ELECTRODE SLURRY, ELECTRODE AND PROCESS FOR PRODUCING THE SAME, AND SECONDARY BATTERY

An electrode slurry contains (A) a cellulose fiber and (C) an electrode active material, the electrode active material (C) contains at least a silicon particle and may contain a silicon particle and a carbonaceous particle. The slurry may further contain (B) a carboxymethyl-group-containing cellulose ether or a salt thereof. The average fiber length L (1 to 750 μm) of the cellulose fiber (A) is larger than the average particle size D(1 nm to 1 μm) of the silicon particle as the electrode active material (C). The average particle size ratio L/Dis 5 to 15000. The electrode slurry can improve a discharge capacity and is useful for forming an electrode of a non-aqueous secondary battery (lithium-ion secondary battery) that can maintain a high discharge capacity after repeated charging and discharging.