I/We Claim:
1. An electrode composite comprising:
a. an active material;
b. a conducting additive; and
5 c. a binder composition,
wherein the binder composition comprises (i) a copolymer with
hydroxyl group; and (ii) a fluoropolymer, in a weight ratio range of 1:3
to 3:1.
2. The electrode composite as claimed in claim 1, wherein the copolymer
10 with hydroxyl group is polyvinyl alcohol-polyethylene glycol
copolymer.
3. The electrode composite as claimed in claim 2, wherein the copolymer
comprises polyvinyl alcohol and polyethylene glycol in a weight ratio
range of 15:85 to 35:65, preferably in a weight ratio range of 20:80 to
15 30:70.
4. The electrode composite as claimed in claim 1, wherein the active
material is in a weight range of 95 to 98% with respect to the total weight
of the electrode composite; the conducting additive is in a weight range
of 1 to 5% with respect to the total weight of the electrode composite;
20 and the binder composition is in a weight range of 1 to 5% with respect
to the total weight of the electrode composite.
5. The electrode composite as claimed in claim 1, wherein the copolymer
with hydroxyl group is an alternating copolymer, a random copolymer,
a graft copolymer, or a block copolymer.
25 6. The electrode composite as claimed in claim 1, wherein the
fluoropolymer is selected from polytetrafluoroethylene (PTFE),
fluoroethylene vinyl ether (FEVE), fluorene ethylene propylene (FEP),
and or combinations thereof.
7. The electrode composite as claimed in claim 1, wherein the active
30 material is selected from silicon, silicon-based oxides, silicon-carbon
26
composites, silicon-hard carbon composites, silicon-carbon nanotube
based (CNT) composite, silicon-graphite composite, or combinations
thereof.
8. The electrode composite as claimed in claim 1, wherein the conducting
5 additive is selected from Super P, carbon nanotubes, KS6L, graphite,
amorphous carbon, graphene, graphene oxide, ketjen black, carbon
black, carbon fibres, or combinations thereof.
9. A process for preparing the electrode composite as claimed in claims 1
to 8, said process comprising the steps of:
10 a. mixing a copolymer with hydroxyl group and a fluoropolymer to
obtain a mixture; and
b. high shear mixing the mixture with an active material and a
conducting additive to obtain the electrode composite.
10. The process as claimed in claim 9, wherein the mixing is carried out at
15 a speed in a range of 500 to 1000 RPM and a temperature in a range of
30 to 50 °C.
11. The process as claimed in claim 9, wherein the high shear mixing is
carried out at a speed in a range of 2500 to 3500 RPM and a temperature
in a range of 50 to 80 °C.
20 12. The process as claimed in clam 9, wherein the electrode composite is
further subjected to processing to obtain an electrode film.
13. The process as claimed in claim 12, wherein the processing comprises
rolling, calendering, or combinations thereof.
14. The process as claimed in claim 12, wherein the electrode film is further
25 laminated on a current collector to obtain an electrode.
15. The process as claimed in claim 14, wherein the electrode is an anode.
16. An anode comprising the electrode composite as claimed in claim 1 and
an anodic current collector.
17. The anode as claimed in claim 16, wherein the anodic current collector
30 is a selected from copper, copper alloys, modified copper, perforated
27
copper, surface treated copper, surface modified copper, or
combinations thereof.
18. The anode as claimed in claim 16, wherein the anode exhibits a peel
strength in a range of 0.8 to 1 N/25mm, a charge capacity in a range of
5 600 to 610 mAh/g, a discharge capacity in a range of 540 to 550 mAh/g,
and initial coulombic efficiency in a range of 88 to 91%.
19. An electrochemical cell comprising:
a. a cathode;
b. an anode comprising the electrode composite as claimed in claims 1
10 to 8; and
c. an electrolyte.
20. The electrochemical cell as claimed in claim 19, wherein the
electrochemical cell further comprises a separator.
21. The electrochemical cell as claimed in claim 19, wherein the cathode is
15 selected from a group consisting of nickel-manganese-cobalt (NMC),
lithium-cobalt-oxide (LCO), nickel-cobalt-aluminium (NCA), lithium
manganese rich cathode (LMR), lithium iron phosphate (LFP), and
lithium manganese iron phosphate (LMFP).
22. The electrochemical cell as claimed in claim 19, wherein the electrolyte
20 is a solid, liquid or gel electrolyte.