Binary precursor and preparation method thereof, lithium ion battery positive electrode material, lithium ion battery and electric equipment

A lithium-ion battery and precursor technology, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve problems such as the defects of cobalt-free precursor cycle and rate performance, and achieve low cost, high capacity, and cycle performance. and good magnification performance

Pending Publication Date: 2022-03-18
CNGR ADVANCED MATERIAL CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] The existing cobalt-free precursors have defects in cycle and rate performance, so it is necessary to develop a precursor that can make up for the defects in cycle and rate performance caused by the lack of cobalt

Method used

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  • Binary precursor and preparation method thereof, lithium ion battery positive electrode material, lithium ion battery and electric equipment
  • Binary precursor and preparation method thereof, lithium ion battery positive electrode material, lithium ion battery and electric equipment
  • Binary precursor and preparation method thereof, lithium ion battery positive electrode material, lithium ion battery and electric equipment

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preparation example Construction

[0080] The present application also provides a method for preparing the binary precursor, including:

[0081] Mix the materials including complexing agent, hydroxide and water to obtain the bottom liquid, then continuously add complexing agent, hydroxide and nickel-manganese binary mixed salt solution to the bottom liquid at the same time, coprecipitate under stirring conditions The reaction obtains the binary precursor.

[0082] In an optional embodiment, the mixed salt solution includes soluble nickel salt and manganese salt;

[0083] In an optional embodiment, the soluble nickel salt includes one or more of nickel sulfate, nickel nitrate, nickel acetate;

[0084] In an optional embodiment, the manganese salt includes one or more of manganese sulfate, manganese nitrate, and manganese acetate;

[0085] In an optional embodiment, the concentration of the nickel-manganese binary mixed salt solution is 0.5-2mol / L;

[0086] Optionally, the concentration of the nickel-manganese...

Embodiment 1

[0114] The nickel and manganese sulfate crystals (molar ratio 0.75:0.25) are configured into a 2mol / L uniform binary metal salt mixed solution; 10mol / L sodium hydroxide solution and 8mol / L ammonia water are mixed to prepare a pH of 11.7 Add the bottom liquid into the reaction kettle with stirring device, under the stirring speed of 600r / min, then slowly add ammonia water, sodium hydroxide solution, binary metal salt mixed solution in a certain proportion, wherein the reaction kettle removes The temperature of the ionized water is 55℃, the addition rate of the binary metal salt mixed solution is 3-4-5L / h, the addition rate of the sodium hydroxide solution is 1.2-1.6-2.0L / h, and the addition rate of the ammonia water is 0.15L / h h, the high-nickel and cobalt-free binary precursor was obtained by consuming 319 L of the binary metal salt mixed solution.

[0115] The above-mentioned precipitate is centrifugally washed and dried in an oven to obtain a dry material; after the obtained...

Embodiment 2

[0120] The nickel and manganese sulfate crystals (molar ratio 0.75:0.25) are configured into a 2mol / L uniform binary metal salt mixed solution; 10mol / L sodium hydroxide solution and 6mol / L ammonia water are mixed to prepare a pH of 11.7 Add the bottom liquid into the reaction kettle with stirring device, under the stirring speed of 600r / min, then slowly add ammonia water, sodium hydroxide solution, binary metal salt mixed solution in a certain proportion, wherein the reaction kettle removes The temperature of the ionized water is 55°C, the stirring rate is 600-500r / min, the addition rate of the binary metal salt mixed solution is 3-4-5L / h, and the addition rate of the sodium hydroxide solution is 1.2-1.6-2.0L / h , the addition rate of ammonia water is 0.15L / h, and the high-nickel and cobalt-free binary precursor is obtained under the condition of consuming 423L of binary metal salt mixed solution.

[0121] The above-mentioned precipitate is centrifugally washed and dried in an ...

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Abstract

The invention provides a binary precursor and a preparation method thereof, a lithium ion battery positive electrode material, a lithium ion battery and electric equipment. The binary precursor comprises an inner layer area and an outer layer area arranged on the surface of the inner layer area; the inner layer area comprises primary particles arranged in a honeycomb shape, and the outer layer area comprises primary particles arranged in a radial shape. The preparation method comprises the following steps: mixing materials including a complexing agent, hydroxide and water to obtain a base solution, then simultaneously and continuously adding the complexing agent, the hydroxide and a nickel-manganese binary mixed salt solution into the base solution, and carrying out a co-precipitation reaction under a stirring condition to obtain a binary precursor; raw materials of the lithium ion battery positive electrode material comprise a binary precursor. The raw material of the lithium ion battery comprises the lithium ion battery positive electrode material. And the electric equipment comprises a lithium ion battery. The positive electrode material prepared from the precursor provided by the invention is large in capacity, high in cycle retention rate and high in charging and discharging speed.

Description

technical field [0001] The present application relates to the field of new materials, in particular to a binary precursor and a preparation method thereof, a positive electrode material for a lithium ion battery, a lithium ion battery and an electrical device. Background technique [0002] Lithium batteries are a key strategic industry at this stage and are widely used in new energy vehicles, electric vehicles, mobile phones and other industries. The precursor cathode material has the advantages of low cost, large electric capacity, excellent cycle performance, and good overall performance. [0003] Due to the small reserves of metallic cobalt in the world, it can only be consumed by humans for 40 years without considering recycling, and the price is relatively expensive. For the sake of cost reduction and large-scale use in the future, research on cobalt-free binary precursors is imperative. [0004] Existing cobalt-free precursors have defects in cycle and rate performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/00H01M4/505H01M4/525H01M10/0525C01P2006/12C01P2004/61C01P2004/03C01P2002/72C01P2004/51Y02E60/10
Inventor 迟珺文沙金訚硕欧宁张磊王乐张雨英伍兴科王一乔艾延龄
Owner CNGR ADVANCED MATERIAL CO LTD
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