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Preparation of stratified lithium ion anode material

A positive electrode material, lithium ion technology, applied in the field of lithium ion secondary battery positive electrode materials, can solve the problems of poor product reproducibility and consistency, uneven mixing of precursors and lithium sources, high solid-state reaction temperature, etc., to achieve the manufacturing method Ease of control, improved working voltage platform and safety, low production cost

Active Publication Date: 2011-01-12
HENAN KELONG NEW ENERGY CO LTD
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Problems solved by technology

[0004] At present, the synthesis of lithium transition metal oxides composed of nickel (Ni), cobalt (Co), manganese (Mn) and other transition elements has become the development trend of current lithium battery cathode materials, but from the synthesis of Li X Ni 1-Y m Y o 2 From the perspective of large-capacity cathode materials, there is a common disadvantage, that is, the traditional high-temperature solid-state reaction is easy to generate non-stoichiometric products, the product reproducibility and consistency are poor, the precursor and the lithium source are mixed unevenly, and The solid state reaction temperature is high, the cost is high, and the capacity is low

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  • Preparation of stratified lithium ion anode material
  • Preparation of stratified lithium ion anode material
  • Preparation of stratified lithium ion anode material

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Embodiment 1

[0025] The synthetic chemical formula is LiNi 0.7 mn 0.2 Al 0.05 co 0.05 o 2 Taking the positive electrode material as an example, nickel, manganese, and Al-doped sulfate were prepared according to the stoichiometric ratio to prepare a 5 mol / L mixed salt solution, 3 mol / L ammonia solution and 1 mol / L NaOH solution. Use an electronic metering pump to inject the mixed salt solution, ammonia solution and NaOH solution into the reactor according to the flow rate of 15mL / min, 6mL / min and 8mL / min respectively, keep the reaction temperature at 75°C, and the pH value at 10.5, at 80r / min After reacting in the reactor for 5 hours at a rotating speed, uniform spherical Ni can be obtained after washing, filtering (600 mesh) and drying. 0.7 mn 0.2 Al 0.05 (OH) 2 Precursor. Its SEM picture is attached figure 1 . Then carry out surface coating treatment to it according to the following scheme: by mass ratio m (Ni0.7Mn0.2Al0.05(OH)2) :m PTFE =25:1 Weigh polytetrafluoroethylene (PT...

Embodiment 2

[0030] Synthetic formula LiNi 0.6 mn 0.2 Ti 0.02 Mg 0.02 Zn 0.02 co 0.14 o 2 As an example, nickel, manganese and sulfates doped with metals Ti, Mg and Zn are prepared respectively according to the stoichiometric ratio to prepare 5 mol / L solution, 2 mol / L ammonia solution and 2 mol / L NaOH solution. The mixed salt solution, ammonia solution and NaOH solution were injected into the reactor at a certain flow rate of 12mL / min, 7mL / min and 7mL / min respectively with an electronic precision pump, and the reaction temperature was kept at 80°C and the pH value was 11. After reacting in the reactor at 80r / min for 5 hours, the uniform spherical Ni can be obtained after washing, filtering (600 mesh) and drying. 0.6 mn 0.2 Ti 0.02 Mg 0.02 Zn 0.02 (OH) 2 Precursor. Then carry out surface coating treatment to it according to the following scheme: by mass ratio m (Ni0.6Mn0.2Ti0.02Mg0.02Zn0.02(OH)2) :m PTFE =20:1 Weigh styrene-butadiene rubber (SBR), add water to form a 45% suspe...

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Abstract

The invention relates to a preparation method of a stratified lithium ion anode material, which comprises the following steps: coating cobalt on the surface of a precursor containing nickel, manganese and a small amount of other metals by a chemical precipitation method; fully mixing with a lithium source; and then, adopting a solid reaction method to prepare the high nickel type lithium ion anode material. The chemical formula of the lithium ion anode material is as follows: LidNiaMnbMcCo1-a-b-c02, wherein 0.9<=d<=1.25, 0.5<=a<=1, 0<b<0.5, 0.9<=a+b+c<1, and M is one or a mixture of more than one of Al, Ti, Mg and Zn. The material has uniform chemical composition and high capacity. Besides, the cycle performance of the material is improved, and the operating voltage platform and the safety of a battery are enhanced, especially after the material is subject to doping and coating modification.

Description

technical field [0001] The invention relates to a secondary battery cathode material, in particular to a lithium ion secondary battery cathode material with high energy density and excellent cycle performance. Background technique [0002] Energy crisis and environmental pollution are severe challenges faced by human beings, and finding clean and renewable secondary energy is an urgent task to realize the sustainable development of human society. Among the many secondary battery systems, lithium-ion batteries have the advantages of high working voltage, high energy density, long cycle life, low self-discharge rate, and environmental protection, and have become the main trend of secondary battery development. Lithium cobalt oxide (LiCoO 2 ), lithium nickelate (LiNiO 2 ), lithium manganese oxide with spinel structure (LiMn 2 o 4 ). [0003] LiCoO 2 It is currently a commonly used commercial lithium-ion battery cathode material, with a very mature preparation process and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58C01G53/00H01M4/04
CPCY02E60/12Y02E60/10
Inventor 张天记徐拥军王明强程迪魏玲
Owner HENAN KELONG NEW ENERGY CO LTD
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