Sustainable technology company Johnson Matthey has completed its acquisition of battery materials business Clarinet, as of 28 February.The transaction was first announced on 29 October 2014 and totalled $75m.Chief executive Robert MacLeod commented: "The further strengthening of our battery technologies capability is a key milestone in the development of our New Businesses Division."It marks an important step in Johnson Matthey's long-term strategy to establish new businesses in adjacent markets with strong growth potential that align with our technology competences."