US2023223515A1PendingUtilityA1

Porous carbon, and positive electrode and lithium secondary battery comprising same

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Assignee: LG ENERGY SOLUTION LTDPriority: Nov 8, 2017Filed: Mar 16, 2023Published: Jul 13, 2023
Est. expiryNov 8, 2037(~11.3 yrs left)· nominal 20-yr term from priority
Inventors:Dongwook LeeChangshin JoJinwoo LeeKwonnam SohnDoo Kyung YangWon-Gwang Lim
H01M 4/13C01B 32/05H01M 4/362H01M 4/36H01M 4/38H01M 4/62H01M 10/052H01M 4/139H01M 4/625H01M 2004/028C01B 32/00C01P 2006/14C01P 2006/16C01P 2006/12Y02E60/10C01P 2004/61C01P 2004/32C01P 2006/40C01P 2006/17H01M 10/0525H01M 2004/021H01M 4/133H01M 4/587
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Claims

Abstract

Porous carbon particles, and a positive electrode active material and a lithium secondary battery including the same. This may improve the energy density of the lithium secondary battery by applying a porous electrode containing micropores and mesopores and having a uniform size distribution and shape as a positive electrode material.

Claims

exact text as granted — not AI-modified
1 . Porous carbon particles comprising:
 porous carbon comprising micropores having a diameter of 1 nm to 8 nm and mesopores having a diameter of 2 nm to 50 nm,   wherein the porous carbon particles are spherical particles having a particle diameter of 2 μm to 10 μm,   wherein a pore volume of mesopores is 3.5 cm 3 /g or more; and   wherein the porous carbon comprises the micropores and the mesopores in a pore volume ratio of 1:20 to 70.   
     
     
         2 . The porous carbon particles according to  claim 1 , wherein the porous carbon particles are spherical particles having a particle diameter of 3 μm to 7 μm. 
     
     
         3 . The porous carbon particles according to  claim 1 , wherein the porous carbon particles are spherical particles having a particle diameter of 4 μm to 6 μm. 
     
     
         4 . The porous carbon particles according to  claim 1 , wherein the pore volume of the mesopores is 3.5 cm 3 /g to 4.5 cm 3 /g. 
     
     
         5 . The porous carbon particles according to  claim 1 , wherein the pore volume of the mesopores is 3.8 cm 3 /g to 4.2 cm 3 /g. 
     
     
         6 . The porous carbon particles according to  claim 1 , wherein a specific surface area of the porous carbon is 1000 m 2 /g to 1300 m 2 /g. 
     
     
         7 . The porous carbon particles according to  claim 1 , wherein a specific surface area of the porous carbon is 1150 m 2 /g to 1300 m 2 /g. 
     
     
         8 . The porous carbon particles according to  claim 1 , wherein a specific surface area of the porous carbon is 1200 m 2 /g to 1300 m 2 /g. 
     
     
         9 . The porous carbon particles according to  claim 1 , wherein the porous carbon comprises the micropores and the mesopores in a pore volume ratio of 1:30 to 60. 
     
     
         10 . The porous carbon particles according to  claim 1 , wherein the porous carbon particles comprise micropores having a diameter of 0.1 nm to 1.8 nm. 
     
     
         11 . The porous carbon particles according to  claim 1 , wherein the porous carbon particles comprise micropores having a diameter of 0.3 nm to 1.5 nm. 
     
     
         12 . The porous carbon particles according to  claim 1 , wherein the porous carbon particles comprise mesopores having a diameter of 10 nm to 50 nm. 
     
     
         13 . The porous carbon particles according to  claim 1 , wherein the porous carbon particles comprise mesopores having a diameter of 30 nm to 50 nm. 
     
     
         14 . The porous carbon particles according to  claim 1 , wherein the porous carbon particles comprise mesopores having a diameter of 20 nm to 40 nm. 
     
     
         15 . A positive electrode active material comprising: the porous carbon particles according to  claim 1 ; and a sulfur-containing material carried within pores of the porous carbon particles. 
     
     
         16 . The positive electrode active material according to  claim 15 , wherein the content of sulfur carried in the porous carbon particles is 50 wt. % to 80 wt. % based on a total weight of the positive electrode active material. 
     
     
         17 . A method for manufacturing a positive electrode active material comprising the steps of: (P1) forming a mixed powder of the porous carbon particles of  claim 1  and a sulfur-containing material; (P2) mixing the mixed powder with a solvent for dissolving sulfur to form a mixture; and (P3) subjecting the mixture to heat treatment under a vacuum to impregnate pores of the porous carbon with sulfur. 
     
     
         18 . The method for manufacturing the positive electrode active material according to  claim 15 , wherein the solvent for dissolving sulfur comprises at least one selected from the group consisting of CS 2 , ethylenediamine, acetone, and ethanol. 
     
     
         19 . A positive electrode for a lithium secondary battery comprising the positive electrode active material according to  claim 15 . 
     
     
         20 . A lithium secondary battery comprising the positive electrode according to  claim 19 .

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