Back to results
US 6,589,696 B2Granted
Negative active material for rechargeable lithium battery and method of preparing same
AssigneeSamsung SDI Co., Ltd.
InventorsKeiko Matsubara, Toshiaki Tsuno, Sang-Young Yoon
Life of this patent
Estimating the term…
Abstract
Disclosed is a negative active material for a rechargeable lithium battery that includes graphite particles, silicon micro-particles attached on the graphite particles and a carbon film partially or totally coated on the graphite particles.
Claims16
A negative active material for a rechargeable lithium battery comprising:
- at least one graphite particle;
- at least one silicon micro-particle attached on a surface of the graphite particle;
- and
- an amorphous carbon film coated on the graphite particle and the silicon micro-particle.
1 more element
A negative active material for a rechargeable lithium battery comprising:
- at least one graphite particle;
- at least one silicon micro-particle attached on a surface of the graphite particle;
- and
- a carbon film coated on the graphite particle and the silicon micro-particle, wherein the content of the at least one silicon micro-particle is from 3 to 10 percent by weight, based on the total weight of the negative active material.
1 more element
A negative active material comprising:
- a core comprising one or more graphite particles and one or more silicon micro-particles;
- and
- an amorphous carbon film coated on the core.
A negative active material comprising:
- a core comprising one or more graphite particles and silicon micro-particles;
- and
- a carbon film coated on the core, wherein the content of one or more silicon micro-particles is from 3 to 10 percent by weight.
A method of preparing a negative active material comprising:
- attaching a silicon micro-particle to a graphite particle;
- coating a polymer film on the graphite particle to prepare a negative active material precursor;
- and
- calcinating the negative active material precursor such that the polymer film is carbonized to obtain a carbon film.
1 more element
Dependencies are inferred from the claim text.