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Positive electrode active material as well as preparation method thereof, and all-solid-state lithium battery

A positive electrode active material and a positive electrode technology are applied in the field of positive electrode active material and its preparation, all-solid-state lithium battery, and can solve the problem of the decrease of ion conductivity of all-solid-state lithium battery, the reduction of reversibility of all-solid-state lithium battery, and the capacity attenuation of all-solid-state lithium battery. and other problems, to achieve the effect of improving the specific capacity and cycle stability of the battery, improving the cycle stability and specific capacity, and improving the cycle stability

Active Publication Date: 2019-02-15
SOUNDON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] But ferrous sulfide can have following technical problem in carrying out redox reaction process: one, there is volume expansion effect; Two, there is the Li generated in reaction process 2 S is easy to migrate to the negative electrode, leading to the problem of rapid decline in the capacity of the all-solid-state lithium battery, that is, there is a shuttle effect; 3. Li 2 S is an insulator, which will lead to a decrease in the ionic conductivity of the all-solid-state lithium battery; four, Li 2 S does not have electrochemical activity, which will reduce the reversibility of all-solid-state lithium batteries

Method used

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  • Positive electrode active material as well as preparation method thereof, and all-solid-state lithium battery
  • Positive electrode active material as well as preparation method thereof, and all-solid-state lithium battery

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preparation example Construction

[0040] According to the second aspect of the present invention, the present invention provides a method for preparing a positive electrode active material, including the following steps:

[0041] Mixing nano-ferrous sulfide and carbon-containing polymer to obtain nano-ferrous sulfide coated with carbon-containing polymer and sintering to obtain a positive electrode active material;

[0042] Wherein, the positive electrode active material includes nano-iron sulfide and a carbon layer coating the nano-iron sulfide.

[0043] The preparation method of the all-solid-state lithium battery cathode material provided by the present invention has simple process and convenient operation, can carry out industrialized large-scale production, improves production efficiency, and reduces preparation cost.

[0044] In a preferred embodiment of the present invention, the carbon-containing polymer includes, but is not limited to, one or more of polyvinylpyrrolidone, polyethylene glycol, polyacrylamide, a...

Embodiment 1

[0070] This embodiment provides an all-solid-state lithium battery cathode material, which includes nano-ferrous sulfide and a carbon layer coating the nano-iron sulfide, which is prepared according to the following steps:

[0071] (1) Place the commercial ferrous sulfide with a particle size of 10 microns or more in a zirconia ball milling tank under the protection of argon, and ball mill it at 700 rpm for 32 hours to obtain nano ferrous sulfide particles with a particle size of 100-500 nm ;

[0072] (2) Dissolve polyvinylpyrrolidone (PVP) in N,N dimethylformamide (DMF) and disperse uniformly, then add nano-ferrous sulfide particles, stir magnetically for 6 hours, and distill under reduced pressure to remove DMF to obtain PVP-coated nano The precursor particles of ferrous sulfide; among them, the mass ratio of nano-ferrous sulfide to PVP is 95:5;

[0073] (3) The precursor particles are heated at 400°C for 1 hour, and then sintered at 800°C for 1 hour to obtain a positive electrode...

Embodiment 2

[0075] This embodiment provides a positive electrode active material, including nano-ferrous sulfide and a carbon layer coating nano-ferrous sulfide. The preparation method is different from that in Example 1 in that in step (1), 10 micrometers The above ferrous sulfide is ball milled into nano-ferrous sulfide with a particle size of 50-300nm.

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Abstract

The invention provides a positive electrode active material as well as a preparation method thereof, and an all-solid-state lithium battery. The positive electrode active material comprises nano-ferrous sulfide and a carbon layer coating nano-ferrous sulfide. The positive electrode active material provided by the invention, firstly, inhibits the volume expansion of ferrous sulfide during a redox reaction; secondly, the active material suppresses a shuttle effect of Li2S generated during the reaction to migrate to a negative electrode; thirdly, Li2S is an insulator which causes the ionic conductivity of the all-solid-state lithium battery to decrease, however, after coating with the carbon layer, the ionic conductivity of the all-solid-state lithium battery is improved due to the relativelyhigh ionic conductivity of the carbon layer; and fourthly, Li2S has no electrochemical activity, and Li2S is further electrochemically active after nano-ferrous sulfide is coated with the carbon layer, the polarization is reduced, and the reversibility of the battery is enhanced, thereby improving the cycle stability and battery specific capacity of the all-solid-state lithium battery comprisingthe positive electrode active material.

Description

Technical field [0001] The invention relates to the technical field of batteries, in particular to a positive electrode active material and a preparation method thereof, and an all-solid-state lithium battery. Background technique [0002] Based on LiMO 2 (M=transition metal) The energy density of lithium-ion batteries with positive and graphite negative electrodes has reached the upper limit today. [0003] In order to increase the energy density of lithium-ion batteries and meet the needs of electric vehicles and large-scale energy storage, transition metal compounds have received more and more attention as cathode materials. For example, transition metal compounds such as oxides, sulfides and fluorides can provide multiple electrons during the oxidation-reduction reaction process, thereby enabling lithium-ion batteries to have higher capacity. [0004] Among these transition metal compounds, ferrous sulfide (FeS) is inexpensive, environmentally friendly, and theoretical capacity ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/052
CPCH01M4/366H01M4/5815H01M4/62H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 刘茜陈渊周美丽倪海芳
Owner SOUNDON NEW ENERGY TECH CO LTD
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