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Composite material, preparation method of composite material, and lithium ion battery comprising composite material

A composite material, lithium source technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of organic consumption, increased cost, and insufficient connection, achieving obvious cost-effective advantages, improved pressure resistance, and good consistency Effects of Sex and Uniformity

Active Publication Date: 2014-10-01
NEC (CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method requires secondary roasting, which consumes a large amount of organic matter and increases the cost. At the same time, it has the disadvantage that the two substances are not tightly connected.

Method used

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  • Composite material, preparation method of composite material, and lithium ion battery comprising composite material
  • Composite material, preparation method of composite material, and lithium ion battery comprising composite material
  • Composite material, preparation method of composite material, and lithium ion battery comprising composite material

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Embodiment 1

[0044] An embodiment of the present invention provides a composite material, the composite material is a multi-layer core-shell structure, the shell layer of the composite material includes a middle layer and an outer layer coated outside the middle layer, and the inner core of the composite material is Li(Ni x co y Al z )O 2 , the middle layer is Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 , the outer layer is LiNi 0.5 mn 1.5 o 4 , the mol ratio of the inner core, the middle layer and the outer layer of the composite material is a:b:c, wherein a+b+c=1, 0

[0045] The composite material provided by the embodiment of the present invention has a multi-layer core-shell structure. NCA material is selected for the inner core, NCM material is selected for the middle shell layer, and spinel lithium nickelate material is selected for the outer shell layer. Since the shell material itself has a certain capacity, the coating on the high-capacit...

Embodiment 2

[0048] The embodiment of the present invention provides a preparation method of a composite material, the preparation method comprising:

[0049] Step 1: Obtain a composite material precursor with a core-shell structure through co-precipitation in sequence. The shell layer of the composite material precursor includes an intermediate layer and an outer layer coated outside the intermediate layer. The core of the composite material precursor is (Ni x co y Al z )(OH) 2 , the middle layer is (Ni 1 / 3 co 1 / 3 mn 1 / 3 )(OH) 2 , the outer layer is Ni 0.25 mn 0.75 (OH) 2 ;

[0050] Step 2: Mix the precursor of the composite material with the lithium source according to the molar ratio of 1:1-1.1 and then roast, then cool, crush, and sieve to obtain the inner core as Li(Ni x co y Al z )O 2 , the middle layer is Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 , the outer layer is LiNi 0.5 mn 1.5 o 4 The composite material, the molar ratio of the inner core, the middle layer and the outer...

Embodiment 3

[0069]Prepare 9L of Ni, Co, and Al nitrate solution A with a concentration of 1mol / L, wherein the molar ratio of Ni, Co, and Al is 0.8:0.15:0.05; prepare 0.05L of Ni, Co, and Mn nitric acid with a concentration of 1mol / L Salt solution B, wherein the molar ratio of Ni, Co, and Mn is 1:1:1; preparing 1 L of Ni, Mn nitrate solution C with a concentration of 1mol / L, wherein the molar ratio of Ni, Mn is 0.25:0.75; Prepare a sufficient amount of 6mol / L NaOH alkali solution.

[0070] Inject solution A at a speed of 1L / h into a reaction kettle with a rotation speed of 200rps, and at the same time inject 6mol / L NaOH alkali solution to keep the pH value in the reaction kettle between 10-11. After the solution A is added dropwise, Immediately add solution B dropwise to the reactor at a rate of 0.5L / h. After 0.1h, solution B is completely injected into the reactor, and then immediately add solution C dropwise to the reactor at a rate of 0.5L / h. Solution C drops After the addition is comp...

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Abstract

The invention discloses a composite material, a preparation method of the composite material, and a lithium ion battery comprising the composite material, and belongs to the field of lithium ion battery materials. The composite material is in a core-shell structure. A shell layer of the composite material comprises a middle layer and an outer layer coated outside the middle layer. An inner core of the composite material is Li(NixCoyAlz)O2; the middle layer is Li(Ni1 / 3Co1 / 3Mn1 / 3)O2; the outer layer is LiNi0.5Mn1.5O4; and a molar ratio of the inner core to the middle layer to the outer layer of the composite material is a:b:c, wherein a+b+c=1, b is greater than 0 and less than 0.5, c is greater than 0 and less than 0.5, x+y+z=1, y=0.15, and z is greater than or equal to 0.03 and is less than or equal to 0.05. The composite material has the characteristics of comparatively high capacity, low alkalinity and electrolyte resistance, has good cycling stability and safety performance, has an obvious cost performance advantage, and is more suitable for application of a power battery. Structural precursors of the layers of the composite material are sequentially formed by utilizing a coprecipitation synthesis technology, so that good consistency and good homogeneity are achieved and the layers are tightly connected with each other. Besides, the composite material can be obtained by a single roasting process; and the cost can be lowered effectively.

Description

technical field [0001] The invention relates to the field of lithium-ion battery materials, in particular to a composite material used for lithium-ion battery cathodes and a preparation method for a precursor thereof and a battery using the composite material. Background technique [0002] Lithium-ion battery is a high-energy battery that has developed rapidly in the past ten years. Due to its advantages of large capacity, high voltage, and small self-discharge, it has become the preferred power source for electric vehicles and other fields. Therefore, the cycle performance and cost of lithium-ion batteries will become important factors affecting the commercialization process of electric vehicles and other fields. [0003] Cathode material is an important part of lithium-ion batteries, and it is also a key part that determines the cycle performance and cost of lithium-ion batteries. At present, lithium cobalt oxide is the most widely commercialized lithium-ion battery catho...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCY02E60/122H01M4/364H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李鹏黄庆华郭健
Owner NEC (CHINA) CO LTD
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