METHOD FOR PREPARING ANODE PASTE FOR LITHIUM-ION BATTERY, ANODE PASTE, METHOD FOR MANUFACTURE OF ANODE (VARIANTS), ANODE (VARIANTS) AND LITHIUM-ION BATTERY (VARIANTS) Russian patent published in 2021 - IPC C01B32/158 H01M4/02 H01M4/04 H01M4/13 

FIELD: electric elements.

SUBSTANCE: invention relates to a method for preparing anode paste for a lithium-ion battery the dry substance whereof comprises more than 50% wt. and less than 99.9% wt. of the active component constituting a phase of silicon or phases of silicon oxides, SiOx, wherein x is a positive number less than or equal to 2, or a combination of phases of silicon and silicon oxide SiOx with a total atomic ratio of oxygen:silicon in the composition of the anode material greater than 0 and less than 1.8, and comprises more than 0.1% wt. and less than 20% wt. carbon nanotubes, characterised by including a sequence of stages of (1) introducing a composition (K) containing a phase of silicon or phases of silicon oxide, SiOx, wherein x is a positive number less than or equal to 2, or a combination of these phases with a total atomic ratio of oxygen:silicon in the composition of said combination of phases greater than 0 and less than 1.8, into a suspension in the liquid phase (C) containing from 0.01% wt. to 5% wt. carbon nanotubes, wherein more than 5% wt. carbon nanotubes from the total content of carbon nanotubes in the suspension (C) are single-walled and/or double-walled and are combined into bundles with a length of more than 10 mcm and the mode of distribution of the number of carbon nanotube bundles in the suspension (C) by the hydrodynamic diameter is less than 500 nm, and (2) mixing the mixture of composition (K) in the suspension (C) until a homogeneous paste is obtained. The invention also relates to anode paste, a method for preparing an anode of a lithium-ion battery (variants), an anode, a lithium-ion battery.

EFFECT: initial specific capacity of the anode exceeding 500 mA∙h/g and preservation of more than 80% of the initial capacity by the anode and the lithium-ion battery for at least 500 charge-discharge cycles at charge and discharge currents of at least 1 C.

25 cl, 15 dwg, 1 tbl, 9 ex