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Positive electrode lithium supplementing material, preparation method thereof and lithium ion battery

A lithium supplementation and positive electrode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of high gas production ratio, and achieve the effects of avoiding gelation, reducing the amount of residual alkali, and avoiding agglomeration

Active Publication Date: 2022-07-05
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the above-mentioned technical problems, the present invention provides a positive electrode lithium supplement material and a preparation method thereof and a lithium ion battery, and obtains a positive electrode lithium supplement material with internal doping and external cladding structure; modified by metal doping, It solves the problem of high gas production ratio when lithium ferrite is used as a positive electrode lithium supplement; by coating a layer of alumina coating on the surface of the lithium supplement active material, the amount of residual alkali on the surface of the material is reduced, and the positive electrode slurry is avoided. Agglomeration occurs in the material, which affects the safety of lithium-ion batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] This embodiment provides a positive electrode lithium supplement material, the D of the positive electrode lithium supplement material is 50 is 3 μm, and the positive electrode lithium supplement material includes the active material Li 5 Fe 0.995 Mn 0.005 O 4 and a surface coating comprising Al 2 O 3 and C; Al 2 O 3 with Li 5 Fe 0.995 Mn 0.005 O 4 The molar ratio of carbon is 0.02; the mass of the carbon accounts for 2.5 wt % of the positive electrode lithium supplement material.

[0079] The preparation method of the positive electrode lithium supplement material includes:

[0080](1) heating the solution containing anhydrous lithium hydroxide, ferric nitrate and manganese chloride whose molar ratio is Li:Fe:Mn=5:0.995:0.005 under the condition of 75°C for 35min, the lithium source in the solution is heated for 35min. The concentration is 1 mol / L, and the heated solution is spray-dried to obtain a mixture precursor, and the mixture precursor is sintered tw...

Embodiment 2

[0087] This embodiment provides a positive electrode lithium supplement material, the D of the positive electrode lithium supplement material is 50 is 2 μm, and the positive electrode lithium supplement material includes the active material Li 5 Fe 0.999 Mn 0.001 O 4 and a surface coating comprising Al 2 O 3 and C; Al 2 O 3 with Li 5 Fe 0.999 Mn 0.001 O 4 The molar ratio is 0.1. The mass of the carbon accounts for 5 wt % of the positive electrode lithium supplement material.

[0088] The preparation method of the positive electrode lithium supplement material includes:

[0089] (1) heating the solution containing lithium hydroxide monohydrate, ferrous nitrate and manganese sulfate whose molar ratio is Li:Fe:Mn=5:0.999:0.001 under the condition of 45°C for 60min, the lithium source in the solution is heated for 60min. The concentration is 0.5mol / L, and the heated solution is spray-dried to obtain a mixture precursor, and the mixture precursor is sintered twice. Th...

Embodiment 3

[0096] This embodiment provides a positive electrode lithium supplement material, the D of the positive electrode lithium supplement material is 50 is 2.5 μm, and the positive electrode lithium supplement material includes the active material Li 5 Fe 0.99 Mn 0.01 O 4 and a surface coating comprising Al 2 O 3 and C; Al 2 O 3 with Li 5 Fe 0.99 Mn 0.01 O 4 The molar ratio of carbon is 0.01; the mass of the carbon accounts for 0.5 wt % of the positive electrode lithium supplement material.

[0097] The preparation method of the positive electrode lithium supplement material includes:

[0098] (1) to the solution containing lithium carbonate, ferric chloride and manganese nitrate whose molar ratio is Li:Fe:Mn=5:0.99:0.01 and heated for 10min at 98°C, the concentration of lithium source in the solution is 2mol / L, spray-drying the heated solution to obtain a mixture precursor, sintering the mixture precursor twice, the first sintering is performed in an air atmosphere, t...

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Abstract

The invention relates to a positive electrode lithium supplementing material, a preparation method thereof and a lithium ion battery, and the preparation method comprises the following steps: (1) heating, drying and sintering a solution containing a lithium source, an iron source and a doped metal source to obtain an LFMO precursor; and (2) mixing aluminum sol and the LFMO precursor obtained in the step (1), and calcining to obtain the positive electrode lithium supplementing material. According to the preparation method of the positive electrode lithium supplementing material provided by the invention, the positive electrode lithium supplementing material with an internal doping and external coating structure is obtained; modification is carried out by doping metal, so that the problem that the gas production proportion is relatively high when lithium ferrite is used as a positive electrode lithium supplementing agent is solved; the surface of the lithium supplement agent active material is coated with the aluminum oxide coating layer, so that the residual alkali amount on the surface of the material is reduced, and the influence on the safety of the lithium ion battery caused by agglomeration in positive electrode slurry is avoided.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and relates to a preparation method of a positive electrode lithium supplement material, in particular to a positive electrode lithium supplement material and a preparation method thereof, and a lithium ion battery. Background technique [0002] At present, the commonly used lithium-ion anode material is graphite, and its capacity has reached its limit. In order to improve the energy density of the battery, silicon-based anode materials with high specific capacity have become the most potential anode materials for next-generation commercial lithium-ion batteries. However, the silicon-based negative electrode has serious volume effect and low first Coulomb efficiency during the charging and discharging process. However, the first Coulomb efficiency of the positive electrode material is much higher than that of the negative electrode. Therefore, the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/48H01M4/131H01M4/1391H01M10/0525
CPCH01M4/366H01M4/485H01M4/483H01M4/131H01M4/1391H01M10/0525H01M2004/028Y02E60/10
Inventor 熊后高
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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