Method of Manufacturing a Positive Electrode for a Nonaqueous Secondary Battery Using Graphene Oxide

Hiroatsu TODORIKI

Patent

Atlas literature

Patent

US 9,293,770

Method of Manufacturing a Positive Electrode for a Nonaqueous Secondary Battery Using Graphene Oxide

Hiroatsu TODORIKI

Drawings

Patent drawings and their descriptions. Click a drawing to enlarge it.

FIG. 1

FIGS. 1 0 A and 1 0B can have a 45 function of displaying a variety of kinds of data (e.g., a still image, a moving image, and a text image), a function of …

FIG. 2

FIGS. 2A and 2B each illustrate a dispersion state in a polar solvent;

FIG. 3

process tool top view

FIGS. 3B and 3C are schematic views illustrating a top view and a longitudinal section, respectively, of the positive electrode active material layer 202. The …

FIG. 4

FIG. 4. The method is as follows: a positive electrode paste is formed using the positive electrode active 23 material, the conductive additive, the binding …

FIG. 5

FIGS. 5A and 5 B illustrate a coin-type secondary battery;

FIG. 6

FIGS. 6A and 6B illustrate an electrophoresis method and an electrochemical 13 reduction method, respectively; FIG 7 illustrates a laminated secondary battery;

FIG. 7

FIG. 8

FIGS. 8A and 8B. As illustrated in FIG 8A, a cylindrical lithium secondary battery 600 includes a positive electrode cap (battery lid) 601 on its top surface …

FIG. 9

FIG. 10

FIGS. 10A to 1 0 C as long as the nonaqueous secondary battery described in any of the above embodiments is included. [0179] (Embodiment 6) Further, an example …

FIG. 11

FIG. 12

FIG. 12 shows charge-discharge characteristics, in which the horizontal axis represents discharge capacity (mAh/g) and the vertical axis represents voltage …

FIG. 13

FIGS. 13A and 13B. FIG 13A shows the measurement results of the charge-discharge characteristics of the cell A including the positive electrode of the sample A …

FIG. 14

FIGS. 14A and 14B are SEM images of a positive electrode active material layer using a graphene oxide as a raw material of a conductive additive; FIG 15 is a …

FIG. 15

FIG. 16

FIGS. 16A and 16 B, PVDF (1100) produced by Kureha Corporation was used. In the positive electrode material layer in FIG 21, PVDF (9100) produced by Kureha …

FIG. 17

FIGS. 17A and 17B show SEM observation results of the surface of the positive electrode active material layer using the RGO as a conductive additive. In FIG …

FIG. 18

FIGS. 18A and 18B show SEM observation results of the surface of the positive electrode active material layer using the graphene as a conductive additive. In …

FIG. 19

FIG. 20

FIGS. 20A and 20B are SEM images of a positive electrode active material layer using a graphene oxide as a raw material of a conductive additive; FIG 21 is a …

Claims

Claims define the patent's legal scope. Independent claims stand alone; dependent claims (nested) narrow them. Click a claim to expand its dependents.

2 independent · 3 dependent

11
Independentgraphene oxidegrapheneactive materialbinding agentpositive electrode for nonaqueous secondary battery
1 1. A method of manufacturing a positive electrode for a nonaqu e ous secondary battery, comprising: forming a paste including a dispersion medium, a plurality of active materials, a plurality of graphene oxides and a binding agent, wherein a weight an atomic ratio of oxygen to carbon in the plurality of graphene oxides is 0.405 or more; applying the paste on a current collector; and reducing the plurality of graphene oxides after or at the same time when the dispersion medium included in the applied paste is volatilized, whereby an active material layer comprising a plurality of graphenes is formed over the current collector.
1. 12
  Dependent← claim 11graphene oxidegrapheneactive materialbinding agentpositive electrode for nonaqueous secondary battery
  The method of manufacturing a positive electrode for a nonaqu e ous secondary battery according to claim 11, wherein the paste is manufactured by the following steps: dispersing the plurality of graphene oxides into the dispersion medium, adding the plurality of active materials to the dispersion medium into which the plurality of graphene oxides are dispersed and performing mixing to form a mixture; and adding the binding agent to the mixture and performing mixing.
2. 13
  Dependent← claim 11graphene oxide
  The method of manufacturing a positive electrode for a nonaqu e ous secondary battery according to claim 11, wherein the plurality of graphene oxides comprise one or more groups selected from an epoxy group, a carbonyl group, a carboxyl group, and a hydroxyl group.
3. 14
  Dependent← claim 11LiFePO₄
  The method of manufacturing a positive electrode for a nonaqueous secondary battery according to claim 11, wherein the plurality of active materials are lithium iron phosphate.
481
Independent
2-8784-1577 1 Attorney Docket No. 740756-3890 Application No. 13/826,710 Page 9 of 13

Device structures

Layer stacks claimed or described, ordered top of device to substrate.

positive electrode for nonaqueous secondary battery

grapheneactive material layer with graphene conductive additive

current collectorcurrent collector

Materials

Materials described outside the worked examples.

graphene oxide

Conductive Additive Precursor

graphene

Conductive Additive (Reduced From Graphene Oxide)

Process steps

Additional fabrication and treatment steps described in the patent.

Electrode Paste Formation And Reduction

Step 1

Process details

steps:dispersing graphene oxides (O/C atomic ratio >= 0.405) into a dispersion medium, adding active materials and mixing to form a mixture, adding binding agent and mixing to form paste, applying paste on a current collector, volatilizing dispersion medium and reducing graphene oxides (simultaneously or after volatilization) to form graphene active material layer

Materials:graphene oxide

Characterization

Measurements and analyses referenced in the patent, with their drawing references.

sem

SEM

FIGS. 1 0 A and 1 0B can have a 45 function of displaying a variety of kinds of data (e.g., a still image, a moving image, and a text image), a function of …

Figure references

FIG. 1

graphenegraphene

Reported properties

Performance values and ranges asserted in the specification or claims.

Property	Value	Material
atomic ratio of oxygen to carbon in graphene oxide	≥ 0.405 dimensionless (O/C atomic ratio)	graphene oxide
oxygen proportion in graphene after reduction	2–20 atomic%

Tables

Table 1
The measurements gave results shown in the following Table 1.
p. 31
Table 2
The measurement results were shown in Table 2 and Table 3.
p. 33
Table 3
The measurement results were shown in Table 2 and Table 3.
p. 34
Table 4
64 As shown in Table 4 and Table 5, while the C=C bond was not measured in the pos
p. 39
Table 5

Why these are connected

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Method of Manufacturing a Positive Electrode for a Nonaqueous Secondary Battery Using Graphene Oxide | Matter42 Literature