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AssigneeHitachi, Ltd.
InventorsShin Nishimura, Akira Satou, Takefumi Okumura, Makoto Morishima, Hitoshi Yamamoto, Norikazu Ueyama
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The disclosure discloses a polymer represented by the general formula, 1 wherein Rp is a residue of a polymer of a compound having a polymerizable unsaturated bond, Q is an organic residue of n+1 valences and connected directly or through another group to Rp by means of a single bond, Mk+ is a cation of k valence, Z is an organic function group capable of forming an ionic bond with cation Mk+ or an organic function group having a coordination capability with Mk+, and m, n and k are integers of one or more. The disclosure also discloses an intermediate of the polymer mentioned above.
A polymer represented by the general formula,
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Backward citations are indexed for grants only.
Processes of polymerisation: polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
Organic substances: ionic conductors
Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation: energy storage using batteries
Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
Term end not estimated
1. Field of the Invention
The present invention relates to an ionic conductive organic electrolyte and a polymer electrolyte.
2. Prior Art
FIG. 1 shows a graph that shows relationship between ionic conductivity of the polymer electrolyte and temperatures.
FIG. 2 shows a sectional view of a lithium battery that uses the polymer electrolyte obtained in the procedure described later.
In the ionic conductive polymers that have been investigated heretofore, ion conductivity takes place jointly with molecular motion of the polymer. That is, functional groups having coordinating capability present in the polymer chain make coordination to lithium ions, whereby lithium ions can move to other coordination groups by transition along with motion of molecular chains. Therefore, the ionic conductivity depends on mobility of the molecular chains, and also depends on a motion necessary for conformation change of a main chain such as dihedral angle motion that needs large activation energy. When a temperature is low where the molecular motion is suppressed, ionic conductivity decreases at the same time.
The inventors have devised to employ as a mechanism for transferring ions by the rotation of a single bond in a molecular chain that has small activation energy and that does not depend on motion of a molecular chain. In a compound, an organic compound having functional groups that can become coordination groups or ligands to lithium ions are bonded to other organic groups, whereby the single bond can rotate freely over the wide range of temperature. Exchange of lithium ions between adjoining similar or analogous functional groups takes place by the action of the rotation. This phenomenon brings about ionic conductivity.
Another manner was devised by the inventors. The structure of organic groups having functional groups to be ligands of lithium ions that are connected by means of the single bond was provided with such functional groups as amide groups. The groups form hydrogen bonds having stable stereo structure with ligands, and the pKa of the functional groups to be ligands was changed to control coordination capability of lithium ions.