1. A cathode active material composite comprising:
a. a lithium-manganese oxide;
b. an active carbon source; and
5 c. a solid oxide,
wherein the active carbon source is dispersed in the solid oxide and the
lithium-manganese oxide is coated with the solid oxide.
2. The composite as claimed in claim 1, wherein the lithium-manganese oxide
is of formula LiNixMnyCozO2, wherein x = 0.5 to 1, y = 0.01 to 0.05, and z = 0.01
10 to 0.05.
3. The composite as claimed in claim 1, wherein the solid oxide is selected
from Li6.4La3Zr1.4Ta0.6O12 (LLZTO), Li7La3Zr2O12 (LLZO), Lithium aluminum
titanium phosphate (LATP), LiZr2(PO4)3, LiTi2(PO4)3, LiGe2(PO4)3, or
combinations thereof.
15 4. The composite as claimed in claim 1, wherein the active carbon source is
selected from activated carbon, single-wall carbon nanotube, multi-wall carbon
nanotube, graphene, super P, glucose, fructose, mesocarbon microbeads, sucrose,
or combinations thereof.
5. The composite as claimed in claim 1, wherein the lithium-manganese oxide
20 is in a weight range of 80 to 95% with respect to the total weight of the cathode
active material composite; the active carbon source is in a weight range of 1 to 5%
with respect to the total weight of the cathode active material composite; and the
solid oxide is in a weight range of 1 to 5 % with respect to the total weight of the
cathode active material composite.
25 6. The composite as claimed in claim 1, wherein the composite has particle
size in a range of 10 to 14 µm; and a pore size in a range of 10 to 60 nm.
7. A cathode comprising:
a. the cathode active material composite as claimed in claim 1;
b. at least one binder; and
30 c. a current collector,
26
wherein the cathode active material composite and binder are coated on
the current collector.
8. The cathode as claimed in claim 7, wherein the at least one binder is selected
from polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polyacrylic
5 acid (PAA), carboxymethyl cellulose (CMC), sodium alginate (SA), polyethylene
oxide (PEO), or combinations thereof; and the binder is in a weight range of 1 to
5% with respect to the total weight of the cathode active material composite.
9. A process of preparing the cathode active material composite as claimed in
claim 1, the process comprising:
10 i. mixing stoichiometric amounts of precursors of lithium-manganese oxide,
with an active carbon source in a solvent to obtain a first composite; and
ii. adding a solid oxide to the first composite and calcining to obtain the
cathode active material composite.
10. The process as claimed in claim 9, wherein the first composite before
15 calcining is heated at a temperature in a range of 80 to 120℃.
11. The process as claimed in claim 9, wherein calcining is carried out at a
temperature in a range of 400 to 800℃.
12. The process as claimed in claim 9, wherein precursors are selected from
lithium carbonate, lithium hydroxide, lithium acetate, manganese sulfate,
20 manganese acetate, manganese nitrate, manganese oxide, manganese chloride,
manganese oxalate, cobalt sulfate, cobalt acetate, cobalt nitrate, cobalt oxide, cobalt
chloride, cobalt oxalate, nickel sulfate, nickel acetate, nickel nitrate, nickel oxide,
nickel chloride, nickel oxalate, or combinations thereof.
13. The process as claimed in claim 9, wherein the solvent is selected from
25 ethanol, water, ammonium hydroxide, isopropanol, acetic acid, methanol, or
combinations thereof.
14. An electrochemical cell comprising:
a. the cathode as claimed in claim 7;
b. an anode; and
30 c. an electrolyte.