, it was heat-treated at 850°C 8h just obtains yttrium-doped lithium nickel manganese oxide material;

[0038] (2) Set [Y 1-x Mg x ][Cr 1-x-y sn y Ga z ]O 3 The yttrium-doped lithium nickel manganese oxide material was dispersed in deion...

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Abstract

The invention discloses a surface modification method for a composite lithium nickel manganese oxide positive electrode material. The method comprises the following steps of dissolving a lithium source, a manganese source, a nickel source and a yttrium source into deionized water to form solutions separately, dropwise adding various solutions into a citric acid solution separately, stirring to form a mixed solution, adjusting the pH value and carrying out heating to form dried gel; pre-sintering and grinding the dried gel and carrying out thermal treatment to form a yttrium-doped lithium nickel manganese oxide material; and dispersing [Y<1-x>Mg<x>][Cr<1-x-y>Sn<y>Ga<z>]O3 and the yttrium-doped lithium nickel manganese oxide material into the deionized water at a mass ratio of 0.05:1, stirring to form a mixture and carrying out washing, filtering and annealing treatment to obtain the coated yttrium-doped lithium nickel manganese oxide positive electrode material. The structure stability,the high-temperature conductivity and the cycle performance of the material are improved, side reaction of the material and an electrolyte and dissolution of metal ions can be suppressed, and the interface stability of the material is improved.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material, in particular to a method for surface modification of a composite lithium nickel manganese oxide cathode material. Background technique [0002] High power and high energy density are key factors for lithium-ion batteries to be used in hybrid electric vehicles and plug-in hybrid electric vehicles. Therefore, in recent years, exploring materials with high power and high energy density to improve the performance of lithium-ion batteries has attracted much attention. LiMn with a spinel structure at 4V as a conventional charge-discharge platform 2 o 4 and layered LiCoO 2 and LiFePO with olivine structure 4 Lithium-ion battery cathode material compared to LiMn 1.5 Ni 0.5 o 4 The charging and discharging platform is 4.7V, and it has very good cycle performance, low price, environmental friendliness and good thermal stability. It is currently a very promising cathode material for lithium-...

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
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 万宁杨茂萍李道聪
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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