Novel lithium ion battery positive electrode material and lithium ion secondary battery using positive electrode material

A technology for secondary batteries and cathode materials, applied in the field of new energy materials, can solve the problems of limiting high current charge and discharge performance, low ion diffusivity, low electronic conductivity, etc., and achieves good application prospects, rich raw material sources, and crystal lattice. Defective effect

Inactive Publication Date: 2014-06-18
HUNAN ZHENGYUAN ENERGY STORAGE MATERIALS & DEVICE INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium cobalt oxide has good overall performance, but its safety performance is poor
Lithium nickelate has high energy density, but the price is high and there are also safety hazards, and cobalt and nickel are toxic and pollute the environment
Lithium manganese oxide is cheap and has good safety performance, but poor high-temperature cycle performance
Lithium iron phosphate has been widely used in the power battery industry in recent years. It has the characteristics of wide source of raw materials, high safety, and large specific capacity. However, its low ion diffusivity and low electronic conductivity limit its high-current charge-discharge performance.

Method used

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  • Novel lithium ion battery positive electrode material and lithium ion secondary battery using positive electrode material
  • Novel lithium ion battery positive electrode material and lithium ion secondary battery using positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1 NbO, conductive carbon black, and PVDF were mixed in a mass ratio of 80:10:10, coated on the current collector and vacuum-dried at 120°C for 12 hours to make the positive electrode of the lithium battery. A button battery is assembled with a lithium metal sheet as the negative electrode, 1M LiPF6 as the electrolyte, and CELL GARD 2003 as the diaphragm. The electrochemical performance test of the lithium-ion secondary battery made of the NbO positive electrode material was carried out, and the charging and discharging voltage was 1.0V~3.0V. The electrochemical performance of this example product is shown in Table 1.

Embodiment 2

[0014] Example 2 Mix NbO, acetylene black, and polyvinyl alcohol in a mass ratio of 90:5:5, apply it on the current collector and dry it in vacuum at 120°C for 12 hours to make the positive electrode of the lithium battery. Graphite is used as the negative electrode, 1M LiPF6 is used as the electrolyte, and CELL GARD 2003 is used as the separator to assemble a button battery. The electrochemical performance test of the lithium-ion secondary battery made of the NbO positive electrode material was carried out, and the charging and discharging voltage was 1.0V~3.0V. The electrochemical performance of this example product is shown in Table 1.

Embodiment 3

[0015] Example 3 Mix NbO, activated carbon fiber, and polyethylene in a mass ratio of 85:10:5, apply it on the current collector and dry it in vacuum at 120°C for 12 hours to make the positive electrode of lithium battery. A button battery is assembled with carbon-silicon composite material as the negative electrode, 1M LiPF6 as the electrolyte, and CELL GARD 2003 as the diaphragm. The electrochemical performance test of the lithium-ion secondary battery made of the NbO positive electrode material was carried out, and the charging and discharging voltage was 1.0V~3.0V. The electrochemical performance of this example product is shown in Table 1.

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Abstract

The invention relates to a novel lithium ion secondary battery positive electrode material--NbOx (wherein x is equal to 1 to 2). A lithium ion secondary battery with the positive electrode material containing the active substance NbOx and a negative electrode prepared from a lithium sheet is characterized in that charge and discharge voltage platforms of the lithium ion secondary battery are 1.8 v and 1.6 V, respectively, and the lithium ion secondary battery has good charge-discharge cycle performance, environment friendliness, no pollution, etc. NbOx (wherein x is equal to 1 to 2) is a novel lithium ion battery positive electrode material with application prospects, high capacity and high safety.

Description

technical field [0001] The invention relates to a novel lithium ion battery cathode material and a lithium ion secondary battery using the cathode material, belonging to the field of new energy materials. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic devices such as notebook computers, digital cameras, and mobile phones since the 1990s. At the same time, it is also widely used in energy storage devices. With the gradual commercialization of lithium-ion batteries, cathode materials, as the key materials of lithium-ion batteries, restrict the performance and price of lithium-ion batteries. [0003] At present, lithium-ion battery cathode materials widely used include lithium cobaltate, lithium manganate, lithium nickelate, and lithium iron phosphate. Lithium cobalt oxide has good overall performance, but its safety performance is poor. Lithium nickelate has a high energy density, but it is expensive and also has potential s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M10/0525
CPCY02E60/122H01M4/48H01M10/0525H01M2004/028Y02E60/10
Inventor 李荐刘雯雯周宏明
Owner HUNAN ZHENGYUAN ENERGY STORAGE MATERIALS & DEVICE INST
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