TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The alkali-metal containing base or ammonium-group containing base is chosen from lithium hydroxide, sodium hydroxide, potassium hydroxide and ammonium hydroxide.    TECHNOLOGY FOCUS - POLYMERS - Preparation (Claimed): The polymer is obtained by mixing an alkali-metal containing base or an ammonium-group containing base and water, and reacting at 20-100 degrees C. Preferred Composition: The repeating unit (A) (I) is of formulae (II), (III), (VII), (VIII), (X) or (XI). The polymer further comprises repeating unit (B) of formula (IV), (IX) or (XII), repeating unit (C) of formulae (V), (VI), (XIII) or (IV). The repeating unit (B) (IV) is chosen from bivalent aliphatic organic group repeating unit and bivalent alicyclic organic group repeating unit. The bivalent aliphatic organic group repeating unit is optionally substituted 1-30C alkylene group or optionally substituted 2-30C alkynylene group. The bivalent alicyclic organic group repeating unit is optionally substituted 3-30C cycloalkylene group. The polymer is of formulae (XV) or (XVI). The content of lithium in the polymer is 2-15 wt.%. The content of polymer in the electrode is 1-30 pts. wt. with respect to 100 pts. wt. electrode active materials. The molar fraction of repeating unit (A) and repeating unit (B) is each 0.01-0.99.R1-R6=R;Y1,Y2=Y';R3+R4+R5=ring chosen from 6-10C cycloalkyl, 3-10C heteroaryl, 3-10C heteroaryl, 3-10C heterocyclyl or 3-10C heterocyclyl;R1,R2,R7-R12=H or 1-10C alkyl;Y3-Y6=H, Li, Na, K or NH4;Y7,Y8=H or Li;a=0 or 0.01-0.99, preferably 0;b=1 or 0.01-0.99, preferably 1;or a+b=1;m,n=0.01-0.99;andor m+n=1.(i) When Y3 and Y4 is hydrogen, then Y3 and Y4 are excluded. Preferred Properties: The polymer has polymeric polymerization degree of 100-50000. The substitution degree of polymeric alkali metal or ammonium group is 0.2-1. The polymeric weight average molecular weight of polymer is 50000-500000. EXAMPLE - 4 g Poly (isobutylene-alt-maleic acid anhydride) and 0.996 g lithium hydroxide were added to 96 g deionized water and mixed. A polymer composition comprising poly((isobutylene-alt-maleic acid anhydride)-co-(isobutylene-alt-maleic acid lithium salt)) and deionized water was stirred at 70 degrees C for 24 hours. The obtained polymer composition was filtered, and the component which was not dissolved in water was removed. Water was removed from the filtered solid, dried at 80 degrees C, and polymer (XV) having weight average molecular weight of 300000-350000 was obtained.