Doped lithium nickel manganese oxide material, modified lithium nickel manganese oxide positive electrode material and preparation method thereof

A technology of lithium nickel manganese oxide and positive electrode materials, which is applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve problems affecting electrochemical performance, etc., and achieve the effects of improving material interface stability, inhibiting dissolution, and simple operation

Active Publication Date: 2020-07-17
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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  • Doped lithium nickel manganese oxide material, modified lithium nickel manganese oxide positive electrode material and preparation method thereof
  • Doped lithium nickel manganese oxide material, modified lithium nickel manganese oxide positive electrode material and preparation method thereof
  • Doped lithium nickel manganese oxide material, modified lithium nickel manganese oxide positive electrode material and preparation method thereof

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Embodiment 1

[0034] A preparation method for a doped lithium nickel manganese oxide material, comprising the steps of: dropwise adding lithium source aqueous solution, manganese source aqueous solution, nickel source aqueous solution, and yttrium source aqueous solution to an aqueous citric acid solution, stirring for 3.5 hours, adjusting the pH to 7.5, and raising the temperature Stir until a sol is formed, dry to obtain a xerogel; pre-calcine the xerogel, grind, and heat treat to obtain LiMn doped nickel manganese oxide material LiMn 1.485 Ni 0.485 Y 0.03 o 4 .

[0035] A preparation method of a modified lithium nickel manganese oxide positive electrode material, comprising the steps of: making Li 2 SnO 3 Add the above-mentioned doped lithium nickel manganese oxide material into water and mix evenly, stir to form a precipitate, take the precipitate for annealing treatment, wash, and dry to obtain a modified lithium nickel manganese oxide positive electrode material.

Embodiment 2

[0037] A preparation method for doped lithium nickel manganese oxide material, comprising the steps of: dropwise adding lithium hydroxide aqueous solution, manganese nitrate aqueous solution, nickel nitrate aqueous solution, and yttrium nitrate aqueous solution to citric acid aqueous solution, stirring for 2 hours, and adjusting pH=7 with ammonia water , heat up to 80°C, stir until a sol is formed, heat up to 100°C, and dry for 12 hours to obtain dry gel; heat up to 350°C, pre-calcine the dry gel for 6 hours, grind, heat up to 800°C, and keep warm for 5 hours to obtain doped nickel-manganese Lithium acid material LiMn 1.495 Ni 0.495 Y 0.01 o 4 , wherein the molar ratio of lithium, manganese, nickel, and yttrium elements is 1:1.495:0.495:0.01, and the amount of citric acid is 1% of the theoretically generated weight of the doped lithium nickel manganese oxide material.

[0038] A preparation method of a modified lithium nickel manganese oxide positive electrode material, com...

Embodiment 3

[0040]A preparation method for doped lithium nickel manganese oxide material, comprising the steps of: dropwise adding lithium acetate aqueous solution, manganese sulfate aqueous solution, nickel sulfate aqueous solution, and yttrium sulfate aqueous solution to citric acid aqueous solution, stirring for 3 hours, adjusting pH=7 with ammonia water, Heat up to 80°C, stir until a sol is formed, heat up to 110°C, and dry for 15 hours to obtain dry gel; heat up to 400°C, pre-calcine the dry gel for 7 hours, grind, heat up to 800°C, and keep warm for 7 hours to obtain doped nickel manganese acid Lithium material LiMn 1.475 Ni 0.475 Y 0.05 o 4 , wherein the molar ratio of lithium, manganese, nickel, and yttrium is 1:1.475:0.475:0.05, and the amount of citric acid is 10% of the theoretically generated weight of the doped lithium nickel manganese oxide material.

[0041] A preparation method of a modified lithium nickel manganese oxide positive electrode material, comprising the step...

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Abstract

The invention discloses a doped lithium nickel manganate material having the chemical composition of LiMn<1.5-x>Ni<0.5-x>Y<2x>O<4>. The invention discloses a modified lithium nickel manganate positiveelectrode material. The invention also discloses a preparation method the doped lithium nickel manganate material and a preparation of the modified lithium nickel manganate positive electrode material. A sol-gel method is adopted to prepare the doped lithium nickel manganate material with uniform grain diameter; the surface of the doped lithium nickel manganate material is uniformly coated with Li<2>SnO<3> to obtain the modified lithium nickel manganate positive electrode material which has high structural stability, cycle performance and thermal stability; and the preparation methods are simple in operation.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a doped lithium nickel manganese oxide material, a modified lithium nickel manganese oxide positive electrode material and a preparation method thereof. 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 as a very promising positive electrode material, it has very good cycle performance (does not have and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 万宁杨茂萍李道聪
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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