Single-crystal type multi-element positive electrode material as well as preparation method and application thereof

Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a single crystal type multi-element positive electrode material and a preparation method and application thereof. The positive electrode material meets the following conditions: the single crystal sizes DPS90, DPS10 and DPS50 of the positive electrode material measured by SEM meet the following relation: 0.1 < = B90 = (DPS90-DPS10) / DPS50 < = 1.5; the agglomeration rate of the positive electrode material is less than or equal to 20%; wherein 90% of the single crystal size of the DPS90 positive electrode material is smaller than that of DPS90; the single crystal size of the DPS50 positive electrode material is 50% smaller than that of DPS50; the single crystal size of the DPS10 positive electrode material is 10% smaller than that of DPS10. The single crystal type multi-element positive electrode material is round and full in morphology, uniform in particle size, less in agglomeration, less in adhesion, high in compaction density and good in structural stability, and when the single crystal type multi-element positive electrode material is applied to the lithium ion battery, the energy density, the rate capability, the cycling stability and the safety of the lithium ion battery can be improved.

Description

technical field

[0001] The invention relates to the technical field of lithium ion batteries, in particular to a single crystal multi-element positive electrode material and a preparation method and application thereof. Background technique

[0002] Energy and environmental issues have always been hot spots in today's society. With the expansion of my country's new energy vehicle market, the demand for power lithium-ion batteries has risen sharply, and the rapid development of mobile phones, cameras, electric vehicles, power tools and other industries has also increased the demand for lithium-ion batteries. Therefore, the lithium-ion battery industry has good development prospects.

[0003] Lithium-ion batteries have the advantages of high energy density, zero pollution, zero emissions and small size. As the main component of lithium-ion batteries, the positive electrode material plays a decisive role in the capacity, performance and cost of the battery. The ternary materia...

Examples

preparation example Construction

[0056] In the preparation method of the single crystal multi-element cathode material of the present invention, the mixture of the precursor material and the lithium salt is subjected to two high-temperature sintering processes.

[0057] The temperature of the second high-temperature sintering is 20-200°C higher than that of the first high-temperature sintering to ensure that the positive electrode material process product I is obtained through the first high-temperature sintering.

[0058] A second aspect of the present invention provides a method for preparing a single crystal multi-element cathode material, characterized in that the method comprises the following steps:

[0059] S1, the nickel cobalt manganese hydroxide precursor, lithium source, optionally dopant D are mixed to obtain mixture I;

[0060] S2, in oxygen or air atmosphere, carry out the first high temperature sintering to described mixture I, obtain positive electrode material process product I;

[0061] S3,...

Embodiment 1

[0142] I: Preparation of nickel cobalt manganese hydroxide precursors

[0143] (1) Using nickel sulfate, cobalt sulfate, and manganese sulfate as raw materials, according to the molar ratio of Ni:Co:Mn=80:10:10, a uniform nickel, cobalt, and manganese salt mixed solution of 2mol / L is prepared, and 0.2mol / L is prepared. L's La 2 (SO 4 ) 3 solution, 8mol / L NaOH solution was prepared as a precipitating agent, and 25wt% ammonia water was directly used as a complexing agent.

[0144] (2) Under the protection of nitrogen, the above solution was passed into the reactor in a co-current manner, controlled [n(Ni)+n(Co)+n(Mn)]: n(La)=1:0.01, stirred The rotating speed was 200 rpm, the reaction temperature was kept at 55° C., the pH value was 12.3, the co-current time was 23 h, and the mixture was aged for 20 h to obtain a solid-liquid mixed slurry.

[0145] (3) After the solid-liquid mixed slurry is subjected to pressure filtration, washing, and drying at 120° C. for 5 hours, D can b...

Embodiment 2

[0154] I: Preparation of nickel cobalt manganese hydroxide precursors

[0155] (1) Using nickel sulfate, cobalt sulfate, and manganese sulfate as raw materials, according to the molar ratio of Ni:Co:Mn=80:10:10, a uniform nickel, cobalt, and manganese salt mixed solution of 2mol / L is prepared, and 0.2mol / L is prepared. L Ce 2 (SO 4 ) 3 solution, 8mol / L KOH solution was prepared as a precipitating agent, and 25wt% ammonia water was directly used as a complexing agent.

[0156] (2) Under the protection of nitrogen, the above solution was passed into the reaction kettle in a co-current manner, controlled [n(Ni)+n(Co)+n(Mn)]: n(Ce)=1:0.015, stirred The rotating speed was 200 rpm, the reaction temperature was kept at 55° C., the pH value was 12.3, the co-current time was 20 h, and the mixture was aged for 20 h to obtain a solid-liquid mixed slurry.

[0157] (3) After the solid-liquid mixed slurry is washed, filtered by pressure, and dried at 110°C for 5.5 hours, D can be obtain...

technical field

[0001] The invention relates to the technical field of lithium ion batteries, in particular to a single crystal multi-element positive electrode material and a preparation method and application thereof. Background technique

[0002] Energy and environmental issues have always been hot spots in today's society. With the expansion of my country's new energy vehicle market, the demand for power lithium-ion batteries has risen sharply, and the rapid development of mobile phones, cameras, electric vehicles, power tools and other industries has also increased the demand for lithium-ion batteries. Therefore, the lithium-ion battery industry has good development prospects.

[0003] Lithium-ion batteries have the advantages of high energy density, zero pollution, zero emissions and small size. As the main component of lithium-ion batteries, the positive electrode material plays a decisive role in the capacity, performance and cost of the battery. The ternary materia...

Examples

preparation example Construction

[0056] In the preparation method of the single crystal multi-element cathode material of the present invention, the mixture of the precursor material and the lithium salt is subjected to two high-temperature sintering processes.

[0057] The temperature of the second high-temperature sintering is 20-200°C higher than that of the first high-temperature sintering to ensure that the positive electrode material process product I is obtained through the first high-temperature sintering.

[0058] A second aspect of the present invention provides a method for preparing a single crystal multi-element cathode material, characterized in that the method comprises the following steps:

[0059] S1, the nickel cobalt manganese hydroxide precursor, lithium source, optionally dopant D are mixed to obtain mixture I;

[0060] S2, in oxygen or air atmosphere, carry out the first high temperature sintering to described mixture I, obtain positive electrode material process product I;

[0061] S3,...

Embodiment 1

[0142] I: Preparation of nickel cobalt manganese hydroxide precursors

[0143] (1) Using nickel sulfate, cobalt sulfate, and manganese sulfate as raw materials, according to the molar ratio of Ni:Co:Mn=80:10:10, a uniform nickel, cobalt, and manganese salt mixed solution of 2mol / L is prepared, and 0.2mol / L is prepared. L's La 2 (SO 4 ) 3 solution, 8mol / L NaOH solution was prepared as a precipitating agent, and 25wt% ammonia water was directly used as a complexing agent.

[0144] (2) Under the protection of nitrogen, the above solution was passed into the reactor in a co-current manner, controlled [n(Ni)+n(Co)+n(Mn)]: n(La)=1:0.01, stirred The rotating speed was 200 rpm, the reaction temperature was kept at 55° C., the pH value was 12.3, the co-current time was 23 h, and the mixture was aged for 20 h to obtain a solid-liquid mixed slurry.

[0145] (3) After the solid-liquid mixed slurry is subjected to pressure filtration, washing, and drying at 120° C. for 5 hours, D can b...

Embodiment 2

[0154] I: Preparation of nickel cobalt manganese hydroxide precursors

[0155] (1) Using nickel sulfate, cobalt sulfate, and manganese sulfate as raw materials, according to the molar ratio of Ni:Co:Mn=80:10:10, a uniform nickel, cobalt, and manganese salt mixed solution of 2mol / L is prepared, and 0.2mol / L is prepared. L Ce 2 (SO 4 ) 3 solution, 8mol / L KOH solution was prepared as a precipitating agent, and 25wt% ammonia water was directly used as a complexing agent.

[0156] (2) Under the protection of nitrogen, the above solution was passed into the reaction kettle in a co-current manner, controlled [n(Ni)+n(Co)+n(Mn)]: n(Ce)=1:0.015, stirred The rotating speed was 200 rpm, the reaction temperature was kept at 55° C., the pH value was 12.3, the co-current time was 20 h, and the mixture was aged for 20 h to obtain a solid-liquid mixed slurry.

[0157] (3) After the solid-liquid mixed slurry is washed, filtered by pressure, and dried at 110°C for 5.5 hours, D can be obtain...

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