US 11,916,237 B2
Non-aqueous electrolyte secondary battery
Takuya Iwamoto, Osaka (JP); Satoshi Nishitani, Osaka (JP); and Masaki Deguchi, Hyogo (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 16/975,797
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Feb. 13, 2019, PCT No. PCT/JP2019/004941
§ 371(c)(1), (2) Date Aug. 26, 2020,
PCT Pub. No. WO2019/167611, PCT Pub. Date Sep. 6, 2019.
Claims priority of application No. 2018-033754 (JP), filed on Feb. 27, 2018.
Prior Publication US 2020/0411869 A1, Dec. 31, 2020
Int. Cl. H01M 4/62 (2006.01); H01M 4/133 (2010.01); H01M 4/36 (2006.01); H01M 4/38 (2006.01); H01M 4/587 (2010.01); H01M 10/0525 (2010.01); H01M 10/0568 (2010.01); H01M 10/0569 (2010.01); H01M 4/02 (2006.01)
CPC H01M 4/622 (2013.01) [H01M 4/133 (2013.01); H01M 4/364 (2013.01); H01M 4/386 (2013.01); H01M 4/587 (2013.01); H01M 10/0525 (2013.01); H01M 10/0568 (2013.01); H01M 10/0569 (2013.01); H01M 2004/027 (2013.01); H01M 2300/0025 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A non-aqueous electrolyte secondary battery comprising a positive electrode, a negative electrode, and an electrolyte,
the negative electrode including a negative electrode active material capable of electrochemically absorbing and releasing lithium, and a binder;
the negative electrode active material including a Si-containing material and a carbon material;
the Si-containing material includes a composite material including a lithium silicate phase and silicon particles dispersed in the lithium silicate phase;
a ratio of the carbon material to a total of the Si-containing material and the carbon material is 70 mass % or more and 98 mass % or less;
the silicon particles dispersed in the lithium silicate phase have a crystallite size of 10 nm or more;
the binder including at least one cellulose compound selected from the group consisting of a carboxyalkyl cellulose and a salt thereof;
the electrolyte including a non-aqueous solvent, and a lithium salt dissolved in the non-aqueous solvent;
the lithium salt including lithium bis(fluorosulfonyl)imide: LFSI.