Murata Manufacturing Co., Ltd.

Sumitomo Seika Chemicals Co., Ltd.

Yusuke Ueba

Kiyoshi Nishioka

Manabu Sawada

Yosuke Tanaka

Akemi Kirihata

An object of this invention is to find a method for introducing a functional group into an aliphatic polycarbonate without impairing the excellent thermal decomposition property of the aliphatic polycarbonate. An aliphatic polycarbonate comprising a constituent unit represented by formula (1): wherein R, R, and Rare identical or different, and each represents a hydrogen atom, a Calkyl group optionally substituted with one or more substituents, or a Caryl group optionally substituted with one or more substituents, wherein two groups from among Rto R, taken together with the carbon atom or carbon atoms to which these groups are attached, may form a substituted or unsubstituted, saturated or unsaturated 3- to 10-membered aliphatic ring; and X represents a divalent group containing one or more heteroatoms or an alkylene group having 3 or more carbon atoms, anda constituent unit represented by formula (2): wherein R, R, R, and Rare identical or different, and each represents a hydrogen atom, a Calkyl group optionally substituted with one or more substituents, or a Caryl group optionally substituted with one or more substituents, wherein two groups from among Rto R, taken together with the carbon atom or carbon atoms to which these groups are attached, may form a substituted or unsubstituted, saturated or unsaturated 3- to 10-membered aliphatic ring,

Aliphatic polycarbonate

A lithium ion secondary battery that includes an electrode smoothing layer formed from a composite material including an active material and an organic substance and provided on the surface of at least one of a positive electrode and a negative electrode, and a lithium-ion permeable ceramic separator layer formed from a composite material including insulating inorganic microparticles and an organic substance provided so as to be opposed to at least one of the positive electrode and negative electrode with the electrode smoothing layer interposed therebetween.

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Nagaokakyo, Japan

Yusuke Ueba