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High-safety aqueous and organic mixed lithium ion battery

A lithium-ion battery, high-safety technology, applied in the direction of battery electrodes, secondary batteries, battery components, etc., can solve the problems of poor cycle performance, difficulty in finding electrode pair materials, poor cycle performance, etc., and achieve long cycle life , low cost, and improved power characteristics

Inactive Publication Date: 2011-05-11
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in aqueous solution, when the lithium ion intercalation and deintercalation process reaches a certain potential, hydrogen evolution and oxygen evolution reactions will occur. It is difficult to find electrode pair materials that only undergo lithium ion intercalation and deintercalation without hydrogen evolution and oxygen evolution.
Moreover, the cycle performance of the negative electrode material mentioned in the patent is poor, that is, the cycle performance of the aqueous lithium-ion battery is very poor, and often cannot exceed dozens of cycles.

Method used

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  • High-safety aqueous and organic mixed lithium ion battery
  • High-safety aqueous and organic mixed lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The negative electrode material is made of natural graphite, and the slurry is mixed according to the ratio of graphite: conductive agent: binder = 85:5:10, and then evenly coated on the copper mesh collector fluid, dried and pressed to form an electrode. The cathode material is spinel-type LiMn for commercial lithium-ion batteries 2 o 4 . Positive electrode composition according to LiMn 2 o 4 : Carbon black: binder = 85:5:10 weight ratio mixed slurry, evenly coated on the nickel mesh current collector, dried and pressed into electrodes. In this embodiment, the actual capacity of the positive electrode material is 80 mAh / g, the negative electrode is 320 mAh / g, and the single-side coating amount of the positive electrode is 15 mg / cm 2 , the negative pole is 5 mg / cm 2. Then the two electrodes were cut according to the specifications, paired and assembled into a 2# battery (14 mm in diameter * 50 mm in height), the separator used was the separator of a commercial nic...

Embodiment 2

[0021] Adopt self-made composite separator to replace the separator of the commercial nickel-hydrogen battery in embodiment 1, its synthetic method is: Nasicon type LiTi 2 (PO 4 ) 3 The material was calcined in a tube furnace at 900°C for 1 hour until it melted, and then it was taken out and pressed into a film. After being cooled, it is ready for use, and the rest is the same as in Example 1, and the battery is prepared according to the steps and conditions in Example 1. In this embodiment, the actual capacity of the positive electrode material is 80 mAh / g, the negative electrode is 320 mAh / g, and the single-side coating amount of the positive electrode is 15 mg / cm 2 , the negative pole is 5 mg / cm 2 . In the working range of 0 V-4.3 V, the discharge current is 1C, the capacity is 1000 mAh, the average working voltage is 4.2 V, and the 10 C charge and discharge capacity is maintained at 800 mAh. After 100 cycles, the capacity retention rate can reach 70%. Compared with th...

Embodiment 3

[0023] The negative electrode material is hard carbon, and the slurry is mixed according to the ratio of graphite: conductive agent: binder = 85:5:10, and then evenly coated on the copper mesh collector, dried and pressed to form an electrode. The cathode material is spinel-type LiMn for commercial lithium-ion batteries 2 o 4 . Positive electrode composition according to LiMn 2 o 4 : Carbon black: binder = 85:5:10 weight ratio mixed slurry, evenly coated on the nickel mesh current collector, dried and pressed into electrodes. In this embodiment, the actual capacity of the positive electrode material is 80 mAh / g, the negative electrode is 160 mAh / g, and the single-side coating amount of the positive electrode is 10 mg / cm 2 , the negative pole is 5 mg / cm 2 . Then the two electrodes were cut according to the specifications, paired and assembled into a 2# battery (14 mm in diameter * 50 mm in height), the separator used was the separator of a commercial nickel-metal hydride ...

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Abstract

The invention belongs to the technical field of batteries, particularly to a high-safety aqueous and organic mixed lithium ion battery. The invention applies the ion embedded-disembedded mechanism adopted by the organic lithium ion battery to the mixed system with the separation of organic electrolyte and aqueous electrolyte, and ions of embedded reaction are lithium ions. In the high-safety aqueous and organic mixed lithium ion battery, the anode adopts the aqueous embedded compound material containing lithium ions, the cathode adopts the cathode material of the organic lithium ion battery, the electrolyte solution adopts the separated organic and aqueous electrolytes containing lithium ions, and a separating membrane adopts a lithium ion exchange membrane containing a waterproof layer. The charge-discharge process only relates to the transference of the ion between the cathode and the anode, and the features of the lithium ion battery of rocking chair type are still reserved. The high-safety aqueous and organic mixed lithium ion battery has higher work voltage than the common aqueous lithium ion battery and higher power performance than the common organic lithium ion battery. The high-safety aqueous and organic mixed lithium ion battery has the characteristics of long circulating service life, high power, safety, low cost and no environment pollution, and is particularly suitable to be used as the ideal power battery of the electric automobile.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a novel high-safety water-system organic-system hybrid lithium-ion battery. Background technique [0002] The economic development based on fossil energy can no longer meet the requirements of economic development in the new century. Scientists point out that a car-centric, disposable economic model does not work in developing countries, nor does it work in rich industrial nations, now home to 1.2 billion people. With the continuous development of this economy, it will inevitably cause the depletion of natural resources such as oil and coal, environmental pollution and the aggravation of the global warming effect. Human beings must grasp the balance between the "three Es" of the trinity of economic growth, environmental protection and energy supply. Now the world's annual energy consumption converted into oil is about 8 billion tons, of which 90% are fossil fuels....

Claims

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Application Information

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IPC IPC(8): H01M10/38H01M4/58H01M4/38H01M2/16
CPCY02E60/10Y02P70/50
Inventor 夏永姚崔王君
Owner FUDAN UNIV
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