Double layer clad lithium ion battery cathode material and preparation method thereof

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as high interfacial internal resistance, increased interfacial internal resistance, instability, etc.

Active Publication Date: 2018-10-16
TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] For the nickel-rich ternary cathode material, as the nickel content increases, its cycle performance becomes worse, because the material easily absorbs moisture and carbon dioxide in the air, and then generates impurities such as lithium hydroxide and lithium carbonate, which are deposited on the surface of the cathode. , which increases the interfacial internal resistance; in addition, since the positive electrode is in the delithiated state, the Ni 4+ It is very unstable and high

Method used

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  • Double layer clad lithium ion battery cathode material and preparation method thereof
  • Double layer clad lithium ion battery cathode material and preparation method thereof
  • Double layer clad lithium ion battery cathode material and preparation method thereof

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Experimental program
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Embodiment approach

[0042] According to a preferred embodiment of the present invention, the nickel-cobalt-manganese ternary material is composed of the formula LiNi x co (1-x) / 2 mn (1-x) / 2 o 2 Indicates that 0.6≤x<1.

[0043] In a further preferred embodiment, the nickel-cobalt-manganese ternary material is LiNi 0.6 co 0.2 mn 0.2 o 2 or LiNi 0.8 co 0.1 mn 0.1 o 2 .

[0044] Wherein, the base body is a nickel-rich ternary material.

[0045] According to a preferred embodiment of the present invention, the silicon lithium salt is selected from one of lithium metasilicate, lithium orthosilicate and lithium disilicate, or any combination thereof.

[0046] Wherein, in the present invention, the silicon-lithium salt is a silicon-lithium salt generated by a neutralization reaction between a weak silicon acid and a residual alkali such as lithium hydroxide or lithium carbonate on the surface of the substrate. Therefore, the silicon-lithium salt coating layer and The surface of the substra...

Embodiment 1

[0116] Take 1g of metasilicate in 100g of ethanol, carry out ultrasonic dispersion, and then slowly add 100g of LiNi into it 0.6 co 0.2 mn 0.2 o 2 , Stir for 30 minutes to fully react the metasilicate and the residual alkali on the surface of the material.

[0117] Heat to 60°C until ethanol is completely evaporated, sinter at 300°C for 5 hours, and pass through a 300-mesh sieve to obtain the primary product coated with silicon-lithium salt.

[0118] Mix the obtained primary product coated with silicon-lithium salt with 0.1 g of nano-alumina, perform high-speed ball milling and mixing for 3 hours, so that nano-alumina is evenly coated on the primary product, and then sinter at 600 ° C for 8 hours, and then naturally cool down to obtain Double-layer coated lithium-ion battery cathode material.

Embodiment 2

[0120] Take 0.1g of orthosilicic acid in 150g of ethanol, carry out ultrasonic dispersion, and then slowly add 100g of LiNi into it 0.6 co 0.2 mn 0.2 o 2 , Stir for 10 minutes to fully react the orthosilicic acid with the residual alkali on the surface of the material.

[0121] Heating to 50°C until ethanol evaporates completely, sintering at 250°C for 14 hours, and passing through a 300-mesh sieve to obtain the primary product coated with silicon-lithium salt.

[0122] Mix the obtained primary product coated with silicon-lithium salt with 0.05g of nano-calcium oxide, perform high-speed ball milling and mixing for 4 hours, so that nano-calcium oxide is evenly coated on the primary product, and then sinter at 650°C for 10 hours, and then naturally cool down to obtain Double-layer coated lithium-ion battery cathode material.

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Abstract

The invention discloses a double layer clad lithium ion battery cathode material and a preparation method thereof. The cathode material takes a lithium nickel cobalt manganese oxide ternary material as a matrix, and the surface of the matrix is clad with silicon lithium salt cladding and metal oxide cladding. The silicon lithium salt cladding is formed through the following steps: mixing silicon weak acid with the matrix, and carrying out a neutralization reaction on the silicon weak acid and residual alkali on the surface of the matrix to generate a layer of silicon lithium salt with which the matrix is clad. The metal oxide is mixed with the matrix which is clad with the silicon lithium salt, and the matrix is clad with a layer of the metal oxide cladding through physical cladding. The double layer clad lithium ion battery cathode material reduces the amount of the residual alkali on the surface of the lithium nickel cobalt manganese oxide matrix material, and prevents a side reaction of an electrolyte and the matrix material. Furthermore, the cathode material has high rate performance, high specific capacity and good cycle performance. In addition, the method is simple and is easy in operation and large scale production.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular relates to a nickel-rich ternary positive electrode material, in particular to a double-layer coated lithium ion battery positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion battery ternary cathode materials have the advantages of high working voltage, high energy density, long cycle life, low self-discharge rate, and no memory effect. They are widely used in electronic equipment and electric vehicle power batteries and other fields. [0003] For the nickel-rich ternary cathode material, as the nickel content increases, its cycle performance becomes worse, because the material easily absorbs moisture and carbon dioxide in the air, and then generates impurities such as lithium hydroxide and lithium carbonate, which are deposited on the surface of the cathode. , which increases the interfacial internal resistance; in addition, sin...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M4/624H01M10/0525Y02E60/10
Inventor 苏迎春国天骄周宏宝朱晓沛林纯灵周玉林吴剑文高智张溪
Owner TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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