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Negative electrode material and preparation method thereof, negative electrode and all-solid-state lithium battery

A negative electrode material and negative active material technology, applied in the field of negative electrode and all-solid-state lithium battery, lithium ion battery negative electrode material and its preparation, can solve the problems of fragile silicon film and the decrease of electrochemical performance of silicon negative electrode material, and achieve good electronic performance. Effect of conductance and ionic conductance, good volume stability, good electrochemical performance and conductivity

Active Publication Date: 2022-01-25
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004]However, there are at least the following technical problems in the above-mentioned technologies: after the silicon negative electrode material is prepared into a silicon film, the silicon film is easily broken, and as the thickness of the silicon film increases, The electrochemical performance of silicon anode materials decreases accordingly

Method used

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  • Negative electrode material and preparation method thereof, negative electrode and all-solid-state lithium battery
  • Negative electrode material and preparation method thereof, negative electrode and all-solid-state lithium battery
  • Negative electrode material and preparation method thereof, negative electrode and all-solid-state lithium battery

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Embodiment 1

[0055] This example is used to illustrate the preparation process of the negative electrode material of the present disclosure. All manipulations were performed under inert gas (argon) conditions.

[0056] (1) 1424 parts by weight of the lithium-silicon alloy Li 1.71 Si, 20 parts by weight of nano-copper and 20 parts by weight of nano-zinc are mixed and placed in a ball mill for ball milling to obtain the first mixture, wherein the rotating speed of the ball mill is 150rpm, and the ball milling time is 20min, wherein the first mixture includes The first core and the first cladding layer clad on the surface of the first core, the first core is made of lithium silicon alloy Li 1.71 Si, the first cladding layer is composed of a mixture of nano-copper and nano-zinc.

[0057] (2) Heat the first mixture prepared in step (1) to 600° C. and continue heating for 2 hours to obtain a second mixture, wherein the second mixture includes a second inner core and a first inner core coated o...

Embodiment 2

[0062] Adopt the method for embodiment 1 to prepare negative electrode material B, the difference is that, the liquid alloy that adopts in the present embodiment is Ga 0.9 sn 0.05 Zn 0.05 .

Embodiment 3

[0064] Negative electrode material C was prepared by the method of Example 1, except that the amount of nano-zinc in step (1) was 10 parts by weight.

[0065] In the negative electrode material C prepared in this embodiment, the porosity of the porous copper is about 35%, and the pore diameter is about 15 nm.

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Abstract

The invention relates to a negative electrode material and a preparation method thereof, a negative electrode and an all-solid-state lithium battery, the negative electrode material comprises a negative electrode active material, a porous metal and a liquid alloy, the porous metal coats the surface of the negative electrode active material, and liquid alloy is uniformly distributed between the negative electrode active material and the porous metal, in pores of the porous metal and on the surface of the porous metal. In the negative electrode material, the porous metal is coated on the surface of the negative electrode active material, so that the volume change of the negative electrode active material can be effectively inhibited, and the negative electrode material has relatively good volume stability; and the liquid alloy has good electronic conductivity and ionic conductivity, and the liquid alloy is in good contact with the negative electrode active material and the porous metal, so that the negative electrode material has relatively good electrochemical performance and conductivity.

Description

technical field [0001] The present disclosure relates to the technical field of lithium-ion batteries, in particular, to a lithium-ion battery negative electrode material, a preparation method thereof, a negative electrode, and an all-solid lithium battery. Background technique [0002] Silicon is a lithium-ion battery anode material with a high specific capacity, and is widely used in the production of silicon anodes for all-solid-state lithium batteries to increase the energy density of all-solid-state lithium batteries. However, during the electrochemical cycle, the intercalation and extraction of lithium ions will cause the volume of silicon anode materials to expand and shrink by more than 300%, resulting in poor cycle performance of all-solid-state lithium batteries prepared using silicon anodes. [0003] In related technologies, a treatment method is to prepare the silicon negative electrode material into a silicon thin film negative electrode to alleviate the volume ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/38H01M4/134H01M10/0525B82Y30/00
CPCH01M4/382H01M4/386H01M4/628H01M4/626H01M4/134H01M10/0525B82Y30/00H01M2004/021H01M2004/027Y02E60/10
Inventor 历彪郭姿珠张桐
Owner BYD CO LTD
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