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Chromium oxide/CNTS composite material and preparation and application thereof

A chromium oxide and composite material technology, which is applied to active material electrodes, electrodes of primary batteries, batteries of organic electrolytes, etc. Excellent, rate performance improvement, conductivity improvement effect

Active Publication Date: 2021-06-15
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent Publication No. CN112201773A discloses a preparation method and application of a copper-coated chromium oxide positive electrode. In order to improve the discharge (electricity) specific capacity, kinetic process and rate performance of the chromium oxide positive electrode material, chromium trioxide Through high-temperature calcination, ball milling, and water washing, the chromium oxide positive electrode is prepared, and the surface of the chromium oxide positive electrode is coated with copper. This patent mainly uses copper as the electrode reaction material and chromium oxide (Cr 2 o 5 ) to participate in the reaction together, the purpose is to improve the specific capacity and voltage platform of the second charge and discharge of chromium oxide as the positive electrode material of lithium-ion batteries, but the specific capacity of the first discharge is not improved, because the specific capacity of the first discharge before coating copper 327.5mAh / g, after coating copper, the initial discharge specific capacity is 315.6mAh / g, after coating copper, the initial discharge specific capacity decreases instead
[0005] Therefore, the prior art still fails to effectively solve the problems of low battery capacity and poor rate performance caused by the poor conductivity of chromium oxides.

Method used

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  • Chromium oxide/CNTS composite material and preparation and application thereof
  • Chromium oxide/CNTS composite material and preparation and application thereof
  • Chromium oxide/CNTS composite material and preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The method for preparing chromium oxide / CNTS composite material by high-temperature solid phase method comprises the following steps:

[0042] (1) Take 10g of chromium trioxide (CrO 3 ) placed in a porcelain boat, vacuum-dried at 50°C for 5 hours, put into a tube furnace for sintering, and heated to 260°C at a rate of 1°C / min under the protection of an oxygen atmosphere with an oxygen flow rate of 20mL / min. Sinter for 24 hours, transfer to a ball mill, ball mill for 5 hours at 200r / min, then pass through a 200-mesh sieve to obtain chromium oxide;

[0043] (2) Stir and mix chromium oxide and CNTS at a mass ratio of 20:1, put them into a muffle furnace for calcination, and after calcination at 200°C for 2 hours, grind to powder and pass through a 200-mesh sieve to obtain chromium oxide / CNTS composites.

Embodiment 2

[0045] The method for preparing chromium oxide / CNTS composite material by high-temperature solid phase method comprises the following steps:

[0046] (1) with embodiment 1 step (1);

[0047] (2) Stir and mix chromium oxide and CNTS at a mass ratio of 20:3, put them into a muffle furnace for calcination, and after calcination at 200°C for 2 hours, grind to powder and pass through a 200-mesh sieve to obtain chromium oxide / CNTS composites.

Embodiment 3

[0049] The method for preparing chromium oxide / CNTS composite material by high-temperature solid phase method comprises the following steps:

[0050] (1) with embodiment 1 step (1);

[0051] (2) Stir and mix chromium oxide and CNTS at a mass ratio of 20:1, put them into a muffle furnace for calcination, and after calcination at 270°C for 2 hours, grind to powder and pass through a 200-mesh sieve to obtain chromium oxide / CNTS composites.

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Abstract

The invention belongs to the technical field of lithium primary battery positive electrode material preparation, and particularly relates to a chromium oxide / CNTS composite material and preparation and application thereof. The chromium oxide / CNTS composite material is prepared from chromium oxide and carbon nanotubes as raw materials through a high-temperature solid-phase method or a high-energy ball milling method. The CNTS with good conductivity is compounded with the chromium oxide, so that the conductivity of the obtained composite material is obviously improved, the capacity is increased, and the rate capability is improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of positive electrode materials of lithium primary batteries, and in particular relates to a chromium oxide / CNTS composite material and its preparation and application. Background technique [0002] Lithium primary batteries have the characteristics of high energy density, high working voltage, and long storage life, and have been extensively studied by researchers. Common cathode materials for lithium primary batteries, such as manganese dioxide, carbon fluoride, thionyl chloride, etc., each have some difficult problems to solve. Chromium oxide, as a new type of lithium primary battery cathode material, has a high discharge capacity and a high discharge voltage platform (>3.0V, vs Li + / Li), which has the advantages of no voltage hysteresis at low and medium rates, and is a promising cathode material. However, the poor conductivity of chromium oxide leads to low power density, poor high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/48H01M4/06H01M6/16
CPCH01M4/483H01M4/625H01M4/06H01M6/16H01M2004/028
Inventor 滕久康王庆杰张亮张红梅王储陈晓涛石斌文璞山
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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