DUCTILE POLYMER BINDERS AND BATTERY COMPONENTS USING THE SAME

• Main Authors: ABHIJIT GHOSH-DASTIDAR, MICHAEL M LUONG, RICHARD A GALLEY, BABINEC SUSAN J, TANG HOUXIANG, ERIC P WASSERMAN
• Format: Patent
• Language: English; Japanese
• Published: 31.03.2016
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

PROBLEM TO BE SOLVED: To provide ethylene oxide-containing copolymers as a binder material for a battery, the copolymers having a balance between high ethylene oxide concentration and low melting point, and having a strong adhesion to electroactive particles, even after undergoing mechanical deformation, such as the dynamic cyclical dimensional fluctuations caused during charge-discharge of a battery.SOLUTION: There is provided a composition comprising: a copolymer including ethylene oxide and propylene oxide; and a metal salt selected from alkali metal salts and alkaline earth metal salts. In the composition, the copolymer is a random copolymer which has a weight average molecular weight of less than about 200,000 g/mole, a polydispersity index (Mw/Mn) of less than 1.3, and the molar fraction of the ethylene oxide of 0.80 to 0.995 and in which a peak melting temperature (Tp°C) for XEO selected in the range of 0.80 to 0.995 is below a peak melting temperature Tpmax in XEO calculated using the equation Tpmax=(60-150(1-XEO)).SELECTED DRAWING: Figure 1A 【課題】電池用バインダー材料としてのエチレンオキシド含有ポリマー組成物において、高いエチレンオキシド濃度と低融点のバランスを有し、電池の充放電に伴う周期的寸法変動等による機械的変形を受けた後でも電気活性粒子に対する強い接着を有する、エチレンオキシド含有ポリマー組成物の提供。【解決手段】エチレンオキシド及びプロピレンオキシドを含むコポリマー、並びにアルカリ金属塩及びアルカリ土類金属塩から選択される金属塩を含む組成物であって、該コポリマーが重量平均分子量２００，０００ｇ／モル未満、多分散性指数（Ｍｗ／Ｍｎ）１．３未満であるランダムコポリマーであり、エチレンオキシドのモル分率（ＸＥＯ）が０．８０〜０．９９５であり、且つ、該範囲で選択されたＸＥＯについてのピーク融解温度（Ｔｐ℃）が、Ｔｐｍａｘ＝（６０−１５０（１−ＸＥＯ））で計算されるＸＥＯにおけるピーク融解温度Ｔｐｍａｘよりも低い、組成物。【選択図】図１Ａ