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Lithium-rich manganese-based solid solution positive electrode material for lithium ion battery and preparation method of lithium-rich manganese-based solid solution positive electrode material

A lithium-ion battery, lithium-rich manganese-based technology, used in battery electrodes, secondary batteries, circuits, etc., can solve the problems of non-compact particles, poor particle sphericity, and wide particle size distribution, and achieve narrow particle size distribution. The effect of good sphericity and dense particle interior

Active Publication Date: 2017-09-29
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the technical problems of poor particle sphericity, uncompacted inside of particles and wide particle size distribution in lithium-ion battery lithium-rich manganese-based solid solution positive electrode materials in the prior art, the present invention provides a lithium-rich manganese-based solid solution for lithium-ion batteries Solid solution cathode material and preparation method thereof

Method used

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  • Lithium-rich manganese-based solid solution positive electrode material for lithium ion battery and preparation method of lithium-rich manganese-based solid solution positive electrode material

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preparation example Construction

[0028] Specifically, the preparation method of lithium-rich manganese-based solid solution positive electrode material for lithium ion battery includes the following steps:

[0029] 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, 0.2≤a≤0.8, 0.1≤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.

[0030] Step B, while stirring, add the metal salt mixed solution and the carbonate solution with a concentration of 0.5-2.5 mol / L into the reaction...

Embodiment 1

[0041] A lithium-rich manganese-based solid solution cathode material for a lithium ion battery, the preparation method of which comprises the following steps:

[0042] 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.

[0043] Step b1, add deionized water into the reactor with stirring paddle, make the ionized water in the reactor submerge the paddle of the paddle, and then mix the metal salt solution with a concentration of 0.5 at a stirring speed of 800rpm The mol / L sodium carbonate solution is continuously fed into the reaction kettle in parallel flow, and the flow rate of the metal salt mixed solution and the sodium car...

Embodiment 2

[0051] A lithium-rich manganese-based solid solution cathode material for a lithium ion battery, the preparation method of which comprises the following steps:

[0052] Step a2, according to the general chemical formula of lithium-rich manganese-based solid solution positive electrode material 0.6Li 2 MnO 3 0.4LiNi 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.

[0053] Step b2, add deionized water in the reaction kettle with stirring paddle, make the ionized water in the reactor not pass the paddle of the stirring paddle, then under the stirring speed of 700rpm, mix the metal salt solution with a concentration of 2mol The sodium carbonate solution of / L continues to join in the reactor concurrently, control respectively described metal salt mixed solution and described...

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Abstract

The invention discloses a lithium-rich manganese-based solid solution positive electrode material for a lithium ion battery and a preparation method of the lithium-rich manganese-based solid solution positive electrode material. The chemical general formula of the lithium-rich manganese-based solid solution positive electrode material is xLi2MnO3.(1-x)LiNiCoMn<c>O2, wherein x is more than or equal to 0.2 but less than or equal to 0.7, (a+b+c) is equal to 1, a is more than or equal to 0.2 but less than or equal to 0.8, c is more than or equal to 0.1 but less than or equal to 0.5, the lithium-rich manganese-based solid solution positive electrode material is dense in particles, no hollow phenomenon exists, the tap density TD is larger than 2.0g / cm<3>, the particle size distribution coefficient K90 is 0.6-0.9, and K90=(D90-D10) / D50. The lithium-rich manganese-based solid solution positive electrode material has the advantages of good sphericity, dense particles and narrow particle size distribution, the capacity and the electrochemical performance of the lithium-rich manganese-based solid solution positive electrode material can be remarkably improved, and the cycle lifetime of the lithium-rich manganese-based solid solution positive electrode material can be remarkably prolonged; and moreover, according to the preparation method, a complexing agent does not need to use, and the preparation process is simple, is easy and stable to control, is low in production cost, is environmental-friendly, has no pollution and is suitable for industrial production on a large scale.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a lithium-rich manganese-based solid solution positive electrode material for lithium ion batteries 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 considere...

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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