High-capacity lithium ion battery gradient cathode material and preparation method thereof

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of complex preparation process, difficulty in promotion, and poor battery cycle performance, so as to improve structural stability and improve Safety and electrochemical performance, effect of good coating effect

Inactive Publication Date: 2014-02-05
NANTONG RESHINE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Whether the first charge-discharge capacity, charge-discharge coulombic efficiency, cycle performance, or discharge plateau voltage of the synthesized gradient positive electrode material are higher than the homogeneous material synthesized from the precursor obtained by the ordinary co-precipitation method, the synthesis adopts the fractional co-precipitation method to prepare The process is relatively complicated, and it is difficult to promote it in pr...

Method used

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  • High-capacity lithium ion battery gradient cathode material and preparation method thereof
  • High-capacity lithium ion battery gradient cathode material and preparation method thereof
  • High-capacity lithium ion battery gradient cathode material and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0029] Embodiment 1: as figure 1 . A high-capacity lithium-ion battery graded cathode material shown in 2.3 and 4 contains a cobalt source material, a lithium source material, a dopant M and a coating material, wherein the molar ratio of Li: Co is 1.08, and the dopant M The dosage of the coating material is 0.1wt%, and the dosage of the cladding material is 10wt%.

[0030] Its preparation method comprises the following steps:

[0031] (1) Using battery-grade cobalt oxyhydroxide (D50 is 13 μm), battery-grade lithium hydroxide, magnesium oxide, and aluminum oxide as raw materials, the molar ratio of Li:Co is 1.08, the addition of aluminum is 0.1 wt%, and the addition of magnesium The amount is 1.5 wt%, placed in a dry mixer and mixed evenly.

[0032](2) In a wet environment, combine a mixed solution of Ni, Co, and Mn salts with a concentration of 0.5-3mol / L, a NaOH solution with a concentration of 1-10mol / L, and a complexing agent solution of 0.5-200g / L Put it into the ...

Embodiment 2

[0037] (1) Using battery-grade cobalt oxide (D50 is 20 μm), battery-grade lithium hydroxide, magnesium oxide, and zirconia as raw materials, the molar ratio of Li:Co is 0.95, the addition of zirconium is 4.5 wt%, and the addition of magnesium 5.5 wt%, placed in a dry mixer and mixed evenly.

[0038] (2) Put the materials in step (1) and the coating material N with a dosage of 0.01 wt% into the dry coating equipment for coating. The coating material N is a mixture of nickel oxide, tricobalt tetroxide, manganese tetraoxide, and lithium hydroxide and lithium carbonate, wherein the molar ratio of Ni:Co:Mn is 7:1.5:1.5, and the molar ratio of Li to metal nickel, cobalt, and manganese The ratio is 0.95.

[0039] (3) Sinter the materials processed in step (2). The main temperature of sintering is 550°C, and the sintering time in the main temperature zone is 40h. 3 / h, the sintered material is crushed, pulverized, and classified to obtain a semi-finished product of lithium cobalta...

Embodiment 3

[0044] (1) Use battery-grade cobalt oxide (D50 is 20 μm), battery-grade lithium hydroxide, and titanium oxide as raw materials, the molar ratio of Li:Co is 1.2, and the addition of titanium is 0.01 wt%, and placed in a dry mixer well mixed.

[0045] (2) In a wet environment, a mixed solution of Ni, Co, and Mn salts with a concentration of 0.5-3 mol / L, a NaOH solution with a concentration of 1-10 mol / L, and a complexing agent solution of 0.5-200 g / L Add them together into the reaction vessel, control the appropriate temperature, pH value and stirring conditions, and then go through drying, iron removal, classification, sieving and other processes to obtain the substance N with a D50 of 1.5 μm (the molecular composition is Ni 0.8 mn 0.1 co 0.1 (OH) 2 ).

[0046] (3) Put the mixture in step (1) and the coating material N of 0.01 wt% into the dry coating equipment for coating. Among them, the coating material is a mixture of substance N (N is the substance synthesized i...

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Abstract

The invention discloses a high-capacity lithium ion battery gradient cathode material and a preparation method of the material. The high-capacity lithium ion battery gradient cathode material contains a cobalt source substance, a lithium source material, a doping agent M and a cladding material, wherein the molar ratio of Li to Co is 0.95-1.2; the doping amount of the doping agent M is 0.01-10wt%, and the doping amount of the clad material is 0.01-20wt%. The high-capacity lithium ion battery gradient cathode material and the preparation method of the material solve the problems in the prior art; the high-capacity lithium ion battery gradient cathode material not only improves the structural stability of core material lithium cobalt oxide, but also improves the stability of shell material, and reduces the difference between resistance and discharge potential of the shell material and the core material so that the shell material and the core material reach a more consistent level on the aspect of Li+ deintercalation; secondly, the active substance is coated on the raw material, so that the complementary advantages between the core material lithium cobalt oxide and the shell material can be realized; furthermore, Co has continuous concentration change from the core material to the shell material, so that the cladding function is fully exerted, the material structure is stabilized, and the safety and the electrochemical performance of the material are improved.

Description

[0001] technical field [0002] The invention relates to the fields of energy storage materials and electrochemistry, in particular to a gradient cathode material for a high-capacity lithium-ion battery and a preparation method thereof. Background technique [0003] As a cathode material for lithium-ion batteries, lithium cobalt oxide has the advantages of high working voltage, high energy density, easy synthesis and fast charge and discharge, so it is widely used. However, due to the structural defects of lithium cobalt oxide itself, the following problems have been caused. When the charging cut-off voltage of lithium-ion batteries is higher than 4.2V, a large amount of Co in the lithium cobalt oxide structure 3+ will become Co 4+ ,Co 4+ The existence of will lead to the formation of oxygen vacancies in the lithium cobalt oxide crystal form, thereby weakening the binding force between the transition metal Co and oxygen, making Co 4+ Dissolved in the electrolyte, thereby...

Claims

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Application Information

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IPC IPC(8): H01M4/52H01M4/1391H01M4/131
CPCY02E60/122H01M4/366H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 李兴翠池田一崇尹雄鸽王文博高林周贵海
Owner NANTONG RESHINE NEW MATERIAL
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