Negative electrode for secondary cell, negative plate for secondary cell, and secondary cell comprising the same

A negative electrode for a rechargeable battery comprising a negative electrode material and a binder, the binder comprising:

• a first binder component including styrene butadiene copolymer containing between 20 weight % and 70 weight % of styrene;
• and
• a second binder component including styrene butadiene copolymer containing at least 80 weight % but less than 100 weight % of styrene;
• wherein said binder bonds to a carbon material;
• and
• wherein said carbon material is a graphite material having a mean particle size between 5 and 30 μm.

A negative electrode for a rechargeable battery comprising

• a negative electrode material and a binder, the binder comprising:
• a first binder component including styrene butadiene copolymer containing between 20 weight % and 70 weight % of styrene;
• and
• a second binder component including styrene butadiene copolymer containing at least 80 weight % but less than 100 weight % of styrene;
• wherein said binder bonds to a carbon material;
• and
• wherein a ratio of said first binder component to said carbon material is between 0.3 parts and 4 parts to 100 parts carbon material by weight, and a further ratio of said second binder component to said carbon material is between 0.3 parts and 4 parts to 100 parts carbon material in weight.

A negative electrode sheet for a rechargeable battery, said negative electrode sheet having a collector coated with a film substantially comprising a carbon material and a binder, said binder comprising:

• a first binder component including styrene butadiene copolymer containing between 20 weight % and 70 weight % of styrene;
• and
• a second binder component including styrene butadiene copolymer containing at least 80 weight % but less than 100 weight % of styrene;
• wherein said collector is made of a copper foil.

A rechargeable battery comprising:

• a positive electrode containing a lithium containing transition metal oxide;
• a negative electrode whose collector is coated with a film substantially comprising
• a carbon material, and
• a binder, said binder comprising:
• a first binder component including styrene butadiene copolymer containing of between 20 weight % and 70 weight % of styrene;
• and
• a second binder component including styrene butadiene copolymer containing at least 80 weight % but less than 100 weight % of styrene;
• a separator interposed between said positive electrode and said negative electrode;
• and
• a non-aqueous electrolyte.