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Sodium-doped lithium-rich manganese-based solid solution anode material and preparation method thereof

A lithium-rich manganese-based, cathode material technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of rapid capacity decay, poor cycle performance, low capacity, etc., to avoid poor doping consistency, improve Effects on capacity and cycle performance

Active Publication Date: 2017-09-19
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] In order to solve the technical problems of low capacity, fast capacity fading, and poor cycle performance of lithium-rich manganese-based solid solution cathode materials in the prior art, the present invention provides a sodium-doped lithium-rich manganese-based solid solution cathode material and a preparation method thereof , can realize the uniform doping of sodium element, effectively improve the capacity and cycle performance of the positive electrode material

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  • Sodium-doped lithium-rich manganese-based solid solution anode material and preparation method thereof
  • Sodium-doped lithium-rich manganese-based solid solution anode material and preparation method thereof
  • Sodium-doped lithium-rich manganese-based solid solution anode material and preparation method thereof

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preparation example Construction

[0027] Specifically, the preparation method of the sodium-doped lithium-rich manganese-based solid solution positive electrode material comprises the following steps:

[0028] Step A, according to the general chemical formula xLi of the lithium-rich manganese-based solid solution cathode material 2 MnO 3 ·(1-x)LiNi a co b mn c o 2 Manganese, nickel and cobalt molar ratio in the manganese, nickel and cobalt salts are mixed together to prepare a metal salt mixed solution with a total concentration of metal ions of 0.5 to 3 mol / L; wherein, 0.2≤x≤0.7, a +b+c=1, 0.3≤a≤0.7, 0.2≤c≤0.5. In practical application, the anion of the metal salt mixed solution is at least one of sulfate ion, hydrochloride ion, nitrate ion, acetate ion, that is to say, these metal salts can be sulfate, hydrochloride , nitrate, acetate at least one.

[0029]Step B, using a sodium carbonate solution with a concentration of 0.5-2.5 mol / L as a precipitating agent, adding the metal salt mixed solution and ...

Embodiment 1

[0039] A sodium-doped lithium-rich manganese-based solid solution positive electrode material, the preparation method of which comprises the following steps:

[0040] Step a1, according to the general chemical formula of lithium-rich manganese-based solid solution positive electrode material 0.4Li 2 MnO 3 0.6LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The molar ratio of manganese, nickel and cobalt in the mixture is mixed together with manganese chloride, nickel sulfate and cobalt chloride to prepare a metal salt mixed solution with a total concentration of metal ions of 3mol / L.

[0041] Step b1, using a sodium carbonate solution with a concentration of 0.5mol / L as a precipitating agent, adding deionized water in a reactor with a stirring paddle, so that the ionized water in the reactor has not passed the paddle of the stirring paddle, and then at 800rpm Under the stirring speed, the metal salt mixed solution and the precipitating agent are continuously added to the reaction kettle in p...

Embodiment 2

[0050] A sodium-doped lithium-rich manganese-based solid solution positive electrode material, the preparation method of which comprises the following steps:

[0051] Step a2, according to the general chemical formula of lithium-rich manganese-based solid solution positive electrode material 0.2Li 2 MnO 3 0.8LiNi 0.5 co 0.2 mn 0.3 o 2 The molar ratio of manganese, nickel and cobalt in the solution is mixed together with manganese sulfate, nickel sulfate and cobalt sulfate to prepare a metal salt mixed solution with a total concentration of metal ions of 2mol / L.

[0052] Step b2, using the sodium carbonate solution with a concentration of 1.5mol / L as a precipitant, adding deionized water in a reactor with a stirring paddle, so that the ionized water in the reactor has not passed the paddle of the stirring paddle, and then at 700rpm Under the stirring speed, the metal salt mixed solution and the precipitating agent are continuously added to the reactor in parallel flow, and...

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Abstract

The invention discloses a sodium-doped lithium-rich manganese-based solid solution anode material and a preparation method thereof. In the sodium-doped lithium-rich manganese-based solid solution anode material, a mass content of the doped sodium element is 0.1% to 1%; furthermore, the sodium element is evenly distributed in particles of the lithium-rich manganese-based solid solution anode material; a chemical general formula of the lithium-rich manganese-based solid solution anode material is xLi2MnO3.(1-x)LiNiaCobMncO2, wherein the x is smaller than or equal to 0.7 and larger than or equal to 0.2, the a plus b plug c is equal to 2, the a is smaller than or equal to 0.7 and larger than or equal to 0.3, and the c is smaller than or equal to 0.5 and larger than or equal to 0.2. According to the sodium-doped lithium-rich manganese-based solid solution anode material disclosed by the invention, even doping of the sodium element is achieved, and capacity and circulation performance of the anode material are effectively improved.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a sodium-doped lithium-rich manganese-based solid solution positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion battery is a chemical power source with high energy density, cyclic charge and discharge, environmental friendliness, and no memory effect. It is one of hybrid and pure electric power sources. At present, several commonly used cathode materials for lithium-ion batteries (such as: LiCoO 2 , LiPeO 4 and LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 etc.) cannot meet the requirements of lithium-ion batteries for high energy density, especially cannot meet the requirements of lithium-ion batteries for electric vehicles. Lithium-rich manganese-based solid solution cathode material xLi 2 MnO 3 ·(1-x)LiMO 2 (M = at least one of Co, Ni, Mn) has a high specific capacity, so it is considered to be one o...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/364H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 宋顺林刘亚飞陈彦彬
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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