Semi-solid lithium cathode suspension based on nickel-cobalt lithium manganese oxide carbon nanotube composite

A technology of nickel-cobalt lithium manganese oxide and carbon nanotubes, which is applied in the direction of positive electrodes, fuel cells, battery electrodes, etc., and can solve the problems of reducing the energy efficiency of the battery system and increasing the viscosity

Active Publication Date: 2021-07-06
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the electrolyte of traditional flow batteries, the viscosity (~1000cP) of semi-solid lithium flow battery electrolytes has also increased significantly, which will bring a lot of pump work and greatly reduce the system energy efficiency of the battery.

Method used

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  • Semi-solid lithium cathode suspension based on nickel-cobalt lithium manganese oxide carbon nanotube composite
  • Semi-solid lithium cathode suspension based on nickel-cobalt lithium manganese oxide carbon nanotube composite
  • Semi-solid lithium cathode suspension based on nickel-cobalt lithium manganese oxide carbon nanotube composite

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Experimental program
Comparison scheme
Effect test

Embodiment

[0041] In this example, two materials, LNCM and LNCM / CNTs, were prepared respectively to compare the differences in their specific technical effects.

[0042] Firstly, the nickel-cobalt lithium manganese oxide / carbon nanotube composite material LNCM / CNTs is prepared, and the basic steps of its preparation are as follows:

[0043] Raw materials include analytically pure CH without any purification treatment 3 COOLi·2H 2 O(≥99.0%), Ni(CH 3 COO) 2 4H 2 O (≥98.0%), Co (CH 3 COO) 2 4H 2 O(≥99.5%) and Mn(CH 3 COO) 2 4H 2 O (≥99.0%).

[0044] 1) The raw materials were dissolved in distilled water to form a brown metal slurry with a Li:Ni:Co:Mn stoichiometric ratio of 3.3:1:1:1, and the excess lithium was used to compensate for the loss during the preparation process.

[0045] 2) Add carbon nanotubes to the brown metal slurry and mix evenly. The amount of carbon nanotubes added should ensure that the mass ratio of carbon nanotubes in the finally prepared LNCM / CNTs is 25%, t...

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Abstract

The invention discloses a semi-solid lithium cathode suspension based on nickel-cobalt lithium manganese oxide / carbon nanotube composite material, which is used to improve the contradiction between the conductivity and fluidity of the suspension in a semi-solid lithium ion flow battery, and Improving the electrochemical performance of semi-solid lithium-ion flow batteries. As a high-performance conductive agent, carbon nanotubes are easier to form a conductive network than traditional carbon black conductive agents, but when directly added to the suspension, the viscosity of the suspension will increase significantly, increasing the pump work and reducing the efficiency of the battery system. Combining carbon nanotubes with lithium ion active materials can enhance the conductivity of the suspension while reducing the increase in viscosity, and can bring about many improvements in electrochemical performance.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a semi-solid lithium cathode suspension based on nickel-cobalt lithium manganese oxide / carbon nanotube composite material. Background technique [0002] In order to solve the problems of fossil energy shortage and serious environmental pollution, renewable energy sources such as solar energy and wind energy have been gradually developed. However, new energy power generation has obvious discontinuous, unstable and uncontrollable unsteady characteristics. It will impact the power grid and affect the safety and reliability of the power grid. The supporting high-efficiency energy storage system can change the traditional power system's mode of synchronous production, transmission, and use of electric energy, and improve the efficiency and operational stability of the power grid by cutting peaks and filling valleys. Therefore, accelerating the development of energy storage techno...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M8/18
CPCH01M4/362H01M4/505H01M4/525H01M4/625H01M8/188H01M2004/028Y02E60/10Y02E60/50
Inventor 陈涛郑梦莲孙洁刘柏辰刘珂罗岩松俞自涛范利武张良
Owner ZHEJIANG UNIV
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