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Non-water body electrochemical mixed capacitor with lithium ion battery material as positive pole

A hybrid capacitor, electrochemical technology, applied in the field of capacitors, can solve problems such as poor structural stability, large expansion and contraction, high operating voltage, etc., and achieve the effects of high specific energy, high power cycle life, and long cycle life

Inactive Publication Date: 2006-05-17
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing lithium battery negative electrode materials such as hard carbon, graphite and metal alloy materials have low insertion potential, lithium dendrites are prone to be generated during high current charging and discharging, and the structural stability is also poor, and they expand and shrink during lithium insertion and delithiation. Large; while transition metal nitrides, sulfides, phosphides, etc. have relatively stable structures, but their potentials are high, which is not conducive to obtaining high operating voltages.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Preparation of LiNi by sol-gel method 0.5 mn 1.5 o 4 As the positive electrode material, LiNO with a molar ratio of 1:0.5:1.5 3 , Ni(NO 3 ) 2 .6H 2 O, Mn(NO 3 ) 2 (Aqueous solution with a mass ratio of 50%) is dissolved in 20% PVA (polyvinyl alcohol), fully stirred for several hours, heated to 150°C to remove excess water, and initiates a reaction to decompose it. The reaction product was calcined in a muffle furnace at 450°C for 5h and then at 750°C for 12h to obtain the target product. With isopropanol as dispersant, the prepared LiNi 0.5 mn 1.5 o 4 After fully mixing with conductive agent acetylene black and binder PTFE (polytetrafluoroethylene) according to the mass ratio of 85:10:10, press it on the Al mesh, cut it to a suitable size, and bake it in vacuum at 80°C for 12 hours , assembled in the order of positive electrode / separator / negative electrode in the glove box. Single electrode test with lithium sheet as negative electrode, 1M LiPF 6 - EC / DMC (...

Embodiment 2

[0019] Take LiNi 0.5 mn 1.5 o 4 As the positive electrode, commercial activated carbon (specific surface: 1600cm 2 / g) (hereinafter referred to as activated carbon) as the negative electrode assembly asymmetric hybrid capacitor. The composition ratio of positive electrode slurry is the same as embodiment 1, and the slurry composition ratio of negative active carbon electrode is activated carbon: conductive agent: binding agent=85: 10: 5, and here conductive agent adopts graphite or carbon black, and binding agent adopts Cellulose or polytetrafluoroethylene, the positive and negative poles use Al mesh and Cu mesh as current collectors respectively, and the mass ratio of the active materials of the negative and positive poles is 2:1. At this time, the utilization rate of the positive pole is close to 60%. The assembly process of the capacitor as well as the used diaphragm and electrolyte are the same as those in Example 1. The average working voltage of the hybrid capacitor ...

Embodiment 3

[0021] Take LiNi 0.5 mn 1.5 o 4 Be the positive pole, activated carbon is the negative pole, assemble the asymmetric hybrid capacitor according to the same method in embodiment 2, the mass ratio of negative and positive pole active material is 1: 1, and the utilization rate of positive pole is about 30% now. Due to the low utilization rate of the positive electrode, the energy density of the hybrid capacitor is lower than that of Example 2, but due to the smaller depth of discharge, the cycle life of the capacitor is further improved, which is better than that of Example 2, see Table 1 for details.

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PUM

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Abstract

A nonaqueous system electrochemical mixed capacitor using lithium cell material as positive electrode is prepared as combining ion embedding ¿C deembedding mechanism of lithium cell with double electric layer mechanism in a power accumulator, using LiMn2 ¿C x MxO4 material as positive electrode and using active carbon with high specific surface area as negative electrode to form asymmetric electrochemical capacitor.

Description

technical field [0001] The invention belongs to the technical field of capacitors, and in particular relates to a non-aqueous system hybrid capacitor with a high-potential lithium-ion battery material as the positive electrode and activated carbon with a high specific surface area as the negative electrode. Background technique [0002] With the continuous development of the economy, it will inevitably lead to the depletion of oil resources, environmental pollution, and the aggravation of global warming. The comprehensive and high-efficiency development and utilization of new energy, energy-saving technology, and environmental technology has become a very necessary subject, and the development of electric vehicles is imperative. Because electrochemical capacitors (also known as supercapacitors) have the advantages of fast charging and discharging, no pollution to the environment, and long cycle life, they are expected to become a new type of green energy in this century, esp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/00H01G9/02H01G9/042H01M4/62H01M14/00H01M16/00
CPCY02E60/10Y02E60/13
Inventor 夏永姚李会巧熊焕明
Owner FUDAN UNIV
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