Negative electrode and method for preparing negative electrode

A method for preparing a negative electrode comprising:

• preparing a negative electrode slurry (step 1);
• and
• coating the negative electrode slurry on a current collector and then drying the result (step 2),
• wherein the negative electrode slurry includes first particles, second particles, and third particles,
• each first particle comprises a first core including artificial graphite;
• and a first shell disposed on the first core, said first shell including an oxide of the artificial graphite, a sphericity of each first particle measured through a particle shape analyzer is from 0.94 to 0.98,
• each second particle is artificial graphite having a sphericity measured through the particle shape analyzer of 0.70 to 0.92,
• each third particle comprises a second core including natural graphite;
• and a second shell disposed on the second core, said second shell including an oxide of the natural graphite, and each third particle having a sphericity measured through the particle shape analyzer from 0.94 to 0.98, and
• a weight ratio of first particles to second particles is from 1:1 to 1:9.