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Battery

A technology of batteries and electrolytes, applied in the field of electrochemical energy storage, can solve the problems of insignificant improvement effect of conductive agents, achieve good stability and anti-oxidation performance, increase conductivity, specific capacity and cycle stability.

Inactive Publication Date: 2016-03-30
POSITEC POWER TOOLS (SUZHOU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditionally, the preparation of electrode materials is to mix active materials, conductive agents and polymer binders, however, the improvement effect of general conductive agents (such as acetylene black) is not obvious

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0103] Cathode active material LiMn 2 o 4 Using MTI company. Multi-walled carbon nanotubes (CNTs) are prepared by chemical vapor deposition (CVD), with a length of up to 100 μm and a diameter of about 11 nm. But in order to prepare pure CNT: use 18% HCl solution and 20% HF solution to remove impurity catalyst attached to CNT, wash with deionized water, and then dry.

[0104] The active material LiMn 2 o 4 , a composite conductive agent containing carbon nanotubes and acetylene black (referred to as CNT / AB, wherein the mass ratio of CNT to AB is 0.5), polyvinylidene fluoride PVDF, mixed in NMP at a mass ratio of 83:10:7 to form Uniform cathode slurry, where the cathode material is denoted as CNT / AB / LiMn 2 o 4 , CNT / AB and LiMn 2 o 4 The mass ratio is 0.12. The positive electrode slurry was coated on the current collector graphite foil, and air-dried at 60 °C for 24 h. The positive electrode obtained above is cut into a circular positive electrode sheet with a diameter...

Embodiment 2

[0108] The difference from Example 1 is that the composite conductive agent CNT / AB and LiMn 2 o 4 The mass ratio is 0.2, and other parts are the same as in Example 1, and assembled into a battery.

Embodiment 3

[0110] The difference from Example 1 is that the mass ratio of CNT to AB in the composite conductive agent of the positive electrode material is 0.33, and the other parts are the same as in Example 1, and a battery is assembled.

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Abstract

The invention provides a battery, which includes an anode, a cathode, and an electrolyte solution. The anode includes a positive active material able to realize reversible separation-embedding of first metal ions. The electrolyte solution consists of first metal ions and second metal ions, in the process of charging and discharging, the first metal ions can achieve reversible separation-embedding at the anode, the second metal ions can be reduced and deposited into second metal and the second metal can be reversibly oxidized and dissolved into second metal ions. Specifically, the anode also includes a composite conductive agent containing carbon nanotubes and acetylene black, the composite conductive agent and the positive active material are in a mass ratio of 0.005-0.3, and the carbon nanotubes and acetylene black are in a mass ratio of 0.25-1.25. The invention can improve the self-discharge problem of batteries, and the provided battery has long cycle life, excellent rate capability and high specific capacity.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, and in particular relates to a battery. Background technique [0002] In recent years, due to economic development and population increase, energy storage and environmental pollution have become more and more serious. Therefore, clean, renewable energy, such as solar and wind power, has become a hot spot. However, the supply and demand of these renewable energy sources fluctuate with time and seasons. Therefore, the stability of their power supply should be regulated by an energy storage system that can have a fast response to frequent changes in supply demand. So far, the existing energy sources, such as lead-acid batteries or lithium-ion batteries, all face different challenges or problems. Therefore, there is an urgent need for high-rate performance, safe and reliable energy storage systems to utilize these renewable energies, including their connection to the grid and their ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36H01M4/62
CPCY02E60/10
Inventor 朱晓陈璞
Owner POSITEC POWER TOOLS (SUZHOU) CO LTD
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