Titles:
Method for preparing silicon anode material for low expansion lithium ion battery
种低膨胀锂离子电池用硅负极材料的制备方法
Abstracts:
The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing a silicon anode material for a low-expansion lithium ion battery, which comprises the steps of: preparing a silicon slurry by dispersing nano silicon powder in ultrapure water; Silica sol is prepared by adding benzenediol, formaldehyde and sodium carbonate to the silicon slurry; silicon gel is obtained into silicon gel; silicon gel is aged and carbonized to obtain carbonized material; carbonized material is pulverized and classified to obtain silicon carbon composite material A The mesophase pitch is used to impregnate the silicon carbon composite material A, and the surface is coated with the coating material B; the coating material B is carbonized and sieved to obtain a silicon anode material for a low expansion lithium ion battery. Compared with the prior art, the nano-silicon coating is uniform; the carbon gel skeleton formed after carbonization has excellent buffering property for volume expansion generated when lithium silicon is deintercalated with lithium; the coating of mesophase asphalt can regulate carbon The pores of the gel skeleton keep the final silicon carbon material low rebound and overall structural stability.
Title:
ANODE ELECTRODE COMPOSITION OF LI-ION BATTERY CELL
Abstract:
In an embodiment, a Li-ion battery cell comprises an anode electrode with an electrode coating that (1) comprises Si-comprising active material particles, (2) exhibits an areal capacity loading in the range of about 3 mAh/cm2 to about 12 mAh/cm2, (3) exhibits a volumetric capacity in the range from about 600 mAh/cc to about 1800 mAh/cc in a charged state of the cell, (4) comprises conductive additive material particles, and (5) comprises a polymer binder that is configured to bind the Si-comprising active material particles and the conductive additive material particles together to stabilize the anode electrode against volume expansion during the one or more charge-discharge cycles of the battery cell while maintaining the electrical connection between the metal current collector and the Si-comprising active material particles.
Applicant:
SILA NANOTECHNOLOGIES INC [US]
Inventors:
YUSHIN GLEB [US]
GERBER LAURA [US]
KAJDOS ADAM [US]
YEN JUSTIN [US]
DOANE JUSTIN [US]
STEIGER JENS [US]
Other family members:
WO 2019079652 A1,
Pub. Date: 2019-04-25,
EPO Reference
