Patent ID: 9595715
Date: 2017-03-14
CPC Classifications: H01M,Y02E

Claim:
1. A lithium ion secondary battery negative electrode material comprising: (1) a negative electrode active material comprising at least one iron oxide selected from the group consisting of amorphous iron oxides and ferrihydrite, the at least one iron oxide comprising iron and oxygen, and further comprising silicon and/or phosphorus, wherein (i) the at least one iron oxide comprising iron and silicon or phosphorous has an elemental ratio of iron to silicon or phosphorus of 60-99.9:40-0.1 by atomic percent, with the proviso that the total of iron and silicon or phosphorus by atomic percent is taken as 100, or (ii) the at least one iron oxide comprising iron, silicon and phosphorus has an elemental ratio of iron to silicon to phosphorus of 66-87:2-27:1-32 by atomic percent, with the proviso that the total of iron, silicon, and phosphorus by atomic percent is taken as 100; and (2) at least one of a conductive auxiliary agent and a binding agent.